Cerium-zirconium co-doped porous structure positive electrode material and preparation method thereof

Abstract

The invention provides a cerium-zirconium co-doped porous structure positive electrode material and a preparation method thereof. The method comprises the following steps: (1) preparing a ternary solution, a cerium-zirconium blended salt solution, a precipitant solution and a complexing agent solution for later use; (2) preparing a base solution and stirring; (3) injecting the ternary solution, the mixed solution of the cerium salt and the zirconium salt, the precipitant solution and the complexing agent solution into the base solution, carrying out reaction of the stage I and the stage II, and stopping feeding until the reaction reaches the target particle size; (4) centrifugally washing, drying, screening and deironing the reacted slurry to obtain a precursor; and (5) mixing the precursor with a lithium source, and sintering to obtain the positive electrode material. According to the preparation method, the blended cerium-zirconium salt solution is doped into the ternary solution byutilizing liquid-phase doping, so that doped elements are uniformly distributed, and the battery cycle performance of the material is improved by utilizing the synergistic effect of the doped elements; the positive electrode material with a pore structure, high purity and good performance is prepared through process control in different reaction stages.

Description

technical field [0001] The invention belongs to the field of electrode materials and electrochemical energy storage, and specifically relates to a positive electrode material with a cerium-zirconium co-doped porous structure and a preparation method thereof. Background technique [0002] Cathode material is the most important part of lithium-ion batteries, which is related to the performance parameters and product prices of lithium-ion batteries such as capacity, rate, safety performance, cycle times, and service life. [0003] At present, cathode materials with porous structure have been paid more and more attention and researched. Porous cathode materials have the following advantages: On the one hand, porous materials can store more electrolyte to improve the cycle performance during charge and discharge; its safety performance. [0004] The pursuit of high capacity has led to the development of ternary materials in the direction of high nickel, but the cycle performanc...

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Problems solved by technology

At the same time, adding other substances will increase the production process and auxiliary materials, and the manufacturing cost of the product will further increase

[0008] The sintering temperature of high-nickel materials is relatively low, and the distribution of elements in solid-phase doping is difficult to be uniform at low temperatures, which will reduce the battery performance of the material

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