Electrolyte additive, electrolyte and lithium ion secondary battery containing the same

Patent metadata

Field	Value
Publication number	US-11469448-B2
Application number	US-202016822137-A
Country	US
Kind code	B2
Filing date	Mar 18, 2020
Priority date	Mar 29, 2019
Publication date	Oct 11, 2022
Grant date	Oct 11, 2022

Abstract

The present disclosure provides an electrolyte additive, an electrolyte and a lithium ion secondary battery containing the same. The electrolyte additive has a structure of Formula (1), wherein R1 is hydrogen, a phenyl, a cyano group, an alkyl cyano group or a C1 to C6 alkyls, and each of R2 to R5 is independently selected from hydrogen or a C1 to C6 alkyl. By means of the electrolyte additive, the electrolyte and the lithium ion secondary battery containing the same of the present disclosure, a technical effect of improving electric performance of the lithium ion secondary battery at high voltage and high temperature is achieved.

First claim

What is claimed is:

1. An electrolyte comprising an organic solvent, a lithium salt and an electrolyte additive, wherein the electrolyte additive has a structure of Formula (1):

wherein R 1 is hydrogen, a phenyl, a cyano group, an alkyl cyano group or a C 1 to C 6 alkyl, and
each of R 2 to R 5 is independently selected from hydrogen or a C 1 to C 6 alkyl.

2. The electrolyte as claimed in claim 1 , wherein the electrolyte additive comprises a compound with a structure of Formula (1):

wherein R 1 is hydrogen, a phenyl, a cyano group, a alkyl cyano group or a C 1 to C 6 alkyl, and
each of R 2 to R 5 is hydrogen.

3. The electrolyte as claimed in claim 1 , wherein the electrolyte additive comprises a compound with a structure of Formula (1):

wherein R 1 is a phenyl or a C 1 to C 4 alkyl, and
each of R 2 to R 5 is hydrogen.

4. The electrolyte as claimed in claim 1 , wherein an amount of the electrolyte additive ranges from about 0.2 to about 3 parts by weight, based on 100 parts by weight of the organic solvent and the lithium salt.

5. The electrolyte as claimed in claim 4 , wherein an amount of the organic solvent ranges from about 80 to about 90 parts by weight, based on 100 parts by weight of the organic solvent and the lithium salt.

6. The electrolyte as claimed in claim 4 , wherein an amount of the lithium salt ranges from about 10 to about 20 parts by weight, based on 100 parts by weight of the organic solvent and the lithium salt.

7. The electrolyte as claimed in claim 4 , wherein the organic solvent is selected from a group consisting of ethylene carbonate, propylene carbonate, butyl carbonate, fluoroethylene carbonate, diethyl carbonate, dipropyl carbonate, ethyl methyl carbonate, carbonic acid ethylene ester, dimethyl carbonate, or any combination thereof.

8. The electrolyte as claimed in claim 4 , wherein the lithium salt is selected from a group consisting of LiCl, LiBr, LiPF 6 , LiBF 4 , LiAsF 6 , LiClO 4 , LiB(C 6 H 5 ) 4 , LiCH 3 SO 3 , LiCF 3 SO 3 , LiN(SO 2 CF 3 ) 2 , LiC(SO 2 CF 3 ) 3 , LiAlCl 4 , LiSiF 6 , or any combination thereof.

9. The electrolyte as claimed in claim 1 , wherein an amount of the organic solvent ranges from about 80 to about 90 parts by weight, based on 100 parts by weight of the organic solvent and the lithium salt.

10. The electrolyte as claimed in claim 1 , wherein an amount of the lithium salt ranges from about 10 to about 20 parts by weight, based on 100 parts by weight of the organic solvent and the lithium salt.

11. The electrolyte as claimed in claim 1 , wherein the organic solvent is selected from a group consisting of ethylene carbonate, propylene carbonate, butyl carbonate, fluoroethylene carbonate, diethyl carbonate, dipropyl carbonate, ethyl methyl carbonate, carbonic acid ethylene ester, dimethyl carbonate, or any combination thereof.

12. The electrolyte as claimed in claim 1 , wherein the lithium salt is selected from a group consisting of LiCl, LiBr, LiPF 6 , LiBF 4 , LiAsF 6 , LiClO 4 , LiB(C 6 H 5 ) 4 , LiCH 3 SO 3 , LiCF 3 SO 3 , LiN(SO 2 CF 3 ) 2 , LiC(SO 2 CF 3 ) 3 , LiAlCl 4 , LiSiF 6 , or any combination thereof.

13. A lithium ion secondary battery, wherein the lithium ion secondary battery comprises:
a positive electrode,
a negative electrode,
a separator, and
the electrolyte as claimed in claim 1 .

14. The lithium ion secondary battery as claimed in claim 13 , wherein an amount of the electrolyte additive in the electrolyte ranges from about 0.2 to about 3 parts by weight, based on 100 parts by weight of the organic solvent and the lithium salt.

15. The lithium ion secondary battery as claimed in claim 13 , wherein an amount of the organic solvent in the electrolyte ranges from about 80 to about 90 parts by weight, based on 100 parts by weight of the organic solvent and the lithium salt.

16. The lithium ion secondary battery as claimed in claim 13 , wherein an amount of the lithium salt in the electrolyte ranges from about 10 to about 20 parts by weight, based on 100 parts by weight of the organic solvent and the lithium salt.

17. The lithium ion secondary battery as claimed in claim 13 , wherein the organic solvent in the electrolyte is selected from a group consisting of ethylene carbonate, propylene carbonate, butyl carbonate, fluoroethylene carbonate, diethyl carbonate, dipropyl carbonate, ethyl methyl carbonate, carbonic acid ethylene ester, dimethyl carbonate, or any combination thereof.

18. The lithium ion secondary battery as claimed in claim 13 , wherein the lithium salt in the electrolyte is selected from a group consisting of LiCl, LiBr, LiPF 6 , LiBF 4 , LiAsF 6 , LiClO 4 , LiB(C 6 H 5 ) 4 , LiCH 3 SO 3 , LiCF 3 SO 3 , LiN(SO 2 CF 3 ) 2 , LiC(SO 2 CF 3 ) 3 , LiAlCl 4 , LiSiF 6 , or any combination thereof.

Assignees

• Murata Manufacturing Co

Inventors

• Zhu Cheng
• Pan Jin
• Chen Yingtao

Classifications

• H01M10/0569

  characterised by the solvents · CPC title

• H01M50/46

  Separators, membranes or diaphragms characterised by their combination with electrodes · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M2300/0037

  Mixture of solvents · CPC title

• H01M10/0525 Primary

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