Electrolytic solution and electrochemical device using the same

Patent metadata

Field	Value
Publication number	US-2022123363-A1
Application number	US-202117362730-A
Country	US
Kind code	A1
Filing date	Jun 29, 2021
Priority date	Jan 25, 2019
Publication date	Apr 21, 2022
Grant date	—

Abstract

An electrolytic solution includes a compound containing a —CN functional group

and a compound containing a silicon functional group. M is C or Si. R 11 , R 12 , and R 13 are each independently selected from a substituted or non-substituted C 1 -C 12 alkylene group, a substituted or non-substituted C 2 -C 12 alkenylene group, an O—R group, an R 0 —S—R group or an R 0 —O—R group, R 0 and R are each independently selected from a substituted or non-substituted C 1 -C 6 alkylene group. n is 0 or 1. R 14 is H, fluorine, a cyano group, a substituted or non-substituted C 1 -C 12 alkyl group, a substituted or non-substituted C 2 -C 12 alkenyl group, an O—R 1 group, an R 0 —S—R 1 group, or an R 0 —O—R 1 group. R 0 is a substituted or non-substituted C 1 -C 6 alkylene group, and R 1 is a substituted or non-substituted C 1 -C 6 alkyl group.

First claim

What is claimed is:

1 . An electrolytic solution, comprising: a compound containing a —CN functional group and a compound containing a silicon functional group; wherein,
the compound containing the —CN functional group comprises a compound represented by formula I-A:

wherein M is C or Si;R 11 , R 12 , and R 13 are each independently selected from a substituted or non-substituted C 1 -C 12 alkylene group, a substituted or non-substituted C 2 -C 12 alkenylene group, an O—R group, an R 0 —S—R group or an R 0 —O—R group, R 0 and R are each independently selected from a substituted or non-substituted C 1 -C 6 alkylene group;
n is selected from 0 or 1;
R 14 is selected from H, fluorine, a cyano group, a substituted or non-substituted C 1 -C 12 alkyl group, a substituted or non-substituted C 2 -C 12 alkenyl group, an O—R 1 group, an R 0 —S—R 1 group, or an R 0 —O—R 1 group, R 0 is selected from a substituted or non-substituted C 1 -C 6 alkylene group, and R 1 is selected from a substituted or non-substituted C 1 -C 6 alkyl group; and
when being substituted, a substituent group is selected from a halogen, a cyano group, a C 1 -C 6 alkyl group, a C 2 -C 6 alkenyl group or any combination thereof.

2 . The electrolytic solution according to claim 1 , wherein the compound containing the silicon functional group comprises at least one of a compound represented by formula II-A and a compound represented by formula II-B:

wherein, R 21 and R 22 are independently selected from R a C(R′) 3 or Si—(R″) 3 ;
wherein, each R a is independently selected from a C 1 -C 12 alkyl group, a C 1 -C 12 alkoxy group, a C 2 -C 12 alkenyl group, a C 1 -C 10 heterocyclyl group or a C 6 -C 26 aryl group;
wherein, each of R′ and R″ is independently selected from H, F, a C 1 -C 12 alkyl group, a C 1 -C 12 alkoxy group, a C 2 -C 12 alkenyl group, a C 1 -C 10 heterocyclyl group or a C 6 -C 26 aryl group;
wherein, at least one of R 21 and R 22 contains Si;
wherein, R 23 and R 24 are each independently selected from R a or Si—(R″) 3 ;
wherein, each of R a and R″ is independently selected from H, a C 1 -C 12 alkyl group, a C 1 -C 12 alkenyl group, a C 1 -C 10 heterocyclyl group or a C 6 -C 26 aryl group; and
wherein, at least one of R 23 and R 24 contains Si.

3 . The electrolytic solution according to claim 2 , wherein at least one of R 21 and R 22 contains an F atom, and at least one of R 23 and R 24 contains an F atom.

