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Natural graphite composite material, preparation method thereof and lithium ion battery

A technology of lithium ion battery and natural graphite, which is applied to the preparation method thereof and the field of lithium ion battery and natural graphite composite material, can solve the problems of low capacity, non-uniform amorphous carbon and high cycle expansion rate

Active Publication Date: 2016-10-26
贝特瑞(江苏)新能源材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, one of the purposes of the present invention is to provide a kind of natural graphite composite material, and this natural graphite composite material solves the non-uniformity of amorphous carbon coated on the surface of natural graphite, low compaction of natural graphite material, low capacity, cycle Problems with high expansion rate and short cycle life

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  • Natural graphite composite material, preparation method thereof and lithium ion battery
  • Natural graphite composite material, preparation method thereof and lithium ion battery

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Embodiment 1

[0072] In this embodiment, the natural graphite composite material includes spherical natural graphite and an amorphous carbon shell coated on the surface of the spherical natural graphite. The amorphous carbon shell is obtained by high-temperature treatment of mesophase pitch and pyromellitic dianhydride, and the mesophase The mass ratio of pitch to pyromellitic dianhydride is 3:1, and the mass of spherical natural graphite is 80% of the natural graphite composite material.

[0073] The preparation method of the above-mentioned natural graphite composite material is as follows.

[0074] Spherical natural graphite is pulverized and spheroidized using an internal classification micropowder machine in a continuous feeding mode, the pulverization speed is 4000rpm, and the time is 2min to obtain graphite particles; the obtained graphite particles are mixed with mesophase pitch and pyromellitic dianhydride by The mass ratio is 80.0:15.0:5.0 for VC mixing, the mixing time is 3min, t...

Embodiment 2

[0076] In this embodiment, the natural graphite composite material includes spherical natural graphite and an amorphous carbon shell coated on the surface of the spherical natural graphite. The amorphous carbon shell is obtained through high-temperature treatment of coal tar pitch and trimellitic anhydride, and coal tar pitch and pyrene The mass ratio of triformic anhydride is 3:1, and the mass of spherical natural graphite is 90% of the natural graphite composite material.

[0077] The preparation method of the above-mentioned natural graphite composite material is as follows.

[0078] Spherical natural graphite is graded to obtain graphite particles; the graphite particles are mixed with coal tar pitch and trimellitic anhydride at a mass ratio of 90.0:8.0:2.0 in a mass ratio of 90.0:8.0:2.0. The mixing time is 20 minutes and the temperature is 45°C. The graphite-binder-additive mixture powder is obtained; the mixture powder is subjected to hot molding treatment, the treatmen...

Embodiment 3

[0080] In this embodiment, the natural graphite composite material includes spherical natural graphite and an amorphous carbon shell coated on the surface of the spherical natural graphite. The amorphous carbon shell is obtained through high-temperature treatment of coal tar pitch and trimellitic anhydride, and coal tar pitch and pyrene The mass ratio of triformic anhydride is 3:1, and the mass of spherical natural graphite is 90% of the natural graphite composite material.

[0081] The preparation method of the above-mentioned natural graphite composite material is as follows.

[0082] Carry out ball milling treatment with flaky natural graphite, the ball milling time is 60min, the instrument rotating speed is 300rpm, the diameter of adopting corundum ball is 5mm, obtains graphite particle; The obtained graphite particle and water-soluble resin are carried out liquid phase stirring according to mass ratio 85.0:15.0 and Dry to obtain a powder, and then carry out VC mixing of t...

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Abstract

The invention relates to a natural graphite composite material, a preparation method thereof and a lithium ion battery. The natural graphite composite material comprises natural graphite and an amorphous carbon shell coating the surface of natural graphite, wherein the amorphous carbon shell is made from a bonding agent and an additive through thermal treatment. The amorphous carbon shell is made from the bonding agent and the additive through thermal treatment, can uniformly coat the surface of natural graphite, and provides the natural graphite composite material with characteristics of high capacity, good compaction, low circulation expansion ratio and long circulation life. The natural graphite composite material is stable in performance and excellent in overall performance. The preparation method of the natural graphite composite material is mild in condition, simple in process and low in cost.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a natural graphite composite material, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion battery, as a mature electrochemical power system, has been used in all aspects of people's daily life, and has been applied in power battery vehicles. The composite graphite materials currently used in lithium-ion batteries can be divided into natural graphite and artificial graphite. Although natural graphite has significant advantages over artificial graphite in terms of compaction performance, specific capacity, and cost, due to the small interlayer spacing (D002) of natural graphite , High crystallinity, during the charging and discharging cycle of lithium-ion batteries, the deformation of the graphite layer is significant, so the thickness of the battery expands greatly after the cycle, and the battery life is short. These pr...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/133H01M4/1393H01M10/0525
CPCH01M4/133H01M4/1393H01M4/362H01M4/583H01M10/0525Y02E60/10
Inventor 岳敏闫慧青刘福静李子坤谌芳园
Owner 贝特瑞(江苏)新能源材料有限公司
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