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Preparation method of bacterial cellulose gel polymer electrolyte of lithium battery

A bacterial cellulose and gel polymer technology, which is applied in the field of polymer electrolyte preparation, can solve the problems of low ionic conductivity and poor mechanical properties, and achieve the effects of simple preparation steps, good mechanical properties, and improved economic value

Active Publication Date: 2016-11-09
周佰芹
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention: Aiming at the disadvantages of low ionic conductivity and poor mechanical properties due to the need to add plasticizers in the preparation process of traditional gel polymer electrolytes, it provides a watermelon rind that is cooked with no Stir and mix with water, calcium chloride, etc., and then use yeast to cooperate with microorganisms in the biogas liquid to ferment together. The bacterial cellulose film on the surface of the fermentation liquid is taken, rinsed, soaked in alkali, kept warm in a water bath, and filtered to obtain a membrane, and the membrane is treated in a water bath. , freezing, and second thawing, mixing with polyethylene glycol dimethyl ether and lithium perchlorate, and impregnating it under vacuum conditions to obtain a lithium battery bacterial cellulose gel polymer electrolyte method
The invention has simple preparation steps, fully utilizes bacterial cellulose to prepare gel polymer electrolyte, does not need to add plasticizer, is highly targeted, and effectively solves the problems of low ion conductivity and poor mechanical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] First, weigh 300g of fresh watermelon rind, add it to a steamer filled with 1L of water, heat it to boiling, cook for 20min in a boiling state, take out the watermelon rind, wait for it to cool down to room temperature naturally, and add 1L of deionized water to the steamer. In the fermenter, add 0.3g anhydrous calcium chloride and 0.2g potassium dihydrogen phosphate in sequence, add dropwise a citric acid solution with a mass concentration of 6%, adjust the pH to 6.2, start the fermenter stirrer, and stir at a speed of 300r / min Mix for 10 minutes; after the stirring is completed, add 2g of yeast powder and 10mL of biogas liquid in turn, stir and mix with a glass rod for 10 minutes, start the heater of the fermenter, heat up to 30°C, let it stand for 5 days at a constant temperature and seal it for fermentation, and take out the fermented liquid with tweezers The surface layer of the cellulose film was rinsed with deionized water for 3 times, then immersed in a beaker fi...

example 2

[0019] First, weigh 400g of fresh watermelon rind, add it to a steamer filled with 2L of water, heat to boiling, cook for 25min under boiling state, take out the watermelon rind, and after it cools down to room temperature naturally, add 2L of deionized water into a sealed steamer. In the fermenter, add 0.4g anhydrous calcium chloride and 0.3g potassium dihydrogen phosphate in sequence, add dropwise a citric acid solution with a mass concentration of 7%, adjust the pH to 6.3, start the fermenter stirrer, and stir at a speed of 350r / min Mix for 13 minutes; after the stirring is completed, add 3g of yeast powder and 13mL of biogas liquid in turn, stir and mix with a glass rod for 13 minutes, start the heater of the fermenter, heat up to 33°C, let it stand for 6 days at a constant temperature and seal it for fermentation, and take out the fermented liquid with tweezers The surface layer of the cellulose film was rinsed with deionized water for 4 times, then immersed in a beaker fi...

example 3

[0022] First, weigh 500g of fresh watermelon rind, add it to a steamer filled with 2L of water, heat it to boiling, cook for 30min under boiling condition, take out the watermelon rind, and after it cools down to room temperature naturally, add it into a steamer filled with 2L of deionized water. In the fermenter, add 0.5g anhydrous calcium chloride and 0.4g potassium dihydrogen phosphate in sequence, add dropwise a citric acid solution with a mass concentration of 8%, adjust the pH to 6.4, start the fermenter stirrer, and stir at a speed of 400r / min Mix for 15 minutes; after the stirring is completed, add 4g of yeast powder and 15mL of biogas liquid in turn, stir and mix with a glass rod for 15 minutes, then start the heater of the fermenter, heat up to 35°C, let it stand for 7 days at a constant temperature and seal it for fermentation, and take out the fermented liquid with tweezers The cellulose film on the surface layer was rinsed with deionized water for 5 times, then imm...

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Abstract

The invention discloses a preparation method of bacterial cellulose gel polymer electrolyte of a lithium battery and belongs to the technical field of preparation of polymer electrolyte. The preparation method comprises the following steps: after cooking watermelon peels, stirring and mixing the watermelon peels with anhydrous calcium chloride and the like; commonly carrying out fermentation by utilizing yeast and microorganisms in biogas liquid; taking a bacterial cellulose membrane on the surface of fermented liquid; washing, carrying out alkali leaching and water-bath heat preservation, and filtering to obtain a membrane; carrying out water-bath treatment, freezing and secondary unfreezing on the membrane; then mixing the membrane with polyethylene glycol dimethyl ether and lithium perchlorate; and under a vacuum condition, impregnating to obtain the bacterial cellulose gel polymer electrolyte of the lithium battery. The preparation method is simple in preparation steps; the gel polymer electrolyte is prepared by sufficiently utilizing bacterial cellulose; and a plasticizer does not need to be added and the pertinence is strong; and the problems that the ion conductivity is low and the mechanical performance is poor are effectively solved.

Description

technical field [0001] The invention relates to a method for preparing a lithium battery bacterial cellulose gel polymer electrolyte, belonging to the technical field of polymer electrolyte preparation. Background technique [0002] In recent years, lithium batteries have received widespread attention. As a high-energy and environmentally friendly battery, it has the advantages of high working voltage, large specific energy, fast charge and discharge, and long cycle life. Therefore, it has been widely used in mobile phones, notebook computers and Electronic products such as digital cameras. Cellulose is the most widely distributed and abundant renewable resource in nature. It has many advantages such as degradability, film-forming property, non-toxicity, good compatibility, stable structure and excellent mechanical properties. , industrial processing, construction, oil field chemistry, medicine and electronic products and other fields are used. The application of cellulose...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 佟明盛海丰许博伟
Owner 周佰芹
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