A voltage sensitive membrane and preparation method thereof

A sensitive, diaphragm technology, used in circuits, electrical components, battery pack components, etc.

Inactive Publication Date: 2005-03-16
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention proposes a voltage-sensitive diaphragm and a preparation method thereof, the purpose of which is to establish an overcharge protection mechanism inside an organic electrolyte secondary battery to prevent battery overcharge and solve the problem of battery overcharge safety

Method used

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  • A voltage sensitive membrane and preparation method thereof
  • A voltage sensitive membrane and preparation method thereof

Examples

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example 1

[0019] Example 1. Using polyaniline as a potential sensitive material, polyvinylidene fluoride (PVDF) as a binder, and N,N-dimethylpyrrolidone as a solvent, mixed according to a certain proportion to prepare a uniform slurry. A porous polypropylene membrane with a thickness of 50 μm and a porosity of 80% was immersed in this slurry. After the slurry fully infiltrates the microporous membrane, it is taken out and dried to obtain a voltage-sensitive diaphragm. Using this film as a separator, LiTiS 2 as positive electrode, Li sheet as negative electrode, 1mol / LLiPF 6 The / EC+DMC solution is used as the electrolyte to assemble a 2025-type button lithium battery. In the normal charging and discharging voltage range of 1.5V-3.0V, when charging and discharging with a constant current of 10mA, the battery capacity is 50mAh.

[0020] figure 1 for Li / LiTiS 2 Overcharge curve of button cell. It can be seen from the figure that due to the overcharge protection function of the diaphr...

example 2

[0021] Example 2. Using polyphenylene as potential sensitive material, nano-SiO 2 The powder is an inert component additive, and the polytetrafluoroethylene (PTFE) emulsion is a binder. After mixing uniformly according to a certain proportion, roll it into a film with a thickness of about 30 μm. Using this film as a separator, LiCoO 2 is the positive electrode, Li 4 Ti 5 o 12 The sheet is the negative electrode, 1mol / L LiPF 6 The / EC+DMC solution is used as the electrolyte to assemble a 2025-type button lithium-ion battery. In the normal charging and discharging voltage range of 2.0V-2.7V, when charging and discharging with a constant current of 5mA, the battery capacity is 20mAh.

[0022] figure 2 for LiCoO 2 / Li 4 Ti 5 o 12 Overcharge curve for a coin-type Li-ion battery. It can be seen from the figure that due to the overcharge protection function of the diaphragm, after the battery is overcharged for a period of time, the voltage no longer changes with time.

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Abstract

A voltage sensitive diaphragm and its manufacturing method is disclosed, whose basic characteristics is: diaphragm structure has electric active polymer material which can have P-typed doping under high oxidation potential, the material is electric insulator in intrinsic condition while electric conductor in P-typed doping condition, so that electric conductivity will change according to positive electric potential of battery. The diaphragm can supply reversible protection for secondary battery .

Description

technical field [0001] The invention relates to the composition principle of a voltage-sensitive diaphragm, which belongs to the field of chemical power sources. Background technique [0002] The safety of the battery in the overcharged state has always been the biggest application problem faced by the organic electrolyte secondary battery. For an aqueous solution secondary battery, when it is in an overcharged state, water is oxidized at the positive electrode of the battery to generate oxygen, and reduced at the negative electrode to generate hydrogen, and the resulting gas product can reversibly recombine into water inside the battery. This reversible decomposition-recombination of water provides an internal overcharge protection mechanism for the aqueous solution secondary battery, so that the aqueous solution secondary battery has good overcharge resistance. For non-aqueous secondary battery systems using organic electrolyte solutions, the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16
CPCY02E60/10
Inventor 艾新平杨汉西肖利芬曹余良
Owner WUHAN UNIV
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