Lithium battery cathode material and preparation method thereof as well as lithium battery

Abstract

The application relates to a lithium battery cathode material. The lithium battery cathode material is spinel lithium nickel manganese oxide; the surface of spinel lithium nickel manganese oxide is coated with a coating; the coating comprises LiaBbOc and LiMnBO3; the structural formula of the spinel lithium nickel manganese oxide is LiM(x+y)Ni(0.5-x)Mn(1.5-y)O4, wherein the M is selected from at least one of Co, Al, Cr, Fe, Mg, Zr or Ti, the x is not less than 0 and is less than 0.2, and the y is not less than 0 and is less than 0.2; the LiaBbOc is specifically at least one of LiBO2, LiB3O5,LiB5O8, LiB7O11, Li2B4O7, Li3BO3, Li3B5O9, Li3B7O12, Li4B2O5 or Li4B6O11. The spinel lithium nickel manganese oxide and compounds of boron are mixed and sintered, so that the circling stability of the spinel lithium nickel manganese oxide is improved and the dissolution of manganese of the spinel lithium nickel manganese oxide in an electrolytic solution is restrained. An improved process is suitable for all spinel lithium nickel manganese oxide cathode materials and is simple and feasible, the preparation costs are low, the reproducibility is great, and the process is convenient for large-scale industrial production.

Description

Technical field [0001] This application relates to the technical field of lithium ion batteries, and in particular to a lithium battery cathode material and a preparation method thereof, and a lithium battery. Background technique [0002] Compared with traditional lead-acid batteries, nickel-hydrogen batteries and other secondary batteries, lithium-ion batteries have the advantages of high energy density, high output voltage, low self-discharge, no memory effect and environmental friendliness, and have been widely used and developed. The performance of key materials for power and energy storage lithium-ion batteries is the ultimate decisive factor for battery performance. The research on cathode materials has always been a hot spot for scientists. LiCoO 2 , LiMnO 4 , LiFePO 4 , LiNi x Co y Mn 1-x-y O 2 And other cathode materials have been extensively studied. However, the lithium-ion battery system assembled by these positive electrode materials has defects such as low specifi...

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Problems solved by technology

[0008] The process of the above method is relatively complicated, which makes it difficult to carry out industrial production. At the same time, there is no corresponding method to solve the dissolution of metal manganese. Therefore, it is urgent to find a simple and easy improvement of spinel lithium nickel manganese oxide cathode material. The positive method makes the spinel lithium nickel manganese oxide positive electrode material have high cycle stability, and can inhibit the dissolution of metal manganese in the electrolyte, so as to meet the requirements of power batteries

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