Electrode active material and method for making same and lithium ion secondary battery electrode

A technology of electrode active materials and electrode materials, which is applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve the problems of not being able to increase the resistance in time and effectively cut off the current, and achieve easy industrial production and avoid The effect of fire or explosion and increased resistance

Inactive Publication Date: 2008-03-05
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to overcome the shortcomings of the electrode obtained in the prior art that the resistance cannot be effectively increased in time and cut off the current when the battery temperature rises, and to provide an electrode that can effectively increase the resistance in time when the battery temperature rises. Electrode active material with resistance to block current, preparation method thereof, and lithium ion secondary battery electrode containing the same

Method used

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  • Electrode active material and method for making same and lithium ion secondary battery electrode
  • Electrode active material and method for making same and lithium ion secondary battery electrode

Examples

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Embodiment approach

[0031] According to one embodiment of the present invention, the composition containing conductive particles and crystalline polymers with positive temperature coefficient effects may also contain other materials with positive temperature coefficient effects, such as ceramic material particles with positive temperature coefficient effects such as Barium titanate and / or barium titanate particles embedded with Sr and Pb. Based on the total amount of the composition containing the conductive particles and the crystalline polymer with the positive temperature coefficient effect, the content of other materials with the positive temperature coefficient effect may be 0-20% by weight.

[0032] The electrode active material substrate can be various positive active material substrates or negative active material substrates conventionally used in lithium ion secondary batteries. For example, the positive active material substrate can be selected from lithium cobalt oxygen, lithium nickel ...

Embodiment 1

[0048] This embodiment is used to illustrate the electrode active material provided by the present invention, the electrode containing the material and the preparation method thereof.

[0049] Dissolve 3 grams of polyethylene with a glass transition temperature of 120°C and a crystallinity of 60% in 200 ml of hot xylene solvent at 80°C in a fume hood, and keep the temperature at 100°C under stirring until the polyethylene is completely dissolved After 1 gram of average particle diameter D 50 0.2 micron, resistivity 5×10 -5 Mix graphite with ohm cm and a specific surface of 350 square meters per gram and continue to stir evenly at this temperature. After stirring evenly, continue to heat to volatilize the solvent. The average particle diameter is D 50 9 micron cathode active material matrix LiCoO 2 Mix and stir vigorously until the solvent evaporates to polyethylene, graphite, LiCoO 2 After the mixture was coagulated, the coagulated product was placed in an oven at 130° C. ...

Embodiment 2-6

[0052] The examples 2-6 are used to illustrate the electrode active material provided by the present invention, the electrode containing the material and the preparation method thereof.

[0053] The electrode active material was prepared according to the method described in Example 1, except that the types and amounts of the raw materials of the electrode active material are shown in Table 1 below. In Table 1, the units of all dosages are grams, the units of glass transition temperature are °C, and the particle diameters are D 50 The unit of average particle diameter is micron, and the unit of resistivity is ohm·cm.

[0054] Then, according to the method described in Example 1, the electrode active material was prepared into an electrode sheet for a lithium ion secondary battery.

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Abstract

This invention relates to an active material of electrodes including a matrix of the active material, in which, said material includes a resistor material layer with positive temperature coefficient effect covering the outer surface of the matrix, and the resistivity of the electrode got from the active material under 20-50deg.C is corresponding to that of the electrode of the current technology, yet its resistivity under 130deg.C is 7-25times of that under 50deg.C, therefore, this invented active material and poles can isolate current under high temperature effectively on the basis of working under normal conditions.

Description

technical field [0001] The invention relates to a lithium ion secondary battery electrode active material, a preparation method thereof and a lithium ion secondary battery electrode containing the material. Background technique [0002] Lithium-ion secondary battery is a high-energy battery that has developed rapidly in recent years. Compared with traditional batteries such as Ni-MH batteries, Ni-Cd batteries and lead-acid batteries, lithium-ion secondary batteries have higher operating voltage and higher Incomparable features such as high energy density. In fact, lithium-ion secondary batteries occupy more than 30% of the portable energy market due to their excellent electrochemical performance, and have become a hot spot for research, development and application at home and abroad. In addition, with the advancement of material technology and the improvement of battery design technology, the application range of lithium-ion secondary batteries is expected to further expand...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/04H01M4/02H01M10/0525H01M10/42
CPCY02E60/12Y02E60/10
Inventor 肖峰李仲
Owner BYD CO LTD
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