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Nanometer chitosan compound/fiber composite diaphragm for lithium battery and preparation method of diaphragm

A technology of nano-chitosan and lithium battery diaphragm, which is applied in the direction of battery pack components, circuits, electrical components, etc., can solve the problems of blocking feature loss, high heat and combustion, electrode short circuit, etc., to prevent the flow of electrons, equipment The effect of low investment and high electromotive force

Inactive Publication Date: 2015-09-30
SICHUAN XIDANFO LITHIUM BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] ② After this type of membrane material is heated, it has the memory characteristics of restoring the original shape of the material, and produces a large shrinkage porosity effect / resulting in the loss of the blocking feature (function) of the diaphragm material for the positive / negative electrode / electrode short circuit / generation of high heat and burn, explode

Method used

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  • Nanometer chitosan compound/fiber composite diaphragm for lithium battery and preparation method of diaphragm
  • Nanometer chitosan compound/fiber composite diaphragm for lithium battery and preparation method of diaphragm
  • Nanometer chitosan compound/fiber composite diaphragm for lithium battery and preparation method of diaphragm

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preparation example Construction

[0026] The nano-chitosan composite / fiber combination lithium battery diaphragm provided by the invention is prepared by the following method:

[0027] 1. The calculated amount of natural fibrils and the calculated amount of deionized water are forced to disperse in a strong dispersion tank at room temperature for 30 minutes, and then placed in a container at 35-40°C for 1 hour, and placed as a water-dispersed fiber base material In a dedicated dispersion tank.

[0028] 2. Use the following Chinese invention patent (patent number: ZL02113792.6) claim 4 of the calculated amount, the B material (micron chitosan sol) synthesized in the second step and the Chinese invention patent (patent number: ZL200410081608.8 ) synthetic terminal product (nano-chitosan sol), directly / disposable into the water-dispersed natural non-woven fiber base material tank, after the natural non-woven fiber is dispersed evenly, open the lower end of the water-dispersed fiber base material tank The valve q...

Embodiment 1

[0033] 1. Disperse 1.52 grams of natural fibrils and 400 grams of deionized water in a strong dispersion tank at room temperature for 30 minutes, then place them in a container at 35-40°C for 1 hour, and place them as a water-dispersed fiber base In a dedicated dispersion tank.

[0034] 2. Use 5 grams of the following Chinese invention patent (patent number: ZL02113792.6) claim 4, the B material (micron chitosan sol) synthesized in the second step and the Chinese invention patent (patent number: ZL200410081608.8) The compound (micron chitosan sol: nano chitosan sol / 3 grams: 2 grams) prepared by the synthesized end product (nano-chitosan sol) is directly / disposably put into the water-dispersed fiber base tank, and gently stirred . After the fibers are evenly dispersed, open the valve at the lower end of the water dispersion fiber base material tank, quickly drain the dispersed water in the fiber base material tank, load and combine the natural fibers of micron chitosan particl...

Embodiment 2

[0036] 1. Disperse 1.52 grams of natural fibrils and 400 grams of deionized water in a strong dispersion tank at room temperature for 30 minutes, then place them in a container at 35-40°C for 1 hour, and place them as a water-dispersed fiber base In a dedicated dispersion tank.

[0037] 2. Use 10 grams of the following Chinese invention patent (patent number: ZL02113792.6) claim 4, the B material (micron chitosan sol) synthesized in the second step and the Chinese invention patent (patent number: ZL200410081608.8) The compound (micron chitosan sol: nano chitosan sol / 5 gram: 5 gram) prepared by the synthesized terminal product (nano chitosan sol) is directly / disposably put into the water-dispersed fiber base tank, and gently stirred . After the fibers are evenly dispersed, open the valve at the lower end of the water dispersion fiber base material tank, quickly drain the dispersed water in the fiber base material tank, load and combine the natural fibers of micron chitosan par...

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Abstract

The invention belongs to the field of manufacturing of lithium batteries, and in particular relates to a nanometer chitosan compound / fiber composite diaphragm for a lithium battery and a preparation method of the diaphragm. According to the invention, an ionic polymer membrane material is formed by loading and combining of nanometer chitosan compound particles and natural non-woven fiber; the natural non-woven fiber is adopted as a support, and the nanometer chitosan compound / fiber composite diaphragm is obtained through rolling and drying (at 40-50 EG C), wherein the thickness of the nanometer chitosan compound / fiber composite diaphragm is 5-60 micrometers. The nanometer chitosan compound / fiber composite diaphragm has excellent three-dimensional network conformation, and the porosity is 80% or above; the nanometer chitosan compound / fiber composite diaphragm has no stress effect or form memory effect. The nanometer chitosan compound / fiber composite diaphragm has chemical stability, form dimensional stability, thermal stability, insulativity and excellent physical mechanical strength: fracture length(Km):4.3, and annular pressure index (kgf / 152mm / Nm / g):11.92 in electrolyte and under -40 DEG C to 150 DEG C, and has excellent adsorption affinity with the electrolyte. The nanometer chitosan compound / fiber composite diaphragm has positive charge characteristics, and can provide a free channel for positive electric lithium ions.

Description

technical field [0001] The invention belongs to the technical field of lithium battery manufacturing, and relates to a composite lithium battery composed of nano-chitosan particles and micro-chitosan particles (referred to as nano-chitosan composite) / natural non-woven fiber (referred to as fiber) Separator and method for its manufacture. Background technique [0002] The diaphragm is one of the important components of the lithium battery, and its microporous structure, physical properties, chemical properties, thermal properties, etc. are closely related to the performance of the lithium battery. Lithium batteries have a high working voltage, lithium battery diaphragm materials and highly electrochemically active positive and negative electrode materials should have excellent compatibility; and as battery diaphragm materials, they should also have excellent stability, solvent resistance, and ion conductivity. Sex, electrical insulation, heat resistance and good physical and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/431H01M50/44
CPCH01M50/449Y02E60/10
Inventor 郭小平孙清彬龚正烈龚葆红
Owner SICHUAN XIDANFO LITHIUM BATTERY
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