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High-ionic-conductivity lithium battery diaphragm with self-closing function and preparation method of high-ionic-conductivity lithium battery diaphragm

A technology of ionic conductivity and lithium battery diaphragm, which is applied in the direction of battery pack parts, circuits, electrical components, etc., can solve the problems of low ion conductivity, no self-shutdown function, and low thermal stability of lithium battery diaphragms, etc., to achieve High thermal sensitivity and thermal dimensional stability, high safety and performance, and wide application range

Pending Publication Date: 2021-11-02
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems in the prior art that the ionic conductivity of the lithium battery diaphragm is not high, there is no self-shutdown function or the self-shutdown temperature is high, that is, the thermal sensitivity is not high and the thermal stability is poor, and to provide a lithium battery separator with high thermal stability. Sensitivity (that is, the membrane can be self-closing at a lower temperature), and a lithium battery separator with high ionic conductivity and high thermal dimensional stability and its preparation method

Method used

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  • High-ionic-conductivity lithium battery diaphragm with self-closing function and preparation method of high-ionic-conductivity lithium battery diaphragm

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Effect test

Embodiment 1

[0055] A method for preparing a high ion conductivity lithium battery diaphragm with self-closing function, the specific steps are as follows:

[0056] (1) Preparation of raw materials;

[0057] Preparation of Conductive Inorganic Solutions Containing Viscous Substances:

[0058] According to the mass volume ratio of 0.5mg / mL, the conductive inorganic substance (the MXene of the lamellar structure) is dispersed in the aqueous solution, and then it is mixed with the aqueous solution containing the viscous substance (styrene-butadiene latex binder) to obtain the viscous substance. Conductive inorganic substance solution: in the prepared conductive inorganic substance solution containing viscous substances, the concentration of viscous substances is 0.001wt%.

[0059] Preparation of ceramic nanoparticle solutions containing viscous substances:

[0060] According to the mass volume ratio of 0.5mg / mL, ceramic nanoparticles (hydrophilic nano-SiO 2 particles, with an average parti...

Embodiment 2

[0082] A method for preparing a high ion conductivity lithium battery diaphragm with self-closing function, the specific steps are as follows:

[0083] (1) Preparation of raw materials;

[0084] Preparation of Conductive Inorganic Solutions Containing Viscous Substances:

[0085] According to the mass volume ratio of 0.5mg / mL, the conductive inorganic substance (the MXene of the lamellar structure) is dispersed in the aqueous solution, and then it is mixed with the aqueous solution containing the viscous substance (styrene-butadiene latex binder) to obtain the viscous substance. Conductive inorganic substance solution: in the prepared conductive inorganic substance solution containing viscous substances, the concentration of viscous substances is 0.001wt%.

[0086] Preparation of ceramic nanoparticle solutions containing viscous substances:

[0087] According to the mass volume ratio of 0.5mg / mL, ceramic nanoparticles (hydrophilic nano-SiO 2 Particles, with an average parti...

Embodiment 3

[0096] A method for preparing a high ion conductivity lithium battery diaphragm with self-closing function, the specific steps are as follows:

[0097] (1) Preparation of raw materials;

[0098] Preparation of Conductive Inorganic Solutions Containing Viscous Substances:

[0099] According to the mass volume ratio of 0.5mg / mL, the conductive inorganic substance (the MXene of the lamellar structure) is dispersed in the aqueous solution, and then it is mixed with the aqueous solution containing the viscous substance (styrene-butadiene latex binder) to obtain the viscous substance. Conductive inorganic substance solution: in the prepared conductive inorganic substance solution containing viscous substances, the concentration of viscous substances is 0.001wt%.

[0100] Preparation of ceramic nanoparticle solutions containing viscous substances:

[0101] According to the mass volume ratio of 0.5mg / mL, ceramic nanoparticles (hydrophilic nano-SiO 2 particles, with an average parti...

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Abstract

The invention relates to a high-ionic-conductivity lithium battery diaphragm with a self-closing function and a preparation method of the high-ionic-conductivity lithium battery diaphragm. The method comprises the following steps of: (1) performing vacuum filtration on a conductive inorganic substance solution containing a viscous substance on one side of a micro-nano fiber membrane, and then performing vacuum drying; and (2) sequentially carrying out vacuum suction filtration on the two sides of the membrane obtained in the step (1) by using a ceramic nanoparticle solution containing a viscous substance, and carrying out vacuum drying after each suction filtration to obtain a composite membrane. The prepared lithium battery diaphragm is a composite membrane consisting of a ceramic nano-particle layer, a conductive inorganic substance layer, a micro-nano fiber membrane and a ceramic nano-particle layer in sequence along the thickness direction, the relative positions of the ceramic nanoparticles, the conductive inorganic matter and the micro-nanofiber membrane (made of pure poly(butylene succinate)) in the composite membrane are fixed by the viscous substance, and the porosity of the composite membrane is 50-56%. The high-ionic-conductivity lithium battery diaphragm has relatively high thermal sensitivity and thermal dimensional stability, so that a lithium battery is relatively high in safety and use performance, and the high-ionic-conductivity lithium battery diaphragm has a great application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and relates to a high ion conductivity lithium battery diaphragm with self-closing function and a preparation method thereof. Background technique [0002] Lithium battery has become an ideal energy storage system with great potential because of its high energy density, high-speed charge-discharge capability, low self-discharge rate, long cycle life, and environmental friendliness. As an important part of the battery, the separator does not directly participate in the electrochemical reaction, but it plays the role of isolating the positive and negative electrodes in the battery, providing ion transmission channels, and preventing the internal short circuit of the battery. Its structure and performance have great influence on the use and safety performance of the battery. has an important influence. [0003] At present, the separators widely used in lithium batteries mainly include pol...

Claims

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Application Information

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IPC IPC(8): H01M50/457H01M50/451H01M50/454H01M50/431H01M50/434H01M50/44H01M50/414H01M50/491H01M50/403D04H1/728D04H1/4382
CPCH01M50/457H01M50/451H01M50/454H01M50/431H01M50/434H01M50/44H01M50/414H01M50/491H01M50/403D04H1/728D04H1/43838Y02E60/10
Inventor 魏真真顾嘉怡李家仪赵燕
Owner SUZHOU UNIV
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