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Negative electrode active material, negative electrode sheet and battery

A negative electrode active material and activated carbon technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of graphite not having fast charging ability, insufficient energy density, and short service life, so as to improve kinetic performance and increase Fast charging capability and long cycle life

Active Publication Date: 2020-10-02
CONTEMPORARY AMPEREX TECH CO
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Problems solved by technology

[0003] Among negative electrode active materials, traditional graphite has the characteristics of high energy density and low cost, and has been widely used, but traditional graphite does not have fast charging ability
At present, in order to achieve fast charging, lithium titanate and amorphous carbon are generally used as negative electrode active materials, but both lithium titanate and amorphous carbon inevitably have severe shortage of energy density, short service life, and high cost in practical applications. defect

Method used

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  • Negative electrode active material, negative electrode sheet and battery

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preparation example Construction

[0019] The preparation method of the negative electrode active material of the first aspect of the present invention may comprise the steps:

[0020] (1) Raw material crushing: crush the precursor of the core layer material (such as pitch coke or petroleum coke, etc.) to obtain particles with an average particle size of 4 μm to 25 μm;

[0021] (2) Shaping and grading: the particles in the step (1) are reshaped, and then classified to adjust the particle size distribution of the material (usually, remove the particles with too large and too small particle sizes);

[0022] (3) Granulation: the raw materials and adhesives after shaping and grading in step (2) are mixed according to a certain mass ratio or heat-treated to carry out granulation (this step can be canceled according to the actual situation);

[0023] (4) Graphitization: graphitize the material after granulation in step (3) or the material in step (2), for example, perform graphitization in a graphitization furnace at...

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Abstract

The present invention provides a negative active material, a negative plate and a battery. The negative active material has a core-shell structure; the core material is selected from graphite; and theshell material is selected from amorphous carbon. The ratio of the mass of active carbon atoms in the negative active material to the total mass of the negative active material is 1%~15%. The specific surface area of the negative active material is 0.4m2 / g~8m2 / g. The battery of the invention simultaneously has the characteristics of excellent dynamic performance, good safety, high energy densityand long cycle life under high rate quick charge.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a negative electrode active material, a negative electrode sheet and a battery. Background technique [0002] Compared with traditional fuel vehicles, the biggest disadvantage of electric vehicles is the charging time. Usually, the charging time of electric vehicles is more than ten hours, which seriously limits the use of electric vehicles. Therefore, in order for electric vehicles to replace traditional fuel vehicles, charging speed is one of the key technologies that must be overcome, which is also a very important indicator that affects user experience. In a specific power battery system, the key to determining its charging speed is the negative electrode, and the negative active material in the negative electrode is the key to determining the charging speed. [0003] Among the negative electrode active materials, traditional graphite has the characteristics of high energy density a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/133H01M10/0525
CPCY02E60/10
Inventor 申玉良王家政康蒙何立兵
Owner CONTEMPORARY AMPEREX TECH CO
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