Preparation method of multilevel porous structure manganous-manganic oxide/carbon nanosheet negative electrode material for lithium-ion battery

Abstract

The invention provides a preparation method of a multilevel porous structure manganous-manganic oxide / carbon nanosheet negative electrode material for a lithium-ion battery. The method comprises the steps of firstly putting 6mmol of Mn(CH3COO)2.4H2O and 50ml of ethylene glycol reagent into a reflux device, keeping vigorous agitation at 170 DEG C and carrying out reflux reaction for 2 hours to generate a white coordination polymer precursor; carrying out washing, filtering and vacuum drying on a product for later use after cooling; and putting the coordination polymer precursor into a tube furnace with an inert gas, heating the tube furnace to 400-600 DEG C and burning for 2 hours to generate the multilevel porous structure manganous-manganic oxide / carbon nanosheet negative electrode material for the lithium-ion battery. A manganese-ethylene glycol coordination polymer with a designable and tunable structure is taken as a self-template precursor, and the multilevel porous structure metal oxide / carbon nanosheet negative electrode material for the lithium-ion battery is obtained by adopting an in-situ thermal decomposition method. The process is simple, and the obtained product is high in conductivity, high in specific capacity, good in cycle stability, excellent in high-rate discharge performance and high in energy density.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a preparation method of a multi-level porous trimanganese tetraoxide / carbon nanosheet lithium ion battery negative electrode material. Background technique [0002] As the global energy crisis becomes more and more serious, the development of clean, non-polluting and renewable new energy is an important direction of scientific and technological research today. Lithium-ion batteries have attracted increasing attention due to their advantages such as high energy density, stable voltage, long cycle life, low self-discharge rate, wide operating temperature range, safety and no memory effect. With the development of lithium-ion batteries in the field of electric vehicles and miniaturized electronic equipment, people put forward higher requirements for the current commercial lithium-ion batteries, hoping to further improve their energy density and safety performanc...

AI Technical Summary

Problems solved by technology

This method is not only complicated and energy-consuming, the reaction process is uncontrollable, the repeatability is poor, and the yield is very low, but also the carbon produced in the second step will partially fill the pores obtained in the first step, reducing the porosity of the composite material, thereby affecting its performance.

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