CN119009196A

CN119009196A - Lithium cobalt oxide battery, preparation method thereof and electric equipment

Info

Publication number: CN119009196A
Application number: CN202411488333.3A
Authority: CN
Inventors: 陈浩; 钟北军; 谭潮溥
Original assignee: BYD Co Ltd; Shanghai BYD Co Ltd
Current assignee: BYD Co Ltd; Shanghai BYD Co Ltd
Priority date: 2024-10-24
Filing date: 2024-10-24
Publication date: 2024-11-22
Anticipated expiration: 2044-10-24
Also published as: CN119009196B

Abstract

The application relates to the technical field of batteries, and discloses a lithium cobalt oxide battery, a preparation method thereof and electric equipment, wherein the method for preparing the lithium cobalt oxide battery comprises the following steps: charging and aging the lithium cobaltate battery after formation in sequence; the electric quantity of the lithium cobaltate battery obtained through the charging treatment is 70-100% of SOC; the temperature of the aging treatment is 40-60 ℃. The lithium cobaltate battery prepared by the method has strong stability under high-temperature and high-humidity environment, little capacity loss and long service life. The preparation method provided by the application has the advantages of strong operability, simplicity, practicability and low cost, and is suitable for industrial production.

Description

Lithium cobalt oxide battery, preparation method thereof and electric equipment

Technical Field

The application relates to the technical field of batteries, in particular to a lithium cobaltate battery, a preparation method thereof and electric equipment.

Background

The battery is a device for converting chemical energy into electric energy and is widely applied to various fields such as mobile phones, digital cameras, notebooks, electric bicycles, electric automobiles and the like. As application scenes increase, performance of the battery capable of being continuously used in a severe environment becomes more important, for example, capacity degradation of the battery is easily caused by a storage environment with high temperature and high humidity in actual working conditions, so that battery performance is deteriorated.

Disclosure of Invention

The present application aims to solve at least one of the technical problems in the related art to some extent. Therefore, the application aims to provide a lithium cobalt oxide battery, a preparation method thereof and electric equipment, and the lithium cobalt oxide battery prepared by the method has strong stability in a high-temperature high-humidity environment, less capacity loss and long service life. The method has strong operability, simplicity, practicability and low cost, and is suitable for industrial production.

The first aspect of the application provides a method for preparing a lithium cobaltate battery. According to an embodiment of the application, the method comprises: charging and aging the lithium cobaltate battery after formation in sequence;

the electric quantity of the lithium cobaltate battery obtained through the charging treatment is 70-100% of SOC;

The temperature of the aging treatment is 40-60 ℃.

According to the method provided by the embodiment of the application, the lithium cobaltate battery after formation is charged to a high-voltage state, and then is subjected to aging treatment, and under the aging treatment condition of high temperature and high pressure, the film forming additive in the electrolyte is subjected to oxidative decomposition, so that a stable CEI film is formed on the surface of the positive electrode plate. The high temperature environment promotes the rapid aging molding of the CEI film, thereby enhancing the interface stability between the positive electrode plate and the electrolyte and reducing the situation that active lithium loses activity due to being captured by the CEI film under the high temperature and high humidity storage condition. Therefore, the attenuation of the battery capacity is reduced, and the service life of the battery is prolonged.

According to the embodiment of the application, the method for preparing the lithium cobaltate battery can also have the following additional technical characteristics:

according to the embodiment of the application, the temperature of the aging treatment is 40-50 ℃.

According to the embodiment of the application, the aging treatment time is 6-48 hours.

According to the embodiment of the application, the aging treatment time is 20-28 hours.

According to the embodiment of the application, the charging current of the charging treatment is 0.5-0.8 ℃.

According to an embodiment of the application, the method further comprises: and discharging the aged lithium cobaltate battery to 0-70% of SOC.

According to an embodiment of the application, the method further comprises: discharging the aged lithium cobaltate battery to 40-60% SOC;

and/or the environmental temperature of the discharge is 20-30 ℃.

According to the embodiment of the application, before the charging treatment is performed, the lithium cobaltate battery after the formation is subjected to air exhaust and sealing of a liquid injection port.

According to an embodiment of the application, the lithium cobaltate battery comprises an electrolyte comprising a film forming additive.

