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Graphite-hard carbon coated material and preparation method thereof

A coating type, graphite technology, applied in the field of carbon negative electrode materials and its preparation, can solve the problems of irreversible capacity decline, achieve the effect of improving poor cycle performance and simple preparation process

Active Publication Date: 2020-02-14
TIANJIN UNIV
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Problems solved by technology

Ordinary hard carbon is derived from high-temperature pyrolysis of organic matter or polymers, which cannot avoid leaving some oxygen-containing groups, and gas will be generated during the pyrolysis process to form micropores, making its first irreversible capacity decrease

Method used

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  • Graphite-hard carbon coated material and preparation method thereof
  • Graphite-hard carbon coated material and preparation method thereof
  • Graphite-hard carbon coated material and preparation method thereof

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Embodiment Construction

[0021] The following is a further description of the present invention, rather than limiting the application of the present invention. The phenolic resin used is boron-containing phenolic resin (oligomer, liquid, analytically pure) from Shaanxi Taihang Fire-retardant Polymer Co., Ltd., and the graphite is 1420 graphite (battery grade) from Huzhou Chuangya Power Battery Material Co., Ltd. From Tianjin Fuyu Fine Chemical Co., Ltd. (analytical pure).

[0022] Take by weighing 30 grams of phenolic resin, without curing, divide it into three parts, dissolve it in tetrahydrofuran respectively, and stir and ultrasonically alternately carry out until the phenolic resin is completely dissolved (that is, after the oligomeric phenolic resin is evenly dispersed in the solvent tetrahydrofuran to form a uniform solution), Add 1 gram, 5 grams, and 10 grams of graphite to three parts of tetrahydrofuran solutions of phenolic resins respectively, stir magnetically for ten hours to mix uniformly...

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Abstract

The invention discloses a graphite-hard carbon coated material and a preparation method thereof. The preparation method comprises the steps of mixing graphite and oligomerization phenolic resin, curing and pyrolyzing to realize in-situ coating of graphite and hard carbon. According to the invention, phenolic resin is adopted for pyrolysis to prepare hard carbon, the surface of a graphite materialis coated with the obtained hard carbon, and a negative electrode material with high specific capacity is prepared.

Description

technical field [0001] The invention belongs to the field of carbon composite materials, and more specifically relates to a carbon negative electrode material and a preparation method thereof. Background technique [0002] With the advancement of science and technology, the human demand for energy has increased. On the one hand, the storage of traditional energy such as oil, natural gas, and coal has declined sharply; on the other hand, the climate problems brought about by the consumption of these energy sources, such as the greenhouse effect, cannot be ignored, threatening the normal production and life of human beings at all times. Electric energy is a secondary energy source. The convenient hydropower resources and geothermal resources in nature provide unlimited possibilities for power generation. At the same time, it is also necessary to find a new energy storage device. The appearance of the battery has once again brought great changes to people's lives. It is small ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 封伟周日新李瑀
Owner TIANJIN UNIV
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