Nonaqueous electrolyte battery and battery pack

Patent metadata

Field	Value
Publication number	US-9755233-B2
Application number	US-201615063801-A
Country	US
Kind code	B2
Filing date	Mar 8, 2016
Priority date	Sep 17, 2013
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

According to one embodiment, a nonaqueous electrolyte battery includes a positive electrode, a negative electrode and a nonaqueous electrolyte. The positive electrode includes a first positive electrode active material which is represented by general formula LiMSO 4 F (M is at least one kind of element selected from the group consisting of Fe, Mn and Zn) and has a triplite type crystal structure, and a second positive electrode active material which is represented by general formula LiM′SO 4 F (M′ is at least one kind of element selected from the group consisting of Fe, Mn and Zn) and has a tavorite type crystal structure.

First claim

What is claimed is:

1. A nonaqueous electrolyte battery comprising:
a positive electrode comprising particles of a first positive electrode active material which is represented by general formula LiMSO 4 F, wherein M is at least one element selected from the group consisting of Fe, Mn and Zn and has a triplite type crystal structure, and particles of a second positive electrode active material which is represented by general formula LiM′SO 4 F (M′ is at least one kind of element selected from the group consisting of Fe, Mn and Zn) and has a tavorite type crystal structure;
a negative electrode comprising a negative electrode active material comprising at least one selected from a group consisting of a lithium titanium oxide, a titanium oxide, a niobium titanium composite oxide and a carbon material; and
a nonaqueous electrolyte,
wherein a ratio of the first positive electrode active material to the total mass of the first positive electrode active material and the second positive electrode active material is from 10 mass % to 40 mass %.

2. The battery according to claim 1 , wherein a negative electrode potential difference is not more than 0.3 V between a negative electrode potential versus lithium at a depth of discharge of 10% and negative electrode potential versus lithium at a depth of discharge of 90% when the nonaqueous electrolyte battery is discharged from a fully charged state to a completely discharged state at a 0.2 C rate.

3. The battery according to claim 1 , wherein an average diameter of the particles of the first positive electrode active material and an average diameter of the particles of the second positive electrode active material fall within a range of from 0.1 μm to 10 μm.

4. The battery according to claim 1 , wherein the negative electrode active material comprises a lithium-titanium oxide having a spinel structure.

5. The battery according to claim 1 , wherein the negative electrode active material comprises monoclinic TiO 2 .

6. The battery according to claim 1 , wherein the negative electrode active material comprises Li x Nb a Ti b O c wherein 0≦x≦3, 0<a≦3, 0<b≦3, and 5≦c≦10.

7. The battery according to claim 6 , wherein a part of Nb or a part of Ti 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.

8. A battery pack comprising the nonaqueous electrolyte battery according to claim 1 .

9. The battery according to claim 1 , wherein the ratio of the first positive electrode active material to the total mass of the first positive electrode active material and the second positive electrode active material is in a range of 10 mass % to 20 mass %.

10. The battery according to claim 1 , wherein the positive electrode comprises a positive electrode current collector and a positive electrode material layer formed on at least one side surface of the positive electrode current collector, and comprising the particles of the first positive electrode active material, the particles of the second positive electrode active material, a conducting agent and a binder.

11. The battery according to claim 10 , wherein the conducting agent comprises at least one selected from the group consisting of acetylene black, carbon black, and graphite.

Assignees

• Toshiba Kk

Inventors

• Sasakawa Tetsuya
• Takami Norio

Classifications

• H01M4/364

  as mixtures · CPC title

• H01M4/583

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/48

  of inorganic oxides or hydroxides · CPC title

• H01M4/5825

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

• H01M4/625

  Carbon or graphite · CPC title