Lithium-rich manganese-based anode material and method for manufacturing same

Abstract

The invention discloses a lithium-rich manganese-based anode material and a method for manufacturing the same. The method includes steps of (a), providing mixed solution containing lithium compounds, nickel compounds and manganese compounds, optional titanium compounds, optional iron compounds, optional cobalt compounds or an optional combination of the titanium compounds, the ion compounds and the cobalt compounds; (b), adding complexing agents, catalysts and surfactants into the mixed solution to form pre-coagulated substances; and (c), calcining the pre-coagulated substances to obtain the lithium-rich manganese-based anode material Li[LixNiaMnbM1-a-b-x]O2 or a combination of lithium-rich manganese-based anode materials. The complexing agents, the catalysts and the surfactants are used for forming the pre-coagulated substances, the complexing agents contain resorcinol and formaldehyde, in the molecular formula of the lithium-rich manganese-based anode material, the M represents Ti, Fe, Co or a combination of the Ti, the Fe and the Co, the x is larger than 0 and is smaller than or equal to 0.4, the a is larger than 0 and is smaller than or equal to 0.5, the b is larger than or equal to 0.33 and smaller than or equal to 0.6, and a result of 1-a-b-x is larger than or equal to 0. The lithium-rich manganese-based anode material is of a multi-channel porous structure, is small in grain size, uniform in grain distribution, advanced in porosity and stable in electrochemical performance.

Description

technical field [0001] The invention belongs to the field of preparation technology of new energy materials, in particular to a preparation method of a lithium-rich manganese-based positive electrode material for a lithium-ion battery, more precisely a lithium-rich manganese-based Li[Li x Ni a mn b m 1-a-b-x ]O 2 The method of preparation of the material. Background technique [0002] Among metal oxide lithium-ion battery materials, LiCoO 2 Although it is one of the most mature materials for commercialization, it has problems such as poor safety, poor overcharge resistance, high cost, and environmental pollution; and LiNiO 2 It also has poor stability, which is likely to cause safety problems, and needs to be synthesized under an oxygen atmosphere. During the synthesis process, cation mixing and non-stoichiometric structural compounds are prone to occur. [0003] Manganese LiMnO 2 Although the positive electrode material is cheap, rich in resources, and high in theore...

AI Technical Summary

Problems solved by technology

[0015] Patent [201010266916.3] discloses the preparation of Li[Li x Ni a mn b m 1-a-b-x ]O 2 It can be seen that there are different degrees of differences in the performance of lithium-rich manganese-based lithium-ion battery cathode materials prepared by different gel systems.

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