Process method for granulating or coating graphite negative electrode material

Abstract

The invention discloses a process method for granulating or coating a graphite negative electrode material. The method comprises the following steps: 1) adding a carbon source powder material of 5-30[mu]m into a reaction kettle, stirring the material at a speed of 15-25 rpm, heating the material to T1 at a heating rate of 1-6 DEG C / min, and carrying out constant temperature treatment for 0.5-4 hours, T1 ranging from room temperature to 300 DEG C; 2) at the constant temperature T1, spraying a liquid binder or a coating agent to the surface of the carbon source powder material under stirring toobtain a uniformly mixed material; 3) increasing the temperature of the reaction kettle to T2 according to a preset temperature rise condition at a stirring speed of 15-45 rpm, and performing constant-temperature treatment for 0.5-4 hours to enable the uniformly mixed materials to form stable composite particles or coatings, T2 ranging from T1 to 900 DEG C; 4) cooling the reaction kettle to be lower than 50 DEG C, feeding the reaction kettle into a roller kiln, and carbonizing the raw materials at 900-1300 DEG C, and 5) mixing, screening and demagnetizing the product after carbonization to obtain the required finished product, namely, the graphite negative electrode material.

Description

technical field [0001] The invention relates to the technical field of lithium battery material production and manufacturing, in particular to a process for granulating or coating graphite negative electrode materials. Background technique [0002] In the industrial preparation process of graphite anode materials, processes such as granulation and coating are often used. [0003] The conventional method of granulation is to simply mix the binder and the material, and then stir and granulate at a certain temperature. The obtained product has a wide particle size distribution and low vibration, which is not conducive to the post-processing of the product and will reduce the performance of the product, especially When the grain size is too small, it is easy to produce waste and cause irreparable losses. [0004] The conventional method of coating is to simply physically mix the solid or liquid coating agent with the material, then put the material in the crucible, and raise th...

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Problems solved by technology

[0003] The conventional method of granulation is to simply mix the binder and the material, and then stir and granulate at a certain temperature. The obtained product has a wide particle size distribution and low vibration, which is not conducive to the post-processing of the product and will reduce the performance of the product, especially When the grain size is too small, it is easy to produce waste and cause irreparable losses

[0004] The conventional method of coating is to simply physically mix the solid or liquid coating agent with the material, then put the material in the crucible, and raise the temperature in a static state to make the coating agent self-leveling to form a coating layer and carbonize. The risk of unevenness, and often the obtained products have low vibration and large specific table, and the obtained products have poor processability, and the performance of cycle, first effect and high temperature resistance after making batteries cannot meet the needs of customers

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