Electrolytic solution and secondary battery

Patent metadata

Field	Value
Publication number	US-10361464-B2
Application number	US-201515319345-A
Country	US
Kind code	B2
Filing date	Jun 16, 2015
Priority date	Jun 16, 2014
Publication date	Jul 23, 2019
Grant date	Jul 23, 2019

Abstract

The present invention relates to an electrolytic solution comprising a cyclic dicarboxylic acid ester represented by the specific formula, and the secondary battery comprising the same. According to the present invention, the electrolytic solution comprising an additive which can improve a characteristics in a secondary battery and a secondary battery comprising the same can be provided.

First claim

The invention claimed is:

1. An electrolytic solution for a secondary battery comprising:
a nonaqueous solvent, and
at least one compound selected from the group consisting of a compound represented by the following formula (4) and a compound represented by the following formula (5),

wherein in the formula (4), R 6 represents a substituted or unsubstituted alkylene group having 1 to 5 carbon atoms which may be branched.

2. The electrolytic solution for a secondary battery according to claim 1 , wherein the compound represented by the formula (4) comprises a six-membered ring compound represented by the following formula (6):

wherein in the formula (6), R 7 represents a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 3 carbon atoms that may be branched.

3. The electrolytic solution for a secondary battery according to claim 1 , wherein the compound represented by the formula (4) comprises a compound represented by the following formula (7):

4. The electrolytic solution for a secondary battery according to claim 1 , comprising a lithium salt as an electrolyte.

5. The electrolytic solution for a secondary battery according to claim 4 , wherein the lithium salt is at least one lithium salt selected from the group consisting of LiPF 6 , LiBF 4 , LiAsF 6 , LiSbF 6 , LiClO 4 , LiAlCl 4 and LiN(C k F 2k+1 SO 2 )(C m F 2m+1 SO 2 ) wherein k and m are each independently 1 or 2.

6. The electrolytic solution for a secondary battery according to claim 1 , wherein the nonaqueous solvent is at least one organic solvent selected from the group consisting of cyclic carbonates, open-chain carbonates, aliphatic carboxylic acid esters, γ-lactones, cyclic ethers, open-chain ethers and fluorine derivatives of these compounds.

7. A secondary battery comprising a positive electrode, a negative electrode and an electrolytic solution for a secondary battery, wherein the electrolytic solution for a secondary battery is an electrolytic solution for a secondary battery according to claim 1 .

8. The secondary battery according to claim 7 , wherein the positive electrode comprises lithium-containing composite oxide capable of absorbing and desorbing lithium as a positive electrode active material.

9. The secondary battery according to claim 7 , wherein the negative electrode comprises carbon as a negative electrode active material.

10. A method for producing an electrolytic solution for a secondary battery, comprising dissolving in a nonaqueous solvent,
at least one compound selected from the group consisting of a compound represented by the following formula (4) and a compound represented by the following formula (2),

wherein in the formula (4), R 6 represents a substituted or unsubstituted alkylene group having 1 to 5 carbon atoms which may be branched.

Assignees

• Nec Corp

Inventors

• Yoshida Noboru
• Shimanuki Ikiko
• Saitho Shinsaku
• Ishikawa Hitoshi

Classifications

• H01M10/0569

  characterised by the solvents · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• H01M10/0567

  characterised by the additives · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M10/4235 Primary

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title