Gelled electrolyte and preparation method thereof

Patent metadata

Field	Value
Publication number	US-2022052376-A1
Application number	US-201917274185-A
Country	US
Kind code	A1
Filing date	Sep 9, 2019
Priority date	Sep 10, 2018
Publication date	Feb 17, 2022
Grant date	—

Abstract

A gel composition, in particular a gelled electrolyte, comprising: i) fumed alumina particles, wherein the mean primary particle size of the particle is from 5 to 50 nm and the BET specific surface area is from 40 to 400 m 2 /g; ii) at least two organic solvents; and iii) a lithium salt; wherein the amount of the alumina particles is 0.2-10% by weight based on the total weight of the gel composition. A method to prepare a gelled electrolyte, a Li-ion battery, a Li-ion battery and a device are also provided.

First claim

1 - 7 . (canceled)

8 . A gel composition, comprising:
i) fumed alumina particles, wherein the mean primary particle size of the particles is from 5 to 50 nm and the BET specific surface area is from 40 to 400 m 2 /g; ii) at least two organic solvents; and iii) a lithium salt;
wherein the amount of the fumed alumina particles is 0.2-10% by weight based on the total weight of the gel composition, and wherein the fumed alumina particles are not surface-modified.

9 . The gel composition of claim 8 , wherein the composition is a gelled electrolyte.

10 . The gel composition of claim 8 , wherein the mean primary particle size of the fumed alumina particles is from 10 to 30 nm.

11 . The gel composition of claim 8 , wherein the BET specific surface area of the fumed alumina particles is from 50 to 150 m 2 /g.

12 . The gel composition of claim 8 , wherein the amount of the fumed alumina particles is 0.5-8% by weight, based on the total weight of the gel composition.

13 . The gel composition of claim 9 , wherein the mean primary particle size of the fumed alumina particles is from 10 to 30 nm.

14 . The gel composition of claim 13 , wherein the BET specific surface area of the fumed alumina particles is from 50 to 150 m 2 /g.

15 . The gel composition of claim 14 , wherein the amount of the fumed alumina particles is 0.5-8% by weight based on the total weight of the gel composition.

16 . A method of preparing a gelled electrolyte, comprising the following steps:
a) mixing at least two organic solvents and a lithium salt to obtain a liquid mixture; and b) dispersing fumed alumina particles in the liquid mixture to obtain the gelled electrolyte;
wherein:
the mean primary particle size of the fumed alumina particles is from 5 to 50 nm and the BET specific surface area of the fumed alumina particles is from 40 to 400 m 2 /g;
the amount of the alumina particles is 0.2-10% by weight, based on the total weight of the gel composition; and
the alumina particles are not surface-modified.

17 . The method of claim 16 , wherein the electrochemical rate performance of the gelled electrolyte or a Li-ion battery comprising the gelled electrolyte is improved.

18 . The method of claim 17 , wherein the fumed alumina particles are dried before mixing in step a).

19 . The method of claim 16 , wherein the mean primary particle size of the fumed alumina particles is from 10 to 30 nm.

20 . The method of claim 16 , wherein the BET specific surface area of the fumed alumina particles is from 50 to 150 m 2 /g.

21 . The method of claim 16 , wherein the amount of the fumed alumina particles is 0.5-8% by weight based on the total weight of the gel composition.

22 . The method of claim 18 , wherein the mean primary particle size of the fumed alumina particles is from 10 to 30 nm.

23 . The method of claim 22 , wherein the BET specific surface area of the fumed alumina particles is from 50 to 150 m 2 /g.

24 . The method of claim 23 , wherein the amount of the fumed alumina particles is 0.5-8% by weight based on the total weight of the gel composition.

25 . A Li-ion battery, comprising the gelled electrolyte of claim 2 .

26 . The Li-ion battery of claim 25 , wherein the mean primary particle size of the fumed alumina particles in the gelled electrolyte is from 10 to 30 nm.

27 . The Li-ion battery of claim 26 , wherein the BET specific surface area of the fumed alumina particles in the gelled electrolyte is from 50 to 150 m 2 /g and wherein the amount of the fumed alumina particles in the gelled electrolyte is 0.5-8% by weight based on the total weight of the gelled electrolyte.

Assignees

• Su Shasha
• Jiang Jinhua
• Feng Jing
• Wang Dong
• Huang Yuan Chang
• Yang Jun
• Lei Bin
• Xu Zhixin
• Evonik Operations Gmbh

Inventors

• Su Shasha
• Jiang Jinhua
• Feng Jing
• Wang Dong
• Huang Yuan-Chang
• Yang Jun
• Lei Bin
• Xu Zhixin

Classifications

• H01M10/0569

  characterised by the solvents · CPC title

• H01M10/0568

  characterised by the solutes · CPC title

• H01M2300/0085

  Immobilising or gelification of electrolyte · CPC title

• H01M10/0565 Primary

  Polymeric materials, e.g. gel-type or solid-type · CPC title

• H01M2300/0037

  Mixture of solvents · CPC title