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Phosphate cross-linking agent and preparation method thereof, phosphate-based cross-linked gel polymer electrolyte and preparation method and application thereof

A phosphate-based and phosphate-based technology, applied in the field of gel polymer electrolytes, can solve the problems of few varieties of gel polymer electrolytes and lack of research on the influence of electrochemical performance

Active Publication Date: 2020-08-07
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Common gel polymer electrolytes used in lithium-ion batteries mainly include the following types according to different polymer matrices: polyether (PEO), polymethacrylate (PMMA), polyacrylonitrile (PAN), polybias Vinyl fluoride-hexafluoropropylene (PVDF-HFP); and there are fewer varieties of gel polymer electrolytes that can be applied to sodium-ion batteries, and the relationship between physical properties such as the influence of polymer matrix structure on the electrochemical performance of gel polymer electrolytes is even more lack of research

Method used

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  • Phosphate cross-linking agent and preparation method thereof, phosphate-based cross-linked gel polymer electrolyte and preparation method and application thereof
  • Phosphate cross-linking agent and preparation method thereof, phosphate-based cross-linked gel polymer electrolyte and preparation method and application thereof
  • Phosphate cross-linking agent and preparation method thereof, phosphate-based cross-linked gel polymer electrolyte and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Embodiment 1 (two): (phosphorus-containing crosslinking agent I and two kinds of comonomer crosslinking copolymerization)

[0071] First, taking a compound (n=1, R=H) in the general formula I as an example, 70 mg of the general formula I, 15 mg of ethyl acrylate, 26 mg of trifluoroethyl methacrylate, 2.3 mg of AIBN, and 1.00 mg of liquid electrolyte for sodium ion batteries g (the electrolyte is sodium perchlorate, the concentration is 1M, the solvent is ethylene carbonate, diethyl carbonate and fluoroethylene carbonate (1:1:0.05, v%), and the precursor solution is obtained after mixing evenly;

[0072] Then according to the conventional assembly method of sodium vanadium phosphate (NVP) sodium ion battery, for example, NVP, Super P, PVDF are ground evenly in NMP solvent by the mass ratio of 80:10:10, and it is coated on the aluminum foil rapidly, then Put it in an oven at 60° C. and dry it overnight, and then cut it with a cutting machine to obtain a positive electrode...

Embodiment 2

[0074] Embodiment 2 (two): (phosphorus-containing crosslinking agent I and two kinds of comonomer crosslinking copolymerization)

[0075] A certain compound (n=3, R=-CH 3 ) as an example, general formula I 79mg, ethyl acrylate 12mg, trifluoroethyl methacrylate 20mg, AIBN 1.8mg, sodium ion battery liquid electrolyte 1.00g (electrolyte is sodium perchlorate, concentration is 1M, solvent is ethylene carbonate ester, diethyl carbonate and fluoroethylene carbonate (1:1:0.05, v%)), and mix uniformly to obtain a precursor solution; the process of assembling a battery from the precursor solution is the same as in Example 1 (two).

Embodiment 3

[0076] Embodiment 3 (two): (phosphorus-containing crosslinking agent II and two kinds of comonomer crosslinking copolymerization)

[0077] Taking a certain compound (n=2, R=-H) in the general formula II as an example, the general formula II is 46 mg, methyl methacrylate 18 mg, trifluoroethyl methacrylate 15 mg, AIBN 1.7 mg, liquid electrolyte for sodium ions 0.72g (the electrolyte is sodium perchlorate, the concentration is 1M, the solvent is ethylene carbonate, diethyl carbonate and fluoroethylene carbonate (1: 1: 0.05, v%)) and mix uniformly to obtain the precursor solution. The process of assembling the battery from the precursor solution is the same as in Example 1 (2). The efficiency of the assembled sodium vanadium phosphate sodium ion battery was 91.9% in the first week, and the discharge capacity retention rate was 70.9% after the battery was cycled for 2800 cycles at a rate of 2C.

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Abstract

According to the invention, the safety of the battery can be improved based on introduction of phosphate into the gel polymer electrolyte, , the adjustable flexibility is improved by introduction of aPEO chain segment, and the stability and the polymerization capability are improved by introduction of acrylate; thus, further research is carried out on the basis of the prior art, the polyfunctional phosphate cross-linking agent is obtained and is applied to the preparation of the phosphate-based cross-linked gel polymer electrolyte, so the cross linking agent can be copolymerized with other functional monomers to synthesize gel polymer electrolyte; the gel polymer electrolyte has the advantages of simple and convenient preparation method, high ionic conductivity, high thermal stability andgood electrochemical stability, the assembled sodium ion battery has good cycling stability and high-temperature performance, and the phosphate-based gel polymer electrolyte with high safety is provided for quasi-solid sodium / lithium ion batteries.

Description

technical field [0001] The invention belongs to the field of gel polymer electrolytes, and in particular relates to phosphoric acid ester cross-linking agents and preparation methods thereof, phosphoric acid ester-based cross-linked gel polymer electrolytes, preparation methods and applications thereof. Background technique [0002] Lithium-ion batteries and sodium-ion batteries are widely used in various energy storage demonstration projects due to their advantages such as high energy density, high working voltage, long cycle life, small self-discharge, low pollution, and no memory effect. The electrolyte is an important part of the battery. As a medium for ion transmission, the electrolyte has an important impact on the energy density, cycle life, and safety performance of the battery. Liquid electrolyte batteries, whether lithium-ion batteries or sodium-ion batteries, have good electrochemical performance. However, the use of flammable and unstable organic liquid solvent...

Claims

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Application Information

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IPC IPC(8): C07F9/6574C07F9/09C08F130/02C08F230/02C08F220/18C08F220/22C08F220/14H01M10/0565H01M10/0525H01M10/054
CPCC07F9/65744C07F9/091H01M10/0565H01M10/0525H01M10/054C08F130/02C08F230/02H01M2300/0082C08F220/1802C08F220/22C08F220/14Y02E60/10
Inventor 郑金云冯祥明陈卫华杨亦湾李文杰孙艳可赵玉芬
Owner ZHENGZHOU UNIV
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