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Preparation method of lithium ion solid electrolyte with high ionic conductivity at room temperature

A technology of solid electrolyte and ionic conductivity, which is applied in solid electrolyte, non-aqueous electrolyte, electrolyte immobilization/gelation, etc. It can solve the problems of low room temperature electrical performance, unfavorable practical application, and low room temperature electrical performance of solid-state batteries. Achieve the effect of promoting shuttling and solving the poor ion conductivity at room temperature

Active Publication Date: 2019-09-17
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing solutions mostly use ceramics with high ionic conductivity as solid electrolyte materials, but such materials have great interface problems as lithium ion solid electrolytes and electrode materials, resulting in huge internal resistance of solid lithium ion batteries, resulting in low room temperature electrical performance; Another solution is to prepare polymer-based solid-state electrolytes by doping polymers with solid lithium salts. Although these materials have certain compatibility with electrode materials, their ionic conductivity at room temperature is low, which also leads to low room-temperature electrical conductivity of solid-state batteries. Poor performance, not conducive to practical application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment provides a method for preparing a lithium-ion solid-state electrolyte with high ionic conductivity at room temperature. The specific steps are as follows:

[0034] S1. Add 1-vinylimidazole and deionized water with a volume ratio of 1:2 into the reaction vessel, place it in a constant temperature water bath at 60°C, pass nitrogen gas into it, stir and heat, and then slowly add epichlorohydrin into the system, The volume ratio of epichlorohydrin to 1-vinylimidazole is 2:1; fully stir the reaction for 6 hours, add ether to precipitate after the reaction, and obtain a functionalized 1-vinylimidazole ionic liquid for use;

[0035] S2. Add branched polyethyleneimine with a mass ratio of 10% to the functionalized 1-vinylimidazole ionic liquid prepared in step S1, and place it at 60° C. for 4 hours to obtain polymer crosslinked 1-vinyl Imidazolium ionic liquid;

[0036] S3. The 1-vinylimidazole ionic liquid prepared in step S2 is dissolved in ethanol to form a ...

Embodiment 2

[0040] This embodiment provides a method for preparing a lithium-ion solid-state electrolyte with high ionic conductivity at room temperature. The specific steps are as follows:

[0041] S1. Add 1-vinylimidazole and deionized water with a volume ratio of 1:2 into the reaction vessel, place it in a constant temperature water bath at 40°C and feed it with nitrogen to stir and heat, then slowly add bromoacetic acid and bromoacetic acid dropwise into the system The volume ratio of 1-vinylimidazole and 1-vinylimidazole is 1:1; fully stir the reaction for 4 hours, add ether to precipitate after the reaction, and obtain a functionalized 1-vinylimidazole ionic liquid for use;

[0042] S2. Add polyethylenediamine ether with a mass ratio of 6% to the functionalized 1-vinylimidazole ionic liquid prepared in step S1, and place it at 60° C. for 4 hours to obtain polymer crosslinked 1-vinylimidazole ionic liquid;

[0043] S3. The 1-vinylimidazole ionic liquid prepared in step S2 is dissolv...

Embodiment 3

[0047] This embodiment provides a method for preparing a lithium-ion solid-state electrolyte with high ionic conductivity at room temperature. The specific steps are as follows:

[0048]S1. Add 1-vinylimidazole and deionized water with a volume ratio of 1:2 into the reaction vessel, place it in a constant temperature water bath at 25~60°C and pass in nitrogen gas to stir and heat, then slowly add bromoethylamine dropwise to the system , the volume ratio of bromoethylamine and 1-vinylimidazole is 2:1; fully stir the reaction for 4h, add diethyl ether for precipitation after the reaction is completed, and obtain a functionalized 1-vinylimidazole ionic liquid for use;

[0049] S2. Add polyglycidylmethacrylic acid ether with a mass ratio of 1% to the functionalized 1-vinylimidazole ionic liquid prepared in step S1, and place it at 60°C for 6 hours to obtain polymer crosslinked 1-ethylene Kimidazole ionic liquid;

[0050] S3. The 1-vinylimidazolium ionic liquid prepared in step S2...

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Abstract

The invention discloses a preparation method of a lithium ion solid electrolyte with high ionic conductivity at room temperature. The method comprises the following steps: functionalizing an ionic liquid, crosslinking with a polymer, reacting with lithium bis (trifluoromethylsulfonyl) imide (LiTFSI) in an ethanol solution, washing and drying to obtain a TFSI-anionic ionic liquid, then adding a ceramic solid electrolyte and a photocatalyst, stirring and dispersing, and curing to form a film, so as to obtain a solid electrolyte. According to the invention, the polymerizable ionic liquid and the ceramic electrolyte with high ionic conductivity are combined to prepare the solid electrolyte with high ionic conductivity at room temperature, the solid electrolyte has extremely high ionic conductivity at room temperature, and the electrolyte and the electrode have excellent interfacial compatibility.

Description

technical field [0001] The invention relates to the field of lithium-ion solid-state electrolytes, more specifically, to a method for preparing a lithium-ion solid-state electrolyte with high ion conductivity at room temperature. Background technique [0002] Lithium-ion batteries, as one of the most important energy storage devices, have been widely used in people's production and life since their birth. Lithium-ion batteries are considered to be very important in energy storage due to their high energy density and long service life. Has a very broad development prospects. How to further improve the energy density, capacity density and safety of batteries is currently the focus of lithium-ion battery research, and it is also a hot spot in the energy industry in recent years. Due to the use of organic liquid electrolytes in traditional lithium-ion batteries, there may be strong electrode-electrolyte side reactions, narrow applicable temperature ranges, and potential safety ...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0565H01M10/0525H01M2300/0082H01M2300/0085Y02E60/10
Inventor 廖海洋周枫林张展展杨佳李光孙晓胡晓靖朱芳薇
Owner HUNAN UNIV OF TECH
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