Silicon-based negative electrode material, preparation method thereof, and related products

Abstract

The application provides a silicon-based negative electrode material and its preparation method, and related products. The silicon-based negative electrode material includes a number of silicon-based composite particles, and the silicon-based composite particles include a silicon-based material and a coating layer. The coating layer A plurality of coating particles are included, and the coating particles are coated on at least part of the surface of the silicon-based material by atomic layer deposition. The coating layer can effectively coat the silicon-based material, and evenly wrap the coated particles on the surface of the silicon-based material, so as to achieve the effect of restraining the expansion of the silicon-based material and isolating the contact between the silicon-based material and the outside world, improving the The cycle stability of the silicon-based negative electrode material, when the silicon-based material is applied to the battery, can improve the cycle performance of the battery, and can also make the capacity retention rate of the battery high.

Description

Silicon-based negative electrode material, preparation method thereof, and related products technical field The application relates to electronic technology field, be specifically related to a kind of silicon-based negative electrode material and preparation method thereof, and related products Taste. Background technique At present, silicon has an ultra-high theoretical specific capacity (4200mAh / g) and a lower delithiation potential, and the voltage plateau of silicon Slightly higher than graphite, it is difficult to cause surface lithium precipitation during charging, and the safety performance is better. Silicon becomes more and more carbon-based anode for lithium-ion batteries popular. However, during the cycle process of the silicon-based negative electrode, the continuous insertion and extraction of lithium ions forms a solid solution with silicon, and the During the process, the volume of silicon will be seriously expanded, and it will also lead to continu...

AI Technical Summary

Problems solved by technology

[0003] However, during the cycle of the silicon-based negative electrode, the continuous intercalation and extraction of lithium ions forms a solid solution with silicon, which will cause serious volume expansion of the silicon during charge and discharge, and also lead to continuous reaction with the electrolyte, resulting in continuous deterioration of the negative electrode. The later decay speed is faster than that of graphite

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