Lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-9711825-B2
Application number	US-201414771898-A
Country	US
Kind code	B2
Filing date	Feb 28, 2014
Priority date	Mar 1, 2013
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

A lithium ion secondary battery comprising a negative electrode comprising one or more types of carbon selected from the group consisting of natural graphite, artificial graphite, non-graphitizable carbon and easily graphitizable carbon; and an electrolyte solution comprising a cyclic sulfonic acid ester represented by the following formula (1):

wherein in the formula (1), R 1 and R 2 are each independently a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, a halogen group or an amino group with the proviso that R 1 and R 2 are not hydrogen atoms at the same time; R 3 represents a linkage group selected from the group consisting of an alkylene group having 1 to 5 carbon atoms, a carbonyl group, a sulfonyl group, a fluoroalkylene group having 1 to 6 carbon atoms, and a divalent group having 2 to 6 carbon atoms in which alkylene units or fluoroalkylene units are bonded through an ether group.

First claim

The invention claimed is:

1. A lithium ion secondary battery comprising:
a negative electrode comprising a negative electrode active material comprising at least two different carbons selected from the group of carbons consisting of natural graphite, artificial graphite, non-graphitizable carbon, and easily graphitizable carbon wherein at least one of the carbons of the negative electrode active material comprises massive non-graphitizable carbon; and
an electrolyte solution comprising a cyclic sulfonic acid ester represented by the following formula (1):

wherein, in the formula (1), R 1 and R 2 are each independently a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, a halogen atom or an amino group with the proviso that R 1 and R 2 are not hydrogen atoms at the same time; R 3 represents a linkage group selected from the group consisting of an alkylene group having 1 to 5 carbon atoms, a carbonyl group, a sulfonyl group, a fluoroalkylene group having 1 to 6 carbon atoms, and a divalent group having 2 to 6 carbon atoms in which alkylene units or fluoroalkylene units are bonded through an ether group.

2. The lithium ion secondary battery according to claim 1 , wherein at least one of the carbons of the negative electrode active material comprises spherical natural graphite.

3. The lithium ion secondary battery according to claim 1 , wherein at least one of the carbons of the negative electrode active material comprises massive artificial graphite.

4. The lithium ion secondary battery according to claim 1 , wherein at least one of the carbons of the negative electrode active material comprises flake-like easily graphitizable carbon.

5. The lithium ion secondary battery according to claim 1 , wherein in the formula (1), R 1 is a hydrogen atom.

6. The lithium ion secondary battery according to claim 1 , wherein in the formula (1), R 1 is a hydrogen atom and R 3 is —(CH 2 ) n — or —(CF 2 ) n — (n=an integer of 1 to 5).

7. The lithium ion secondary battery according to claim 1 , wherein in the general formula (1), R 1 is a hydrogen atom, R 2 is —C m H 2m+1 (m=1 to 3) and R 3 is —CH 2 —.

8. The lithium ion secondary battery according to claim 1 , wherein the electrolyte solution further comprises a compound having one or more sulfonyl groups.

9. The lithium ion secondary battery according to claim 8 , wherein the compound having one or more sulfonyl groups is a sultone compound represented by the following formula (2):

wherein in the general formula (4), n is an integer of 0 or more and 2 or less; and R 1 to R 6 are each independently selected from a hydrogen atom, an alkyl group having 1 or more and 12 or less carbon atoms, a cycloalkyl group having 3 or more and 6 or less carbon atoms and an aryl group having 6 or more and 12 or less carbon atoms.

10. The lithium ion secondary battery according to claim 1 , wherein the cyclic sulfonic acid ester represented by the formula (1) is comprised in a content of 0.005% by mass or more and 10% by mass or less to the total mass of the electrolyte solution.

11. The lithium ion secondary battery according to claim 1 , wherein the electrolyte solution further comprises a vinylene carbonate or a derivative thereof.

12. The lithium ion secondary battery according to claim 1 , wherein the electrolyte solution further comprises as a lithium salt, one or more compounds selected from the group consisting of LiPF 6 , LiBF 4 , LiAsF 6 , LiSbF 6 , LiClO 4 , LiAlCl 4 , and LiN(C n F 2n+1 SO 2 )(C m F 2m+1 SO 2 ) (n and m are natural numbers).

13. The lithium ion secondary battery according to claim 1 , wherein at least one of the carbons of the negative electrode active material is selected from the group of carbons consisting of spherical natural graphite, massive artificial graphite, and flake-like easily graphitizable carbon.

14. A method for producing a lithium ion secondary battery having an electrode element, a nonaqueous electrolyte solution and an outer package, the method comprising:
preparing an electrode element by arranging a positive electrode and a negative electrode comprising a negative electrode active material so as to face each other; and
enclosing the electrode element and a nonaqueous electrolyte solution in an outer package,
wherein the nonaqueous electrolyte solution comprises a cyclic sulfonic acid ester represented by formula (1); and
the negative electrode active material comprises at least two different carbons selected from the group of carbons consisting of natural graphite, artificial graphite, non-graphitizable carbon and easily graphitizable carbon, wherein at least one of the carbons of the negative electrode active material comprises massive non-graphitizable carbon;

wherein, in formula (1), R 1 and R 2 are each independently a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, a halogen atom or an amino group with the proviso that R 1 and R 2 are not hydrogen atoms at the same time; R 3 represents a linkage group selected from the group consisting of an alkylene group having 1 to 5 carbon atoms, a carbonyl group, a sulfonyl group, a fluoroalkylene group having 1 to 6 carbon atoms, and a divalent group having 2 to 6 carbon atoms in which alkylene units or fluoroalkylene units are bonded through an ether group.

Assignees

• Nec Corp

Inventors

• Azami Takeshi
• Yoshida Noboru
• Shimanuki Ikiko

Classifications

• H01M10/0569 Primary

  characterised by the solvents · CPC title

• H01M10/0525

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

• H01M4/587

  for inserting or intercalating light metals · CPC title

• Y02T10/7011

  Cross-Sectional Technologies · mapped topic

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title