Preparation method and application of high-nitrogen-doped porous graphite

Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method and application of high-nitrogen-doped porous graphite. Aiming at the problems that the nitrogen content in nitrogen-doped porous graphite prepared in the prior art is relatively low and the improvement of the performance of a graphite material is not expected, the invention provides a preparation method and application of high-nitrogen-doped porous graphite, and the preparation method comprises the following steps: putting porous graphite powder, a nitrogen source and a zinc-containing activating agent into a container, adding water to uniformly mix, and drying to obtain the high-nitrogen-doped porous graphite. And carrying out heat treatment in a tubular furnace under a nitrogen atmosphere, washing with hydrochloric acid and water in sequence, and drying to obtain the high-nitrogen-doped porous graphite. The zinc-containing activating agent is added and can serve as a nitrogen constraint reactor, a nitrogen-containing intermediate is stored in the thermal conversion process, and compared with the prior art that the nitrogen-containing intermediate is easily decomposed into volatile substances (generally in the form of ammonia), the nitrogen doping content in the porous graphite can be effectively increased.

Images