Preparation method of lithium nickel manganese oxide serving as high-voltage positive electrode material

Abstract

The invention relates to a preparation method of lithium nickel manganese oxide serving as a high-voltage positive electrode material. The preparation method comprises the following steps of using oxalate and carbonate as precipitants; preparing an oxalic acid / nickel manganese carbonate composite precursor by a co-precipitation method; pre-burning, dispersing into a lithium hydroxide water solution, spraying and drying; calcining at high temperature, so as to obtain the lithium nickel manganese oxide serving as the high-voltage positive electrode material. Compared with the traditional method using the hydroxide as the precipitant, the protection by inert gas is not needed, the strong alkaline is not needed, the requirement on equipment is low, and the production cost is reduced; compared with the traditional method using single oxalate or carbonate as the precipitant, the oxalate and carbonate are used as double precipitants, so that the compaction density of the material is effectively improved. The prepared high-voltage positive electrode material has the advantages that the material is in a sphere shape, the voltage is high, the compaction degree is high, the capacity is high, the doubling property is excellent, the material cost is low, and the like.

Description

technical field [0001] The invention belongs to lithium-ion battery cathode materials, in particular to a preparation method of lithium nickel manganese oxide, a high-voltage cathode material. Background technique [0002] Due to its high energy density, high voltage, high load capacity, no memory effect, no pollution, long cycle life, and excellent safety, lithium-ion batteries have become the focus of research and development of power materials around the world. Currently used cathode materials for lithium-ion batteries, such as LiCoO 2 , LiMn 2 o 4 、LiNi 1-x-y mn x co y o 2 、LiFePO 4 The working voltage of the battery is lower than 4V, which limits the power of the battery. [0003] Spinel lithium nickel manganese oxide LiNi 0.5 mn 1.5 o 4 It has the advantages of high energy density, high voltage, abundant resources, and low price. It can reversibly intercalate and deintercalate lithium ions around 4.7V, corresponding to Ni 2+ / Ni 4+ It has a high theoretic...

AI Technical Summary

Problems solved by technology

Using a single oxalate or carbonate as a precipitant to synthesize lithium nickel manganese oxide material has a low tap density, so that the energy density in the power battery is small; and using hydroxide as a precipitant to synthesize nickel manganese Although the tap density of lithium acid material is high, it needs the protection of inert gas, strong alkali and high requirements for equipment.

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