High-potential lithium ion battery cathode material LiNi<0.5-x>MxMn<1.5-y>SiyO4 and preparation method thereof

Abstract

The invention belongs to the field of lithium ion batteries, and specifically provides a high-potential lithium ion battery cathode material LiNi<0.5-x>MxMn<1.5-y>SiyO4 and a preparation method thereof, wherein M is Mg, Zn, Cu and V, x is greater than 0 and smaller than or equal to 0.1, y is greater than 0 and smaller than or equal to 0.2, so that the defect that electrochemical circulating performance is poor when the LiNi0.5Mn1.5O4 is under high potential is overcome. An element Si is adopted to replace part of an element Mn, and metal M is adopted to replace part of an element Ni, so that the lithium ion battery cathode material LiNi<0.5-x>MxMn<1.5-y>SiyO4 has relatively high working voltage, relatively high energy density and excellent circulating stable performance after bulk-phase cooperative doping is realized, and therefore, large-multiplying-power charging and discharging needs can be met; and moreover, a mixed complexing agent is adopted to improve a sol-gel preparation process; the prepared product is high in purity, is high in chemical uniformity, is high in crystallization quality, is fine and uniform in product particles, is excellent in electrochemical performance, is low in manufacturing cost, and is suitable for large-scale industrial production.

Description

Technical field [0001] The invention belongs to the field of lithium-ion batteries, and relates to a lithium-ion battery anode material and a preparation method thereof, and specifically is a lithium-ion battery anode material LiNi 0.5-x M x Mn 1.5-y Si y O 4 And its preparation method, where M=Mg, Zn, Cu, V and other metal elements, 0 <x≤0.1,0 <y≤0.2. Background technique [0002] With the two major issues of energy crisis and environmental pollution becoming increasingly prominent, the development and utilization of clean and renewable new energy has become an important measure to solve these two major issues. In recent years, new energy electric vehicles have developed rapidly. It replaces fossil fuels with clean electric energy, which will undoubtedly reduce the burden on the environment, while the rapid development of electric vehicles depends on the development of battery technology. Lithium-ion battery is a rechargeable secondary battery. Because of its high energy d...

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Problems solved by technology

[0005] The object of the present invention is to aim at lithium-ion battery cathode material spinel type lithium nickel manganese oxide (LiNi 0.5 mn 1.5 o 4 ) has the disadvantage of poor electrochemical cycle performance at high potentials, and provides a bulk composite doped modified spinel lithium-ion battery positive electrode material LiNi 0.5-x m x mn 1.5-y Si y o 4 And preparation method thereof, wherein M=Mg, Zn, Cu, V, 0

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