Slurry for coating isolating membrane of lithium ion battery, isolating membrane and preparation method of slurry

Abstract

The invention provides slurry for coating an isolating membrane of a lithium ion battery. The slurry comprises the following components: nano-grade aluminum oxide, carboxylic butadiene-styrene latex, aluminum fluoride, N-methylpyrrolidone, vinyl pyrrolidinone, divinyl carbonate, an aqueous fluorine flatting agent, aqueous fluoride dispersing liquid, an associated thickening agent and the balance being deionized water. The invention further provides a preparation of the slurry. By virtue of combination of the components in special ratios, the slurry for coating the isolating membrane of the lithium ion battery has excellent properties of resisting high temperature up to 250 DEG C and low temperature up to -80 DEG C, and meanwhile, by virtue of spherical ultrasonic dispersion treatment used when the slurry is prepared and the special process that the basic isolating membrane is coated with the slurry, the prepared isolating membrane has the characteristics that the coating is good in molecular dispersivity, uniform in thickness and uniform in electrical property.

Description

technical field [0001] The invention relates to a coating slurry for a separator of a lithium ion battery, a separator and a preparation method thereof. Background technique [0002] Since the commercial use of lithium-ion batteries in the 1990s, they have rapidly developed due to their advantages such as high specific energy, high battery voltage, wide operating temperature range, long storage life, no memory effect, small self-discharge rate, and fast charge and discharge. Developed, at present, lithium-ion batteries have been widely used in electronic products such as mobile phones, notebook computers, digital cameras, etc., and are gradually used as power batteries in electric bicycles, model airplanes, and electric vehicles. During the use of lithium-ion batteries, it has always been the focus of research by battery scientists to take into account the performance at high and low temperatures. Generally speaking, batteries with good performance at room temperature can on...

AI Technical Summary

Problems solved by technology

During the use of lithium-ion batteries, it has always been the focus of research by battery scientists to take into account the performance at high and low temperatures. Generally speaking, batteries with good performance at room temperature can only take into account good low-temperature performance or high-temperature performance, which is difficult. Achieve both high and low temperature

[0003] At present, the separators used in lithium batteries on the market are generally coated with aluminum oxide and PVDF. The high temperature resistance limit is 150 degrees Celsius, the low temperature resistance is only about zero degrees Celsius, and the high and low temperature tolerance is insufficient.

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