Positive electrode active material, nonaqueous electrolyte battery and battery pack

Patent metadata

Field	Value
Publication number	US-2016190569-A1
Application number	US-201615063792-A
Country	US
Kind code	A1
Filing date	Mar 8, 2016
Priority date	Sep 20, 2013
Publication date	Jun 30, 2016
Grant date	—

Abstract

According to one embodiment, a positive electrode active material includes particles and a coating layer. The particles includes a first compound represented by the general formula LiMSO 4 F wherein M is at least one element selected from the group consisting of Fe, Mn, and Zn. The coating layer coats at least one part of surfaces of the particles. The coating layer includes a second compound represented by the general formula LiM′PO 4 wherein M′ is at least one element selected from the group consisting of Fe, Mn, Co, and Mg.

First claim

What is claimed is:

1 . A positive electrode active material comprising particles comprising a first compound represented by the general formula LiMSO 4 F wherein M is at least one element selected from the group consisting of Fe, Mn, and Zn; and
a coating layer, which coats at least one part of surfaces of the particles and comprises a second compound represented by the general formula LiMTPO 4 wherein M′ is at least one element selected from the group consisting of Fe, Mn, Co, and Mg.

2 . The positive electrode active material according to claim 1 , which further comprises a carbon-containing layer which coats at least one part of a surface of the positive electrode active material.

3 . The positive electrode active material according to claim 1 , wherein the particles have an average particle size in a range of from 0.1 μm to 10 μm.

4 . The positive electrode active material according to claim 1 , wherein the coating layer has a thickness in a range of from 1 nm to 1 μm.

5 . The positive electrode active material according to claim 1 , wherein the particles have an average particle size in a range of from 0.1 μm to 1 μm and the coating layer has a thickness in a range of from 10 nm to 100 nm.

6 . The positive electrode active material according to claim 1 , wherein an amount of the coating layer is from 0.5% by mass to 20% by mass based on 100% by mass of the positive electrode active material.

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

8 . The battery according to claim 7 , wherein the negative electrode comprises at least one selected from a group consisting of a lithium-titanium oxide, a titanium oxide, and a niobium-titanium composite oxide.

9 . The battery according to claim 7 , wherein the negative electrode comprises a lithium-titanium oxide having a spinel structure.

10 . The battery according to claim 7 , wherein the negative electrode comprises monoclinic TiO 2 .

11 . The battery according to claim 7 , wherein the negative electrode comprises Li x Nb a Ti b O c wherein 0≦x≦3, 0<a≦3, 0<b≦3, and 5≦c≦10.

12 . The battery according to claim 11 , wherein a part of Nb atoms or a part of Ti atoms in the Li x Nb a Ti b O c is substituted by at least one element selected from a group consisting of V, Zr, Ta, Cr, Mo, W, Ca, Mg, Al, Fe, Si, B, P, K, and Na.

13 . A battery pack comprising the nonaqueous electrolyte battery according to claim 7 .

Assignees

• Toshiba Kk

Inventors

• Sasakawa Tetsuya
• Takami Norio

Classifications

• H01M4/366 Primary

  as layered products · CPC title

• H01M10/0525

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

• H01M4/5825

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

• H01M4/136

  Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title