Nonaqueous electrolyte battery, battery pack and vehicle

Patent metadata

Field	Value
Publication number	US-11522191-B2
Application number	US-202017020575-A
Country	US
Kind code	B2
Filing date	Sep 14, 2020
Priority date	Mar 16, 2016
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

A nonaqueous electrolyte battery includes: a positive electrode containing a positive electrode active material made of a compound represented by a compositional formula of LiMn 1-x-y Fe x A y PO 4 (wherein A is at least one selected from the group consisting of Mg, Ca, Al, Ti, Zn and Zr, 0≤x≤0.3, and 0≤y≤0.1); a negative electrode containing a negative electrode active material made from a titanium composite oxide; and a nonaqueous electrolyte, wherein a ratio (I P—F /I P—O ) of a peak intensity (I P—F ) of a P—F bond to a peak intensity (I P—O ) of a P—O bond on the surface of the positive electrode, which are measured by X-ray photoelectron spectroscopic analysis, is 0.4 or more and 0.8 or less.

First claim

The invention claimed is:

1. A nonaqueous electrolyte battery comprising:
a positive electrode containing a positive electrode active material made of a compound represented by a compositional formula of
LiMn 1-x-y Fe x A y PO 4

wherein
A is at least one selected from the group consisting of Mg, Ca, Al, Ti, Zn and Zr, 0≤x≤0.3, and 0≤y≤0.1,
a surface of the positive electrode active material is at least partially coated with a carbonaceous material, and
the surface of the positive electrode active material is further coated with a material containing P—F bonds obtained by reaction of the positive electrode active material with an electrolyte salt;
a negative electrode containing a negative electrode active material made from a titanium composite oxide; and
a nonaqueous electrolyte comprising an organic solvent and a lithium salt selected from the group consisting of lithium hexafluorophosphate (LiPF 6 ), lithium tetrafluoroborate (LiBF 4 ) and lithium hexafluoroarsenate (LiAsF 6 ), wherein
a ratio (I P—F /I P—O ) of a peak intensity (I P—F ) of a P—F bond to a peak intensity (I P—O ) of a P—O bond on the surface of the positive electrode, which are measured by X-ray photoelectron spectroscopic analysis, is 0.4 or more and 0.8 or less.

2. The nonaqueous electrolyte battery according to claim 1 , wherein the titanium composite oxide comprises at least one selected from the group consisting of a spinel type lithium titanate Li 4 Ti 5 O 12 , a monoclinic β type titanium composite oxide TiO 2 , and Ti 1-X M1 x Nb 2-y M2 y O 7-δ wherein
M1 and M2 are at least one selected from the group consisting of Mg, Fe, Ni, Co, W, Ta and Mo,
M1 and M2 may be the same or different, 0≤x≤1, and 0≤y≤1, and
Li 2 Na 2-x M1 x Ti 6 O 14 wherein M1 is at least one selected from the group consisting of Nb, W, Ta and Mo, and 0≤x≤1.

3. A battery pack comprising at least one of the nonaqueous electrolyte battery according to claim 1 .

4. The battery pack according to claim 3 , further comprising an external terminal for energization and a protective circuit.

5. The battery pack according to claim 3 comprising a plurality of the nonaqueous electrolyte batteries, wherein the nonaqueous electrolyte batteries are connected in series, in parallel or with a combination of series connection and parallel connection.

6. The nonaqueous electrolyte battery according to claim 1 , wherein the organic solvent is selected from the group consisting of cyclic carbonates, chain carbonates, cyclic ethers, chain ethers, γ-butyrolactone (GBL); α-methyl-γ-butyrolactone (MBL);
acetonitrile (AN), and sulfolane (SL).

7. The nonaqueous electrolyte battery according to claim 1 , wherein the organic solvent is a mixture comprising two or more selected from the group consisting of propylene carbonate (PC), ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC) methyl ethyl carbonate (MEC), and γ-butyrolactone ((IBL).

8. A vehicle equipped with the battery pack according to claim 3 .

9. The vehicle according to claim 8 , wherein the battery pack recovers a regenerative energy of a power of the vehicle.

Assignees

• Toshiba Kk

Inventors

• Yamashita Yasunobu
• Hoshina Keigo
• Isozaki Yoshiyuki
• Takami Norio

Classifications

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M4/0485

  Casting · CPC title

• H01M4/5825 Primary

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• H01M10/425

  Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00) · CPC title