Multi-modified nickel-cobalt-manganese anode material and preparation method thereof

Abstract

The invention relates to a multi-modified nickel-cobalt-manganese anode material and a preparation method thereof. The technical scheme is that the method comprises the steps: dissolving aluminum saltin isopropanol at a concentration of 0.05-0.1 mol / L to obtain solution I; adding a nickel-cobalt-manganese anode material to the solution I at the mass ratio of 1: (50-53) of the aluminum salt to thenickel-cobalt-manganese anode material, performing stirring, drying and heat-treating to obtain A-NCM; adding an acidified carbon nanotube to tertiary butanol at a concentration of 2 to 3 kg / m3 to obtain solution II; adding A-NCM to solution II at the concentration of 40-45kg / m3 to obtain solution III; adding a polymer conductor to the solution III at a mass ratio of (1 to 2): 100 of the polymerconductor to an A-NCM anode material to obtain solution IV; adding the solution IV dropwise to liquid nitrogen to obtain spherical beads, and performing cooling and drying to prepare a heavily modified nickel cobalt manganese anode material. The method is convenient to operate and easy to industrialize, and a manufactured product is excellent in rate performance, structural stability and cycle performance.

Description

technical field [0001] The invention belongs to the technical field of nickel-cobalt-manganese cathode materials. In particular, it relates to a multi-modified nickel-cobalt-manganese cathode material and a preparation method thereof. Background technique [0002] Nickel-cobalt-manganese ternary material (LiNi x co y mn z o 2 , where x+y+z=1, denoted as: NCM) is a new type of lithium-ion battery cathode material developed in recent years, due to the full integration of high specific capacity of lithium nickel oxide, good cycle performance of lithium cobalt oxide and manganese acid Lithium has the advantages of high safety and low cost, and the use of molecular level doping, coating, and surface modification to synthesize composite cathode materials such as manganese, nickel, and cobalt, etc., has become a research hotspot in recent years because of its good application prospects. one. [0003] Compared with lithium iron phosphate and lithium cobalt oxide, nickel-cobalt...

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Problems solved by technology

[0003] Compared with lithium iron phosphate and lithium cobalt oxide, nickel-cobalt-manganese ternary materials have the advantages of moderate cost and high specific capacity, but there are still some problems that need to be solved urgently. The main problems include: low electronic conductivity; poor stability at large rates; high voltage Poor cycle stability; mixed cations (especially nickel-rich ternary); poor high and low temperature performance, etc.

However, the simple oxide coating fails to take into account the dual effects of preventing the HF generated by the electrolyte from corroding the material and improving the conductivity of the material.

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