Lithium silicate-coated Ni-Co lithium aluminate positive electrode material and preparation method thereof

Abstract

The invention relates to a lithium silicate-coated Ni-Co lithium aluminate positive electrode material and a preparation method thereof. The mass percent of lithium silicate in the material accounts for 1-10wt%, a coating layer with a thickness being 2-20 nanometers is formed from the silicon silicate and is coated on Ni-Co lithium aluminate, and the positive electrode material is a spherical particle with a grain size being 5-15 micrometers. The method comprises the following steps of (1) adding a silicon source into an organic solvent, performing uniform stirring, adding water, adding Co-Alnickel hydroxide, performing heating and stirring reaction, and performing drying to obtain silicon dioxide-coated Co-Al nickel hydroxide precursor powder; and (2) grinding and uniformly mixing the silicon dioxide-coated Co-Al nickel hydroxide precursor powder and a lithium salt, placing the mixture in a tubular furnace, and performing two-segment calcination under an oxidization atmosphere, thereby obtaining the lithium silicate-coated Ni-Co lithium aluminate positive electrode material. The positive electrode has relatively good cycle stability and large-rate discharging performance; and bythe method, the problem of lithium resided on a surface during conventional coating can be effectively reduced, and the method is low in cost and simple in process and is suitable for industrial production.

Description

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AI Technical Summary

Benefits of technology

This patented technology describes how we assemble Lithium Silicates (LSC), Coating Ni Cells: By adding LSCO onto LiCoO2 particles during manufacturing processes or by mixing them together after they are made, this new type of particle becomes more stable when used in batteries compared to traditional materials like NMC's. Additionally, these composites have improved charge transfer kinetic properties over conventional electrode materials due to their enhanced ability to store lithiions inside porosity structures formed through crystal growth techniques such as solid state reaction methods. Overall, this innovation improves both safety and efficiency of redox flow batteries.

Problems solved by technology

This patented technical problem addressed in this patents relates to finding ways for reducing unwanted reactions between anode active substances such as cathodes containing lithium and transition elements like iron, while also ensuring better cycling properties over time without losing any significant amounts of stored electrical power from being taken out through ventilation systems.

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