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A kind of high temperature switch protection mechanism battery separator and preparation method thereof

A technology of protection mechanism and battery diaphragm, applied in the direction of secondary battery, battery pack parts, separator/film/diaphragm/spacer components, etc., can solve the problem of lack of high temperature switch protection mechanism, unfavorable industrialization, high operating cost, etc. Problems, achieve outstanding thermal stability, good liquid absorption and liquid retention capacity, and improve safety performance

Active Publication Date: 2021-03-26
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has its advantages, the two-time electrospinning method has high operating costs and low efficiency, which is not conducive to industrialization, and does not have a high-temperature switch protection mechanism.

Method used

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  • A kind of high temperature switch protection mechanism battery separator and preparation method thereof
  • A kind of high temperature switch protection mechanism battery separator and preparation method thereof
  • A kind of high temperature switch protection mechanism battery separator and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] a. Take 0.3g polyvinylpyrrolidone (PVP, molecular weight: 1300000) and dissolve it in 10ml ethanol solution to make a gel-like precursor that is beneficial to electrospinning;

[0035] b. Add 3ml of acetic acid to the gel-like precursor obtained in step a, then slowly add isopropyl titanate dropwise under the condition of rapid stirring at 60r / min, and continue stirring for 30min after the addition is completed; make titanium dioxide / PVP nanometer one Precursors of dimensional structural materials;

[0036] c. Using the titanium dioxide / PVP nano-one-dimensional structure material precursor as the electrospinning external liquid, mineral oil as the electrospinning internal liquid, and with the external liquid speed of 0.1ml / h and the internal liquid speed of 0.05ml / h, the electrospinning process was performed at 15kV Positive voltage and negative voltage of 1kV, coaxial co-spinning for 12h under the condition that the receiving distance is controlled at 20cm; the electro...

Embodiment 2

[0040] a. Take 0.3g of polyvinylpyrrolidone (PVP, molecular weight: 1300000) and dissolve it in 10ml of methanol solution to make a gel-like precursor that is beneficial to electrospinning;

[0041] b. Add 3ml of acetic acid to the gel-like precursor, then slowly add isopropyl titanate dropwise under the condition of rapid stirring at 60r / min, and continue stirring for 30min after the addition is completed; make a titanium dioxide / PVP nano one-dimensional structure material precursor body;

[0042] c. Using the titanium dioxide / PVP nano-one-dimensional structure material precursor as the electrospinning external liquid, mineral oil as the electrospinning internal liquid, and with the external liquid speed of 0.1ml / h and the internal liquid speed of 0.05ml / h, the electrospinning process was performed at 15kV Positive voltage and negative voltage of 1kV, coaxial co-spinning for 12h under the condition that the receiving distance is controlled at 20cm; the electrospun film is obt...

Embodiment 3

[0045] a. Take 0.3g polyvinylpyrrolidone (PVP, molecular weight: 1300000) and dissolve it in 10ml ethyl acetate solution to make a gel-like precursor that is beneficial to electrospinning;

[0046] b. Add 3ml of acetic acid to the gel precursor, then slowly add isopropyl titanate dropwise under the condition of rapid stirring at 60r / min, and continue stirring for 30min after the dropwise addition is completed to make a titanium dioxide / PVP nano one-dimensional structure material precursor body;

[0047] c. Using the titanium dioxide / PVP nano-one-dimensional structure material precursor as the electrospinning external liquid, mineral oil as the electrospinning internal liquid, and with the external liquid speed of 0.1ml / h and the internal liquid speed of 0.05ml / h, the electrospinning process was performed at 15kV Positive voltage and negative voltage of 1kV, coaxial co-spinning for 12h under the condition of receiving distance controlled at 20cm, to obtain electrospun film;

...

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Abstract

The invention discloses a high-temperature switch protection mechanism battery diaphragm and a preparation method thereof. The high-temperature switch protection mechanism battery diaphragm is collected from titanium dioxide and PVP nanometer one-dimensional structure through electrospinning. The thickness of the high-temperature switch protection mechanism battery diaphragm is: 20-200μm, porosity 45%-85%. The characteristics of the present invention are: first, it has inorganic components and micro-nano tubular structure, excellent wetting performance, and has better liquid absorption and liquid retention capabilities for electrolyte; second, it has a unique high-temperature switch protection mechanism, and the working temperature reaches 60 ℃, it can stop the charging of the battery, the temperature returns to normal temperature again, and it can continue to work under relatively low pressure conditions; the third is high porosity, small pore size, high ion permeability and electrochemical stability, and excellent mechanical properties. performance, which can effectively prevent short circuit and dendrite puncture of the energy storage device; fourth, the high temperature shrinkage rate is low, and it has good high temperature withstand performance and safety.

Description

technical field [0001] The invention relates to a high-temperature switch protection mechanism battery diaphragm and a preparation method thereof, belonging to the technical field of new energy materials. Background technique [0002] In recent years, with the application of electric vehicles and energy storage systems in different environments, the research and development of lithium-ion batteries with high energy density and high safety has gradually attracted attention. Generally, lithium-ion batteries are mainly composed of positive / negative electrode materials, electrolytes, separators, and battery casing packaging materials. Among them, the diaphragm is an important part of the lithium-ion battery, which plays the role of separating the positive and negative electrodes, preventing the passage of electrons and providing a channel for lithium ions, thereby completing the charge and discharge. Its physical, chemical and mechanical properties determine the interface chara...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/449H01M50/411H01M10/0525H01M50/443H01M50/446H01M50/489H01M50/491H01M50/581
CPCH01M10/0525H01M50/409H01M50/403H01M50/581Y02E60/10
Inventor 张平蒋运鸿丁燕怀姜勇
Owner XIANGTAN UNIV