4 . The electrolytic solution according to claim 1 , wherein the compound containing the —CN functional group comprises at least one of the following compounds:

5 . The electrolytic solution according to claim 1 , wherein the compound containing the silicon functional group comprises at least one of the following compounds:

6 . The electrolytic solution according to claim 1 , wherein based on the total weight of the electrolytic solution, a weight percentage of the compound containing the —CN functional group is about 0.01 wt % to about 10 wt %, and a weight percentage of the compound containing the silicon functional group is about 0.00 1 wt % to about 30 wt %.

7 . The electrolytic solution according to claim 1 , further comprising a compound containing a sulfur-oxygen double bond functional group, wherein the compound containing the sulfur-oxygen double bond functional group comprises a compound represented by formula III-A:

wherein R 31 is selected from a substituted or non-substituted C 1 -C 12 is alkylene group, a substituted or non-substituted C 2 -C 12 alkenylene group, a heteroatom-containing substituted or non-substituted C 1 -C 12 alkylene group, or a heteroatom-containing substituted or non-substituted C 2 -C 12 alkenylene group;
wherein when being substituted, a substituent group is selected from a halogen, a C 1 -C 6 alkyl group, a C 2 -C 6 alkenyl group or any combination thereof; and
the heteroatom is selected from O, S, P or any combination thereof.

8 . The electrolytic solution according to claim 7 , wherein the compound containing the sulfur-oxygen double bond functional group comprises at least one of the following compounds:

9 . The electrolytic solution according to claim 1 , further comprising a boron-containing compound, wherein the boron-containing compound comprises a compound represented by formula IV-A:

is wherein R 41 , R 42 , and R 43 are each independently selected from R b —Si—(R c ) 3 , a substituted or non-substituted C 1 -C 12 alkyl group, a substituted or non-substituted C 1 -C 12 alkoxy group, a substituted or non-substituted C 2 -C 12 alkenyl group, a substituted or non-substituted C 6 -C 26 aryl group, or a substituted or non-substituted C 3 -C 10 cyclohydrocarbon group;
wherein R b is selected from a substituted or non-substituted C 1 -C 12 alkylene group, a substituted or non-substituted C 2 -C 12 alkenylene group, a substituted or non-substituted C 6 -C 10 cycloalkylene group, or a substituted or non-substituted C 6 -C 26 arylene group;
wherein R c is selected from H, F, a substituted or non-substituted C 1 -C 12 alkyl group, a substituted or non-substituted C 1 -C 12 alkoxy group, a substituted or non-substituted C 2 -C 12 alkenyl group, a substituted or non-substituted C 6 -C 10 cyclohydrocarbon group, or a substituted or non-substituted C 6 -C 26 aryl group; and
wherein when substituted, a substituent is selected from a halogen, a C 1 -C 6 alkyl group, a C 1 -C 6 alkenyl group, a cyano group or any combination thereof.

10 . The electrolytic solution according to claim 9 , wherein the boron-containing compound comprises at least one of the following compounds:

and wherein based on the total weight of the electrolytic solution, a weight percentage of the boron-containing compound is about 0.01 wt % to about 10 wt %.

11 . The electrolytic solution according to claim 1 , further comprising an isocyanurate compound, wherein the isocyanurate compound comprises a compound represented by formula V-A:

wherein R 51 , R 52 , and R 53 are each independently selected from H, a halogen, a substituted or non-substituted C 1 -C 12 alkyl group, a substituted or non-substituted C 2 -C 12 alkenyl group, a substituted or non-substituted C 6 -C 26 aryl group, or a substituted or non-substituted C 1 -C 10 heterocyclyl group; and
wherein when being substituted, a substituent is selected from a halogen, a C 1 -C 6 alkyl group, a C 2 -C 6 alkenyl group or any combination thereof.

12 . The electrolytic solution according to claim 11 , wherein the isocyanurate compound comprises at least one

Assignees

• Ningde Amperex Technology Ltd

Inventors

• Li Wenqiang
• Ma Juan
• Tang Chao
• Liu Junfei

Classifications

• H01M2300/0025

  Organic electrolyte · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0525 Primary

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

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title