Lithium-ion power battery anode material lithium manganate and preparation method thereof

Abstract

The invention discloses lithium-ion power battery anode material lithium manganate and a preparation method thereof. The molecular formula of the lithium manganate is Li<1+x>Mn<2-y>TayO4 / zAl2O3, wherein 0<x<=0.2, 0<y<=0.2, and 0<z<=1.0. The preparation method includes the steps of proportionally mixing a lithium source compound, a manganese source compound and a tantalum element additive and subjecting the lithium source compound, the manganese source compound and the tantalum element additive to ball milling and high-temperature roasting to obtain the lithium manganate; and dispersing the lithium manganate in a dispersing agent, adding aluminum stearate for reaction to obtain precipitate, and finally subjecting the precipitate to two-section roasting, second annealing, cooling and sieving to obtain the lithium-ion power battery anode material lithium manganate. By means of a composite metal dual-doping mechanism, doping vario-property of two elements of tantalum and lithium is performed to the lithium manganate, a John-Teller effect is inhibited, and normal temperature and high temperature cycle performances of a lithium manganate material are greatly improved; and by means of sectional roasting and multi-time annealing processes, controllability of particle diameters and specific surface areas is achieved, tap density and processing performances of the material are improved, and simultaneously, oxygen defect levels during material sintering are effectively reduced.

Description

technical field

[0001] The invention relates to lithium manganate, a cathode material for lithium-ion power batteries, and a preparation method thereof, belonging to the field of cathode materials for batteries. Background technique

[0002] With the continuous expansion of the application field of lithium batteries and the continuous development of new processes, the demand for lithium batteries in the world will also increase accordingly. As the development of power lithium batteries in particular has been paid more and more attention, the power supply field represented by electric vehicle applications has developed the most rapidly. However, the selection conditions for the positive electrode materials of high-power lithium-ion power batteries are harsh, and the positive electrode materials of traditional small lithium-ion batteries cannot meet the needs of power batteries. At present, lithium cobalt oxide still occupies a relatively large proportion in commercialized li...

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