Preparation method of lithium-enriched magnesium-based anode material of lithium ion battery

Abstract

The invention discloses a preparation method of a lithium-enriched magnesium-based anode material of a lithium ion battery. The preparation method comprises the steps of: depositing cobalt manganese oxide by using an electrodeposition method, and dissolving the cobalt manganese oxide and lithium chloride in a mixed way to obtain lithium cobalt manganese oxide powder; dissolving the lithium cobalt manganese oxide powder and the lithium chloride in a mixed way and heating to obtain lithium-enriched lithium cobalt manganese oxide powder; adding the lithium-enriched lithium cobalt manganese oxide powder into an aqueous solution of aluminum chloride, and standing to obtain aluminum-hydroxide-cladded aluminum-enriched lithium cobalt manganese oxide; sintering to obtain an alumina-cladded lithium-enriched lithium cobalt manganese oxide material; and preparing the anode material. According to the invention, by adoption the alumina-cladded lithium cobalt manganese oxide material as an anode active substance, while higher energy density is achieved, phase change of the anode material and the dissolution loss of important metal are inhibited, and the anode material has good cyclic stability, and is high in specific capacity, good cyclic performance and long service life when applied to the lithium ion battery.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery, in particular to a lithium-rich manganese-based positive electrode material of a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion battery, as a new type of secondary battery, has the characteristics of high specific capacity, high voltage, and good safety, and is widely used in the driving power supply of electric vehicles, mobile phones, and notebook computers. The cathode material is the key material in lithium-ion batteries. The cathode materials of lithium-ion batteries, which are widely used at present, are undergoing continuous updating and improvement. With the development of science and technology, various digital products using lithium-ion batteries are updated and upgraded very quickly, and most of the products tend to be portable and economical. This requires lithium-ion battery products to d...

AI Technical Summary

Problems solved by technology

Lithium ions in this type of lithium-rich materials are represented by Li 2 The form of O is released from the unit cell, and this part of lithium ions cannot be fully re-intercalated into the original unit cell during discharge, resulting in a large first-time irreversible capacity of this type of layered material and a low first-time Coulombic efficiency.

In addition, the cycle stability of this type of material is poor