Natural graphite-based modified composite material and preparation method thereof, and lithium ion battery comprising modified composite material

A composite material and natural graphite technology, which is applied to the negative electrode material of lithium ion battery, its preparation, and the field of natural graphite-based modified composite material, can solve the problem that defect sites cannot be well improved, the material cycle performance has no qualitative improvement, and there is no qualitative improvement. Reveal the effects of improving the isotropy on the electrode expansion rate, and achieve the effect of improving the electrochemical performance, reducing the electrode expansion rate, and having a high degree of isotropy

Inactive Publication Date: 2018-05-22
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Natural graphite-based modified composite material and preparation method thereof, and lithium ion battery comprising modified composite material
  • Natural graphite-based modified composite material and preparation method thereof, and lithium ion battery comprising modified composite material
  • Natural graphite-based modified composite material and preparation method thereof, and lithium ion battery comprising modified composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] 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 natural graphite-based modified composite anode materials.

[0064] Electrochemical performance test:

[0065] The natural graphite-based composite material obtained in Example 1 is used as the negative electrode active material, after being uniformly mixed according to the mass ratio of active material: CMC:SBR=96.5:1.5:2, coated on the copper foil current collector, and dried to obtain the negative electrode A spare pie...

Embodiment 2

[0071] 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 natural graphite-based modified composite anode materials.

[0072] 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.

[0073] Adopt the same method as Example 1 to carry out XRD test, and the obtained results are listed in Table 1.

Embodiment 3

[0075] Spherical natural graphite (average particle size 8 μm) was subjected to cold isostatic pressing at a pressure of 80 MPa for 5 minutes. The product after isostatic pressing is crushed to the approximate particle size of the raw material, and classified. Afterwards, according to the mass ratio of 90:10, 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 1100°C , to obtain natural graphite-based modified composite anode materials.

[0076] 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.

[0077] 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 natural graphite-based modified composite material and a preparation method thereof, and a lithium ion battery comprising the modified composite material. The natural graphite-based modified composite material comprises natural graphite and non-graphitized carbon which coats the inner surface and the outer surface of the natural graphite. The preparation method comprises the following steps of 1) performing isotropy treatment on the spherical natural graphite; 2) performing particle size control and shaping treatment; 3) performing synchronous modification on the innersurface and the outer surface of the material obtained in the step 2); and 4) performing carbonization treatment to obtain the natural graphite-based modified composite material. By virtue of the natural graphite-based modified composite material, synchronous modification on the defect sites of the inner and outer surfaces can be realized, so that cycle stability of natural graphite is greatly improved and expansion of a natural graphite electrode is lowered; and the natural graphite-based modified composite material has wide application prospect in the lithium ion battery used for a mobile phone, a digital camera and other mobile electronic equipment.

Description

technical field [0001] The present invention relates to the technical field of lithium-ion battery negative electrode materials, relates to a natural graphite-based modified composite material, its preparation method and application, in particular to a natural graphite-based modified composite material, its preparation method and the modified composite material 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 ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M10/0525
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周成坤任建国黄友元岳敏
Owner BTR NEW MATERIAL GRP CO LTD
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