Battery

Patent metadata

Field	Value
Publication number	US-2018076484-A1
Application number	US-201715814874-A
Country	US
Kind code	A1
Filing date	Nov 16, 2017
Priority date	Sep 16, 2015
Publication date	Mar 15, 2018
Grant date	—

Abstract

A battery includes a positive electrode including a positive electrode active material, a negative electrode, and an electrolytic solution including a lithium hexafluorophosphate and an additive. 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): Li x Me y O α F β . The additive is at least one selected from the group consisting of difluorophosphates, tetrafluoroborates, bis(oxalate)borate salts, bis(trifluoromethanesulfonyl)imide salts, and bis(fluorosulfonyl)imide salts.

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 lithium hexafluorophosphate and an additive, wherein 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):
Li x Me y O α F β   (1)

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, and the additive is at least one selected from the group consisting of difluorophosphates, tetrafluoroborates, bis(oxalate)borate salts, bis(trifluoromethanesulfonyl)imide salts, and bis(fluorosulfonyl)imide salts.

2 . The battery according to claim 1 , wherein
the electrolytic solution includes 0.05 mol/L or more and 0.5 mol/L or less of the additive.

3 . The battery according to claim 2 , wherein
the electrolytic solution includes 0.05 mol/L or more and 0.2 mol/L or less of the additive.

4 . The battery according to claim 1 , wherein
the additive is at least one selected from the group consisting of alkali metal salts, alkaline earth metal salts, magnesium salts, aluminum salts, lithium salts, cesium salts, and calcium salts.

5 . The battery according to claim 1 , wherein
the electrolytic solution includes 0.5 mol/L or more and 2.0 mol/L or less of lithium hexafluorophosphate.

6 . The battery according to claim 1 , wherein
the electrolytic solution includes a nonaqueous solvent, and the nonaqueous solvent is at least one selected from the group consisting of carbonates, carboxylates, ethers, and nitriles.

7 . The battery according to claim 6 , wherein
the electrolytic solution further includes fluoroethylene carbonate.

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

9 . The battery according to claim 8 , wherein
Me is an element selected from Mn and Co or is a solid solution composed of Ni, Co, and Mn.

10 . The battery according to claim 1 , wherein
the positive electrode active material mainly includes the compound.

11 . The battery according to claim 1 , wherein
the compound satisfies: x+y=α+β=3.

12 . 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.

13 . The battery according to claim 12 , 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

• H01M4/1315 Primary

  containing halogen atoms, e.g. LiCoOxFy · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M10/0569

  characterised by the solvents · 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

• C01P2002/54

  one element only · CPC title