Lithium ion battery negative electrode material with nanometer silicon reserved in carbon shell and fabrication method and application of lithium ion battery negative electrode material
A technology of negative electrode material and production method, which is applied in the direction of battery electrodes, lithium batteries, negative electrodes, etc., can solve the problems of high cost, powdering and falling off of active materials, easy agglomeration of nano-silicon, and achieve the effect of avoiding the pretreatment process
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Embodiment 1
[0039] The preparation method of the lithium battery silicon carbon negative electrode material of the present embodiment comprises the following steps:
[0040] (1) Press-filter the waste silicon powder produced during the diamond wire cutting process in the silicon wafer production process into a cake; the filter cake is composed of elemental silicon micropowder with a particle size of 1-3 μm, organic cooling liquid and water; according to the previous According to the experience in the industry, the organic residues in the filter cake, the proportions of water and elemental silicon micropowder are 5-10%, 40-50%, and 50-60% respectively; The solid content is between 10-20% to ensure that the heat in the subsequent oxidation process is absorbed by the solution, but does not overflow;
[0041] (2) Dissolving the filter cake in the step (1) in water, and estimating that the solid content of the elemental silicon powder is about 20%.
[0042] (3) Add potassium persulfate oxidiz...
Embodiment 2
[0051] The difference between this embodiment and embodiment 1 is that in step (2), the solid content of the elemental silicon micropowder in the solution is 10%, and the rest are the same.
[0052] Compared with the traditional lithium battery (graphite negative electrode material, the specific capacity is 372mAh / g), the lithium battery silicon carbon packaged by the present invention adopts the specific capacity and cycle performance of the material tested by the constant current charge and discharge method, and the test detection result is the specific capacity of the negative electrode material. The capacity is 1300mAh / g, which is 3 times the specific capacity of graphite anode materials. After 100 cycles, the specific capacity is stable at 1120mAh / g, without rapid decay.
Embodiment 3
[0054] The difference between this embodiment and embodiment 1 is that in step (4), the activating substance of the oxidizing agent in the solution is cobalt nitrate, and the rest are the same.
[0055] Compared with the traditional lithium battery (graphite negative electrode material, the specific capacity is 372mAh / g), the lithium battery silicon carbon packaged by the present invention adopts the specific capacity and cycle performance of the material tested by the constant current charge and discharge method, and the test detection result is the specific capacity of the negative electrode material. The capacity is 1300mAh / g, which is 3 times the specific capacity of graphite anode materials. After 100 cycles, the specific capacity is stable at 1120mAh / g, without rapid decay.
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