A preparation method of single crystal ternary lithium battery cathode material and lithium ion battery

Abstract

The invention discloses a preparation method of a single crystal ternary lithium battery cathode material and a lithium ion battery, and relates to the technical field of lithium batteries. The methodcomprises the following steps of: uniformly mixing a manganese sulfate solution, a nickel nitrate solution and a cobalt sulfate solution, slowly adding the mixed solution, a sodium carbonate solutionand ammonia water into a reaction container by using a peristaltic pump, and performing reacting to obtain a ternary carbonic acid precursor; heating and calcining the ternary carbonic acid precursorto obtain an oxide precursor; performing wet ball milling for the oxide precursor with LiF and a dopant to obtain a mixture, performing temperature rise of the mixture, performing pre-calcining of the mixture for 2-5h, then performing temperature rise to a temperature range of 750-800 DEG C, and performing calcining for 8-10h; performing mixed calcining of the calcined product and Li2CO3, and performing natural cooling. The molar ratio of nickel, manganese and cobalt in the single crystal ternary lithium battery cathode material is very close to the designed component ratio, the single crystal ternary lithium battery cathode material has a good cyclic voltammetry performance, the coulombic efficiency is more than 93 percent, and the market application prospect is wide.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a preparation method of a single crystal ternary lithium battery positive electrode material and a lithium ion battery. Background technique [0002] With the demand for energy in human society, green, clean and efficient energy supply has become one of the major and urgent issues facing science today. As a new type of green power supply, lithium-ion batteries have many advantages such as high specific energy, small self-discharge, high open circuit voltage, no memory effect, long cycle life, and low environmental pollution. They are widely used in mobile phones, notebook computers, etc. Digital electronic products, pure electric and hybrid new energy vehicles, and energy storage systems. In this context, lithium-ion batteries have attracted more and more scholars to conduct in-depth research on them because of their wide application prospects and huge potential econom...

AI Technical Summary

Problems solved by technology

But LiNiO 2 The structural order and stability of LiNiO are poor 2 Middle Ni 3+ Ions are more difficult to form, low-priced Ni 2+ ion easy with Li + Cationic mixing occurs, affecting its electrochemical performance

LiMnO 2 The theoretical capacity is 285mAh / g, but its thermodynamic structure is unstable, and irreversible phase transitions are prone to occur during charging and discharging, resulting in a large attenuation of capacity

[0005] Ternary material LiNi x mn y co z o 2 It has the advantages of high specific capacity, stable cycle, low production cost and simple production process. It has developed rapidly in recent years and has become a research hotspot in the field of power batteries, but there are also some defects that cannot be ignored, such as cation misalignment, material vibration, etc. Low density, low volume energy density, high cut-off voltage and poor cycle performance and thermal stability when working under high temperature conditions, side reactions with electrolyte, etc., are the key points that must be solved before the material can be used in large-scale energy storage devices. The improvement of its preparation method so that it can overcome these defects is a current research hotspot.

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