Method for preparing positive electrode material for lithium ion cell by spraying, combusting and pyrolyzing

Abstract

The invention provides a method for preparing a positive electrode material for a lithium ion cell by spraying, combustion and pyrolyzing. The method comprises the following steps of S1, proportionally adding a lithium source and a metal compound into a solvent and mixing them well, thus forming a mixed slurry precursor; and S2, spraying the mixed slurry precursor into a pyrolyzing furnace in a manner of spray, thus pyrolyzing or combusting the lithium source and the metal compound to form the required positive electrode material for the lithium ion cell, wherein the temperate of the pyrolyzing furnace is controlled to be 650-850 DEG C.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion positive electrode material, in particular to a method for preparing a lithium ion battery positive electrode material by spray combustion pyrolysis. Background technique [0002] As a new generation of green power sources, lithium-ion batteries have the advantages of high energy density, high voltage, low self-discharge, and no memory effect. They are widely used in mobile phones, cameras, notebook computers, power tools, electric bicycles and electric vehicles. . With the rapid development of electronic products, the energy and power requirements of lithium-ion batteries are getting higher and higher, and the cathode material of lithium-ion batteries is an important part of lithium-ion batteries and the main factor affecting the performance of lithium-ion batteries. [0003] At present, the methods for synthesizing cathode materials for lithium-ion batteries mainly include high-temperatu...

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Problems solved by technology

Among them, the preparation of positive electrode materials by high-temperature solid-state reaction method is difficult to control the morphology of the synthesized positive electrode materials because the mixing of raw materials is not uniform enough, the size of the materials is large, the particle size distribution is uneven, and impurities will be introduced in the process of mixing and grinding. , the improvement of the electrochemical performance of the cathode material is not obvious

Different from the high-temperature solid-state reaction method, the components of the liquid-phase precipitation method and the sol-gel method can achieve intermolecular mixing, which solves the problem of uneven mixing in the high-temperature solid-state reaction method. At the same time, the morphology of the synthesized powder is controllable. The grain size is small and the particle size distribution range is narrow, but the precipitation method and the gel-sol method have the disadvantages of complicated preparation process, many steps, a large amount of solvent and high production cost, and it is difficult to realize large-scale continuous industrial production

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