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Polymer lithium ion battery diaphragm and preparation method thereof

A technology for lithium-ion batteries and polymers, applied in secondary batteries, battery components, circuits, etc., can solve the problem of enhancing the comprehensive performance of polymer lithium-ion battery diaphragms, the contradiction between ion conductivity and mechanical properties, and low-temperature conductivity And other issues

Inactive Publication Date: 2014-06-18
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main problems of polymer separators are: the contradiction between ionic conductivity and mechanical properties, poor wettability, low low temperature conductivity and weak cycle stability, etc.
At present, there are no reports or patents involving the use of bacterial cellulose to enhance the comprehensive performance of polymer lithium-ion battery separators.

Method used

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  • Polymer lithium ion battery diaphragm and preparation method thereof
  • Polymer lithium ion battery diaphragm and preparation method thereof
  • Polymer lithium ion battery diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Bacterial Cellulose Grafted Carbon Nanotube Composite Modified Polyvinylidene Fluoride Separator

[0038] 1) Put 10 mg of carbon nanotubes into a 250 mL round bottom flask, add 60 mL of a mixture of concentrated nitric acid and concentrated sulfuric acid (the volume ratio of concentrated nitric acid to concentrated sulfuric acid is 1:3), sonicate for 1 h, and then pack A good reflux condensation, collection and stirring device, heating and stirring and reflux at a constant temperature of 80°C. After 48 hours, it was naturally cooled to room temperature, and the obtained black solution was filtered, and the black powder on the filter paper was washed repeatedly with deionized water until the pH value was 7. Then put the carbon nanotubes on the filter paper into a vacuum oven at 80°C to dry for 24 hours, then dissolve the carbon nanotubes in 50 mL of dimethylacetamide, and disperse them ultrasonically for 1 hour to obtain a carbon nanotube solution;

[0039] 2) At the same...

Embodiment 2

[0043] Bacterial Cellulose Grafted Carbon Nanotube Composite Modified Polyacrylonitrile Separator

[0044] 1) Put 5 mg of carbon nanotubes into a 250 mL round bottom flask, add 40 mL of a mixture of concentrated nitric acid and concentrated sulfuric acid (the volume ratio of concentrated nitric acid to concentrated sulfuric acid is 1:3), and prepare according to the steps in Example 1 50mL carbon nanotube dimethylacetamide solution, and ultrasonically disperse for 1h;

[0045] 2) At the same time, take 2g of lithium chloride dried in vacuum at 150°C and add 50mL of dimethylacetamide, heat in an oil bath at 80°C to dissolve completely, then introduce 0.5g of activated bacterial cellulose, and continue heating at 80°C Stir until completely dissolved;

[0046] 3) After that, mix the above two solutions that are uniformly dissolved and dispersed, and continue heating and stirring to achieve uniform dissolution. After microwave radiation for 10 minutes, add 18g of polyacrylonitril...

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Abstract

The invention belongs to the field of a lithium ion battery, and particularly relates to a polymer diaphragm material for a lithium ion battery and a preparation method of the polymer diaphragm material. The preparation method comprises the following steps of enabling a carbon nanotube with carboxyl on the surface to have radiation-induced graft copolymerization with bacterial cellulose solution, then directly adding the polymer, dissolving and homogenizing the polymer to obtain a membrane polymer solution, and finally preparing the polymer lithium ion battery diaphragm compositely modified by bacterial cellulose which is grafted with the carbon nanotube through a solution membrane casting method. The invention provides the polymer lithium ion battery diaphragm compositely modified by utilizing bacterial cellulose to be grafted with the carbon nanotube and a preparation method of the polymer diaphragm material, and the obtained polymer diaphragm has the advantages of good ion conductivity, high liquid absorption rate and large mechanical strength.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a polymer separator material for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new type of secondary rechargeable battery. Compared with the currently used alkaline / manganese battery, lead / acid battery and Ni-MH battery, lithium-ion battery has high open circuit voltage, high specific capacity, long cycle life, and safety. Good performance, low self-discharge rate, no memory effect, etc. Especially with the popularization of mobile communication products and the rapid development of portable electronic products, the requirements for the performance of rechargeable batteries are constantly improving. The development of lithium-ion batteries has become a new direction and has attracted widespread attention. [0003] Lithium-ion batteries are mainly composed of positive electrode, negative electrode, electrolyte a...

Claims

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Application Information

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IPC IPC(8): H01M2/16C08L27/16C08L33/20C08L87/00C08G83/00H01M50/403H01M50/44H01M50/443H01M50/489H01M50/497
CPCC08G83/001C08J5/18C08J9/28H01M10/0525C08J2333/20C08J2327/16H01M50/403H01M50/411H01M50/44Y02E60/10
Inventor 祝瑜张召才朱建平冯春花管学茂
Owner HENAN POLYTECHNIC UNIV
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