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Method for manufacturing gel polymer electrolyte and gel-state battery through in-situ ring-opening polymerization

A technology of gel polymer and ring-opening polymerization, which is applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems that affect the battery rate performance, battery capacity, high impedance at the interface, etc., to improve cycle and safety performance, and prevent corrosion Effect

Inactive Publication Date: 2019-12-31
GUANGDONG TEAMGIANT NEW ENERGY TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wettability of gel and electrode material particles is not as good as that of solid-liquid contact, which leads to high impedance at the interface, which affects the rate performance and capacity of the battery.

Method used

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  • Method for manufacturing gel polymer electrolyte and gel-state battery through in-situ ring-opening polymerization
  • Method for manufacturing gel polymer electrolyte and gel-state battery through in-situ ring-opening polymerization

Examples

Experimental program
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Effect test

Embodiment 1

[0028] This embodiment is all carried out under an argon atmosphere. A certain amount of 1,3 dioxolane (DOL) solvent is added to a glass beaker, and then 1 mol / L of bis(trifluoromethylsulfonyl)imide lithium is added successively. (LiTFSI), 0.1mol / L lithium difluorooxalate borate (LiDFOB), stir evenly to obtain a precursor solution; then inject the precursor solution into the glass fiber, and assemble a stainless steel / / stainless steel button battery, and put the battery at room temperature After standing for 10 days, the in-situ ring-opening polymerization reaction was sufficient, and the lithium ion conductivity of the gel electrolyte at room temperature was measured to be 1.83×10 -6 S / cm.

Embodiment 2

[0030] This embodiment is all carried out under an argon atmosphere. A certain amount of 1,3 dioxolane (DOL) solvent is added to a glass beaker, and then 1 mol / L of bis(trifluoromethylsulfonyl)imide lithium is added successively. (LiTFSI), 0.3mol / L lithium difluorooxalate borate (LiDFOB), stir well to obtain a precursor solution; then inject the precursor solution into the glass fiber, and assemble a stainless steel / / stainless steel button battery, and put the battery at room temperature After standing for 5 days, until the in-situ ring-opening polymerization reaction is sufficient, the lithium ion conductivity of the gel electrolyte at room temperature is measured to be 3.29×10 -6 S / cm.

Embodiment 3

[0032] This embodiment is all carried out under an argon atmosphere. A certain amount of 1,3 dioxolane (DOL) solvent is added to a glass beaker, and then 1 mol / L of bis(trifluoromethylsulfonyl)imide lithium is added successively. (LiTFSI), 0.5mol / L lithium difluorooxalate borate (LiDFOB), stir well to obtain a precursor solution; then inject the precursor solution into the glass fiber, and assemble a stainless steel / / stainless steel button battery, and put the battery at room temperature After standing for 5 days, the in-situ ring-opening polymerization reaction was sufficient, and the lithium ion conductivity of the gel electrolyte at room temperature was measured to be 2.16×10 -6 S / cm.

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Abstract

The invention discloses a method for manufacturing a gel polymer electrolyte and a gel-state battery through in-situ ring-opening polymerization. The method comprises the following steps of (1) uniformly dispersing lithium salt in a 1, 3 dioxolane (DOL) solvent in an argon atmosphere, then adding a lithium salt additive and a plasticizer, and uniformly dispersing to obtain a precursor solution; (2) injecting the precursor solution into a glass fiber / polypropylene diaphragm according to an assembling method of a liquid lithium battery, and assembling a button battery; and (3) standing or heating for a long time, carrying out DOL in-situ ring-opening polymerization and forming a polymeric-state gel electrolyte (Poly-DOL) in the battery, and then obtaining a gel electrolyte battery. In the invention, a ring-opening polymerization reaction of an epoxide DOL solvent is successfully induced through lithium difluoroborate, manufacturing of the gel polymer electrolyte and the gel state batteryis realized in situ, and problems of poor physical contact between the gel electrolyte and an electrode material and a relatively large interface impedance are solved.

Description

technical field [0001] The invention relates to the field of gel polymer electrolytes, in particular to a method for preparing gel polymer electrolytes and gel state batteries by in-situ ring-opening polymerization. Background technique [0002] With the continuous advancement of lithium-ion battery technology, lithium battery products are also developing in the direction of high energy density and long battery life, but the safety performance and cycle performance of batteries are facing greater challenges. At present, commercial lithium-ion batteries usually use organic electrolytes that are flammable, volatile, corrosive, and leaky. When they are matched with positive and negative materials with high specific volume, a series of side reactions will occur, and thermal runaway behavior will also occur. more likely to happen. Gel electrolytes usually have better electrochemical stability and flame retardancy, and their mechanical strength also helps to inhibit the growth of...

Claims

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Application Information

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IPC IPC(8): H01M10/0565C08G65/16
CPCC08G65/16H01M10/0565Y02E60/10
Inventor 蔡比亚王强刘琦李宝华
Owner GUANGDONG TEAMGIANT NEW ENERGY TECH CORP
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