Lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-9991561-B2
Application number	US-201415021669-A
Country	US
Kind code	B2
Filing date	Aug 28, 2014
Priority date	Sep 12, 2013
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

The present invention provides a lithium ion secondary battery comprising: a positive electrode; a negative electrode comprising a negative electrode active material comprising at least one carbon material selected from the group consisting of a natural graphite, an artificial graphite, a non-graphitizable carbon and a graphitizable carbon; and an electrolyte solution comprising a specific cyclic disulfonate ester compound and an acid anhydride.

First claim

The invention claimed is:

1. A lithium ion secondary battery, comprising:
a positive electrode;
a negative electrode comprising a negative electrode active material, the negative electrode active material comprising a non-graphitizable carbon and a natural graphite or an artificial graphite; and
an electrolyte solution comprising a cyclic disulfonate ester compound represented by the following formula (1) and a carboxylic acid anhydride:

wherein R 1 and R 2 are each independently a hydrogen atom, a methyl group, or an ethyl group; and R 3 represents a methylene group (—CH 2 —), an ethylene group (—CH 2 CH 2 —), or a methyl methylene group (—CH(CH 3 )—),
wherein a molar ratio B/A of a content B in the electrolyte solution of the carboxylic acid anhydride to a content A in the electrolyte solution of the cyclic disulfonate ester compound is in the range of 1/9 to 9/1.

2. The lithium ion secondary battery according to claim 1 , wherein the carbon material of the negative electrode active material has a content of the non-graphitizable carbon in the range of 5% by mass to 80% by mass, and a content of the natural graphite or/and the artificial graphite in the range of 20% by mass to 95% by mass.

3. The lithium ion secondary battery according to claim 1 , wherein the negative electrode active material comprises a non-graphitizable carbon and a natural graphite.

4. The lithium ion secondary battery according to claim 1 , wherein the non-graphitizable carbon is a massive non-graphitizable carbon; the natural graphite is a spherical natural graphite; and the artificial graphite is a massive artificial graphite.

5. The lithium ion secondary battery according to claim 1 , wherein at least one of the non-graphitizable carbon, the natural graphite, or the artificial graphite have an average particle diameter in the range of 5 to 90 μm.

6. The lithium ion secondary battery according to claim 1 , wherein the content A in the electrolyte solution of the cyclic disulfonate ester compound is in the range of 0.01 mol/L to 1 mol/L; and
the content B in the electrolyte solution of the carboxylic acid anhydride is in the range of 0.01 mol/L to 1 mol/L.

7. The lithium ion secondary battery according to claim 1 , wherein the carboxylic acid anhydride is at least one selected from the group consisting of maleic anhydride, succinic anhydride, fluorinated succinic anhydride represented by the formula (a) and fluorinated glutaric anhydride represented by the formula (b):

8. The lithium ion secondary battery according to claim 1 , wherein in the formula (1), at least one of R 1 and R 2 is a methyl group or an ethyl group.

9. The lithium ion secondary battery according to claim 1 , wherein in the formula (1), one of R 1 and R 2 is a methyl group or an ethyl group, and the other thereof is a hydrogen atom.

10. The lithium ion secondary battery according to claim 1 , wherein in the formula (1), R 1 and R 2 are hydrogen atoms.

11. The lithium ion secondary battery according to claim 1 , wherein in the formula (1), R 3 is a methylene group or an ethylene group.

12. A lithium ion secondary battery, comprising:
a positive electrode;
a negative electrode comprising a negative electrode active material, the negative electrode active material comprising a non-graphitizable carbon and a natural graphite or an artificial graphite; and
an electrolyte solution comprising a cyclic disulfonate ester compound represented by the following formula (1) and a carboxylic acid anhydride:

wherein R 1 and R 2 are each independently a hydrogen atom, a methyl group, or an ethyl group; and R 3 represents a methylene group (—CH 2 —), an ethylene group (—CH 2 CH 2 —) or a methyl methylene group (—CH(CH 3 )—),
wherein the carbon material of the negative electrode active material has a content of the non-graphitizable carbon in the range of 5% by mass to 80% by mass, and a content of the natural graphite or/and the artificial graphite in the range of 20% by mass to 95% by mass.

13. A lithium ion secondary battery, comprising:
a positive electrode;
a negative electrode comprising a negative electrode active material, the negative electrode active material comprising a non-graphitizable carbon and a natural graphite or an artificial graphite; and
an electrolyte solution comprising a cyclic disulfonate ester compound represented by the following formula (1) and a carboxylic acid anhydride:

wherein R 1 and R 2 are each independently a hydrogen atom, a methyl group, or an ethyl group; and R 3 represents a methylene group (—CH 2 —), an ethylene group (—CH 2 CH 2 —) or a methyl methylene group (—CH(CH 3 )—),
wherein at least one of the non-graphitizable carbon, the natural graphite, or the artificial graphite have an average particle diameter in the range of 5 to 90 μm.

14. A lithium ion secondary battery, comprising:
a positive electrode;
a negative electrode comprising a negative electrode active material, the negative electrode active material comprising a non-graphitizable carbon and a natural graphite or an artificial graphite; and
an electrolyte solution comprising a cyclic disulfonate ester compound represented by the following formula (1) and a carboxylic acid anhydride:

wherein R 1 and R 2 are hydrogen atoms; and R 3 represents a methylene group (—CH 2 —), an ethylene group (—CH 2 CH 2 —) or a methyl methylene group (—CH(CH 3 )—).

Assignees

• Nec Corp

Inventors

• Azami Takeshi
• Ishikawa Hitoshi
• Yoshida Noboru
• Shimanuki Ikiko
• Matsumoto Kazuaki
• Otohata Makihiro

Classifications

• H01M50/414

  Synthetic resins, e.g. thermoplastics or thermosetting resins · CPC title

• H01M50/426

  Fluorocarbon polymers · CPC title

• H01M50/417

  Polyolefins · CPC title

• H01M2300/0037

  Mixture of solvents · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title