Diaphragm, method for preparing diaphragm and secondary battery comprising diaphragm

A diaphragm, selected technology, applied in the field of secondary batteries, can solve the problems of limited wettability of ultrasonic dispersion technology, difficulty in controlling the uniformity of diaphragm treatment, poor nano-dispersion, etc., to shorten the standing time and implement The effect of strong resistance and short soaking time

Inactive Publication Date: 2016-07-20
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are more or less defects in the above modification technologies, such as: the relatively high price of processing equipment, cumbersome procedures and high cost of raw materials, which affect large-scale industrial use; due to poor nano-dispersion, it is difficult to control the uniformity of diaphragm treatment ;Ultrasonic dispersion technology can improve wettability to a limited extent; processing performance is poor and will cause safety hazards, etc.

Method used

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  • Diaphragm, method for preparing diaphragm and secondary battery comprising diaphragm
  • Diaphragm, method for preparing diaphragm and secondary battery comprising diaphragm
  • Diaphragm, method for preparing diaphragm and secondary battery comprising diaphragm

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preparation example Construction

[0047] The present application also relates to the preparation method of the diaphragm, which can be prepared by the following two preparation methods according to the different properties of the amphiphilic polymer:

[0048] Preparation method (1): dissolving the amphiphilic polymer in a solvent to form solution I, and preparing each additive into solution II, solution III to solution N, where N is an integer greater than or equal to 1; solution II, solution Solution III to solution N are sequentially added to solution I to form a premixed solution, and after stirring evenly, the diaphragm is obtained by adjusting the viscosity, defoaming, coating on the substrate, and drying;

[0049] Preparation method (2): mixing the amphiphilic polymer and additives and then melting to obtain a slurry, and coating the slurry on a substrate to obtain the separator.

[0050] As an improvement of the preparation method of the present application, the additives can be selected from binders or...

Embodiment 1

[0071] Prepare a clean and flat PE substrate in advance. The amphiphilic polymer (the specific structural formula is shown in Table 1) and the solvent are configured into a solution, uniformly mixed, and stirred in vacuum at 60° C. for 60 min, then sequentially added 3% PVDF premix and 3% CMC premix, and Stir under vacuum at 80°C for 90 minutes, adjust the viscosity to obtain a uniform premixed solution. Immerse the spare base material in the premixed solution for 60s, and then pull it out of the liquid surface at a certain pulling speed to form a uniform liquid film (repeat the above operations to increase the film thickness), and then place it in a vacuum drying oven at 90°C 4 hours is enough.

[0072] The specific parameters are shown in Table 2, wherein the PVB adopts Aladdin (Aladdin), product number P105915 (Shanghai Crystal Pure Biochemical Technology Co., Ltd.).

[0073] Table 1:

[0074]

[0075]

[0076] Table 2:

[0077]

Embodiment 2

[0079] Prepare a clean and flat PE diaphragm in advance. After the amphiphilic polymer and additives are physically mixed in a certain weight ratio, melted, and then the molten mixture is sprayed from the beam source furnace to a flat spare substrate at a certain flow rate and pressure to obtain the required isolation film . The amphiphilic polymer and its added dosage and preparation parameters are shown in Table 3.

[0080] table 3:

[0081]

[0082]

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Abstract

The invention relates to the field of secondary batteries, in particular to a diaphragm, a method for preparing the diaphragm and a secondary battery comprising the diaphragm. The diaphragm comprises a base material and a modification layer arranged on the surface of the base material, wherein the modification layer contains amphiphilic polymers which are at least one of polyvinyl butyral, amphiphilic segmented copolymer and polyolefin with a functional end group, and the functional end group at least contains a hydrophilic group. The diaphragm has high electrolyte loving property and water loving property, so that the diffusion rate of electrolyte in a prepared lithium ion battery is high, infiltration time is shortened, and the charge-discharge rate of the battery is increased; besides, the standing time of a naked battery cell after injection can be shortened, and then efficiency is improved and cost is reduced.

Description

technical field [0001] The present application relates to the field of secondary batteries, in particular, to a separator, its preparation method and a secondary battery containing the separator. Background technique [0002] As we all know, lithium-ion batteries play a very important role in the fields of consumer electronics, electric vehicles and energy storage. With the continuous innovation of lithium-ion batteries, in order to greatly improve the comfort of user experience, many companies are focusing on the development of high-performance lithium-ion batteries, such as: high energy density, high rate performance, low cost, etc. Most of the separator materials used in lithium-ion batteries are polyolefin materials, but the lack of polar groups in polyolefin materials directly affects the separator's liquid absorption rate, liquid retention rate and ion conductivity of the electrolyte. For example, when the wettability of the diaphragm and the electrolyte is poor, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/44
CPCH01M50/44H01M50/403Y02E60/10
Inventor 李英闫传苗艾邓均钟开富
Owner CONTEMPORARY AMPEREX TECH CO
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