Non-aqueous electrolyte solution for battery and lithium secondary battery

Patent metadata

Field	Value
Publication number	US-2021296703-A1
Application number	US-201917262559-A
Country	US
Kind code	A1
Filing date	Jul 25, 2019
Priority date	Jul 26, 2018
Publication date	Sep 23, 2021
Grant date	—

Abstract

A non-aqueous electrolyte solution for a battery, includes: an additive A which is at least one selected from the group consisting of compounds represented by the following Formula (A); an additive B which is at least one selected from the group consisting of lithium monofluorophosphate and lithium difluorophosphate; and an additive C which is at least one selected from the group consisting of compounds containing a sulfur-oxygen bond. In Formula (A), R 1 represents a fluorine atom, or a fluorinated hydrocarbon group having from 1 to 6 carbon atoms; and each of R 2 to R 4 independently represents a hydrogen atom, a fluorine atom, a hydrocarbon group having from 1 to 6 carbon atoms, or a fluorinated hydrocarbon group having from 1 to 6 carbon atoms.

First claim

1 . A non-aqueous electrolyte solution for a battery, comprising:
an additive A which is at least one selected from the group consisting of compounds represented by the following Formula (A); an additive B which is at least one selected from the group consisting of lithium monofluorophosphate and lithium difluorophosphate; and an additive C which is at least one selected from the group consisting of compounds containing a sulfur-oxygen bond:

wherein, in Formula (A), R 1 represents a fluorine atom, or a fluorinated hydrocarbon group having from 1 to 6 carbon atoms; and each of R 2 to R 4 independently represents a hydrogen atom, a fluorine atom, a hydrocarbon group having from 1 to 6 carbon atoms, or a fluorinated hydrocarbon group having from 1 to 6 carbon atoms.

2 . The non-aqueous electrolyte solution for a battery according to claim 1 , wherein the additive C is at least one selected from the group consisting of a cyclic sulfate compound, a cyclic sulfonate compound, a substituted or unsubstituted sulfobenzoic anhydride, a fluorosulfonyl compound, and a lithium sulfonate compound.

3 . The non-aqueous electrolyte solution for a battery according to claim 1 , wherein the additive C is at least one selected from the group consisting of a compound represented by the following Formula (C1), a compound represented by the following Formula (C2), a compound represented by the following Formula (C3), a compound represented by the following Formula (C4), and a compound represented by the following Formula (C5):

wherein, in Formula (C1), each of R11 to R14 independently represents a hydrogen atom, a hydrocarbon group having from 1 to 6 carbon atoms, a group represented by Formula (1a), or a group represented by Formula (1b); wherein, in Formula (1a) and Formula (1b), * represents a bonding position;
wherein, in Formula (C2), each of R 21 to R 24 independently represents a hydrogen atom, a fluorine atom, a hydrocarbon group having from 1 to 6 carbon atoms, or a fluorinated hydrocarbon group having from 1 to 6 carbon atoms;
wherein, in Formula (C3), each of R 31 to R 34 independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having from 1 to 6 carbon atoms, a halogenated hydrocarbon group having from 1 to 6 carbon atoms, a hydrocarbonoxy group having from 1 to 6 carbon atoms, or a halogenated hydrocarbonoxy group having from 1 to 6 carbon atoms;
wherein, in Formula (C4), R 41 represents a fluorine atom, a hydrocarbon group having from 1 to 6 carbon atoms, a hydrocarbonoxy group having from 1 to 6 carbon atoms, or a fluorinated hydrocarbon group having from 1 to 6 carbon atoms; and
wherein, in Formula (C5), R 51 represents a fluorine atom, a hydrocarbon group having from 1 to 6 carbon atoms, a hydrocarbonoxy group having from 1 to 6 carbon atoms, or a fluorinated hydrocarbon group having from 1 to 6 carbon atoms.

4 . The non-aqueous electrolyte solution for a battery according to claim 1 , which is used for a battery comprising a negative electrode active material containing a graphite material.

5 . The non-aqueous electrolyte solution for a battery according to claim 4 , wherein the negative electrode active material further comprises a silicon oxide represented by the following Composition Formula (1):
SiO X   Composition Formula (1)
wherein, in Composition Formula (1), X represents a number from 0.5 to less than 1.6.

6 . The non-aqueous electrolyte solution for a battery according to claim 1 , wherein a content of the additive A is from 0.001% by mass to 20% by mass with respect to a total amount of the non-aqueous electrolyte solution for a battery.

7 . The non-aqueous electrolyte solution for a battery according to claim 1 , wherein a content of the additive B is from 0.001% by mass to 10% by mass with respect to a total amount of the non-aqueous electrolyte solution for a battery.

8 . The non-aqueous electrolyte solution for a battery according to claim 1 , wherein a content of the additive C is from 0.001% by mass to 10% by mass with respect to a total amount of the non-aqueous electrolyte solution for a battery.

9 . A lithium secondary battery comprising:
a positive electrode; a negative electrode comprising a negative electrode active material containing a graphite material; and the non-aqueous electrolyte solution for a battery according to claim 1 .

10 . The lithium secondary battery according to claim 9 , wherein the negative electrode active material further comprises a silicon oxide represented by the following Composition Formula (1):
SiO X   Composition Formula (1)
wherein, in Composition Formula (1), X represents a number from 0.5 to less than 1.6.

11 . A lithium secondary battery obtained by charging and discharging the lithium secondary battery according to claim 9 .

Assignees

• Mitsui Chemicals Inc

Inventors

• Sugawara Kei
• Fujiyama Satoko
• Onishi Hitoshi

Classifications

• H01M10/0525

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

• H01M2300/0048

  Molten electrolytes used at high temperature · CPC title

• H01M4/483

  for non-aqueous cells (H01M4/485 takes precedence) · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M2004/027

  Negative electrodes · CPC title