The second aspect of the application provides a lithium cobaltate battery. According to an embodiment of the application, the lithium cobaltate battery is obtained by the method for preparing a lithium cobaltate battery according to the first aspect of the application.

A third aspect of the present application provides a powered device. According to an embodiment of the present application, the electric device comprises a lithium cobalt oxide battery according to the second aspect of the present application.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

The foregoing and/or additional aspects and advantages of the application will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 shows a schematic flow chart of a method for preparing a lithium cobaltate battery according to an embodiment of the application.

Detailed Description

Embodiments of the present application are described in detail below. The following examples are illustrative only and are not to be construed as limiting the application.

It should be noted that the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying a number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. Further, in the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

The endpoints of the ranges and any values disclosed in the present application are not limited to the precise range or value, and the range or value should be understood to include values close to the range or value. For numerical ranges, one or more new numerical ranges may be obtained in combination with each other between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point values, and are to be considered as specifically disclosed in the present application.

In the present application, the terms "comprising" or "including" are used in an open-ended fashion, i.e., to include what is indicated by the present application, but not to exclude other aspects.

As application scenes increase, performance of the battery capable of being continuously used in a severe environment is increasingly important, for example, capacity degradation of the battery is easily caused by a storage environment with high temperature and high humidity in actual working conditions, so that battery performance is deteriorated. Specifically, when a battery is placed in a high-temperature and high-humidity environment, the following chemical reactions mainly occur inside the battery: (1) thermal decomposition reaction of the positive electrode material; (2) oxidizing the electrolyte in the positive electrode; (3) reduction reaction of the electrolyte at the negative electrode; (4) thermal decomposition reaction of the electrolyte; (5) electrolytic water reaction.

According to the application, the lithium cobaltate battery after formation is subjected to aging treatment under the conditions of high pressure and high temperature, the pole piece is subjected to accelerated polarization expansion, the electrolyte fully infiltrates the pole piece interface, the film forming additive component in the solution is subjected to oxidative decomposition in preference to the solvent, a CEI film can be formed on the surface of the positive pole piece, and meanwhile, the rapid aging forming of the CEI film is promoted under the high temperature environment, so that the interface stability between the positive pole piece and the electrolyte is enhanced, and the condition that active lithium is lost due to capture by the CEI film under the high temperature and high humidity storage condition is effectively reduced. Therefore, the attenuation of the battery capacity is reduced, and the service life of the battery is prolonged.

Based on this, in a first aspect of the application a method for preparing a lithium cobaltate battery is presented. Fig. 1 shows a schematic flow diagram of a method of preparing a battery according to the present application, the method comprising: the charging process at S100 and the aging process at S200 will be described in detail below.

S100 charging process

In this step, the lithium cobaltate battery after the formation is subjected to a charging process. Therefore, the battery can be in a high-voltage state, and a stable CEI film is formed conveniently in subsequent aging treatment.

According to the embodiment of the application, the electric quantity of the lithium cobaltate battery obtained through the charging process is 70% SOC-100% SOC, and can be, for example, 70% SOC, 80% SOC, 85% SOC, 90% SOC, 95% SOC, 100% SOC and the like. The battery is charged to the state of charge (SOC), so that the battery is in a high-voltage state, the polarization expansion degree of the electrode material is increased, the electrolyte is easier to fully infiltrate the surface of the electrode material, more reaction sites are provided, the film forming additive can be subjected to oxidative decomposition in preference to the solvent, and a stable CEI film is formed on the surface of the high-voltage positive electrode plate by the product.

In the present application, the term "charging process" refers to a process method including a charging step, and may further include a discharging step during the charging process. In the charging process, the lithium cobaltate battery after formation can be directly charged to the target electric quantity, or can be charged to 100% of the SOC first and then discharged to the target electric quantity, the discharging current is 0.4-0.6C, and the corresponding target electric quantity is achieved by adjusting the discharging time.

According to the embodiment of the application, the charging current of the charging treatment is 0.5 to 0.8C, for example, may be 0.5C, 0.6C, 0.7C, 0.8C, etc. Therefore, the quick charge can be realized, and the loss of electrode plate materials and electrolyte and the heat generation can be reduced.

