Solid polymer electrolytes for solid-state lithium metal secondary batteries

Patent metadata

Field	Value
Publication number	US-2025337008-A1
Application number	US-202118689891-A
Country	US
Kind code	A1
Filing date	May 25, 2021
Priority date	May 25, 2021
Publication date	Oct 30, 2025
Grant date	—

Abstract

A silica composition can be used in preparation of solid polymer electrolytes, wherein the silica composition has a surface-modified colloidal silica dispersion, or an evaporated product of the dispersion. A polymer electrolyte precursor composition for preparation of a solid polymer electrolyte, use of the polymer electrolyte precursor composition in preparation of a solid polymer electrolyte, a method to in-situ prepare a solid polymer electrolyte, a method to improve performance of a lithium-ion battery, a solid polymer electrolyte, an electrochemical device and a device are also described.

First claim

1 . A method for preparation of a solid polymer electrolyte, the method comprising:
preparing the solid polymer electrolyte with a silica composition wherein the silica composition comprises:
a surface-modified colloidal silica dispersion, or an evaporated product of the dispersion.

2 . The method of claim 1 , wherein the average particle size of the silica is between 3 and 50 nm.

3 . The method of claim 1 , wherein the average particle size of the silica is measured by small-angle neutron scattering.

4 . The method of claim 1 , wherein the silica composition is:
a colloidal silica dispersion comprising a) surface-modified silica particles, and b) a polymerizable solvent, which is selected from monomers, oligomers and/or prepolymers convertible to polymers by nonradical or radical reactions; or an evaporated product of a surface-modified colloidal silica dispersion comprising a) surface-modified silica particles, and b′) a non-polymerizable volatile organic solvent; wherein the average particle size of the silica is between 3 and 50 nm.

5 . The method of claim 1 , wherein the silica composition is a silica dispersion, which comprises:
aa) an external fluid phase comprising
aa1) polymerizable monomers, oligomers and/or prepolymers convertible to polymers by nonradical reactions;
and/or
aa2) polymers,
bb) a disperse phase comprising colloidal silica, and the average particle size of the silica as measured by small-angle neutron scattering (SANS) is between 3 and 50 nm at a maximum half-width of the distribution curve of 1.5d max .

6 . A polymer electrolyte precursor composition for preparation of a solid polymer electrolyte, wherein the polymer electrolyte precursor composition comprises:
A) a silica composition comprising a surface-modified colloidal silica dispersion, or an evaporated product of the dispersion; and B) the monomer of the polymer.

7 . The polymer electrolyte precursor composition of claim 6 , wherein the polymer electrolyte precursor composition further comprises:
C) a free radical initiator for polymerization reaction of the monomer; and D) a lithium salt; and optionally E) an organic solvent.

8 . The polymer electrolyte precursor composition of claim 6 , wherein the silica composition is
a colloidal silica dispersion, which comprises: a) surface-modified silica particles, and b) a polymerizable solvent, which is selected from monomers, oligomers and/or prepolymers convertible to polymers by nonradical or radical reactions; or an evaporated product of a surface-modified colloidal silica dispersion comprising: a) surface-modified silica particles, and b′) a non-polymerizable volatile organic solvent; wherein the average particle size of the silica is between 3 and 50 nm.

9 . A method for the preparation of a solid polymer electrolyte, the method comprising:
preparing the solid polymer electrolyte with the polymer electrolyte precursor composition according to claim 6 .

10 . A method to in-situ prepare a solid polymer electrolyte, wherein the method comprises:
1) injecting the polymer electrolyte precursor composition according to claim 6 into a battery case, followed by sealing; and 2) polymerizing in-situ the polymer electrolyte precursor composition.

11 . A method to improve performance of a lithium-ion battery comprising a solid polymer electrolyte, the method comprising:
preparing a solid polymer electrolyte according to the method of claim 1 .

12 . A method to prepare a solid polymer electrolyte, the method comprising: applying the polymer electrolyte precursor composition according to claim 6 .

13 . A solid polymer electrolyte, comprising silica particles, wherein
the average particle size of the silica is between 3 and 50 nm, and wherein the silica is organically surface modified wherein the surface modified silica is homogeneously dispersed in the electrolyte; or wherein the solid polymer electrolyte is prepared according to the method to prepare a solid polymer electrolyte according to claim 10 .

14 . The solid polymer electrolyte of claim 13 , wherein the amount of the silica is from 0.1 wt. % to 26 wt % based on the total weight of the solid polymer electrolyte.

15 . The solid polymer electrolyte of claim 13 , wherein the solid polymer electrolyte is prepared by crosslinking
the monomer of the polymer and a polymerizable solvent, which is selected from polymerizable monomers, oligomers and/or prepolymers convertible to polymers by nonradical reactions, the solid polymer electrolyte further comprises from 0.1-35 wt. % of an organic solvent based on the weight of the monomer of the polymer.

16 . An electrochemical device, comprising the solid polymer electrolyte of claim 13 .

17 . A device, comprising:
the electrochemical device according to claim 16 .

Assignees

• Evonik Operations Gmbh

Inventors

• Wang Feifei
• Xu Xiaochuan
• Feng Jing
• Tian Xiaowei
• Chen Minghui
• Yang Jun
• Kuai Yixi
• Lu Huichao
• Xu Zhixin

Classifications

• H01M2300/0085

  Immobilising or gelification of electrolyte · CPC title

• H01M2300/0082

  Organic polymers · CPC title

• H01M10/0525

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

• H01M50/636

  Closing or sealing filling ports, e.g. using lids · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title