Process for preparing multilevel-structure silicon-lithium battery negative electrode from diatomite

Abstract

The invention relates to the technical field of new energy batteries, in particular to a process for preparing a multilevel-structure silicon-lithium battery negative electrode from diatomite. According to the process, the pore volume and the specific surface area of diatomite are increased by adopting a capacity expansion method, the content of active silicon and the number of pores are increased by adopting a deposition method, an active silicon dioxide multi-stage framework material is obtained, and then a silicon-silicon dioxide multi-stage framework material is prepared by adopting an aluminum-magnesium reduction method; and through high-temperature treatment under vacuum or inert gas protection, silicon and silicon dioxide are mutually fused to form the final Si-SiOx multi-stage framework material. The treated Si-SiOx multi-stage framework material is used as a negative electrode of a solid battery, the capacity of the solid battery is almost not obviously reduced after 1000 times of circulation, the circulation performance is greatly improved, the service life of the solid battery is prolonged; and meanwhile, the low-temperature aluminum-magnesium reduction method can be realized without high temperature, the energy consumption is reduced, and the industrial production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of new energy batteries, in particular to a process for preparing a negative electrode of a lithium-silicon battery with a multi-level structure from diatomite. Background technique [0002] Now with the popularization of new energy vehicles, the application of lithium batteries is getting higher and higher, but the main disadvantage of the existing liquid batteries is that the power storage density is too low, and the battery storage decays too much. The current battery technology uses liquid electrolytes to store electrical energy, and its energy density has reached the ceiling, and it is difficult to increase the density. And because the electrolyte is a chemical liquid, it is easy to cause electrolyte leakage, resulting in endless fire and explosion accidents. It can be seen that the liquid battery itself has hidden dangers of accidents. Replacing traditional flammable organic electrolytes with novel no...

AI Technical Summary

Problems solved by technology

However, the commercialization of the current solid-state batteries has been limited by the limited cycle life. The battery reserves are rapidly attenuated after charging and discharging a few times, and the frequent replacement of batteries has caused the high cost of use.

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