Preparation method of trace Mo-doped lamellar lithium-enriched ternary positive electrode material

Abstract

The invention relates to a preparation method of a trace Mo-doped lamellar lithium-enriched ternary positive electrode material. The molecular formula of the prepared ternary positive electrode material is Li1.2(Mn0.54Ni0.13Co0.13)(1-x)MoxO2 (x is more than 0 and smaller than 1). The adopted preparation method is an organic co-precipitation method and comprises the steps of stirring an organic precipitator in a water bath with constant temperature, and dissolving the organic precipitator into an organic solvent so as to obtain a solution A; then dissolving soluble cobalt salt, nickel salt, manganese salt, molybdenum salt and lithium salt into deionized water to obtain a solution B; after thorough dissolution, dropwise adding the solution B into the solution A at a constant speed, reacting and drying, increasing the temperature of the obtained solid powder in a high-temperature tube furnace system, and calcining so as to obtain the trace Mo-doped lamellar lithium-enriched ternary positive electrode material. The material has uniform particles and regular polygonal morphology feature, and has relatively good electrochemical performance, the preparation process is relatively simple, and the ternary positive electrode material is suitable for industrialized scale production.

Description

technical field [0001] The invention belongs to the technical field of preparation of positive electrode materials for lithium ion batteries, and in particular relates to a method for preparing a layered lithium-rich ternary positive electrode material doped with a small amount of Mo. Background technique [0002] Lithium cobalt oxide (LiCoO 2 ), as the earliest commercial positive electrode material, is still widely used in lithium-ion batteries. Because the capacity of the material itself is only 50% of its theoretical capacity (140mAh / g), coupled with the lack of cobalt resources and environmental pollution problems, countries around the world Scholars have continued to conduct in-depth research, and successfully prepared other transition metal oxide cathode materials, such as lithium manganate (LiMnO 2 ), lithium iron phosphate (LiFePO 4 ), ternary materials (LiCo x Ni y mn 1-x-y O2) etc. [3] , but the relatively low specific energy or power has become the most fat...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing a layered lithium-rich ternary cathode material doped with a small amount of Mo in order to overcome the technical problems of the above-mentioned existing cathode materials such as low capacity and poor rate performance. The preparation method has a relatively simple process. , with low requirements on production equipment and the preparation of Mo-doped layered lithium-rich ternary cathode materials with excellent electrochemical performance

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