According to an embodiment of the present application, the lithium cobaltate battery includes: an electrolyte comprising a film forming additive. During the charge and discharge of the battery, the film-forming additive may chemically react at the electrode surface to form a protective Solid Electrolyte Interface (SEI) or positive electrode electrolyte interface (CEI) film. The membrane can improve the interface stability between the electrode and the electrolyte, reduce the decomposition of the electrolyte and the irreversible loss of active lithium, thereby prolonging the cycle life of the battery, improving the performance and the safety of the battery in extreme environment, reducing the capacity attenuation and ensuring the long-term stable operation of the battery.

The kind of the film forming additive is not critical to the present application, and may be any film forming additive commonly used in the art, and illustratively the film forming additive includes at least one of succinonitrile, carbonate, ethylene vinylene carbonate, vinyl carbonate, fluoroethylene carbonate, vinyl ethyl carbonate, ethylene carbonate, ethyl acrylate, vinyl alkyl carbonate, 1, 3-propane sultone, propylene carbonate sultone, diethylene glycol sulfate, dimethoxysulfonyl ethane, vinyl sultone, diphenyl disulfide, tetramethyl disulfide, ethylene carbonate sultone, and styrene carbonate sultone. Thereby, it is helpful to form more stable CEI films and SEI films. Wherein Succinonitrile (SN) reacts with the surface of the metal oxide to form a stable and low-impedance CEI film, and the electrolyte is restrained from directly contacting the anode.

According to an embodiment of the present application, the positive electrode tab includes a positive electrode current collector and a positive electrode active material layer disposed on at least one side surface of the positive electrode current collector, the positive electrode active material layer including lithium cobaltate. The positive electrode current collector may include a metal foil or a composite positive electrode current collector. For example, aluminum foil may be used as the metal foil. The composite positive electrode current collector may include a polymer material base layer and a metal layer formed on at least one side surface of the polymer material base layer, for example, the composite negative electrode current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel alloy, etc.) on a polymer material base material such as a base material of polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), etc.

According to an embodiment of the present application, the positive electrode active material layer may further optionally include a conductive agent. As an example, the conductive agent may include at least one of superconducting carbon, acetylene black, carbon black, ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers.

According to an embodiment of the present application, the positive electrode active material layer may further optionally include a binder. As an example, the binder may include at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), a vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, a vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, a tetrafluoroethylene-hexafluoropropylene copolymer, and a fluoroacrylate resin.

According to an embodiment of the present application, the positive electrode sheet may be prepared by: dispersing the components for preparing the positive electrode plate, such as the positive electrode active material, the conductive agent and the binder, in a solvent (such as N-methyl pyrrolidone) to form positive electrode slurry; and (3) coating the positive electrode slurry on a positive electrode current collector, and obtaining a positive electrode plate after the procedures of drying, cold pressing and the like.

According to an embodiment of the present application, the lithium cobaltate battery further includes a negative electrode tab including a negative electrode active material layer and a negative electrode current collector, the negative electrode active material layer being disposed on at least one side surface of the negative electrode current collector.

According to an embodiment of the present application, the anode active material layer includes at least one of graphite, artificial graphite, a silicon-based material, and a tin-based material.

According to an embodiment of the present application, the anode active material layer includes mesophase carbon microbeads. Mesophase Carbon Microbeads (MCMB) are a carbon-coated lithium metal oxide, typically a composite material of LiCoO ₂ mixed with a graphite material, which provides better electrical conductivity and structural stability. The stability of the composite material is better under the high-temperature and high-humidity environment.

According to an embodiment of the present application, the anode active material layer may further optionally include a binder. The binder may include at least one of Styrene Butadiene Rubber (SBR), polyacrylic acid (PAA), sodium Polyacrylate (PAAs), polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium Alginate (SA), polymethacrylic acid (PMAA), and carboxymethyl chitosan (CMCS).

According to an embodiment of the present application, the anode active material layer may further optionally include a conductive agent. The conductive agent may include at least one of superconducting carbon, acetylene black, carbon black, ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers.

According to an embodiment of the present application, the negative electrode current collector may employ a metal foil or a composite current collector. For example, as the metal foil, copper foil may be used. The composite current collector may include a polymeric material base layer and a metal layer formed on at least one surface of the polymeric material base material. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel alloy, etc.) on a polymer material substrate such as a substrate of polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), etc.

