Preparation method of nano-ternary complex lithium-ion battery cathode material

Abstract

The invention provides a preparation method of a nano-ternary complex lithium-ion battery cathode material, which comprises the following steps: 1) respectively dissolving soluble Li, Ni, Co and Mn compounds into deionized water according to the molar ratio of 1: x: y: z, mixing four kinds of solution, fully stirring and obtaining the uniform mixed solution, wherein x is not less than 0 and not more than 0.5, y is not less than 0.2 and not more than 0.6, z is not less than 0 and not more than 0.5, and x plus y plus z is equal to 1; 2) adding citric acid into the mixed solution as a metal ion chelating agent; and 3) transferring the mixed solution into a water bath pot for heating, carrying out full reaction, forming sol, carrying out vacuum drying on the obtained sol, then carrying out high-temperature sintering in air and obtaining the cathode material with the primary particle diameter of below 100nm and the molecular formula of LiNixCoyMnzO2. Compared with the prior art, the preparation method can prepare the LiNixCoyMnzO2 ternary material with primary particles of below 100nm by adopting the sol-gel method.

Description

technical field [0001] The invention belongs to the field of energy material preparation technology, and relates to a preparation method of a nanometer ternary composite lithium ion battery cathode material. Background technique [0002] The layered ternary material Li-Ni-Co-Mn-O has the advantages of high specific capacity, low cost, stable cycle performance, and good safety, and can effectively make up for LiCoO 2 , LiNiO 2 , LiMnO 2 Due to their respective shortcomings, the development of ternary materials has become a research hotspot in the field of cathode materials. The current process route for synthesizing the ternary system is to use a high-temperature solid-phase method, which is refined and mixed by mechanical means and then sintered at a high temperature to obtain this type of positive electrode material. The high-temperature solid-phase method is the most widely used in the field of material preparation because of its simple equipment and process, and is easy...

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Problems solved by technology

The current process route for synthesizing the ternary system is to use a high-temperature solid-phase method, which is refined and mixed by mechanical means and then sintered at a high temperature to obtain this type of positive electrode material. The high-temperature solid-phase method is the most widely used in the field of material preparation because of its simple equipment and process, and is easy to industrialize. Widely used, but the high-temperature solid-phase method of mechanical mixing has the following disadvantages: the uniformity of mechanical mixing is limited, which is not conducive to the uniform mixing of effective elements to form a solid solution with uniform properties during sintering; it affects the performance of materials, the particle size distribution is not concentrated, mechanical refinement and Impurities are easily introduced during the mixing process, and high reaction temperature and long reaction time are required to achieve sufficient diffusion of effective elements, which requires high energy consumption

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