High-nickel ternary positive electrode material and preparation method thereof

A positive electrode material and high-nickel technology, applied in the field of materials, can solve the problems of poor material uniformity, uneven lithium mixing, cycle performance, rate performance, storage performance and high temperature performance, and achieve splash prevention, excellent uniformity and crystallinity high effect

Inactive Publication Date: 2021-04-20
DALIAN RONGKE ENERGY STORAGE GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to propose a method for preparing a high-nickel ternary positive electrode material in view of the problems of uneven lithium mixed, poor material uniformity, poor cycle performance, rate performance, storage performance and high temperature performance in current positive electrode materials, The high-nickel ternary cathode material prepared by this method can maintain the original (such as spherical) morphology of the high-nickel ternary precursor, and greatly improve the uniformity, cycle stability and rate performance of the high-nickel ternary cathode material

Method used

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  • High-nickel ternary positive electrode material and preparation method thereof
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  • High-nickel ternary positive electrode material and preparation method thereof

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Embodiment 1

[0037] This embodiment discloses a high-nickel ternary positive electrode material and a preparation method thereof, comprising the following steps:

[0038] Step 1. Take a certain amount of NCM622 precursor in the roasting furnace with stirring function, set the stirring speed to 120 rpm, and the heating program is: increase from room temperature to 280 °C at a heating rate of 3 °C / min, and keep the temperature at this temperature. 3h, after the program is finished, cool down to room temperature with the furnace;

[0039] Step 2, according to the molar ratio n (Li) / n (Ni+Co+Mn) =1.10 Weigh the lithium source and NCM622 oxide respectively, and place them in a roasting furnace with stirring function after premixing;

[0040] Step 3. Set the stirring speed to 300 rpm, and the heating program is: the first stage: raise the temperature from room temperature to 500 °C at a heating rate of 4 °C / min, keep at this temperature for 5 hours, and the second stage: increase the temperat...

Embodiment 2

[0043] This embodiment discloses a high-nickel ternary positive electrode material and a preparation method thereof, comprising the following steps:

[0044] Step 1. Take a certain amount of NCM622 precursor in a roasting furnace with stirring function, set the stirring speed to 150rpm, and the heating program is: increase the temperature from room temperature to 300°C at a heating rate of 3°C / min, and keep warm at this temperature 3h, after the end of the program, cool down to room temperature with the furnace;

[0045] Step 2, according to the molar ratio n (Li) / n (Ni+Co+Mn) =1.20 Take by weighing lithium source and NCM622 oxide respectively, place in the calciner with stirring function after premixing;

[0046] Step 3. Set the stirring speed to 250rpm, and the heating program is as follows: the first section: raise the temperature from room temperature to 500°C at a heating rate of 4°C / min, and keep at this temperature for 5 hours; Min heating rate, raised to 800 ° C, k...

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Abstract

The invention provides a high-nickel ternary positive electrode material and a preparation method thereof. The preparation method of the high-nickel ternary positive electrode material comprises the following steps of placing a high-nickel ternary precursor in a roasting furnace or a rotary kiln with a stirring function, carrying out low-temperature dehydration presintering while stirring is performed, and acquiring high-nickel ternary oxide; weighing a lithium source and a high-nickel ternary oxide according to a molar ratio of n (Li) / n (Ni+Co+Mn) of 1.03-1.20 respectively, and premixing to obtain a mixture; putting the mixture into the roasting furnace with the stirring function, and carrying out two-stage roasting while stirring; and washing, drying and secondarily sintering the roasted material to obtain the high-nickel ternary positive electrode material. According to the method, the original morphology of the high-nickel ternary precursor can be maintained, and the uniformity, the cycling stability and the rate capability of the high-nickel ternary positive electrode material are greatly improved.

Description

technical field [0001] The invention relates to material technology, in particular to a high-nickel ternary positive electrode material and a preparation method thereof. Background technique [0002] As a new generation of rechargeable high-energy batteries, lithium-ion secondary batteries have the advantages of high energy, good safety performance, long service life, low pollution, no memory effect and low self-discharge, and are widely used in mobile phones, digital cameras, notebook computers, etc. , instrumentation, electric vehicles and many other fields. [0003] High-nickel ternary cathode material refers to a ternary cathode material with a mole fraction of nickel greater than or equal to 0.6. It combines the characteristics of good cycle performance of lithium cobaltate, high specific capacity of lithium nickelate, and reliable safety performance of lithium manganate. And its comprehensive performance is better than any single combination compound, there is obvious...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 孟昭扬李宗麟魏晶曹永强刘阳荣明
Owner DALIAN RONGKE ENERGY STORAGE GRP CO LTD
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