According to an embodiment of the application, the lithium cobaltate battery further comprises a separator between the positive pole piece and the negative pole piece. The type of the separator is not particularly limited, and any known porous separator having good chemical stability and mechanical stability can be used. According to an embodiment of the present application, the material of the isolation film may include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, or polyvinylidene fluoride.

According to an embodiment of the application, the preparation method of the lithium cobalt oxide battery after formation comprises the following steps: mounting a clamp on the outer surface of the battery cell after the liquid injection is completed, and charging the battery cell with constant current of 0.2-0.4 ℃ for 20-40 min; and then charging with constant current of 0.8C-1C for 40-60 min. Thus, it is advantageous to form uniform and stable Solid Electrolyte Interface (SEI) and positive electrode electrolyte interface (CEI) films.

According to the embodiment of the application, before the charging treatment is performed, the lithium cobaltate battery after the formation is subjected to air exhaust and sealing of a liquid injection port. Compared with the closed-end formation, the open-end formation method is adopted, and gas generated in the formation process, such as CO ₂、H₂ and the like, is released through exhaust after formation, so that the internal pressure of the battery is reduced, and the expansion or rupture of the battery is avoided. After the formation is completed, the liquid injection port is exhausted and sealed, so that the subsequent charging and aging treatment are facilitated.

S200 aging treatment

In this step, the lithium cobaltate battery after the charge treatment is subjected to an aging treatment.

According to an embodiment of the application, the temperature of the aging treatment is 40 ℃ to 60 ℃, such as 40 ℃, 45 ℃, 50 ℃, 55 ℃, 60 ℃ and the like. The temperature of the aging treatment is, for example, 40-50 ℃. Therefore, under the conditions of high temperature and high pressure, the polarization expansion degree of the electrode material is increased, the electrolyte is easier to fully infiltrate the surface of the electrode material, more reaction sites are provided, the film forming additive can be subjected to oxidative decomposition in preference to the solvent, and a stable CEI film is formed on the surface of the high-voltage positive electrode plate by the product. Meanwhile, the high-temperature environment promotes the rapid aging molding of the CEI film, so that the interface stability between the positive electrode plate and the electrolyte is enhanced. And, chemical degradation and internal resistance of the electrode material and the electrolyte can be reduced.

According to the embodiment of the application, the aging treatment is performed for 6-48 hours, such as 6 h, 12 h, 18 h, 20 h, 24 h, 28 h, 32 h, 36 h, 48 h, etc. The aging treatment is performed for 20-28 hours. Thus, stable CEI films can be formed, and chemical degradation and internal resistance of electrode materials and electrolyte can be reduced.

According to an embodiment of the present application, the method of manufacturing a battery further includes: s300, discharging the aged lithium cobalt oxide battery to 0% -70%, such as 0% SOC, 10% SOC, 20% SOC, 30% SOC, 40% SOC, 50% SOC, 60% SOC, 70% SOC and the like, and the aged lithium cobalt oxide battery is exemplified by 40% -60% SOC. The temperature of the discharge is illustratively 20-30 ℃, which may be, for example, 20 ℃, 22 ℃, 24 ℃, 26 ℃, 28 ℃, 30 ℃. Thus, the battery can be placed in a lower state of charge (SOC), thereby reducing battery capacity degradation and extending battery shelf life.

The second aspect of the application provides a lithium cobaltate battery. According to an embodiment of the application, the lithium cobaltate battery is obtained by the method for preparing a lithium cobaltate battery according to the first aspect of the application. The lithium cobaltate battery has good storage performance in a high-temperature high-humidity environment, is not easy to reduce capacity and has long service life. The features and advantages described above for the method of preparing a lithium cobaltate battery are equally applicable to this battery and are not described in detail here.

A third aspect of the present application provides a powered device. According to an embodiment of the present application, the electric device comprises a lithium cobalt oxide battery according to the second aspect of the present application. The features and advantages described above for lithium cobalt oxide batteries are equally applicable to the powered device and are not described in detail herein.

The battery monomer, the battery module and the battery pack can be used as a power supply of electric equipment and also can be used as an energy storage unit of the electric equipment. The powered device may include, but is not limited to, mobile devices (e.g., cell phones, notebook computers, etc.), electric vehicles (e.g., electric only vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, and the like.

As the electric device, a battery cell, a battery module or a battery pack may be selected according to the use requirement thereof.

