Hollocellulose lithium ion battery diaphragm and preparation method thereof

A lithium-ion battery, full cellulose technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of non-renewable, non-degradable, surface hydrophobic thermal instability, etc., and achieve high ionic conductivity, pore channel Controllable structure and good thermal stability

Active Publication Date: 2017-11-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although traditional commercial polyolefin separators, such as polypropylene film and polyethylene film, have some good properties, such as good chemical stability and closed-cell property, their shortcomings are also obvious, and it is difficult to meet the current society's demand for high performance. Battery further needs
From a practical point of view, the two biggest disadvantages...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Disperse 0.8 g of nanofibrillar cellulose with a length greater than 2 μm and a diameter of 20-50 nm, 1.2 g of nanocrystalline cellulose with a length of 100-200 nm and a diameter of 5-10 nm, and 0.01 g of carboxymethyl cellulose in 2.5 L. In ionized water, control the ultrasonic dispersion time to obtain a uniformly dispersed fiber suspension. The obtained fiber suspension was prepared into a wet separator by suction filtration. After hot pressing at 10 MPa and 95° C. for 10 minutes, it was placed in a vacuum oven at 80° C. for 6 hours to obtain an all-cellulose lithium-ion battery separator.

[0023] The prepared all-cellulose lithium-ion battery separator has a thickness of 19 μm, a porosity of 57%, an electrolyte absorption rate of 458%, and an ion conductivity of 1.57 mS cm -1 , Good thermal stability, 3h dimensional change rate at 200°C is less than 0.1%.

Embodiment 2

[0025] Disperse 1.0 g of nanofibrillar cellulose with a length greater than 2 μm and a diameter of 20-50 nm, 1.0 g of nanocrystalline cellulose with a length of 100-200 nm and a diameter of 5-10 nm, and 0.01 g of carboxymethyl cellulose in 2.5 L. In ionized water, control the ultrasonic dispersion time to obtain a uniformly dispersed fiber suspension. The obtained fiber suspension was prepared into a wet separator by suction filtration. After hot pressing at 10 MPa and 95° C. for 10 minutes, it was placed in a vacuum oven at 80° C. for 6 hours to obtain an all-cellulose lithium-ion battery separator.

[0026] The prepared all-cellulose lithium-ion battery separator has a thickness of 23 μm, a porosity of 63%, an electrolyte absorption rate of 469%, and an ion conductivity of 1.62 mS cm -1 , Good thermal stability, 3h dimensional change rate at 200°C is less than 0.1%.

Embodiment 3

[0028] Disperse 1.2 g of nanofibrillar cellulose with a length greater than 2 μm and a diameter of 20-50 nm, 0.8 g of nanocrystalline cellulose with a length of 100-200 nm and a diameter of 5-10 nm, and 0.01 g of carboxymethyl cellulose in 2.5 L. In ionized water, control the ultrasonic dispersion time to obtain a uniformly dispersed fiber suspension. The obtained fiber suspension was prepared into a wet separator by suction filtration. After hot pressing at 10 MPa and 95° C. for 10 minutes, it was placed in a vacuum oven at 80° C. for 6 hours to obtain an all-cellulose lithium-ion battery separator.

[0029] The prepared all-cellulose lithium-ion battery separator has a thickness of 25 μm, a porosity of 68%, an electrolyte absorption rate of 481%, and an ion conductivity of 1.65 mS cm -1 , Good thermal stability, 3h dimensional change rate at 200°C is less than 0.1%.

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Abstract

The invention belongs to the crossing field of lithium ion battery diaphragms and biomass materials and specifically discloses a hollocellulose lithium ion battery diaphragm and a preparation method thereof. The preparation method comprises the steps: taking nano fibril cellulose, nano microcrystalline cellulose and cellulose derivative according to different mass fractions, dispersing into water and dispersing evenly by ultrasonic wave to obtain fiber suspension; preparing the fiber suspension into a wet diaphragm by a suction filtration method, hot pressing the wet diaphragm and performing vacuum drying on the wet diaphragm to obtain the hollocellulose lithium ion battery diaphragm. The prepared diaphragm is a hollocellulose completely-degradable diaphragm, the thickness of the diaphragm is 15 to 45mu m, the porosity is 45 to 80%, electrolyte absorptivity is larger than 400%, an ionic conduction rate is larger than 1.0mS cm<-1>, thermal stability is good, and a size change rate under condition of 200 DEG C for 3h is smaller than 0.1%.

Description

technical field [0001] The invention belongs to the intersection field of lithium-ion battery separators and biomass materials, and in particular relates to an all-cellulose lithium-ion battery separator and a preparation method thereof. Background technique [0002] With the rapid development of portable electronic devices, wearable devices, electric vehicles, and energy storage devices, the performance requirements of batteries are getting higher and higher. Lithium-ion batteries are widely used because of their high energy density, high operating voltage, long cycle life, small self-discharge, and no memory effect. As a key component of lithium-ion batteries, separator largely determines the performance of lithium-ion batteries. [0003] Although traditional commercial polyolefin separators, such as polypropylene film and polyethylene film, have some good characteristics, such as good chemical stability and closed-cell property, their shortcomings are also obvious, and i...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/44
CPCH01M50/411H01M50/44H01M50/403Y02E60/10
Inventor 盛杰杨仁党刘旭王阳
Owner SOUTH CHINA UNIV OF TECH
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