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Preparation method of polyethylene glycol modified cellulose gel polymer electrolyte for lithium ion battery

A polyethylene glycol modification, cellulose gel technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve the problems of unstable electrochemical performance, non-degradability, complex process, etc. The effect of excellent electrochemical performance, excellent cycle stability, and simple preparation method

Active Publication Date: 2021-03-30
HAINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Most of the existing gel polymer electrolytes are synthetic polymer materials, the production cost is high, the process is complicated, and it is not degradable, causing great environmental pollution
Although the existing gel polymer electrolytes prepared from natural polymers have solved the problem of environmental pollution, most of the natural polymer materials have poor compatibility and wettability with commercial electrolytes, resulting in poor electrochemical performance. Stable and short cycle life

Method used

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  • Preparation method of polyethylene glycol modified cellulose gel polymer electrolyte for lithium ion battery
  • Preparation method of polyethylene glycol modified cellulose gel polymer electrolyte for lithium ion battery
  • Preparation method of polyethylene glycol modified cellulose gel polymer electrolyte for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] S1, the preparation method of polyethylene glycol modified cellulose:

[0029] (1) Prepare sodium hydroxide, urea and deionized water alkaline solution in a mass ratio of 5:10:70, dissolve the cellulose powder, and obtain a cellulose solution with a concentration of 1%;

[0030] (2) In a water bath at 30°C, slowly add allyl chloride dropwise to the cellulose solution, the molar ratio of allyl chloride to the cellulose repeating structural unit is 9:1, and keep stirring at a stirring speed of 600r / min, and react for 24h, Then neutralize with concentrated hydrochloric acid, continuously wash and centrifuge with acetone and deionized water, put into a vacuum freeze dryer after washing and dry for 20 hours to obtain a white foamy solid;

[0031] (3) Dissolve the above-mentioned white foamy solid in the dimethyl sulfoxide solution, the preparation concentration is 3%, add polyethylene glycol methacrylate and photoinitiator I2959, polyethylene glycol methacrylate and fiber T...

Embodiment 2

[0037] S1, the preparation method of polyethylene glycol modified cellulose:

[0038] (1) Prepare sodium hydroxide, urea and deionized water alkaline solution in a mass ratio of 9:15:90, dissolve the cellulose powder, and obtain a cellulose solution with a concentration of 6%;

[0039] (2) Slowly add allyl chloride dropwise to the cellulose solution in a water bath at 50°C, the molar ratio of allyl chloride to the cellulose repeating structural unit is 9:1, and keep stirring at a stirring speed of 800r / min, react for 48h, Then neutralize with concentrated hydrochloric acid, continuously wash and centrifuge with acetone and deionized water, put it into a vacuum freeze dryer for drying for 30 hours after washing, and obtain a white foamy solid;

[0040] (3) The above-mentioned white foamy solid is dissolved in dimethyl sulfoxide solution, and the preparation concentration is 8%, adding polyethylene glycol methacrylate and photoinitiator I2959, polyethylene glycol methacrylate an...

Embodiment 3

[0046] S1, the preparation method of polyethylene glycol modified cellulose:

[0047] (1) Prepare sodium hydroxide, urea and deionized water alkaline solution in a mass ratio of 7:12:81, dissolve the cellulose powder, and obtain a cellulose solution with a concentration of 3%;

[0048] (2) In a water bath at 40°C, slowly add allyl chloride dropwise to the cellulose solution, the molar ratio of allyl chloride to the repeating structural unit of cellulose is 9:1, and keep stirring at a stirring speed of 700r / min, and react for 36h, Then neutralize with concentrated hydrochloric acid, continuously wash and centrifuge with acetone and deionized water, put it into a vacuum freeze dryer for drying for 25 hours after washing, and obtain a white foamy solid;

[0049](3) Dissolve the above-mentioned white foamy solid into the dimethyl sulfoxide solution, the preparation concentration is 3%-8%, add polyethylene glycol methacrylate and photoinitiator I2959, polyethylene glycol methacryli...

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Abstract

The invention provides a preparation method of a polyethylene glycol modified cellulose gel polymer electrolyte for a lithium ion battery. The method comprises the following steps: a preparation method of polyethylene glycol modified cellulose, a preparation method of the polyethylene glycol modified cellulose gel polymer electrolyte and an assembly method of the lithium ion battery; the cellulose-based gel polymer electrolyte with stable cycle performance is obtained by carrying out grafting reaction in a carbon-carbon double bond polymerization mode, inducing cellulose to graft polyethyleneglycol (PEG) by utilizing ultraviolet light initiation and controlling the amount of the grafted PEG in modified cellulose by changing the illumination frequency and time.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a method for preparing polyethylene glycol modified cellulose gel polymer electrolytes for lithium ion batteries. Background technique [0002] Most of the existing gel polymer electrolytes are synthetic polymer materials, the production cost is high, the process is complicated, and they are not degradable, causing great environmental pollution. Although the existing gel polymer electrolytes prepared from natural polymers have solved the problem of environmental pollution, most of the natural polymer materials have poor compatibility and wettability with commercial electrolytes, resulting in poor electrochemical performance. Stable and short cycle life. Therefore, it is an effective means to improve the comprehensive performance of lithium-ion batteries by chemically modifying natural polymers to improve their compatibility and wettability with electrolytes. The present inventi...

Claims

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Application Information

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IPC IPC(8): C08F299/02C08F2/48C08B11/20C08B11/187C08J5/18H01M10/0565H01M10/0525H01M10/058C08L55/00
CPCC08F299/028C08F2/48C08B11/20C08B11/187C08J5/18H01M10/0565H01M10/0525H01M10/058C08J2355/00Y02E60/10Y02P70/50
Inventor 余凤陈永章宏兵王安琪王思婕
Owner HAINAN UNIVERSITY
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