Battery

Patent metadata

Field	Value
Publication number	US-11710816-B2
Application number	US-202017020530-A
Country	US
Kind code	B2
Filing date	Sep 14, 2020
Priority date	Sep 16, 2015
Publication date	Jul 25, 2023
Grant date	Jul 25, 2023

Abstract

A battery includes a positive electrode including a positive electrode active material, a negative electrode, and an electrolytic solution including a nonaqueous solvent. The positive electrode active material includes a compound having a crystal structure belonging to a space group FM3-M and represented by Compositional Formula (1): LixMeyOαFβ, where, Me is one or more elements selected from the group consisting of Mn, Co, Ni, Fe, Al, B, Ce, Si, Zr, Nb, Pr, Ti, W, Ge, Mo, Sn, Bi, Cu, Mg, Ca, Ba, Sr, Y, Zn, Ga, Er, La, Sm, Yb, V, and Cr; and subscripts x, y, α, and β satisfy the following requirements: 1.7≤x≤2.2, 0.8≤y≤1.3, 1≤α≤2.5, and 0.5≤β≤2. The nonaqueous solvent includes a solvent having at least one fluoro group.

First claim

What is claimed is:

1. A battery comprising:
a positive electrode including a positive electrode active material;
a negative electrode; and
an electrolytic solution including a nonaqueous solvent, wherein
the positive electrode active material includes a compound having a crystal structure belonging to a space group FM-3M and represented by Compositional Formula (1):
Li x Me y O α F β   (1)

where Me is at least one element selected from the group consisting of Mn, Co, Ni, Fe, Al, B, Ce, Si, Zr, Nb, Pr, Ti, W, Ge, Mo, Sn, Bi, Cu, Mg, Ca, Ba, Sr, Y, Zn, Ga, Er, La, Sm, Yb, V, and Cr; and
subscripts x, y, α, and β satisfy the following requirements:
1.7≤x≤2.2,
0.8≤y≤1.3,
1≤α≤2.5,
0.5≤β≤2, and
x+y=α+β=3, and
the nonaqueous solvent includes a solvent having at least one fluoro group.

2. The battery according to claim 1 , wherein
the solvent having at least one fluoro group is included in the nonaqueous solvent at a volume percent ranging from 20% to where the nonaqueous solvent is composed of substantially only the solvent having at least one fluoro group.

3. The battery according to claim 1 , wherein
the solvent having at least one fluoro group is at least one selected from the group consisting of a cyclic solvent and a linear solvent.

4. The battery according to claim 1 , wherein
the solvent having at least one fluoro group is at least one selected from the group consisting of carbonates, carboxylates, sulfones, and nitriles.

5. The battery according to claim 4 , wherein
the solvent having at least one fluoro group is at least one selected from the group consisting of carbonates and carboxylates.

6. The battery according to claim 5 , wherein
the solvent having at least one fluoro group is a compound obtained by replacing one or more hydrogen atoms of a compound selected from the group consisting of ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, methyl acetate, methyl propionate, ethyl acetate, and ethyl propionate with an equal number of fluoro groups.

7. The battery according to claim 6 , wherein
the solvent having at least one fluoro group is a compound obtained by replacing one or more hydrogen atoms of a compound selected from the group consisting of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, methyl acetate, methyl propionate, and ethyl acetate with an equal number of fluoro groups.

8. The battery according to claim 7 , wherein
the solvent having at least one fluoro group is at least one compound selected from the group consisting of fluoroethylene carbonate, 3,3,3-trifluoropropylene carbonate, (2,2,2-trifluoroethyl)methyl carbonate, (2,2,2-trifluoroethyl)ethyl carbonate, 2,2,2-trifluoroethyl acetate, methyl 3,3,3-trifluoropropionate, and methyl fluoroacetate.

9. The battery according to claim 1 , wherein
the electrolytic solution includes a lithium salt; and
the lithium salt is at least one selected from the group consisting of LiBF 4 ,
LiPF 6 , LiN(SO 2 CF 3 ) 2 , LiN(SO 2 F) 2 , and lithium bis(oxalate)borate.

10. The battery according to claim 1 , wherein
Me includes at least one selected from the group consisting of Mn, Co, and Ni.

11. The battery according to claim 10 , wherein
Me is an element selected from the group consisting of Mn and Co, or is a solid solution composed of Ni, Co, and Mn.

12. The battery according to claim 1 , wherein
the positive electrode active material includes 90 wt % or more of the compound.

13. The battery according to claim 1 , wherein
the compound satisfies
1.79≤x≤2.18;
0.82≤y≤1.21;
1.5≤α≤2.5; and
0.5≤β≤1.5.

14. The battery according to claim 13 , wherein
the compound satisfies
x=2;
y=1;
1.5≤α≤2; and
1≤β≤1.5.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Nakatsutsumi Takayuki
• Natsui Ryuichi
• Hojo Nobuhiko

Classifications

• H01M10/0569 Primary

  characterised by the solvents · CPC title

• C01G53/82

  Compounds containing nickel, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• C01G51/82

  Compounds containing cobalt, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• C01G45/22

  Compounds containing manganese, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• C01P2006/40

  Electric properties · CPC title