Additive for nonaqueous electrolyte solutions, nonaqueous electrolyte solution containing same, and nonaqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-2023070559-A1
Application number	US-202117794356-A
Country	US
Kind code	A1
Filing date	Jan 21, 2021
Priority date	Jan 30, 2020
Publication date	Mar 9, 2023
Grant date	—

Abstract

An additive for a nonaqueous electrolyte includes a bis-alkoxysilyl compound having two or more silyl groups coupled with an alkylene group or an amino group, the two or more silyl groups each has at least one selected from the group consisting of an alkoxy group and an oxyalkyl group, and the oxyalkyl group is represented by —O—(CxH2x+1Oy), where x is an integer of 1 or more, and y is an integer of 1 or more.

First claim

1 . An additive for a nonaqueous electrolyte comprising an alkoxysilyl compound,
wherein the alkoxysilyl compound has two or more silyl groups coupled with an alkylene group or an amino group, the two or more silyl groups each has at least one selected from the group consisting of an alkoxy group and an oxyalkyl group, and the oxyalkyl group is represented by —O—(C x H 2x+1 O y ), where x is an integer of 1 or more, and y is an integer of 1 or more.

2 . The additive for a nonaqueous electrolyte according to claim 1 , wherein the alkoxysilyl compound is at least one selected from the group consisting of bis(alkoxysilyl)alkane and bis(alkoxysilyl alkyl)amine represented by general formula (1), the bis(alkoxysilyl alkyl)amine having an alkylene group between N and Si:

R1 is an alkylene group or a secondary or tertiary amino group,
at least one of R2 to R4 is at least one selected from the group consisting of an alkoxy group having 1 to 6 carbon atoms, and an oxyalkyl group represented by —O—(C x1 H 2x1+1 O y1 ), where x1 is an integer of 1 or more, and y1 is an integer of 1 or more,
at least one of R5 to R7 is at least one selected from the group consisting of an alkoxy group having 1 to 6 carbon atoms, and an oxyalkyl group represented by —O—(C x2 H 2x2+1 O y2 ), where x2 is an integer of 1 or more, and y2 is an integer of 1 or more, and
the remainder of R2 to R7 is each independently an alkyl group or oxyalkyl group represented by C x3 H 2x3+1 O y3 , where x3 is an integer of 1 or more, and y3 is an integer of 0 or more.

3 . The additive for a nonaqueous electrolyte of claim 2 , wherein the bis(alkoxysilyl)alkane is at least one selected from the group consisting of 1,2-bis(trialkoxysilyl)ethane and 1,6-bis(trialkoxysilyl)hexane.

4 . The additive for a nonaqueous electrolyte of claim 2 , wherein the bis(alkoxysilyl alkyl)amine is bis[3-(trialkoxysilyl)propyl] amine.

5 . A nonaqueous electrolyte comprising a nonaqueous solvent, a salt dissolved in the nonaqueous solvent, and the additive for a nonaqueous electrolyte according to claim 1 .

6 . The nonaqueous electrolyte of claim 5 , wherein a concentration of the additive for a nonaqueous electrolyte is 10 mass % or less.

7 . The nonaqueous electrolyte of claim 6 , wherein the concentration of the additive for a nonaqueous electrolyte is 0.2 mass % or more.

8 . A nonaqueous electrolyte secondary battery comprising a negative electrode including a negative electrode mixture layer, a positive electrode, and the nonaqueous electrolyte of claim 5 , wherein
the negative electrode mixture layer contains a negative electrode active material, and the negative electrode active material is a material containing a silicon element.

9 . The nonaqueous electrolyte secondary battery according to claim 8 , wherein the material containing a silicon element is a composite material, and
the composite material includes a lithium ion conductive phase and silicon particles dispersed in the lithium ion conductive phase.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Shibata Sho
• Suzuki Hirotetsu
• Sakata Motohiro

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/386 Primary

  Silicon or alloys based on silicon · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/625

  Carbon or graphite · CPC title