Processing technology of composite modified graphite negative electrode with good cycling stability
A cycle stability, graphite negative electrode technology, applied in the direction of negative electrode, active material electrode, electrode manufacturing, etc., can solve the problems of low chemical performance of graphite negative electrode, reduced irreversible capacity, and inability to amplify current, so as to reduce irreversible capacity and reduce Surface defect sites, the effect of increasing electrochemical performance
Pending Publication Date: 2022-03-04
DONGGUAN KAIJIN NEW ENERGY TECH
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[0002] Lithium-ion batteries using graphite materials as negative electrodes have certain safety and stability performance. At present, most graphite negative electrodes are processed with phenolic resin for primary modification, but the existing composite modified graphite negative electrode processing technology, the reduction is irreversible The effect of capacity is not good; the existing processing technology of composite modified graphite negative electrode still has the problem of relatively low cycle life; the existing processing technology of composite modified graphite negative electrode has low electrochemical performance of processed graphite negative electrode , cannot amplify the current
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[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0019] see figure 1 , an embodiment provided by the present invention: a processing technology of a composite modified graphite negative electrode with good cycle stability, including step 1, raw material crushing; step 2, metal doping; step 3, surface oxidation; step 4, including Cover the shell; step five, pressing into pieces;
[0020] Wherein in the above-mentioned step 1, the graphite material is dropped into a plasma ball mill for ball milling, the plas...
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The invention discloses a processing technology of a composite modified graphite negative electrode with good cycle stability. The processing technology comprises the following steps: step 1, crushing raw materials; step 2, metal doping; step 3, surface oxidation; step 4, coating a shell; step five, tabletting; compared with an existing processing technology of a composite modified graphite negative electrode, the electrochemical performance of the graphite negative electrode is improved in a mechanical grinding and metal doping mode, in the first step, a grinding machine is a plasma ball mill, the rotating speed is 900-1500 r / min, the grinding time is 60-180 min, the average particle size of prepared graphite particles is 15-25 microns, and in the third step, the average particle size of the prepared graphite particles is 20-30 microns. The strong oxidant is one of HNO3, H2O2, CeSO4 and H2SO4, and the reaction temperature is 80-140 DEG C. According to the preparation method, surface oxidation is carried out through a chemical vapor deposition method, the irreversible capacity of the graphite negative electrode is effectively reduced, coating is carried out by adding Ag, Cu and Sb, the cycle life of the graphite negative electrode is prolonged, and surface defect sites of the graphite negative electrode are reduced.
Description
technical field [0001] The invention relates to the technical field of chemical energy, in particular to a processing technology for a composite modified graphite negative electrode with good cycle stability. Background technique [0002] Lithium-ion batteries using graphite materials as negative electrodes have certain safety and stability performance. At present, most graphite negative electrodes are processed with phenolic resin for primary modification, but the existing composite modified graphite negative electrode processing technology, the reduction is irreversible The effect of capacity is not good; the existing processing technology of composite modified graphite negative electrode still has the problem of relatively low cycle life; the existing processing technology of composite modified graphite negative electrode has low electrochemical performance of processed graphite negative electrode , unable to amplify the current. Contents of the invention [0003] The ...
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IPC IPC(8): H01M4/1393H01M4/04H01M10/0525
CPCH01M4/1393H01M4/0459H01M4/043H01M4/0428H01M4/0402H01M10/0525H01M2004/027Y02E60/10
Inventor 彭飞仰韻霖仰永军
Owner DONGGUAN KAIJIN NEW ENERGY TECH