Preparation method of modified high-nickel ternary positive electrode material

A positive electrode material, high-nickel technology, applied in the field of preparation of modified high-nickel ternary positive electrode materials, can solve the problem of incomplete matching of coating temperature and sintering temperature, uneven distribution of nickel-manganese oxide precursors, and reduction of lithium ion deintercalation Kinetic properties and other issues, to achieve the effect of accelerating the rapid deintercalation process, good structural reversibility, and improving rate discharge performance

Inactive Publication Date: 2021-10-08
CENT SOUTH UNIV +1
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  • Abstract
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Problems solved by technology

However, this method is synthesized by a solid-state method, and the synthesized nickel-manganese oxide precursor is unevenly distributed, the particle size is different, and there is no obvious regular shape, which has a serious impact on the electrochemical performance of the later-synthesized positive electrode material.
And this method is to sinter the precursor with lithium and vanadium source at high temperature at the same time. However, the coating temperature of vanadium oxide and the sintering temperature of precursor with lithium cannot completely match, and the structure of the matrix material may be destroyed under the same sintering system. This sintering step is prone to deep diffusion of the material and cannot achieve uniform coating of the surface layer
In addition, this method uses PFG as a dispersant. During the high-temperature sintering process, PEG will form gas and discharge, which may form holes in the coating layer, making the formed c

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  • Preparation method of modified high-nickel ternary positive electrode material
  • Preparation method of modified high-nickel ternary positive electrode material
  • Preparation method of modified high-nickel ternary positive electrode material

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Embodiment 1

[0047] A modified high-nickel ternary positive electrode material of the present invention, comprising high-nickel ternary positive electrode material LiNi 0.74 co 0.14 mn 0.12 o 2 The matrix, the high-nickel ternary positive electrode material is doped with metal magnesium, and the surface of the magnesium-doped high-nickel ternary positive electrode material is covered with a layer of lithium vanadate coating layer, and the magnesium doping content accounts for 2% of the total transition metals. The lithium vanadate coating layer accounts for 3% of the magnesium-doped high-nickel ternary cathode material; the modified high-nickel ternary cathode material is a spherical secondary particle aggregate with an average particle size of 9 μm, regular shape, and distribution Uniform; the average thickness of the lithium vanadate coating layer is 5nm.

[0048] The preparation method of the modified high-nickel ternary positive electrode material of the present embodiment, the step...

Embodiment 2

[0080] A modified high-nickel ternary positive electrode material of the present invention, comprising high-nickel ternary positive electrode material LiNi 0.74 co 0.14 mn 0.12 o 2 The matrix, the high-nickel ternary positive electrode material is doped with metal magnesium, and the surface of the magnesium-doped high-nickel ternary positive electrode material is covered with a layer of lithium vanadate coating layer, and the magnesium doping content accounts for 3% of the total transition metal. The lithium vanadate coating layer accounts for 5% of the magnesium-doped ternary material; the modified high-nickel ternary material is a spherical secondary particle agglomerate with an average particle size of 9 μm, regular shape and uniform distribution; vanadium The average thickness of the lithium oxide coating layer is 6nm.

[0081] The preparation method of the modified high-nickel ternary positive electrode material of the present embodiment, the steps are as follows:

[...

Embodiment 3

[0089] A modified high-nickel ternary cathode material of the present invention, comprising magnesium-doped high-nickel ternary cathode material LiNi 0.74 co 0.14 mn0.12 o 2 Substrate, magnesium-doped high-nickel ternary positive electrode material The surface of the substrate is covered with a layer of lithium vanadate coating layer, the magnesium doping content accounts for 2% of the total transition metal, and the lithium vanadate coating layer accounts for 2% of the magnesium-doped ternary material. The modified high-nickel ternary cathode material is a spherical secondary particle aggregate with an average particle size of 9 μm, regular shape and uniform distribution; the average thickness of the lithium vanadate coating layer is 5nm.

[0090] The preparation method of the modified high-nickel ternary positive electrode material of the present embodiment, the steps are as follows:

[0091] (1) The preparation process of the nickel-cobalt-manganese hydroxide precursor is...

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Abstract

The invention discloses a preparation method of a modified high-nickel ternary positive electrode material, which comprises the steps of uniformly mixing a nickel-cobalt-manganese hydroxide precursor with a lithium source and a magnesium source, and carrying out two-stage sintering to obtain a magnesium-doped ternary high-nickel positive electrode material; and dispersing the magnesium-doped ternary high-nickel positive electrode material in an organic solvent, then adding a vanadium source and a lithium source, uniformly stirring, heating, evaporating to dryness, drying, and sintering at high temperature to obtain the lithium vanadate-coated magnesium-doped high-nickel ternary positive electrode material. According to the modified high-nickel ternary positive electrode material disclosed by the invention, the cycle performance and the rate capability of the material can be synergistically improved due to the high-nickel ternary positive electrode material is subjected to double modification treatment of magnesium ion doping and fast ion conductor coating.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a preparation method of a modified high-nickel ternary positive electrode material. Background technique [0002] High nickel ternary cathode material Li(Ni x co y mn 1-x-y )O 2 (NCM) has the advantages of high specific capacity, good rate performance, and relatively low cost, and is considered to be one of the most promising cathode materials for power lithium-ion batteries. However, high-nickel ternary cathode materials have problems such as high surface activity, poor cycle performance, and unstable structure. Element doping and surface modification can improve the stability of high-nickel ternary cathode materials to a certain extent, and further improve Electrochemical properties of materials. [0003] Patent document CN103794753A discloses a lithium-ion battery composite cathode material and its preparation method. The method is to coat a layer of unifo...

Claims

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Application Information

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IPC IPC(8): C01G53/00C01G31/00H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCC01G53/44C01G31/00H01M4/366H01M4/525H01M4/505H01M4/628H01M4/624H01M10/0525H01M2004/021H01M2004/028C01P2004/32C01P2004/61C01P2004/86C01P2002/72C01P2004/03C01P2004/04C01P2006/40Y02E60/10
Inventor 童汇毛高强郭学益喻万景田庆华丁治英訚硕王一乔李魁姚渝姚赢赢
Owner CENT SOUTH UNIV
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