JP2018163893A5

JP2018163893A5 -

Info

Publication number: JP2018163893A5
Application number: JP2018139767A
Authority: JP
Filing date: 2018-07-25
Publication date: 2018-12-27
Anticipated expiration: 2037-03-22

Description

実施形態によれば、正極と、負極と、セパレータと、第１の電解質と、第２の電解質とを含む二次電池が提供される。負極は、リチウムイオンを吸蔵放出可能な負極活物質粒子を含む。セパレータは、少なくとも正極及び負極の間に配置される。セパレータは、リチウムイオン伝導性の固体電解質を含む。第１の電解質は、少なくとも正極中に存在し、第１のリチウム塩及び第１の水系溶媒を含む。第２の電解質は、少なくとも負極中に存在し、第２のリチウム塩及び第２の水系溶媒を含む。第２の電解質のリチウムイオン濃度は、第１の電解質のリチウムイオン濃度以上の値である。 According to the embodiment, a secondary battery including a positive electrode, a negative electrode, a separator, a first electrolyte, and a second electrolyte is provided. The negative electrode includes negative electrode active material particles capable of occluding and releasing lithium ions. The separator is disposed at least between the positive electrode and the negative electrode. The separator includes a lithium ion conductive solid electrolyte. The first electrolyte is present in at least the positive electrode and includes a first lithium salt and a first aqueous solvent. The second electrolyte is present at least in the negative electrode and includes a second lithium salt and a second aqueous solvent. The lithium ion concentration of the second electrolyte is a value equal to or higher than the lithium ion concentration of the first electrolyte.

Claims

A positive electrode;
A negative electrode containing negative electrode active material particles capable of occluding and releasing lithium ions ;
A separator disposed between at least the positive electrode and the negative electrode and including a lithium ion conductive solid electrolyte;
A first electrolyte present in at least the positive electrode and comprising a first lithium salt and a first aqueous solvent;
At least the present in the negative electrode, seen containing a second electrolyte containing the second lithium salt and the second water-based solvent,
The lithium ion concentration of the second electrolyte is a secondary battery having a value equal to or higher than the lithium ion concentration of the first electrolyte .

The secondary battery according to claim 1, wherein a pH value of the second electrolyte is higher than a pH value of the first electrolyte.

The anion of the second lithium salt of the second electrolyte is selected from the group consisting of Cl ⁻ , OH ⁻ , [(FSO ₂ ) ₂ N] ⁻ and [(CF ₃ SO ₂ ) ₂ N] ^−. The secondary battery of Claim 1 or 2 containing 1 type, or 2 or more types of ion.

The anion of the first lithium salt of the first electrolyte includes one or more ions selected from the group consisting of Cl ⁻ , NO ₃ ⁻ , CO ₃ ²⁻ , and SO ₄ ²⁻ . The secondary battery of any one of Claims 1-3 .

The negative active material particles comprise a titanium-containing oxide, the secondary battery according to any one of claims 1-4.

The separator comprises a complex of the solid electrolyte and a polymer material, a secondary battery according to any one of claims 1-5.

The battery pack containing the secondary battery of any one of Claims 1-6 .

The battery pack according to claim 7 , comprising a plurality of the secondary batteries, wherein the plurality of secondary batteries are electrically connected in series, parallel, or a combination of series and parallel.

The battery pack according to claim 7 or 8 , further comprising a protection circuit and an external terminal for energization.

A vehicle comprising the battery pack according to claim 7 .

The vehicle according to claim 10 , wherein the battery pack collects regenerative energy of power of the vehicle.