Electrolyte solution and lithium ion batteries using the same

Patent metadata

Field	Value
Publication number	US-2016233546-A1
Application number	US-201614991804-A
Country	US
Kind code	A1
Filing date	Jan 8, 2016
Priority date	Feb 6, 2015
Publication date	Aug 11, 2016
Grant date	—

Abstract

Disclosed in this application is an electrolyte solution, comprising a non-aqueous organic solvent, a lithium salt, and additives, characterized in that the additives comprise a cyclic sulfate ester compound and a naphthalene compound with amino group. When the electrolyte solution is used in lithium ion secondary batteries, the batteries are ensured to have good cycling and storage performances at high temperature, and have the advantages of low swelling during use at high temperature, low internal resistance and good charge and discharge performances at low temperature.

First claim

1 . An electrolyte solution, comprising a non-aqueous organic solvent, a lithium salt, and additives, wherein the additives comprise:
a cyclic sulfate ester compound; and a naphthalene compound with amino group.

2 . The electrolyte solution according to claim 1 , wherein the cyclic sulfate ester compound is selected from at least one of the compounds having a chemical structure as shown in Formulas I, II, III, and IV:

wherein R 1 is hydrogen or selected from a C 1-10 alkyl group; and R 2 is hydrogen or selected from a C 1-10 alkyl group;

wherein R 3 is hydrogen or selected from a C 1-10 alkyl group; R 4 is hydrogen or selected from a C 1-10 alkyl group; and R 5 is hydrogen or selected from a C 1-10 alkyl group;

wherein R 6 is hydrogen or selected from a C 1-10 alkyl group; R 7 is hydrogen or selected from a C 1-10 alkyl group; R 8 is hydrogen or selected from a C 1-10 alkyl group; and R 9 is hydrogen or selected from a C 1-10 alkyl group; and

wherein R 10 is hydrogen or selected from a C 1-10 alkyl group; R 11 is hydrogen or selected from a C 1-10 alkyl group; R 12 is hydrogen or selected from a C 1-10 alkyl group; R 13 is hydrogen or selected from a C 1-10 alkyl group; and R 14 is hydrogen or selected from a C 1-10 alkyl group.

3 . The electrolyte solution according to claim 2 , wherein the cyclic sulfate ester compound is selected from at least one of the compounds having a chemical structure as shown in Formula I.

4 . The electrolyte solution according to claim 1 , wherein the cyclic sulfate ester compound is selected from at least one of ethylene sulfate, propylene sulfate, and butylene sulfate.

5 . The electrolyte solution according to claim 1 , wherein the cyclic sulfate ester compound is present in the electrolyte solution in an amount of 0.01-5% by weight.

6 . The electrolyte solution according to claim 1 , wherein the naphthalene compound with amino group is selected from at least one of the compounds having a chemical structure as shown in Formula V:

wherein R 15 is selected from a C 1-10 alkyl group; R 16 is selected from a C 1-10 alkyl group; and n is any positive integer selected from 1 to 8.

7 . The electrolyte solution according to claim 1 , wherein the naphthalene compound with amino group is selected from at least one of 1,8-bis(dimethylamino)naphthalene, 1,8-bis(diethylamino)naphthalene, 1,8-bis(dipropylamino)naphthalene, 1,2-bis(dimethylamino)naphthalene, 1,7-bis(dimethylamino)naphthalene, 1,2,6-tris(methylamino)naphthalene, 2,3,6,7-tetrakis(methylamino)naphthalene, 1-monoaminonaphthalene, 1,2,3,5,8-pentakis(methylamino)naphthalene, and 1,2,3,4,5,6,7,8-octakis(methylamino)naphthalene.

8 . The electrolyte solution according to claim 1 , wherein the naphthalene compound with amino group is present in the electrolyte solution in an amount of 0.01-3% by weight.

9 . The electrolyte solution according to claim 1 , wherein the lithium salt comprises lithium hexafluorophosphate.

10 . A lithium ion battery, comprising the electrolyte solution[s] according to claim 1 .

11 . A lithium ion battery, comprising the electrolyte solution[s] according to claim 2 .

12 . A lithium ion battery, comprising the electrolyte solution[s] according to claim 3 .

13 . A lithium ion battery, comprising the electrolyte solution[s] according to claim 4 .

14 . A lithium ion battery, comprising the electrolyte solution[s] according to claim 5 .

15 . A lithium ion battery, comprising the electrolyte solution[s] according to claim 6 .

16 . A lithium ion battery, comprising the electrolyte solution[s] according to claim 7 .

17 . A lithium ion battery, comprising the electrolyte solution[s] according to claim 8 .

18 . A lithium ion battery, comprising the electrolyte solution[s] according to claim 9 .

Assignees

• Ningde Amperex Technology Ltd

Inventors

• Feng Shaowei
• Han Changlong
• Fu Chenghua
• Lin Yongshou

Classifications

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M10/0568

  characterised by the solutes · CPC title

• H01M10/0525

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

• Y02E60/10

  Energy storage using batteries · CPC title