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Cobalt-free positive electrode material and preparation method and application thereof

A positive electrode material, diffraction method technology, applied in positive electrodes, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of cumbersome preparation process, serious gas production, etc., to increase the rate of charge and discharge, reduce gas production, increase capacity and The effect of cycle performance

Active Publication Date: 2022-05-03
SVOLT ENERGY TECH (MAANSHAN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this solution has the problems of cumbersome preparation process and serious gas production.

Method used

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  • Cobalt-free positive electrode material and preparation method and application thereof
  • Cobalt-free positive electrode material and preparation method and application thereof
  • Cobalt-free positive electrode material and preparation method and application thereof

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preparation example Construction

[0040] In a specific embodiment, the present invention provides a method for preparing a cobalt-free positive electrode material, the preparation method comprising the following steps:

[0041] (1) Lithium source (LiCO 3 and / or LiOH), precursor Ni x mn 1-x (OH) 2 (0.2≤x≤0.95) and the dopant are mixed evenly with a high-speed mixer, put into a box-type atmosphere furnace for a sintering, the sintering temperature is 750-1000°C, crushed after the sintering is completed, and airflow crushed after the crushing is completed The machine is crushed, and after the crushing is completed, the first-fired material is obtained;

[0042] The dopant can be ZrO 2 、TiO 2 , TeO, TeO 2 , SbO 2 , Sb 2 o 3 , Y 2 o 3 、 Bi 2 o 3 or Ta 2 o 5 at least one of;

[0043] (2) Mix the primary sintered product with a coating agent, and perform secondary sintering at 600-800°C to obtain a cobalt-free positive electrode material;

[0044] Wherein, the coating agent can be Al 2 o 3 , ZrO 2...

Embodiment 1

[0046] This embodiment provides a cobalt-free positive electrode material (specific surface area is 0.85m 2 / g, the D50 of the primary particles is 2.3 μm), the chemical formula of the cobalt-free cathode material is Li 1.1 Ni 0.55 mn 0.45 o 2 , C S =C 003 / C 104 , C 003 is the peak area of ​​the 003 characteristic diffraction peak in the X-ray diffraction pattern of the cobalt-free cathode material, C 104 is the peak area of ​​the 104 characteristic diffraction peak in the X-ray diffraction pattern of the cobalt-free positive electrode material; CD is the maximum compaction density that the particles in the cobalt-free positive electrode material do not break to reach, wherein, C S 、C 003 、C 104 , CD, C S The numerical results of ×CD are shown in Table 1.

[0047] The preparation method of the cobalt-free positive electrode material is based on the preparation method provided in the above specific embodiment:

[0048] Wherein, wherein, the precursor is Ni 0.55 mn...

Embodiment 2

[0051] This embodiment provides a cobalt-free positive electrode material (specific surface area is 1m 2 / g, the D50 of the primary particles is 2 μm), the chemical formula of the cobalt-free cathode material is Li 1.1 Ni 0.55 mn 0.45 o 2 , C S =C 003 / C 104 , C 003 is the peak area of ​​the 003 characteristic diffraction peak in the X-ray diffraction pattern of the cobalt-free cathode material, C 104 is the peak area of ​​the 104 characteristic diffraction peak in the X-ray diffraction pattern of the cobalt-free positive electrode material; CD is the maximum compaction density that the particles in the cobalt-free positive electrode material do not break to reach, wherein, C S 、C 003 、C 104 , CD, C S The numerical results of ×CD are shown in Table 1.

[0052] The preparation method of the cobalt-free positive electrode material is based on the preparation method provided in the above specific embodiment:

[0053] Wherein, wherein, the precursor is Ni 0.55 mn 0.4...

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Abstract

The invention provides a cobalt-free positive electrode material and a preparation method and application thereof. The chemical general formula of the cobalt-free positive electrode material is LiaNixMnyO2, a is more than 1 and less than 1.2, x is more than 0.5 and less than 1, y is more than 0 and less than 0.5, and x + y is equal to 1; in the cobalt-free positive electrode material, CS is equal to C003 / C104, 0.9 < CS < 1, C003 is the peak area of a 003 characteristic diffraction peak in an X-ray diffraction pattern of the cobalt-free positive electrode material, and C104 is the peak area of a 104 characteristic diffraction peak in the X-ray diffraction pattern of the cobalt-free positive electrode material. By regulating the peak area ratio of the 003 characteristic diffraction peak to the 104 characteristic diffraction peak of the cobalt-free positive electrode material in the X-ray diffraction pattern, the infiltration of the cobalt-free positive electrode material in the electrolyte is effectively regulated, the gas production in the charge-discharge cycle process is reduced, the surface impedance and rate charge-discharge of the material are improved, and the performance of the material is improved. And finally, the structural stability and the cycle life of the material are improved.

Description

technical field [0001] The invention belongs to the technical field of cobalt-free materials, and relates to a cobalt-free cathode material and a preparation method and application thereof. Background technique [0002] Due to the advantages of high voltage, high energy density, long cycle life, no memory effect, and no pollution to the environment, lithium-ion batteries have become one of the most widely used secondary batteries. However, with the miniaturization of portable electronic devices and the continuous development of long standby time, as well as the use of high-power and high-energy devices such as electric bicycles and electric vehicles, the energy density of lithium-ion batteries as energy storage power sources has been increasingly raised. high demands. In particular, electric vehicles need to achieve high safety, long life, and fast charging capabilities. However, during the battery cycle, flatulence, increased internal resistance, and serious life-span degr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525C01G53/00
CPCH01M4/362H01M4/505H01M4/525H01M10/0525C01G53/44H01M2004/028C01P2002/72C01P2006/40C01P2004/82Y02E60/10
Inventor 潘海龙李子郯杨红新
Owner SVOLT ENERGY TECH (MAANSHAN) CO LTD
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