The electric equipment used as one embodiment can be a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle and the like. To meet the high power and high energy density requirements of the consumer on the battery, a battery pack or battery module may be employed.

The device as another embodiment may be a mobile phone, a tablet computer, a notebook computer, or the like. The device is generally required to be light and thin, and a battery cell can be used as a power supply.

The scheme of the present application will be explained below with reference to examples. It will be appreciated by those skilled in the art that the following examples are illustrative of the present application and should not be construed as limiting the scope of the application. The examples are not to be construed as limiting the specific techniques or conditions described in the literature in this field or as per the specifications of the product. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.

Example 1

1. LiCoO ₂ is used as a positive electrode material, carbon nano tubes and acetylene black are used as a conductive agent, polyvinylidene fluoride is used as a binder, and the mass ratio is 85:10:5:50, uniformly mixing a positive electrode material, a carbon nano tube, acetylene black and polyvinylidene fluoride, coating on an aluminum foil, then placing in a 120 ℃ oven for vacuum drying for 24 hours, tabletting, and rolling to prepare a positive electrode plate; MCMB (mesophase carbon microsphere) is used as a cathode, and a celgard2400 polypropylene porous membrane is used as a diaphragm. The assembly of the cells was completed in an argon filled glove box.

2. The battery cell is put into an outer packaging shell, electrolyte (the mass ratio of cyclic carbonate to linear carbonate to lithium tetrafluoroborate to succinonitrile to ethylene carbonate to ethylene vinylene carbonate is 1:1:1:1:1) is injected, and the following formation treatment is carried out: mounting a clamp on the outer surface of the battery cell after the liquid injection is completed, and charging the battery cell with constant current of 0.3 ℃ for 30min; charging with 0.9C constant current for 50min.

3. And (3) pumping air and sealing a liquid injection port of the battery obtained in the previous step, wherein the voltage of the battery is 4.0V, and the electric quantity is 60% of SOC.

4. The battery obtained in the previous step was charged to 4.48V at 0.7C at room temperature (25.+ -. 3 ℃ C.) and was cut off at 0.025C, at which time the battery charge was 100% SOC.

5. Placing the battery obtained in the previous step in a baking oven at 45 ℃ for aging for 24 hours; and then taken out.

6. Discharging the battery obtained in the previous step to 3.90V at room temperature (25+/-3 ℃), wherein the battery electric quantity is 50% of SOC, and obtaining the lithium ion battery.

Example 2

The difference from example 1 is that in step 4, 0.7C is charged to 4.48v and 0.025C is turned off, at which time the cell is full of 100% SOC, and then discharged for 36min at 0.5C, at which time the battery charge is 70% SOC.

Example 3

The difference from example 1 is that in step 4, 0.7C is charged to 4.48v and 0.025C is turned off, at which time the cell is full of 100% SOC, and then discharged for 24min at 0.5C, at which time the battery charge is 80% SOC.

Example 4

The difference from example 1 is that in step 4, 0.7C is charged to 4.48v and 0.025C is turned off, at which time the cell is full of 100% SOC, and then discharged for 12min at 0.5C, at which time the battery charge is 90% SOC.

Example 5

The difference from example 1 is that in step 5, the aging treatment time was 6 h.

Example 6

The difference from example 1 is that in step 5, the aging treatment time was 20 h.

Example 7

The difference from example 1 is that in step 5, the aging treatment time was 28 h.

Example 8

The difference from example 1 is that in step 5, the aging treatment time was 48 h.

Example 9

The difference from example 1 is that step6 is not included.

Example 10

The difference from example 1 is that in step 6, the battery obtained in the above step was discharged to 3.97V at room temperature, at which time the battery charge was 40% SOC.

Example 11

The difference from example 1 is that in step 6, the battery obtained in the above step was discharged to 3.81V at room temperature, at which time the battery charge was 60% SOC.

Example 12

The difference from example 1 is that in step 6, the battery obtained in the above step was discharged to 3.0V at room temperature, at which time the battery charge was 0% SOC.

Example 13

The difference from example 1 is that in step 6, the battery obtained in the above step was discharged to 3.76V at room temperature, at which time the battery charge was 70% SOC.

Comparative example 1

The difference from example 1 is that steps 4-6 are not included.

Comparative example 2

The difference from example 1 is that step 5 is directly performed on the lithium cobaltate battery treated in step3 without step 4.

