A kind of in-situ precipitated oxide-coated positive electrode material for lithium-ion batteries and its preparation method and application

Abstract

The invention relates to the field of lithium ion battery positive electrode materials, and particularly to a preparation method for a novel in-situ precipitating oxide-coated lithium ion battery positive electrode material. The preparation method for the novel in-situ precipitating oxide-coated lithium ion battery positive electrode material comprises the following steps of: adding a raw material of a cladding material in a preparation process of a precursor of an oxide positive electrode material; and then during a high temperature heat treatment, enabling the cladding material to be subjected to oxygenolysis and in-situ precipitation on a substrate surface of the oxide positive electrode material, so that cladding modification can be carried out on the substrate surface of the oxide positive electrode material, thus obtaining an oxide-coated oxide composite positive electrode material. According to the in-situ precipitating oxide-coated modified lithium ion battery positive electrode material, a first charge and discharge capacity can reach up to 295mAh / g; and after 300 times of circulation, the capacity retention ratio can reach 100%. The modified lithium ion battery positive electrode material has the advantages of excellent electrochemical performance and broad application prospects.

Description

technical field

[0001] The invention relates to the field of lithium-ion battery cathode materials, in particular to a preparation method for in-situ precipitation of oxide-coated lithium-ion battery cathode materials. Background technique

[0002] With the development of science and technology and the progress of human society, the problems of energy depletion and environmental pollution have become increasingly prominent. The development of new efficient and clean energy conversion, storage technologies and energy utilization methods has become the key to solving these problems and realizing the sustainable development of human society. Due to its high working potential, high specific energy density, high specific power, high operating temperature range, long cycle life and good environmental friendliness, lithium-ion batteries are widely used in the field of portable mobile electronic equipment, power tools, energy storage devices, electric vehicles and hybrid vehicles ar...

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