Method for preparing natural spherical plumbago with circular reshaping classification

Abstract

The invention relates to a method for preparing the graphite powder, in particular relates to a method for preparing the graphite powder that is applied to the cathode of the lithium-ion secondary battery, which aims at overcoming the weaknesses of the prior natural spherical graphite powder preparation method that the craftwork is complicated, the quality of the obtained product is uniform and the production efficiency is low, so that a method for preparing the natural spherical graphite in the cycling shaping classification way. The natural crystalline flake graphite is primarily crashed in a mechanical crashing machine, and is cycled for milling, shaping and classification in a plurality of shaping classification machines. The method has simple craftwork and high control precision of the classification; the quality of the prepared natural spherical graphite powder is stable; the foreign matters in the graphite can be thoroughly removed; the content of the fixed carbon is high; at the same time, the production efficiency is improved, and the method is free from polluting the production environment.

Description

technical field

[0001] The invention relates to a preparation method of graphite powder, in particular to a preparation method of graphite powder used in negative electrodes of lithium-ion secondary batteries. Background technique

[0002] With the global energy shortage, the energy-saving lithium battery industry has achieved unprecedented development, and various energy-consuming batteries are gradually replaced by lithium batteries. Lithium-ion secondary batteries are widely used due to their high voltage, good safety performance, no memory effect, long cycle life and no environmental pollution. With the development of portable electrical products, people have higher and higher requirements for the batteries used in them, which are mainly reflected in small size, long power consumption time, high-speed charging and discharging performance, and long service life, especially in the past two years. The power batteries required by electric bicycles, electric vehicles, and co...