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Semi-solid polymer electrolyte and preparation method, lithium metal battery

A polymer, semi-solid technology, used in non-aqueous electrolyte batteries, solid electrolytes, lithium batteries, etc., can solve problems such as electrolyte-electrode interface instability, and achieve excellent cycle performance, excellent rate performance, and high ionic conductivity. Effect

Active Publication Date: 2021-04-27
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention proposes a semi-solid polymer electrolyte and its preparation method and lithium metal battery, which have good mechanical strength and stable electrolyte-electrode interface to solve the unstable electrolyte-electrode interface existing in the prior art technical issues

Method used

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  • Semi-solid polymer electrolyte and preparation method, lithium metal battery
  • Semi-solid polymer electrolyte and preparation method, lithium metal battery
  • Semi-solid polymer electrolyte and preparation method, lithium metal battery

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The invention provides a method for preparing a semi-solid polymer electrolyte, comprising the following steps:

[0041] S1. Dissolving 4,4'-dihydroxydiphenyl sulfone in a solvent, then adding lithium borohydride, and obtaining the first product after reaction;

[0042] S2. Dissolving the first product and polybenzimidazole in N,N dimethylacetamide to prepare a casting solution, casting the casting solution on the substrate, and then immersing the substrate in ethyl acetate to remove N,N dimethylacetamide Base acetamide, obtain polymer electrolyte membrane after drying, standby;

[0043] S3, dissolving the acrylate monomer and the initiator in the electrolyte to prepare a precursor solution;

[0044] S4, immersing the polymer electrolyte membrane in the precursor liquid, performing a polymerization reaction and preparing a semi-solid polymer electrolyte.

[0045] It should be noted that in the examples of this application, 10 mmol of 4,4'-dihydroxydiphenyl sulfone wei...

Embodiment 2

[0057] Same as Example 1, the difference is that the mass ratio of polybenzimidazole (PBI) to the first product (Li-PSDB) is 1:2.

Embodiment 3

[0059] Same as Example 1, the difference is that the mass ratio of polybenzimidazole (PBI) to the first product (Li-PSDB) is 2:1.

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Abstract

The invention provides a semi-solid polymer electrolyte and a preparation method thereof, and a lithium metal battery. The preparation method of the semi-solid polymer electrolyte comprises: dissolving 4,4'-dihydroxydiphenyl sulfone in a solvent, and then adding boron Lithium hydride, the first product is obtained after the reaction; the first product and polybenzimidazole are dissolved in N,N dimethylacetamide to prepare a casting solution, and the casting solution is cast on the substrate, and then the substrate is immersed in ethyl acetate Remove N, N dimethylacetamide from the ester, and obtain a polymer electrolyte membrane after drying, and set aside; dissolve the acrylate monomer and initiator in the electrolyte to prepare a precursor; soak the polymer electrolyte membrane in the precursor In the liquid, the polymerization reaction is carried out and the semi-solid polymer electrolyte is prepared. The semi-solid polymer electrolyte of the present invention has good mechanical strength and stable electrolyte-electrode interface.

Description

technical field [0001] The invention relates to the technical field of lithium metal batteries, in particular to a semi-solid polymer electrolyte, a preparation method thereof, and a lithium metal battery. Background technique [0002] With high expectations for energy density in cutting-edge consumer electronics, electric vehicles, and smart grids, the development of energy storage systems with ultra-high energy density is strongly considered. Because lithium metal has the highest theoretical specific capacity (3860mA h g -1 ), low density (0.59g cm -3 ) and the lowest redox potential (-3.04V vs. standard hydrogen potential), therefore, lithium metal batteries (LMBs) have higher energy densities than traditional lithium-ion batteries, and have become promising candidates for advanced energy storage systems. potential candidates. However, lithium metal batteries (LMBs) face severe dendrite growth issues, which cause serious safety concerns and hinder their practical appli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565C08J7/16H01M10/052C08L79/04
CPCC08J7/16C08J2379/04H01M10/052H01M10/0565H01M2300/0082Y02E60/10
Inventor 张运丰王佳颖何阳霍士康程寒松
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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