Nickel-manganese-based positive electrode material precursor and synthesis method of positive electrode material thereof

Abstract

The invention belongs to the field of lithium ion battery material preparation, and particularly relates to a nickel-manganese-based positive electrode material precursor and a synthesis method of a positive electrode material of the nickel-manganese-based positive electrode material precursor. The synthesis method comprises the following steps: 1) adding a soluble T salt, a soluble nickel salt and a soluble manganese salt into deionized water, and preparing a metal salt solution in proportion; 2) preparing a precipitant solution from sodium hydroxide, potassium hydroxide or lithium hydroxide;3) adding pure water, metal powder or metal oxide into a precipitation reactor, then respectively heating the metal salt solution and the precipitant solution, and then adding into the precipitationreactor for coprecipitation reaction, and filtering the reaction product while hot; and finally, stirring and washing the filtered precipitate with deionized water, and carrying out vacuum drying treatment to obtain the nickel-manganese-based positive electrode material precursor. The precursor and a lithium source are mixed, pre-roasted and calcined at high temperature, the prepared positive electrode material is perfect in layered structure, good in crystallization degree and stable in electrochemical performance, and the charge-discharge capacity of the positive electrode material reaches 200 mAh / g or above.

Description

technical field [0001] The invention belongs to the field of preparation of lithium-ion battery materials, and specifically relates to a method for synthesizing a binary, ternary, or quaternary or more multi-element positive electrode material NMT positive electrode material and its precursor with nickel and manganese as main components, specifically The invention is a nickel-manganese-based cathode material precursor and a method for synthesizing the cathode material. Background technique [0002] With the rapid development of new energy, high-capacity lithium-ion power batteries have become a hot spot in the development of global new energy production and technology. As the positive electrode material that affects the key part of lithium battery capacity, it is the focus of current technical research. The ternary positive electrode materials NCA and NCM, especially high-nickel NCA and NCM, have the advantages of large capacity and high voltage platform, and are currently t...

AI Technical Summary

Problems solved by technology

The method can solve the following technical problems: (1) improve the electrochemical stability and low charge and discharge capacity of nickel and manganese as the main components of binary, ternary, or quaternary and more multi-element positive electrode materials; (2) ) Difficult filtration of ternary cathode material precursors in the process of co-precipitation; (2) The problem of long co-precipitation reaction time and low yield; (3) Completely eliminate the recovery and pollution of heavy metal ions in the production process of ternary cathode materials question

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