Electrolyte composition for a lithium-ion battery

Patent metadata

Field	Value
Publication number	US-10069165-B2
Application number	US-201514960879-A
Country	US
Kind code	B2
Filing date	Dec 7, 2015
Priority date	Jun 7, 2013
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

An electrolyte composition for a lithium-ion battery, a lithium-ion battery, and also the use of a fluorine-containing cyclic carbonate component and lithium nitrate for improving the cycle stability and/or for increasing the performance of a lithium-ion battery.

First claim

What is claimed is:

1. An electrolyte composition for a lithium-ion battery with at least one cathode and at least one anode, the electrolyte composition comprising:
at least one aprotic nonaqueous solvent;
one fluorine-containing cyclic carbonate component; and
at least two lithium salts,
wherein one of the lithium salts is lithium nitrate, which is present in a quantity from 0.05% to 20% by weight relative to a total weight of the electrolyte composition,
wherein the fluorine-containing cyclic carbonate component is present in a quantity from 5% to 12% by weight relative to the total weight of the electrolyte composition,
wherein the anode is a silicon anode or a silicon/carbon composite anode, and wherein the electrolyte composition contains lithium bis(fluorosulfonyl)imide as an additional lithium salt.

2. The electrolyte composition according to claim 1 , wherein the fluorine-containing cyclic carbonate component is fluoroethylene carbonate.

3. A lithium-ion battery comprising:
a casing;
a battery core having at least one cathode and at least one anode, wherein the anode is a silicon anode or a silicon/carbon composite anode; and
an electrolyte composition according to claim 1 .

4. The electrolyte composition according to claim 1 , wherein the fluorine-containing cyclic carbonate component and lithium nitrate improve a cycle stability of a lithium-ion battery.

5. The electrolyte composition according to claim 1 , wherein the fluorine-containing cyclic carbonate component and lithium nitrate increase a performance of a lithium-ion battery.

6. The electrolyte composition according to claim 1 , wherein the fluorine-containing cyclic carbonate component and lithium nitrate form a surface layer on the anode.

7. The electrolyte composition according to claim 6 , further comprising vinylene carbonate.

8. The lithium-ion battery according to claim 3 , wherein the battery core further comprises at least one separator element.

9. The lithium-ion battery according to claim 8 , wherein the at least one separator element has a microporous structure.

10. The electrolyte composition according to claim 1 , wherein the at least one aprotic nonaqueous solvent is propylene carbonate (PC), ethylene carbonate (EC), dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), tetrahydrofuran (THF), 1,2-dimethoxyethane (DME), 2-methyltetrahydrofuran (2Me-THF), vinylene carbonate (VC), N-methylpyrrolidone (NMP), acetonitrile, or ethyl acetate, or a combination thereof.

11. An electrolyte composition for a lithium-ion battery with at least one cathode and at least one anode, the electrolyte composition comprising:
at least one aprotic nonaqueous solvent;
one fluorine-containing cyclic carbonate component; and
at least two lithium salts,
wherein one of the lithium salts is lithium nitrate,
wherein the fluorine-containing cyclic carbonate component is present in a quantity from 5% to 12% by weight relative to the total weight of the electrolyte composition,
wherein the anode is a silicon anode or a silicon/carbon composite anode, and
wherein the electrolyte composition contains lithium bis(fluorosulfonyl)imide as an additional lithium salt.

Assignees

• Volkswagen Ag

Inventors

• Doelle Janis
• Herrmann Mirko

Classifications

• H01M4/364

  as mixtures · CPC title

• H01M2300/0034

  Fluorinated solvents · CPC title

• H01M10/0568

  characterised by the solutes · CPC title

• H01M2300/0037

  Mixture of solvents · CPC title

• H01M2300/0025

  Organic electrolyte · CPC title