Negative electrode active material, nonaqueous electrolyte battery, battery pack and vehicle

Patent metadata

Field	Value
Publication number	US-10553868-B2
Application number	US-201715435877-A
Country	US
Kind code	B2
Filing date	Feb 17, 2017
Priority date	Dec 2, 2014
Publication date	Feb 4, 2020
Grant date	Feb 4, 2020

Abstract

According to one embodiment, a negative electrode active material includes particles and a carbon material. The particles is represented by Li 2+a A d Ti 6−b B b O 14−c , where A is at least one element selected from the group consisting of Na, K, Mg, Ca, Ba, and Sr; B is a metal element other than Ti; and a, b, c, and d respectively satisfy 0≤a≤5, 0≤b≤6, 0≤c≤0.6, and 0≤d≤3. The carbon material covers at least a part of surfaces of the particles.

First claim

What is claimed is:

1. A negative electrode active material comprising:
particles represented by Li 2+a A d Ti 6−b B b O 14−c , where A is at least one element selected from the group consisting of Na, K, Mg, Ca, Ba, and Sr; B is at least one element selected from the group consisting of Nb and Ta; and a, b, c, and d respectively satisfy 0≤a≤5, 0<b ≤6, 0≤c≤0.6, and 0≤d≤3; and
a carbon material covering at least a part of surfaces of the particles;
wherein a true density of the negative electrode active material excluding the carbon material is from 3.5 g/cm 3 to 4.8 g/cm 3 .

2. The negative electrode active material according to claim 1 , wherein a content of the carbon material is from 0.05% by weight to 5% by weight.

3. The negative electrode active material according to claim 1 , wherein A is at least one element selected from the group consisting of Na and K.

4. A nonaqueous electrolyte battery comprising:
a positive electrode;
a negative electrode comprising the negative electrode active material according to claim 1 ; and
a nonaqueous electrolyte.

5. The nonaqueous electrolyte battery according to claim 4 , wherein the positive electrode comprises a first positive electrode active material represented by Li x Fe 1−w Mn w SO 4 F wherein 0≤x≤1.1, 0≤w≤0.2, and a second positive electrode active material represented by Li x Fe 1−y−z Mn y M z PO 4 wherein M is at least one element selected from the group consisting of Mg, Al, Ti, and Zr, and 0≤x≤1.1, 0≤y≤1, 0≤z≤0.2.

6. A battery pack comprising a battery module comprising the nonaqueous electrolyte batteries according to claim 4 electrically connected in 5 series, 6 series, or from 18 to 24 series.

7. A battery pack comprising a battery module comprising the nonaqueous electrolyte battery according to claim 4 .

8. The battery pack according to claim 7 , which further comprises a protective circuit and an external power distribution terminal.

9. A vehicle comprising the battery pack according to claim 7 .

10. The vehicle according to claim 9 , which is an idling stop vehicle with a regenerative function.

11. The negative electrode active material according to claim 1 , wherein the carbon material has a layer form, a particle form or a fiber form.

12. A negative electrode comprising the negative electrode active material according to claim 1 .

13. The negative electrode according to claim 12 , wherein the negative electrode is used in a potential range of 2 to 0.5 V vs. Li/Li + with respect to an electrode potential of a lithium metal during insertion and extraction of lithium ions.

14. The negative electrode according to claim 12 , wherein the negative electrode active material comprises single primary particles, secondary particles or a mixture thereof.

15. The negative electrode according to claim 12 which comprises a negative electrode material layer comprising the negative electrode active material and a conductive agent comprising at least one selected from the group consisting of acetylene black, carbon black, cokes, carbon fibers, graphite, Li 4 Ti 5 O 12 , metal compound powders, and metal powders.

Assignees

• Toshiba Kk

Inventors

• Takami Norio
• Harada Yasuhiro
• Ise Kazuki

Classifications

• C01P2006/40

  Electric properties · CPC title

• C01G23/005

  Alkali titanates · CPC title

• C01P2004/62

  Submicrometer sized, i.e. from 0.1-1 micrometer · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M10/4257

  Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries · CPC title