Lithium single ion conduction polymer electrolyte based on functionalized lithium borate

A technology for synthesizing lithium borate and single ions, applied in solid electrolytes, non-aqueous electrolytes, electrolyte immobilization/gelation, etc., can solve the problems of poor mechanical strength and film-forming properties, low room temperature conductivity, and complicated synthesis steps. , to achieve stable cycle life, high room temperature conductivity, and high lithium ion migration number.

Active Publication Date: 2017-07-07
SUN YAT SEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, there are a lot of research work on lithium single-ion conductive polymer electrolytes at home and abroad, but there are many problems such as cumbersome synthesis steps, low room temperature conductivity, poor mechanical strength and film-forming performance.

Method used

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  • Lithium single ion conduction polymer electrolyte based on functionalized lithium borate
  • Lithium single ion conduction polymer electrolyte based on functionalized lithium borate
  • Lithium single ion conduction polymer electrolyte based on functionalized lithium borate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0022] Embodiment 1-5 is the preparation of lithium single-ion conductive polymer electrolyte

Embodiment 1

[0023] Embodiment 1: Preparation (electrolyte 1) based on allyl malonate lithium borate gel electrolyte (propylene carbonate is a plasticizer)

[0024] The following operations were all carried out in a glove box. Lithium allylmalonate borate (LiBAMB) (5.00mmol, 1.50g) and pentaerythritol tetra-3-mercaptopropionate (2.50mmol, 0.8540mL) were added to a small glass bottle , DMPA (0.50mmol, 0.1281g) and propylene carbonate 5.0mL. After stirring and dissolving, pour it into a rectangular polytetrafluoroethylene mold (7*10cm), put it into a sealed bag, take out the glove box and place it on a horizontal table, and irradiate it with 365nm ultraviolet light for 2 hours. Then put it into a glove box and use a hole cutter with a diameter of 15mm to cut out a film with a diameter of 15mm, and install it in a button cell to measure cross-linking impedance, cyclic voltammetry, and ion transfer number.

Embodiment 2

[0025] Embodiment 2: Preparation (electrolyte 2) based on allyl malonate lithium borate gel electrolyte (diethyl carbonate is solvent and plasticizer)

[0026] A polymer electrolyte was prepared in the same manner as in Example 1 except that the solvent and plasticizer were changed to diethyl carbonate.

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PUM

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Abstract

The invention discloses a lithium single ion conduction polymer electrolyte based on functionalized lithium borate. A double-bond-containing functionalized lithium borate and a sulfydryl-containing compound are subjected to an alkene-sulfydryl click reaction, or the double-bond-containing functionalized lithium borate and the sulfydryl-containing compound and a double-bond-containing polyether are subjected to a poly-alkene-sulfydryl click reaction to prepare a linear or network-shaped all-solid-state or gel catalyst. The lithium single ion conduction polymer electrolyte prepared by the invention has the advantages of simple and easily implemented synthesis, low-cost and easily available raw materials, high room-temperature conductivity, high lithium ion mobility, wide electrochemical window, and the like; and a lithium battery assembled by the electrolyte provided by the invention has high safety, high rate capability, long cycle life and stability.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery electrolytes, and relates to a lithium single-ion conductive polymer electrolyte and a preparation method thereof. More specifically, it relates to a lithium single-ion conducting polymer electrolyte based on a functionalized lithium borate salt. Background technique [0002] With the rapid development of smart phones, smart mobile devices, electric vehicles, and hybrid vehicles, the energy density and safety performance requirements of lithium batteries are getting higher and higher. As an important part of lithium batteries, electrolyte has a great influence on battery performance. An ideal electrolyte requires high ionic conductivity, high lithium ion migration number, wide electrochemical window, good thermal stability, high mechanical strength, and good safety. [0003] Traditional lithium-ion batteries use liquid electrolytes, usually composed of organic liquids and lithium salts. And t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M2/16H01M4/62H01M10/42H01M10/0525C08F130/06C08F230/06C08F222/20H01M50/411
CPCH01M4/622H01M10/0525H01M10/0565H01M10/4235C08F130/06C08F222/20C08F230/06H01M2300/0082H01M2300/0085C08F222/1063H01M50/411Y02E60/10
Inventor 肖敏邓魁荣孟跃中杨凯钟雷王拴紧韩东梅任山黄旭霞
Owner SUN YAT SEN UNIV
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