Preparation method of multi-level structure carbon-coated zinc oxide quantum dot negative electrode material

Abstract

The invention discloses a preparation method of a zinc oxide quantum dot negative electrode material coated with multilevel structure carbon. The method comprises the following steps: firstly, a phenyl / pyridyl carboxylic acid compound and zinc salt are weighed at a mole ratio, and a coordination polymer of zinc and carboxylic acid is prepared by utilizing a hydrothermal / solvothermal method under the conditions that the pH value is 5-11, the temperature ranges from 80 DEG C to 180 DEG C, and the reaction time is 5-36h; secondly, the prepared polymer is calcined for 30min-120min at 400 DEG C to 800 DEG C in an inert atmosphere, so that the zinc oxide quantum dot (2-100nm) negative electrode material coated with multilevel structure carbon is prepared. The zinc oxide material prepared by the method has the following advantages: (1) the precursor purity is high, and the zinc oxide negative electrode material with high purity and high performance can be obtained after calcination; (2) a multilevel carbon structure array can play a role of'fixing frame' for zinc oxide, reduce the volume effect in a charge-discharge cycle process, improve the structure stability of zinc oxide, and further improve the electronic conductivity of zinc oxide, so as to improve the battery cycle performance.

Description

technical field [0001] The invention relates to the field of preparation of secondary battery materials, in particular to a preparation method of a multi-level structure carbon-coated zinc oxide quantum dot negative electrode material. Background technique [0002] In recent years, lithium-ion secondary batteries have developed rapidly, and their obvious advantages such as high voltage, high energy density, low self-discharge rate, and high cycle life make lithium-ion secondary batteries are playing an increasingly important role. It is precisely because lithium-ion secondary batteries are more and more widely used that people have higher and higher requirements for their performance, including energy density, cycle life and safety performance of batteries. Material improvements. At present, the anodes of commercial lithium-ion batteries are generally carbon materials such as graphite and carbon fiber, but their relatively low theoretical electrochemical capacity, unsatisf...

AI Technical Summary

Problems solved by technology

At present, the anodes of commercial lithium-ion batteries are generally carbon materials such as graphite and carbon fiber, but their relatively low theoretical electrochemical capacity, unsatisfactory initial discharge efficiency, and poor cycle performance make it urgent to seek new anode materials to replace carbon materials.