Non-aqueous electrolyte for lithium ion secondary battery and lithium ion secondary battery using same

Patent metadata

Field	Value
Publication number	US-2020112060-A1
Application number	US-201816495569-A
Country	US
Kind code	A1
Filing date	Sep 14, 2018
Priority date	Sep 26, 2017
Publication date	Apr 9, 2020
Grant date	—

Abstract

A non-aqueous electrolyte for a lithium ion secondary battery capable of improving rate characteristics, and the lithium ion secondary battery using the same. The non-aqueous electrolyte for the lithium ion secondary battery includes a carboxylic acid ester and 2.0×10 −6 to 3.0×10 −3 mol/L of halide ion other than fluoride ion.

First claim

1 . A non-aqueous electrolyte for a lithium ion secondary battery, comprising a carboxylic acid ester and 2.0×10 −6 to 3.0×10 −3 mol/L of halide ion other than fluoride ion.

2 . The non-aqueous electrolyte for the lithium ion secondary battery according to claim 1 , further comprising a halogenated cyclic carbonate represented by the following chemical formula (1)
(where X 1 and X 2 represent halogen excluding fluorine or hydrogen, provided that one of X 1 and X 2 is halogen excluding fluorine).

3 . The non-aqueous electrolyte for the lithium ion secondary battery according to claim 2 , wherein the electrolyte comprises 1.0×10 −6 to 3.0×10 −3 mol/L of the halogenated cyclic carbonate.

4 . The non-aqueous electrolyte for the lithium ion secondary battery according to claim 1 , wherein the carboxylic acid ester is represented by the following chemical formula (2)
(where R 1 and R 2 each represents a linear or branched alkyl group or a substituted alkyl group having 1 to 4 carbon atoms, and a total number of carbon atoms of R 1 and R 2 is 5 or less).

5 . The non-aqueous electrolyte for the lithium ion secondary battery according to claim 1 , wherein the carboxylic acid ester is propionic acid ester or acetic acid ester.

6 . The non-aqueous electrolyte for the lithium ion secondary battery according to claim 1 , wherein the halide ion other than the fluoride ion is a chloride ion.

7 . A lithium ion secondary battery comprising:
a positive electrode; a negative electrode; a separator positioned between the positive electrode and the negative electrode; and the non-aqueous electrolyte for the lithium ion secondary battery according to claim 1 .

8 . The lithium ion secondary battery according to claim 7 , wherein the positive electrode comprises a lithium vanadium compound.

9 . The lithium ion secondary battery according to claim 8 , wherein the lithium vanadium compound is LiVOPO 4 .

Assignees

• Tdk Corp

Inventors

• Hasegawa Tomohiko
• KAKUTA Hirofumi
• Kume Yusuke

Classifications

• H01M4/58

  of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates · CPC title

• H01M10/0569 Primary

  characterised by the solvents · CPC title

• H01M10/0567

  characterised by the additives · CPC title

• H01M10/0525 Primary

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

• H01M2300/0054

  Halogenides · CPC title