Comparative example 3

The difference from example 1 is that step 6 is directly performed on the lithium cobaltate battery treated in step 4 without step 5.

Comparative example 4

The difference from example 1 is that in step 5, the temperature of the aging treatment was 30 ℃.

Comparative example 5

The difference from example 1 is that in step 5, the temperature of the aging treatment was 70 ℃.

Comparative example 6

The difference from example 1 is that in step 4, 0.7C is charged to 4.48v and 0.025C is turned off, at which time the cell is full of 100% SOC and then discharged for 48min at 0.5C, at which time the battery charge is 60% SOC.

Comparative example 7

The difference from example 1 is that LiCoO ₂ is replaced with lithium iron phosphate.

Test case

The lithium ion batteries prepared in examples 1 to 13 and comparative examples 1 to 7 were subjected to high-temperature high-humidity storage performance test, and the specific steps are as follows:

And (3) charging the lithium ion battery to 4.48V at the temperature of 25+/-3 ℃ at the temperature of 0.7 ℃, stopping charging at the temperature of 0.025 ℃, fully charging, and circulating for 2 times according to the condition, wherein the discharge capacity at the 2 nd time is taken as the initial capacity. The fully charged battery is left open circuit for 7d at the temperature of (60+/-2) ℃ and the humidity of 90%, left open circuit for 2h at the room temperature, discharged to 3.0V at the constant current of 0.5C, and recorded as the residual capacity; then charging to 4.48V by 0.7C, stopping 0.025C/discharging to 3.0V by 0.5C constant current, and circulating for 3 times, wherein the highest capacity is recorded as recovered capacity. Capacity remaining rate (%) =remaining capacity/initial capacity, capacity recovery rate (%) =recovery capacity/initial capacity.

The results are shown in Table 1, and the overall performance of the lithium ion batteries prepared in examples 1 to 13 is more excellent than that of comparative examples 1 to 7. The lithium cobaltate battery after formation is charged to a high-voltage state, then is aged, and the film forming additive in the electrolyte is subjected to oxidative decomposition under the conditions of high temperature (40-60 ℃) and high pressure (70-100%SOC), so that a stable CEI film is formed on the surface of the positive electrode plate. The high-temperature environment promotes the rapid aging molding of the CEI film, thereby enhancing the interface stability between the positive electrode plate and the electrolyte, reducing the situation that active lithium loses activity due to being captured by the CEI film under the high-temperature high-humidity storage condition, and reducing the attenuation of battery capacity. Therefore, the lithium ion battery has strong stability in a high-temperature high-humidity storage environment, little capacity loss and higher capacity residual rate and recovery rate.

As can be seen from comparative example 7, the method for preparing a battery according to the present application is not suitable for lithium iron phosphate, and has poor stability, more capacity loss, poor capacity recovery effect, and poor overall performance in a high-temperature and high-humidity storage environment.

TABLE 1

While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims

1. A method of making a lithium cobaltate battery comprising: charging and aging the lithium cobaltate battery after formation in sequence;

The temperature of the aging treatment is 40-60 ℃.

2. The method of claim 1, wherein the charging current of the charging process is 0.5C to 0.8C.

3. The method according to claim 1 or 2, wherein the temperature of the ageing treatment is 40 ℃ to 50 ℃.

4. The method according to claim 1 or 2, wherein the aging treatment is performed for a period of 6 to 48 hours.

5. The method according to claim 1 or 2, wherein the aging treatment is performed for 20 to 28 hours.

6. The method as recited in claim 1, further comprising: and discharging the aged lithium cobaltate battery to 0-70% of SOC.

7. The method according to claim 1 or 6, further comprising: discharging the aged lithium cobaltate battery to 40-60% SOC;

and/or the environmental temperature of the discharge is 20-30 ℃.

8. The method of claim 1, wherein the lithium cobaltate battery after the formation is subjected to a degassing and sealing of a liquid filling port prior to the charging process.

9. The method of claim 1, wherein the lithium cobaltate battery comprises an electrolyte comprising a film forming additive.

10. A lithium cobaltate battery, characterized in that the lithium cobaltate battery is obtained by the method for producing a lithium cobaltate battery according to any one of claims 1 to 9.

11. A powered device comprising the lithium cobalt oxide battery of claim 10.