Preparation method for flower-shaped nickel-cobalt-manganese lithium ion battery positive material

Abstract

The invention discloses a preparation method for a flower-shaped nickel-cobalt-manganese lithium ion battery positive material. The preparation method comprises the steps of preparing a solution withurea as a precipitant, sodium dodecyl sulfate as a surfactant, nickel chloride as a nickel source, cobalt chloride as a cobalt source, manganese chloride as a manganese source, and deionized water asa solvent; adding the solution into a high-pressure reaction kettle for hydrothermal reaction; separating solid from liquid after reaction, and then washing to obtain a flower-shaped nickel-rich precursor; adding the washed product into a co-precipitation reaction kettle, slowly adding the manganese-cobalt solution and the precipitant to react, so as to enable cobalt and manganese elements to slowly settle on the surface of the solid to wrap the flower-shaped precursor; washing and drying, then mixing the wrapped precursor with a lithium source, calcining under a condition of introducing oxygen, so as to obtain lithium ion battery positive material nickel-cobalt-manganese. The preparation method has the advantages of synthesizing the nickel-cobalt-manganese precursor through hydrothermal reaction, ensuring that nickel, cobalt and manganese elements are distributed uniformly in an atomic level compared with conventional solid phase mixing, and preventing element segregation.

Description

technical field [0001] The invention relates to a preparation method of nickel-cobalt-manganese, a flower-shaped cathode material for a lithium ion battery. Background technique [0002] With the rapid development of my country's economy, the demand for new battery materials continues to increase, coupled with the strong demand for new, efficient and environmentally friendly battery materials for mobile phones, notebook computers, digital cameras, video cameras, automobiles and other products, my country's new battery material market will continue to expand. As the future development direction of batteries, lithium-ion batteries have broad prospects for the development of the positive electrode material market. At the same time, the promotion of smart phones and the large-scale commercialization of new energy vehicles will bring new opportunities for lithium-ion battery positive electrode materials. In recent years, policies related to lithium-ion batteries have been promulg...

AI Technical Summary

Problems solved by technology

The solid-phase method has a high yield, but the disadvantage is that the elements synthesized by the solid-phase method are unevenly distributed and the particle size is different, so stable electrochemical performance cannot be guaranteed.

In addition, the sintering temperature is also a big problem. The temperature fluctuation range is narrow. If the temperature is low, it is difficult to ensure the complete reaction. If the temperature is high, it is easy to decompose.

Although the sol-gel method can solve this problem, the process is complicated, the production conditions are harsh, the energy consumption is high, and the output is low, so it cannot meet the needs of the market

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