Method of preparing lithium ion battery negative pole carbon material

Abstract

The invention provides a method for manufacturing anode carbon materials of lithium ion batteries; asphalt is dissolved in gasoline according to the blending proportion of 20-80 %, and insoluble components are removed; the mixture is heated at 400-700 DEG C for 3-30 hours in nitrogen or argon to completely carbonize asphalt and the carbonized asphalt is crushed; the crushed and carbonized asphalt is heated at the high temperature from 2,000 to 3,000 DEG C for 5-30 hours for graphitization to graphitize the crushed asphalt; the graphitized asphalt is dissolved in hydrogen peroxide according to the proportion of 10-60% and is sintered for 2-50 hours at 80-300 DEG C in oxygen to obtain the porous and laminar anode carbon materials of lithium ion batteries. The material produced by the method is beneficial for the extraction and insertion of lithium ions and the enlargement of the area for receiving lithium ions, can facilitate the formation of SEI films and the widening of the path for extraction and insertion of lithium ions at the inner layer and improve the capacity, safety and circularity of batteries.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium ion batteries, in particular to a method for manufacturing negative electrode carbon materials of lithium ion batteries. Background technique [0002] Lithium-ion battery is an ideal small green power source. Since its appearance in 1990, it has developed rapidly because of its excellent performance and has been widely used in society. Lithium-ion batteries have high working voltage, large specific energy, long cycle life, low self-discharge rate, no memory effect, and no pollution. It has quickly occupied many fields with its incomparable advantages, such as mobile phones and notebooks Computers, small cameras, etc., and more and more countries use the battery for military purposes. The positive electrode material of the lithium-ion battery is lithium cobalt oxide, and the negative electrode material is carbon. When the battery is charged, lithium ions are generated on the positiv...

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Problems solved by technology

[0003] The main types of commonly used carbon negative electrode manufacturing methods are: heating soft carbon at a certain high temperature to obtain highly graphitized carbon; decomposing cross-linked resin with a special structure at high temperature to obtain hard carbon; Hydrogen-containing carbon, etc. are prepared, but most of the negative electrode carbon materials produced by the existing method are coated spherical structures, which are not conducive to the complete deintercalation of lithium ions, and the deposition of lithium generated by multiple cycles not only reduces the capacity of the battery And cycle life, and it is easy to form dendrite lithium, which makes the internal short circuit of the battery and greatly reduces the safety of the battery

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