Lithium-manganese composite oxide, secondary battery, and electric device

Patent metadata

Field	Value
Publication number	US-2015014605-A1
Application number	US-201414318727-A
Country	US
Kind code	A1
Filing date	Jun 30, 2014
Priority date	Jul 15, 2013
Publication date	Jan 15, 2015
Grant date	—

Abstract

The amount of lithium ions that can be received and released in and from a positive electrode active material is increased, and high capacity and high energy density of a secondary battery are achieved. Provided is a lithium-manganese composite oxide represented by Li x Mn y M z O w , where M is a metal element other than Li and Mn, or Si or P, and y, z, and w satisfy 0≦x/(y+z)<2, y>0, z>0, 0.26≦(y+z)/w<0.5, and 0.2<z/y<1.2. The lithium manganese composite oxide has high structural stability and high capacity.

First claim

1 . A lithium-manganese composite oxide represented by Li x Mn y M z O w ,
wherein M is a metal element other than Li and Mn, Si, or P, and wherein y, z, and w are each greater than zero and satisfy 0.26≦(y+z)/w<0.5.

2 . The lithium-manganese composite oxide according to claim 1 ,
wherein the lithium-manganese composite oxide comprises a layered rock-salt crystal structure and a spinel crystal structure, and wherein x, y, and z satisfy 0≦x/(y+z)<2 and 0.2<z/y<1.2.

3 . The lithium-manganese composite oxide according to claim 1 , wherein the element represented by M is a metal element selected from Ni, Ga, Fe, Mo, In, Nb, Nd, Co, Sm, Mg, Al, Ti, Cu, and Zn, or Si or P.

4 . A lithium-ion secondary battery comprising the lithium-manganese composite oxide according to claim 1 as a positive electrode active material.

5 . An electric device comprising the lithium-ion secondary battery according to claim 4 .

6 . A lithium-manganese composite oxide represented by Li x Mn y M z O w ,
wherein M is a metal element other than Li and Mn, Si, or P, wherein y, z, and w are each greater than zero and satisfy 0.26≦(y+z)/w<0.5, and wherein one particle in the lithium-manganese composite oxide comprises a spinel crystal structure and a layered rock-salt crystal structure in contact with the spinel crystal structure.

7 . The lithium-manganese composite oxide according to claim 6 , wherein the element represented by M is a metal element selected from Ni, Ga, Fe, Mo, In, Nb, Nd, Co, Sm, Mg, Al, Ti, Cu, and Zn, or Si or P.

8 . A lithium-ion secondary battery comprising the lithium-manganese composite oxide according to claim 6 as a positive electrode active material.

9 . An electric device comprising the lithium-ion secondary battery according to claim 8 .

10 . A lithium-manganese composite oxide represented by Li x Mn y M z O w ,
wherein M is a metal element other than Li and Mn, or Si or P, wherein y and z are each greater than zero, wherein x, y, z, and w satisfy 0≦x/(y+z)<2 and 0.26≦(y+z)/w<0.5, wherein the lithium-manganese composite oxide comprises a layered rock-salt crystal structure and a spinel crystal structure, wherein the layered rock-salt crystal structure belongs to a space group C12/m1, and wherein in the layered rock-salt crystal structure, the sum of an occupancy of Mn and an occupancy of the element represented by M at a 2b site is greater than or equal to 40%.

11 . The lithium-manganese composite oxide according to claim 10 , wherein in the layered rock-salt crystal structure, the sum of an occupancy of Mn at a 2c site and an occupancy of Mn at a 4h site, A(Mn) 2c+4h , represented by Formula (1) and an occupancy of M at the 2c site and an occupancy of M at the 4h site, A(M) 2c+4h , represented by Formula (2) is greater than or equal to 0.2, where A(Mn) 2c is the occupancy of Mn at the 2c site, A(M) 2c is the occupancy of M at the 2c site, A(Mn) 4h is the occupancy of Mn at the 4h site, and A(M) 4h is the occupancy of M at the 4h site.
A (Mn) 2c+4h =[A (Mn) 2c ×1 +A (Mn) 4h ×2]÷(1+2)  Formula (1)
A ( M ) 2c+4h =[A ( M ) 2c ×1 +A ( M ) 4h ×2]÷(1+2)  Formula (2)

12 . The lithium-manganese composite oxide according to claim 10 , wherein the element represented by M is a metal element selected from Ni, Ga, Fe, Mo, In, Nb, Nd, Co, Sm, Mg, Al, Ti, Cu, and Zn, or Si or P.

13 . A lithium-ion secondary battery comprising the lithium-manganese composite oxide according to claim 10 as a positive electrode active material.

14 . An electric device comprising the lithium-ion secondary battery according to claim 13 .

15 . A lithium-manganese composite oxide represented by Li x Mn y Ni z O w ,
wherein y and z are each greater than zero, wherein x, y, z, and w satisfy 0≦x/(y+z)<2 and 0.26≦(y+z)/w<0.5, wherein the lithium-manganese composite oxide comprises a layered rock-salt crystal structure and a spinel crystal structure, wherein the layered rock-salt crystal structure belongs to a space group C12/m1, and wherein in the layered rock-salt crystal structure, an a-axis lattice constant is larger than or equal to 0.494 nm and a b-axis lattice constant is larger than or equal to 0.856 nm.

16 . The lithium-manganese composite oxide according to claim 15 , wherein a c-axis lattice constant of the layered rock-salt crystal structure is larger than or equal to 0.5021 nm.

17 . A lithium-ion secondary battery comprising the lithium-manganese composite oxide according to claim 15 as a positive electrode active material.

18 . An electric device comprising the lithium-ion secondary battery according to claim 17 .

19 . A lithium-manganese composite oxide represented by Li D Mn y M z O w ,
wherein M is a metal element other than Li and Mn, or Si or P, wherein y and z are each greater than zero, and wherein x, y, z, and w satisfy 1.35≦D/(y+z)<2 and 0.2<z/y<1.2.

20 . The lithium-manganese composite oxide according to claim 19 , wherein the element represented by M is a metal element selected from Ni, Ga, Fe, Mo, In, Nb, Nd, Co, Sm, Mg, Al, Ti, Cu, and Zn, or Si or P.

21 . A lithium-ion secondary battery comprising the lithium-manganese composite oxide according to claim 19 as a positive electrode active material.

22 . An electric device comprising the lithium-ion secondary battery according to claim 21 .

Assignees

• Semiconductor Energy Lab

Inventors

• Kawakami Takahiro
• Yoshitomi Shuhei
• Ochiai Teruaki
• Saito Yumiko
• Momma Yohei
• Seo Satoshi
• Mikami Mayumi
• Adachi Shunsuke

Classifications

• H01M10/0525

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

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01B1/08

  oxides · CPC title

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• H01M4/505 Primary

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title