Doped monocrystal multi-component material for lithium ion batteries and preparation method of such doped monocrystal multi-component material

Abstract

The invention belongs to the technical field of anode materials for lithium ion batteries and particularly discloses a doped monocrystal multi-component material for lithium ion batteries and a preparation method of such doped monocrystal multi-component material. The doped monocrystal multi-component material and the preparation method thereof have the advantages that nickel-cobalt-manganese ternary materials are modified, and M-source metals are doped when a precursor is prepared to decrease the material sintering temperature and improve material tapping density, so that the mixed arrangement degree of Ni<2+> in a Li<+> layer is weakened obviously; through high-temperature sintering and tempering processes, the precursor of the multi-composite material, prepared through a coprecipitation method, is more stable in crystal structure, metal ions in the material are inhibited from dissolving through surface coating, side reaction between the metal ions and electrolyte is inhibited, and stability and electrochemical performance of an active material are further enhanced; a doped monocrystal multi-component material finished product is stable in crystal structure, high in safety and compaction density and excellent in rate capability and cycle performance, so that specific capacity and charge-discharge voltage of the material are further enhanced; the preparation method is small in doping quantity, simple to operate, easy to control, widely applicable and suitable for large-scale production.

Description

technical field

[0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a kind of single crystal multi-component positive electrode material and a preparation method thereof. Background technique

[0002] With the increasing global energy shortage and environmental protection requirements, the development and promotion of electric vehicles has attracted more and more attention from governments around the world, and lithium-ion power batteries, as the core components of power systems, have also received more and more attention. The composition of lithium-ion batteries mainly includes positive electrodes, separators, electrolytes, negative electrodes, and shells. At present, the negative electrode materials mainly use graphite materials with relatively low potential and high capacity, and the price is relatively low. Therefore, the research on cathode materials is one of the key technologies fo...

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