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Coating material for light-weight lithium ion battery diaphragm, preparation method of coating material and light-weight lithium ion battery composite diaphragm

A technology of lithium ion battery and coating material, which is applied in the field of coating material for lightweight lithium ion battery separator and its preparation, and the field of lightweight lithium ion battery composite separator, which can solve the problem of small air permeability, separator peel strength, thermal stability There is no research and other issues to achieve the effect of light and thin coating, improved wettability and stability, and broad application prospects

Active Publication Date: 2021-06-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By coating porous silica particles, the conductivity of lithium ions is improved under the premise of sacrificing gas permeability, but the peel strength and thermal stability of the modified separator have not been studied.

Method used

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  • Coating material for light-weight lithium ion battery diaphragm, preparation method of coating material and light-weight lithium ion battery composite diaphragm
  • Coating material for light-weight lithium ion battery diaphragm, preparation method of coating material and light-weight lithium ion battery composite diaphragm
  • Coating material for light-weight lithium ion battery diaphragm, preparation method of coating material and light-weight lithium ion battery composite diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This embodiment provides a coating material for a lightweight lithium-ion battery diaphragm, and its preparation method is as follows:

[0044] Disperse 160g of nanocellulose with a diameter of 50nm (d50=50nm) and a length of 2 μm in 5kg of deionized water, stir and disperse for later use; 160g of porous inorganic SiO 2 Disperse the nanofibers in 5kg of deionized water, add 0.1wt% polyvinyl alcohol (alcoholysis degree: 99mol%, viscosity: 28mPa.s), stir and homogenize at high speed for 5h, and stir and mix with the nanocellulose slurry to obtain .

[0045] Among them, porous inorganic SiO 2 The nanofibers were prepared as follows:

[0046] 10g of polyvinyl alcohol (PVA) powder was dissolved in 90g of distilled water, stirred at 80°C for 1h, then cooled at room temperature for 12h to obtain a 10wt% PVA solution; mixed 15ml of tetraethyl orthosilicate and distilled water, Stir evenly with magnetic force, and then add 100 μL of phosphoric acid (H 3 PO 4 ), stirred at r...

Embodiment 2

[0052] This embodiment provides a coating material for a lightweight lithium-ion battery diaphragm, and its preparation method is as follows:

[0053] Disperse 160g of nanocellulose with a diameter of 50nm (d50=50nm) and a length of 2 μm in 5kg of deionized water, stir and disperse for use; 160g of porous inorganic Al 2 o 3 Disperse the nanofibers in 5kg of deionized water, add 0.1wt% polyvinyl alcohol (alcoholysis degree: 99mol%, viscosity: 28mPa.s), stir and homogenize at high speed for 5h, and stir and mix with the nanocellulose slurry to obtain .

[0054] Among them, porous inorganic Al 2 o 3 The nanofibers were prepared as follows:

[0055] Dissolve 10g of polyvinyl alcohol (PVA) powder in 90g of distilled water, stir at 80°C for 1h, then cool at room temperature for 12h to obtain a 10wt% PVA solution; mix 10g of nano-alumina with 50ml of distilled water, and magnetically stir homogeneous, and then add 100 μL of phosphoric acid (H 3 PO 4 ), stirred at room temperat...

Embodiment 3

[0060] This embodiment provides a lithium-ion battery composite diaphragm, the preparation method of which is as follows:

[0061] Put 50g of alumina with a particle size of 100nm in 250ml of water, then add 250ml of 2mol / L NaOH solution, stir at 90°C for 3 hours, centrifuge, wash, and dry to obtain inorganic nanoparticles with a microporous structure;

[0062] Disperse 16g of nanocellulose with a diameter of 50nm (d50=50nm) and a length of 2 μm in 500g of deionized water, stir and disperse for use; disperse the prepared 16g of porous inorganic particles in 500g of deionized water, add 0.1wt% polyethylene Alcohol (degree of alcoholysis: 99mol%, viscosity: 28mPa.s), after high-speed stirring and homogenization for 5 hours, stir and mix with nanocellulose slurry;

[0063] Prepare a polyethylene porous membrane with a thickness of 9 μm;

[0064] The slurry prepared above was coated on both sides of the porous membrane at a coating rate of 60 m / min, and then dried in an oven at 8...

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Abstract

The invention provides a coating material for a light-weight lithium ion battery diaphragm, a preparation method of the coating material and a light-weight lithium ion battery composite diaphragm. The coating material takes water as a liquid phase component, the coating material also comprises a solid phase component, and the solid phase component comprises nanocellulose and porous inorganic nanofiber. According to the coating material for the light-weight lithium ion battery diaphragm, the porous inorganic nanofibers and the nanocellulose are combined, the coating material modifies the microporous polyolefin diaphragm, the electrolyte wettability and stability of the diaphragm can be improved on the premise that the air permeability is not sacrificed, the binding force between the obtained coating and a base membrane is high, and the coating is light and thin, thereby facilitating the transmission of lithium ions and improvement of properties such as mass energy density of the battery; therefore, the coating has a very good application prospect.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a coating material for a lightweight lithium-ion battery diaphragm, a preparation method thereof, and a lightweight lithium-ion battery composite diaphragm. Background technique [0002] In recent years, with the rapid development of electric vehicles and portable electronic products and the use of large lithium-ion power batteries, the lithium battery industry has developed rapidly. Due to the expansion of application fields and increase in demand, the shape and size of batteries are changing, and lithium secondary batteries are required to have better durability and safety than existing small batteries. The diaphragm blocks the positive and negative electrodes of the battery in the lithium-ion battery to prevent short circuit, but allows the free transmission of lithium ions. Its structure and properties are critical to the performance, cycle life and safety of li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/44H01M50/449H01M50/403H01M50/446H01M50/417H01M10/0525B82Y30/00B82Y40/00
CPCH01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 王海辉刘凯
Owner TSINGHUA UNIV
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