Multi-element anode lithium battery material suitable for high voltage and preparation method for material

Abstract

The invention provides a multi-element anode lithium battery material suitable for high voltage, and a preparation method for the material. The multi-element anode lithium battery material has the feature of a single-particle structure, and the particle size distribution is within the range of 0.5-15 mum; the chemical formula of the nickel-cobalt-manganese multi-element lithium battery anode material with composite doping elements is LiNiXCoyMnzMaNbO2, wherein the value range of x, y and z is that: x is not smaller than 0.2 and not larger than 0.9, y is not smaller than 0 and not larger than 0.4, z is not smaller than 0.1 and not larger than 0.5, 1-x-y-z equals to a+b, is larger than 0, and is not larger than 0.05, M is any one selected from titanium, aluminum, ferrum, vanadium, silicium, fluorine, lanthanide and actinide elements, and N is any one selected from calcium, magnesium, aluminum, zirconium, ferrum and titanium. Based on the preparation of the single-particle multi-element lithium battery anode material, the method of compositing specific doping elements is adopted, the structural stability under high voltage charge and discharge is improved and the cycle performance of the material is effectively improved without changing the electrochemical performance of the material.

Description

technical field [0001] The invention relates to the field of preparation of positive electrode materials for lithium ion batteries, in particular to a multi-element positive electrode lithium battery material suitable for high voltage and a preparation method thereof. [0002] Background technique [0003] At present, lithium-ion batteries are widely used in portable electronic devices such as mobile phones, notebook computers, and digital cameras due to their high voltage, high energy density, and long cycle life. In recent years, various electronic products have gradually developed towards miniaturization, intelligence and functional diversification, which put forward higher requirements for the energy density of lithium-ion batteries. [0004] Increasing the charging voltage of the battery can significantly increase the capacity of the battery without increasing the active material in the battery, and is one of the most effective ways to increase the energy density of th...

AI Technical Summary

Problems solved by technology

[0005] However, nickel-cobalt lithium manganese oxide multi-element cathode material still has its own defects, especially under high voltage, the interface has poor compatibility with the electrolyte due to the presence of free lithium, resulting in poor cycle performance, and the existing lithium-ion multi-element anode Most of the materials are polycrystalline structures, and the structure is unstable under high voltage, which intensifies the reaction with the electrolyte and deteriorates the cycle performance

Therefore, the patent number is CN200810046300.8, which discloses "a nickel-cobalt-manganese multi-component doped lithium-ion battery positive electrode material and its preparation method", which prepares a non-agglomerated single-particle material and improves the stability of the particles for charging and discharging under high voltage. , but still deteriorates the cycle due to the layered structure and residual free lithium on the surface

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