Charcoal negative electrode material and its preparation method

Abstract

The invention relates to a new carbon cathode, which comprises: graphite powder and the graphitized middle phase cover layer, wherein it is characterized in that: the average thickness of middle layer is 0.5-8 mum. And the invention also discloses a relative preparation, which comprises: (1) mixing 5-45% graphite powder and 95-55% pitch, adding the aggregation restrain agent at 0.5-5%, to polymerize at 380-480Deg. C; (2) separating; (3) drying; (4) carbonizing; (5) graphitizing. The invention covers graphitized middle phase layer over the graphite, to obtain better property, and it can restrain the solid particle aggregation, to control the diameter.

Description

technical field [0001] The invention relates to a carbon negative electrode material and a preparation method thereof, in particular to a graphite carbon negative electrode material containing a coating layer and a preparation method thereof. Background technique [0002] Carbon materials are widely used in many fields due to their stable chemical properties, high electronic conductivity, intercalation to form intercalation compounds, and heat resistance, thermal shock resistance, and high specific strength. . Especially in recent years, the development of carbon anode materials for lithium-ion batteries has been active. Natural graphite, artificial graphite and special artificial graphite-graphitized mesophase (including mesophase carbon microspheres and monolithic mesophase powder) have been used in commercial batteries. Several types of carbon materials. Natural graphite has an ideal layered structure, has a high capacitance (>350mAh / g), and is easy to compact (>1...

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Problems solved by technology

The low-crystallinity carbon coated in the above-mentioned patents is low in processing temperature, and there are few microcrystals in an ordered state in the structure. It is still in a state of random stratification, and the material has high strength and poor toughness. When the compacted density is high, It is easy to break the cladding layer, resulting in the exposure of internal materials

US patent US20040023115 proposes the use of spherical natural graphite mixed with graphitized mesophase powder to obtain graphite materials that are easy to roll with high density and can be used to prepare lithium batteries with high energy density, but the weakness of natural graphite cannot be overcome

However, grap

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