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Modified composite material, preparation method thereof and lithium ion battery

A composite material and modification technology, which is applied in the direction of battery electrodes, secondary batteries, active material electrodes, etc., can solve the problem of not improving defect sites well, not revealing the effect of improving isotropy on electrode expansion rate, and material circulation There is no qualitative improvement in performance, etc., to achieve the effect of improving cycle performance and other electrochemical properties, low production cost, and high practicability

Pending Publication Date: 2022-03-25
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the basis of the above-mentioned CN101685858 A, the isotropic material obtained by high pressure treatment was further surface treated, and the further surface treatment improved the performance of the material, but because this method could not improve the internal properties of the material Defect sites, so that the cycle performance of the material has not been qualitatively improved
In addition, none of the above patents discloses the effect of improving material isotropy on electrode expansion rate

Method used

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  • Modified composite material, preparation method thereof and lithium ion battery
  • Modified composite material, preparation method thereof and lithium ion battery
  • Modified composite material, preparation method thereof and lithium ion battery

Examples

Experimental program
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preparation example Construction

[0066] The application also provides a preparation method of modified composite material, such as figure 1 Shown, is the flow chart of the preparation method of the present application, and this method comprises the following steps:

[0067] Step S100, isotropic treatment: perform isotropic treatment on spherical natural graphite;

[0068] Step S200, particle size control and shaping treatment: pulverize and classify the material after isotropic treatment;

[0069] Step S300, synchronous modification of the inner surface and outer surface of the material: adding the pulverized and classified material and the modifier into the reaction vessel, heating up and stirring at a constant temperature under the first protective atmosphere;

[0070] Step S400, carbonize the heated and stirred material in a second protective atmosphere to obtain a modified composite material.

[0071] In the above technical scheme, the degree of isotropy of the material is improved through isotropy trea...

Embodiment 1

[0104] Spherical natural graphite (with an average particle size of 15 μm) was subjected to cold isostatic pressing at a pressure of 130 MPa for 5 minutes. The product after isostatic pressing is crushed to the approximate particle size of the raw material, and classified. Then according to the mass ratio of 85:15, put the graded samples and coal tar pitch (softening point is 110°C) into the stirring heater and stir for 10 minutes, then raise the temperature to 300°C and stir for 30 minutes at a constant temperature, and then carbonize at 1200°C , to obtain a modified composite negative electrode material.

[0105] Electrochemical performance test:

[0106] The composite material obtained in Example 1 was used as the negative electrode active material, and after being uniformly mixed according to the mass ratio of active material: CMC:SBR=96.5:1.5:2, it was coated on the copper foil current collector, and dried to obtain the negative electrode sheet for later use.

[0107] B...

Embodiment 2

[0112] Spherical natural graphite (with an average particle size of 10 μm) was subjected to cold isostatic pressing at a pressure of 100 MPa for 5 minutes. The product after isostatic pressing is crushed to the approximate particle size of the raw material, and classified. Then, according to the mass ratio of 60:40, put the graded samples and coal tar pitch (softening point is 110°C) into the stirring heater and stir for 10 minutes, then raise the temperature to 300°C and stir for 30 minutes at a constant temperature, and then carbonize at 1200°C , to obtain a modified composite negative electrode material.

[0113] The same method as in Example 1 was used to prepare negative electrodes, assemble button batteries and finished batteries, and perform performance tests. The obtained cycle performance and electrode expansion rate are listed in Table 1.

[0114] Adopt the same method as Example 1 to carry out XRD test, and the obtained results are listed in Table 1.

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Abstract

The invention provides a modified composite material, a preparation method thereof and a lithium ion battery. The modified composite material comprises natural graphite and non-graphitized carbon coating the inner surface and the outer surface of the natural graphite. The modified composite material disclosed by the invention realizes synchronous modification of defect sites on the inner surface and the outer surface, greatly improves the cycling stability of natural graphite and reduces the expansion of a natural graphite electrode, and has a wide application prospect in the field of lithium ion batteries for mobile electronic equipment such as mobile phones and digital cameras.

Description

technical field [0001] The application relates to the technical field of negative electrode materials for lithium-ion batteries, and relates to a modified composite material, a preparation method thereof, and a lithium-ion battery. Background technique [0002] With the intensification of environmental pollution and the reduction of fossil energy stocks, human beings urgently need to establish a new way of life that does not rely on fossil fuels, especially in the field of transportation. The development of pure electric vehicles is considered to be the general trend. Among many secondary battery systems, lithium-ion batteries are considered to be the most promising power batteries due to their high energy density, high operating voltage, long-term cycle stability, and no memory effect. [0003] Lithium-ion batteries are mainly composed of negative electrodes, electrolytes, separators, and positive electrodes. Among them, the positive and negative electrodes have a decisive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525
CPCH01M4/583H01M10/0525H01M4/362H01M4/625Y02E60/10H01M4/587H01M4/133H01M4/366H01M4/1393C01B32/05C01B32/21C01B2204/22C01B2204/32C01P2004/61C01P2004/84C01B32/205H01M2004/027
Inventor 刘兴杨周海辉李东东任建国黄友元
Owner BTR NEW MATERIAL GRP CO LTD
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