Polymer electrolyte, preparation method and lithium metal battery

A polymer and electrolyte technology, applied in non-aqueous electrolyte batteries, lithium batteries, solid electrolytes, etc., can solve safety problems and other problems, and achieve the effects of promoting dissociation, growth inhibition, and excellent rate performance

Active Publication Date: 2020-11-03
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 polymer electrolyte and its preparation method and lithium metal battery, which can effectively inhibit the growth of lithium dendrites to solve the safety problems existing in existing batteries

Method used

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  • Polymer electrolyte, preparation method and lithium metal battery
  • Polymer electrolyte, preparation method and lithium metal battery
  • Polymer electrolyte, preparation method and lithium metal battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The invention provides a method for preparing a polymer electrolyte, comprising the following steps:

[0042] S1. Dissolving 4,4'-dihydroxydiphenyl sulfone in the first solvent, then adding lithium borohydride, and obtaining the first product after reaction;

[0043] 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, after drying to obtain a polymer electrolyte membrane, and then immerse the polymer electrolyte membrane in a second solvent to obtain a polymer electrolyte.

[0044] It should be noted that in the examples of this application, 10 mmol of 4,4'-dihydroxydiphenyl sulfone weighed in a two-necked flask was added to S1, and tetrahydrofuran (THF) solution was added, stirred until it was completely dissolved, and then dripped Add 5 mmol of lithium borohydride (L...

Embodiment 2

[0052] Same as Example 1, the difference is that the mass ratio of polybenzimidazole (PBI) to the first product (Li-PSDB) is 1:1.

Embodiment 3

[0054] 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 polymer electrolyte and a preparation method thereof, and a lithium metal battery, the preparation method of the polymer electrolyte comprises the following steps: dissolving4,4'-dihydroxy diphenyl sulfone in a first solvent, then adding lithium borohydride, and reacting to obtain a first product; dissolving the first product and polybenzimidazole in N,N-dimethylacetamideto prepare a casting solution, casting the casting solution on a substrate, immersing the substrate in ethyl acetate to remove N,N-dimethylacetamide, drying the substrate to obtain a polymer electrolyte membrane, and immersing the polymer electrolyte membrane in a second solvent to obtain a polymer electrolyte; the polymer electrolyte prepared by the invention not only can promote dissociation ofLi+, but also shows high limitation on anion migration, and in addition, in a repeated Li stripping / electroplating test process, the growth of lithium dendrites is obviously inhibited.

Description

technical field [0001] The invention relates to the technical field of lithium metal batteries, in particular to a 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 advantages of 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), lithium metal batteries (LMBs ) have higher energy density than conventional Li-ion batteries, making them potential candidates for advanced energy storage systems. However, lithium metal batteries (LMBs) face severe dendrite growth issues, which cause serious safety concerns and hinder their practical application. [0003] Single-ion gel polymer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052C08G65/40
CPCC08G65/4056C08G65/4068H01M10/052H01M10/0565H01M2300/0082Y02E60/10
Inventor 张运丰王佳颖霍士康何阳程寒松
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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