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Preparation method of lithium ion battery diaphragm applied in wide temperature range

A lithium-ion battery, wide temperature technology, applied in the field of preparation of lithium-ion battery separator, can solve problems such as poor wettability, difficulty in battery charging and discharging, improve heat resistance and battery safety performance, improve high and low temperature capacity, and solve the problem of infiltration poor sex effect

Pending Publication Date: 2020-02-18
NANTONG BAICHUAN NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a preparation method for a lithium-ion battery separator applied in a wide temperature range, which can effectively solve the problems of poor wettability of organic polyolefin separators and PC-based electrolytes, which lead to difficult charging and discharging of batteries and obvious capacity attenuation. , while improving the safety performance of the battery and the heat resistance of the separator

Method used

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  • Preparation method of lithium ion battery diaphragm applied in wide temperature range
  • Preparation method of lithium ion battery diaphragm applied in wide temperature range
  • Preparation method of lithium ion battery diaphragm applied in wide temperature range

Examples

Experimental program
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Effect test

Embodiment 1

[0030] PVDF-co-HFP particles (Mn=130,000, Mw=400,000, sigma-Aldrich) were dried in a vacuum oven at 80°C for 2 hours and then dissolved in a high-speed mixer at 200 rpm with acetone (99.5%) (PVDF-co-HFP : acetone=1:9) to make a PVDF-co-HFP glue solution with a concentration of 10%; treat α-zirconium hydrogen phosphate powder (99.9%) in a vacuum oven at 200°C for 5 hours and then drop to room temperature, weigh 150g The treated zirconium hydrogen phosphate and 8500 g of the PVDF-co-HFP glue solution with a concentration of 10% were mixed in a high-speed mixer for 5 minutes at a speed of 1000 rpm to prepare a mixed solution. The mixed solution was evenly coated on one side of a commercially available PE separator with a mechanical coating machine, and then coated on the other side after evaporating and drying the acetone. The coating thickness on both sides was 1.5um. Thus, the diaphragm of Example 1 was prepared, wherein the ratio of zirconium hydrogen phosphate to PVDF-co-HPF ...

Embodiment 2

[0032] PVDF-co-HFP particles (Mn=110,000, Mw=455,000, sigma-Aldrich) were dried in a vacuum oven at 80°C for 2 hours and then dissolved in a high-speed mixer at 200 rpm with acetone (99.5%) (PVDF-co-HFP : acetone=1:9) to make a PVDF-co-HFP glue solution with a concentration of 10%; the α-zirconium hydrogen phosphate powder (99.9%) was treated in a vacuum oven at 200°C for 5 hours and then dropped to room temperature, and 200g was weighed The processed zirconium hydrogen phosphate and 8000 g of the PVDF-co-HFP glue with a concentration of 10% were mixed in a high-speed mixer for 5 minutes at a speed of 1000 rpm to prepare a mixed solution. The mixed solution was evenly coated on one side of a commercially available PE separator with a mechanical coating machine, and then coated on the other side after evaporating and drying the acetone. The coating thickness on both sides was 1.5um. The diaphragm of Example 1 was thus prepared, wherein the ratio of zirconium hydrogen phosphate ...

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Abstract

The invention relates to a preparation method of a lithium ion battery diaphragm applied in a wide temperature range. Zirconium hydrogen phosphate powder is dispersed in a PVDF-HFP-acetone solution with a certain concentration to be mixed at high speed for 3-10min and then evenly coated on the two sides of a commercial polyolefin diaphragm with a scraper, and the acetone evaporated and dried so asto obtain the lithium ion battery diaphragm applied in the wide temperature range. The preparation method has the advantages that: according to the preparation method of the lithium ion battery diaphragm applied in the wide temperature range, the suitable inorganic coating material is selected and the inorganic coating is evenly coated on the two sides of the conventional organic diaphragm by a simple mechanical coating method so that the problem of poor wettability of a PC-based electrolyte and an organic diaphragm can be solved and high and low temperature capacity can be improved; meanwhile, the heat resistance of the diaphragm and the safety performance of the battery can be improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a lithium ion battery diaphragm applied in a wide temperature range. Background technique [0002] Lithium-ion batteries have a history of more than 20 years since they were developed and commercialized by Sony Corporation of Japan in 1990. Due to its higher volume specific energy, weight specific energy and good environmental protection, it is gradually replacing traditional lead-acid batteries, Ni-Cd and MH-Ni batteries, and is widely used in portable 3C electronic devices such as mobile phones and notebook computers Among them, it quickly occupied a large market and developed rapidly. As the demand for smaller, lighter, and thinner electronic products has become stronger in recent years, in addition to pursuing lower prices, the pursuit of higher energy density has become a strong driving force for improving electronic product...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/431H01M50/403H01M50/411H01M50/449Y02E60/10
Inventor 蒋国强孙百亚吴晓明姜伟伟万鹏梁国成
Owner NANTONG BAICHUAN NEW MATERIAL CO LTD