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Preparation method of lithium battery ceramic diaphragm

A ceramic diaphragm, lithium battery technology, applied in the direction of separators/films/diaphragms/spacer components, circuits, electrical components, etc., can solve problems affecting battery performance, uneven distribution, etc., to improve anti-deformation ability and inhibit thermal shrinkage , to avoid the effect of powder drop

Active Publication Date: 2020-07-14
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ceramic coating is prone to uneven distribution in the cross-network structure, which affects the performance of the battery.

Method used

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  • Preparation method of lithium battery ceramic diaphragm
  • Preparation method of lithium battery ceramic diaphragm
  • Preparation method of lithium battery ceramic diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] S1: Dissolve 1kg of polypropylene, 8g of sodium hexametaphosphate, 60g of acrylic acid, 15g of sodium carboxymethacrylate, and 6g of polysiloxane quaternary ammonium-16 in 500mL of acetonitrile, stir at 60°C for 5 hours, then add 450g of Silica TG6120, 150g of negatively charged silica R972 and 600g of P51 were stirred evenly to obtain a slurry precursor; the charge of positively charged silica TG6120 was 120uc / g, and the charge of negatively charged silica R972 was -160uc / g.

[0030] S2: Apply bisdiazepine crosslinking agent (wherein R is CH 2 ), the slurry precursor described in step S1; the diaphragm precursor is obtained; the coating thickness of the bisdiazacyclic crosslinking agent is 5 μm;

[0031] S3: Baking the separator precursor described in step S2 at 100° C. for 2 hours to prepare a separator.

Embodiment 2

[0033] The difference between embodiment 2 and embodiment 1 is:

[0034] S1: Dissolve 1kg of polypropylene, 4g of sodium hexametaphosphate, 90g of acrylic acid, 30g of sodium carboxymethylacrylate, and 3g of polysiloxane quaternary ammonium-16 in 500mL of acetonitrile, stir at 60°C for 5 hours, and then add 600g of Silica TG6120, 100g negatively charged silica R972 and 800g P51 were stirred evenly to obtain a slurry precursor.

Embodiment 3

[0036] The difference between embodiment 3 and embodiment 1 is:

[0037] S1: Dissolve 1kg of polypropylene, 16g of sodium hexametaphosphate, 30g of acrylic acid, 4g of sodium carboxymethacrylate, and 9g of polysiloxane quaternary ammonium-16 in 500mL of acetonitrile, stir at 60°C for 5 hours, and then add 300g of Silica TG6120, 200g negatively charged silica R972 and 400g P51 were stirred evenly to obtain a slurry precursor.

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Abstract

The invention discloses a preparation method of a lithium battery ceramic diaphragm. The method comprises the steps: matching positive silicon dioxide and negative silicon dioxide in a thermoplastic material to be better stabilized on the polymer porous film; carrying out the cross-linking of the thermoplastic material and the polymer porous film through a cross-linking agent. The battery still has strong stripping force after multiple cycles, and the problem of powder falling of ceramic slurry is avoided.

Description

technical field [0001] The invention belongs to the field of battery diaphragms, and in particular relates to a preparation method of a lithium battery ceramic diaphragm. Background technique [0002] Lithium-ion batteries have the advantages of large energy density, strong high-current discharge capacity, high rated voltage, and long cycle life. The cycle life can reach 3,000 to 5,000 times in shallow charge and discharge mode. It is widely used in many industries and fields such as digital products, electric bicycles, electric motorcycles, electric vehicles, electric energy storage, and communication energy storage. [0003] With the expansion of the application field of lithium-ion batteries, the requirements for battery safety are getting higher and higher. In order to improve the safety of the battery and improve the wettability of the separator to the electrolyte, the coated separator coated with high temperature resistant inorganic or organic particles on the surface...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M2/18H01M10/0525
CPCH01M10/0525H01M50/403H01M50/431H01M50/449H01M50/463Y02E60/10
Inventor 王成豪李正林翁星星陈朝晖贡晶晶
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD