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

A polymer and semi-solid technology, applied in the direction of non-aqueous electrolyte batteries, solid electrolytes, lithium batteries, etc., can solve the problem of unstable electrolyte-electrode interface, achieve stable electrolyte-electrode interface, excellent rate performance, good mechanical strength Effect

Active Publication Date: 2020-12-04
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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, preparation method and lithium metal battery
  • Semi-solid polymer electrolyte, preparation method and lithium metal battery
  • Semi-solid polymer electrolyte, preparation method and 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 the following steps: dissolving 4, 4 '-dihydroxy diphenyl sulfone in a solvent, then adding lithium borohydride, and reacting to obtain a first product; dissolving the first product and polybenzimidazole in N,N-dimethylacetamide to prepare a casting solution, casting the casting solution on a substrate, immersing the substrate in ethyl acetate to remove N, N-dimethylacetamide, and drying to obtain a polymer electrolyte membrane for later use; dissolving an acrylate monomer and an initiator in the electrolyte to prepare a precursor solution; and soaking the polymer electrolyte membrane in the precursorsolution, and carrying out polymerization reaction to prepare the semi-solid polymer electrolyte. The semi-solid polymer electrolyte provided by the invention has good mechanical strength and a stableelectrolyte 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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IPC IPC(8): C08J7/16H01M10/0565H01M10/052C08L79/04
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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