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A method for dry in-situ synthesis of diaphragm, its product and product use

An in-situ synthesis and dry process technology, applied to structural parts, electrical components, battery pack parts, etc., can solve the problems of increasing cost and increasing production difficulty, and achieve low preparation cost, good mechanical stability, and high ion conductivity rate effect

Active Publication Date: 2022-04-26
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This undoubtedly increases the production difficulty of the whole preparation process and also increases the cost.

Method used

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  • A method for dry in-situ synthesis of diaphragm, its product and product use
  • A method for dry in-situ synthesis of diaphragm, its product and product use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Methods for dry in situ synthesis of membranes:

[0071] (1) Combine 4.5g of polymer PAN powder and 0.05g of bis-25 (2,5-dimethyl-2,5-di-tert-butylperoxyhexane, solid cross-linking agent), and stir at a high speed of 20000rpm Mix for 5 minutes to fully mix the two; then add PTFE 0.25g, stir and disperse at a stirring speed of 2000rpm for 5min to fully mix the polymer powder and solid crosslinking agent; Stirring, using pulse stirring, stirring time 1min, rest time 1min, total stirring time 20min, to obtain dry powder;

[0072] Based on the mass of dry powder as 100%, it includes the following components:

[0073] PAN powder 93.8%

[0074] Solid crosslinking agent 1.0%

[0075] PTFE 5.2%

[0076] (2) Take a certain amount of dry powder and put it on the rolling equipment with the set temperature of the rollers at 150°C (the equipment has been preheated and the temperature is stable at about 150°C), with a roller gap of 10μm and a speed of 5rpm Rolling speed of 11 μm...

Embodiment 2

[0079] The difference between this embodiment and Embodiment 1 is that the PAN in Embodiment 1 is replaced by PI of equal quality, and other parameters and conditions are completely the same as those in Embodiment 1.

Embodiment 3

[0081] The difference between this embodiment and Embodiment 1 is that the PAN in Embodiment 1 is replaced by PPC of equal quality, and other parameters and conditions are completely the same as those in Embodiment 1.

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Abstract

The present invention relates to a method for dry in-situ synthesis of membranes, its products and product applications; the method includes premixing the first polymer and the fibrous polymer or mixing the first polymer, a solid crosslinking agent and a fibrous polymer The fibrous polymer is premixed, and the fibrous polymer is drawn into fibers under the action of shear force, followed by heat-pressing treatment and cross-linking to obtain a separator; the separator obtained by the method is a network structure, which has abundant Pores, good thermal stability, mechanical stability and high ion conductivity can greatly improve the safety performance of the battery; and the synthesis process of the method does not involve the use of any solvent, which simplifies the operation steps.

Description

technical field [0001] The invention belongs to the field of batteries, and relates to a method for synthesizing a diaphragm in situ by a dry method, a product thereof and a product application. Background technique [0002] With the rapid development of new energy vehicles, the requirements for energy density and safety performance of vehicle energy storage devices are constantly increasing. Lithium-ion batteries, which have the advantages of high specific energy, high specific power, good cycle performance, and no environmental pollution, are considered to be the best choice. It is estimated that by 2025, the energy density of power batteries will reach more than 500Wh / kg. With the continuous improvement of power battery energy density, its safety performance is also facing more severe tests. In addition, in recent years, a large number of electronic products have been popularized. Lithium batteries as their power sources have become more and more popular due to their ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/44H01M50/414H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 马忠龙赵晓宁秦士林郑晓醒
Owner SVOLT ENERGY TECHNOLOGY CO LTD