Electrolyte solution for secondary batteries, and secondary battery using same

Patent metadata

Field	Value
Publication number	US-9941545-B2
Application number	US-201414771763-A
Country	US
Kind code	B2
Filing date	Feb 28, 2014
Priority date	Mar 1, 2013
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

Disclosed is an electrolyte solution for lithium secondary batteries, including a cyclic sulfonic acid ester represented by the general formula (1):

wherein, in the general formula (1), R 1 and R 2 each independently represent a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, halogen or an amino group with the proviso that R 1 and R 2 do not represent hydrogen atoms at the same time; and R 3 represents methylene which may be substituted with fluorine. Batteries using this electrolyte solution are excellent in battery properties and storage characteristics.

First claim

The invention claimed is:

1. A lithium secondary battery comprising a positive electrode, a negative electrode, and an electrolyte solution, wherein the electrolyte solution comprises
a nonaqueous solvent at least selected from the group consisting of cyclic carbonates, linear carbonates, aliphatic carboxylic acid esters, γ-lactones, cyclic ethers, linear ethers and the fluorine derivatives of these compounds;
one or more materials as lithium salt, 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 ), in which n and m are natural numbers; and
additive(s) consisting of:
(i) a cyclic sulfonic acid ester represented by Compound No. 1:

(ii) optionally, a sultone compound represented by the following general formula (4):

wherein in the general formula (4), n represent an integer of 0 to 2, R 1 to R 6 each independently represent a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms or an aryl group having 6 to 12 carbon atoms;
(iii) optionally, a vinylene carbonate or a derivative thereof; and
(iv) optionally, an overcharge-preventing agent and/or a surfactant;

wherein the negative electrode comprises graphite as a negative electrode active material; and
wherein the positive electrode comprises a lithium-containing composite oxide as a positive electrode active material.

2. The secondary battery according to claim 1 , wherein the cyclic sulfonic acid ester represented by Compound No. 1 is included at a proportion of 0.005% by weight to 10% by weight based on the total mass of the electrolyte solution.

3. The secondary battery according to claim 1 , comprising a film outer package.

4. A battery for a vehicle comprising the secondary battery according to claim 1 .

5. A vehicle comprising the battery for a vehicle according to claim 4 .

6. A method for producing a lithium secondary battery comprising a positive electrode, a negative electrode, and an electrolyte solution, comprising:
preparing the electrolyte solution by dissolving additive(s) consisting of:
(i) a cyclic sulfonic acid ester represented by Compound No. 1 and a supporting electrolyte salt in a nonaqueous solvent;

(ii) optionally, a sultone compound represented by the following general formula (4):

wherein in the general formula (4), n represents an integer of 0 to 2, R 1 to R 6 each independently represent a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms or an aryl group having 6 to 12 carbon atoms;
(iii) optionally, a vinylene carbonate or a derivative thereof; and
(iv) optionally, an overcharge-preventing agent and/or a surfactant; and
one or more materials as lithium salt, 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 ), in which n and m are natural numbers,

in a nonaqueous solvent at least selected from the group consisting of cyclic carbonates, linear carbonates, aliphatic carboxylic acid esters, γ-lactones, cyclic ethers, linear ethers and the fluorine derivatives of these compounds; and
assembling the lithium secondary battery using the prepared electrolyte solution, the positive electrode, and the negative electrode, wherein the negative electrode comprises graphite as a negative electrode active material; and wherein the positive electrode comprises a lithium-containing composite oxide as a positive electrode active material.

Assignees

• Nec Corp

Inventors

• Shimanuki Ikiko
• Ishikawa Hitoshi
• Kawasaki Daisuke

Classifications

• H01M50/105

  Pouches or flexible bags · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M2300/0025

  Organic electrolyte · CPC title