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Coating material for lithium ion battery diaphragm

A technology for lithium-ion batteries and coating materials, applied in coatings, battery pack components, circuits, etc., can solve the problems of poor electrolyte wettability, poor thermal stability, battery safety problems, etc., and achieve easy production. Control and promotion, the process method is simple and easy to implement, and the effect of enhancing mechanical properties

Inactive Publication Date: 2013-11-27
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, at present, no matter whether the polyolefin separator is prepared by the dry method or the wet method, the thermal stability is still not good, which causes the safety problem of the battery, and there have been many battery explosions or combustion incidents in life.
At the same time, the wettability of the separator to the electrolyte is relatively poor, resulting in poor electrical performance and cycle performance of the battery.
Moreover, due to the poor wettability of the electrolyte, the polyolefin separator has insufficient battery charge and discharge speed and cycle life, especially for large-size batteries.

Method used

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  • Coating material for lithium ion battery diaphragm
  • Coating material for lithium ion battery diaphragm
  • Coating material for lithium ion battery diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Example 1: SiO with a particle size of about 10 nm 2 Nanoparticles 3.0g, PVDF 0.9g, γ-(methacryloxy)propyltrimethoxysilane 0.3g, catechol 0.1g, acetone 200g. High-speed shearing and mixing for 2 hours, and then coating on a single-layer polypropylene diaphragm by dip coating. In the process of dip coating and film formation, the time interval between each dip coating is 240s, and the residence time after immersion is 10s. Repeat dip coating 3 times, and then dry at 50°C for 1 min. The coating amount is about 3 g / m 2 .

Embodiment 2

[0035] Example 2: TiO with a particle size of about 30 nm 2 Add 5.0 g of nanoparticles, 6.0 g of polyvinylpyrrolidone, and 0.4 g of glycolic acid to 200 g of methanol, mix ultrasonically for 0.5 h, and then form a film on a single-layer polyethylene diaphragm by dip coating. In the process of dip coating and film formation, the time interval between each dip coating is 240s, the residence time after dipping is 10s, and it is dried at 50°C for 1min. Repeat dip coating twice, then dry at 50°C for 1 min, the coating amount is about 4 g / m 2 .

Embodiment 3

[0036] Embodiment 3: the particle diameter is about 15 nm ZrO 2 Add 13.4g of nanoparticles, 11.2g of PVDF-HFP, 1.6g of diethanolamine, and 0.8g of water into a mixed solvent of 60.0g of methanol and 100.0g of acetone, mix ultrasonically for 0.5h, and then Pick A film was formed on a single-layer polyethylene separator by dip coating. The time interval between each dip coating is 240s, the residence time after immersion is 10s, and it is dried at 50°C for 2 minutes. Repeat the dip coating twice, then dry at 50°C for 1 min, the coating amount is about 3 g / m 2 .

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Abstract

The invention relates to a coating material for a lithium ion battery diaphragm. According to the invention, an organic-inorganic composite coating system is adopted, an inorganic ingredient and an organic ingredient are uniformly dispersed to form the coating material, and the coating material has good malleability on the surface of a polyolefin material and can form an uniform organic-inorganic composite coating on the outer surface of the lithium ion battery diaphragm and on the inner surfaces of tunnels after curing. Through coating of the coating material, a porous structure of the polyolefin diaphragm is kept, and electrolyte solution wellability and conservation rate, electrochemical stability, mechanical strength and heat stability of the diaphragm are improved. The diaphragm coated with the coating material can improve cycling stability, safety and a service life of the lithium ion battery.

Description

technical field [0001] The invention relates to a coating material for a lithium-ion battery diaphragm. Background technique [0002] my country is now a major battery manufacturing country in the world, ranking first in the world in both battery output and export volume. The industrialization of lithium-ion batteries in my country began in late 1997 and reached 800 million in 2004, and its market share in the global market soared to 38%, second only to Japan. From 2005 to 2008, my country's global market share of lithium-ion batteries remained stable at around 34%. [0003] Lithium-ion batteries are mainly composed of four parts, namely positive electrode material, negative electrode material, separator and electrolyte. [0004] In the structure of lithium batteries, the separator is one of the key inner components. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and sa...

Claims

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Application Information

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IPC IPC(8): C09D1/00C09D127/16C09D133/12C09D139/06C09D179/08C09D129/04C09D139/00C09D133/02C09D7/12H01M2/16H01M50/446H01M50/449
CPCY02E60/12Y02E60/10
Inventor 施利毅袁帅王竹仪赵尹张美红
Owner SHANGHAI UNIV
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