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Preparation method and application of single-crystal high-nickel ternary material with completely modified surface

A high-nickel ternary material and single crystal technology, applied in chemical instruments and methods, electrical components, nickel compounds, etc., can solve the problems of diffusion path damage, low Coulombic efficiency, active material exposure, etc., to improve cycle performance and The effect of high rate performance, simple and reliable process method, and simple process flow

Pending Publication Date: 2022-04-01
GUANGXI NORMAL UNIV
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Problems solved by technology

However, the existence of grain boundaries in primary particles restricts the Li + transport kinetics, which makes it difficult for high-nickel ternary cathode materials to take full advantage of their high volumetric energy density
In addition, a series of phase transitions occur during charge and discharge, leading to severe lattice distortion and the formation of microcracks
Microcracks, as the main factor of capacity fading, will lead to major changes in interface chemistry, for example, the formation of microcracks may lead to the destruction of the initially formed solid electrolyte interfacial film, leading to more exposure of active materials, thereby further accelerating interfacial side reactions, In addition, Li-ion diffusion resistance will increase due to the impaired diffusion path
The single crystal high-nickel ternary cathode material with submicron particle size can well avoid the problem of polycrystalline particles. Due to its uniform stress distribution and good structural stability, single crystal particles can effectively reduce the formation of microcracks and maintain Structural integrity, unfortunately, the high specific surface area of ​​single crystal materials makes side reactions at the electrode / electrolyte interface severe, leading to low Coulombic efficiency and dissolution of transition metals into organic electrolytes
[0004] Surface modification is a widely used method to improve the stability of high-nickel ternary cathode materials, although the surface modification layer with high stability and catalytic inertness is helpful, but due to the problem of solid-to-solid wetting and during electrochemical cycling Needs to maintain shape in composites, often difficult to achieve 100% coverage in compositing
Atomic layer deposition (ALD) is currently known as a method for uniform and 100% modification of the surface of high-nickel ternary cathode materials, but ALD requires high-end technical equipment, special raw materials, high cost, and cannot achieve industrial production

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  • Preparation method and application of single-crystal high-nickel ternary material with completely modified surface
  • Preparation method and application of single-crystal high-nickel ternary material with completely modified surface
  • Preparation method and application of single-crystal high-nickel ternary material with completely modified surface

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Embodiment 1

[0028] a MgB 2 The preparation method of the single crystal high-nickel ternary material with completely modified surface comprises the following steps:

[0029] 1) Weigh 200 g of Ni 0.8 co 0.1 mn 0.1 (OH) 2 , then weigh lithium hydroxide according to the lithium source: the molar ratio of the ternary precursor is 1.05, then put it into the mixer and mix it evenly, and place the evenly mixed mixture in the pre-oxygenated atmosphere furnace, set the calcining program, first at 480 °C for 5 h, then at 750 °C for 15 h, with a heating rate of 5 °C / min;

[0030] 2) The high-nickel ternary material obtained in step 1) is crushed, and then passed through a 400-mesh sieve to obtain a single-crystal high-nickel ternary material with uniform particle size dispersion;

[0031] 3) Weigh 100 g of the single crystal high-nickel ternary material obtained in step 2), add it to a 5 L vacuum stirred reactor, add 2 L, 0.009 M Mg(NO 3 ) 2 in anhydrous ethanol solution, slowly stirred for 1...

Embodiment 2

[0034] A kind of Co 2 The preparation method of the fully modified single crystal high-nickel ternary material of B surface comprises the steps:

[0035] 1) Weigh 200 g of Ni 0.8 co 0.1 mn 0.1 (OH) 2 , then weigh lithium hydroxide according to the lithium source: the molar ratio of the ternary precursor is 1.05, then put it into the mixer and mix it evenly, and place the evenly mixed mixture in the pre-oxygenated atmosphere furnace, set the calcining program, first at 480 °C for 5 h, then at 750 °C for 15 h, with a heating rate of 5 °C / min;

[0036] 2) The high-nickel ternary material obtained in step 1) is crushed, and then passed through a 400-mesh sieve to obtain a single-crystal high-nickel ternary material with uniform particle size dispersion;

[0037] 3) Weigh 100 g of the single crystal high-nickel ternary material obtained in step 2), add it to a 5 L vacuum stirred reactor, add 2 L, 0.009 M Mg(NO 3 ) 2 in anhydrous ethanol solution, slowly stirred for 1 h, pass...

Embodiment 3

[0040] A method for preparing a single crystal high-nickel ternary material with a fully modified FeB surface, comprising the following steps

[0041] 1) Weigh 200 g of Ni 0.8 co 0.1 mn 0.1 (OH) 2 , then weigh lithium hydroxide according to the lithium source: the molar ratio of the ternary precursor is 1.05, then put it into the mixer and mix it evenly, and place the evenly mixed mixture in the pre-oxygenated atmosphere furnace, set the calcining program, first at 480 °C for 5 h, then at 750 °C for 15 h, with a heating rate of 5 °C / min;

[0042] 2) The high-nickel ternary material obtained in step 1) is crushed, and then passed through a 400-mesh sieve to obtain a single-crystal high-nickel ternary material with uniform particle size dispersion;

[0043] 3) Weigh 100 g of the single crystal high-nickel ternary material obtained in step 2), add it to a 5 L vacuum stirred reactor, add 2 L, 0.009 M Fe(NO 3 ) 2 in anhydrous ethanol solution, slowly stirred for 1 h, passed i...

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Abstract

The invention discloses a preparation method and application of a surface-completely-modified single-crystal high-nickel ternary material, and the method comprises the following steps: synthesizing a single-crystal high-nickel ternary material by adopting a high-temperature solid-phase method, and then realizing MxBy complete modification on the surface of the single-crystal high-nickel ternary positive electrode material by adopting an oxidation-reduction reaction and a complexation reaction. The method is simple and reliable in process and low in cost, the cycle performance of the material can be improved, the internal resistance of the material can be improved, and the prepared single-crystal high-nickel ternary material is good in electrochemical performance and suitable for industrial production and has good development prospects in the field of power batteries, especially in application of battery positive electrode materials.

Description

technical field [0001] The invention relates to new energy material technology, in particular to a preparation method and application of a completely surface-modified single-crystal high-nickel ternary material. Background technique [0002] With the development of new energy technologies, advanced cathode materials with excellent discharge capacity and good stability are urgently needed to meet the increasing demand for high energy density lithium-ion batteries (LIBs). Among them, the high-nickel ternary cathode material is considered as an ideal cathode material because of its high specific capacity, better electrochemical performance and environmental friendliness. [0003] At present, the most researched and widely used high-nickel ternary cathode materials are secondary spherical polycrystalline particles formed by agglomeration of small grain crystals. However, the existence of grain boundaries in primary particles restricts the Li + Transport kinetics, which makes i...

Claims

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Application Information

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IPC IPC(8): C01G53/00C01B35/04H01M4/505H01M4/525H01M4/36
CPCY02E60/10
Inventor 王红强杨广场杨生龙彭凡张晓辉赖飞燕李庆余
Owner GUANGXI NORMAL UNIV
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