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High-nickel cathode material rich in rock salt phase on the surface, and a preparation method and application thereof

A positive electrode material, high-nickel technology, applied in the direction of positive electrodes, battery electrodes, active material electrodes, etc., can solve the problems of comprehensive performance of ternary materials, unstable surface chemical properties of materials, poor effect of ternary materials, etc. , to achieve significant cycle performance, great theoretical and practical significance, and broad prospects for commercial application

Active Publication Date: 2019-01-25
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the above-mentioned single bulk phase doping or surface coating method is not effective for improving the comprehensive performance of ternary materials. On the one hand, bulk phase doping cannot solve the problem of unstable chemical properties of the material surface; on the other hand On the one hand, surface coating cannot solve the defects of the material structure itself.
In addition, most of the modification process is too complicated, and most of the methods are treated by wet process, which is easy to produce waste liquid and pollute the environment
[0007] So far, there has been no report on the combination of bulk doping and surface coating to improve the comprehensive performance of ternary materials

Method used

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  • High-nickel cathode material rich in rock salt phase on the surface, and a preparation method and application thereof
  • High-nickel cathode material rich in rock salt phase on the surface, and a preparation method and application thereof
  • High-nickel cathode material rich in rock salt phase on the surface, and a preparation method and application thereof

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Embodiment 1

[0044] Embodiment 1 of the present invention provides a method for preparing a high-nickel ternary positive electrode material for a lithium-ion battery doped with transition metal ions in a high-valence state and whose surface is rich in rock-salt phase. The specific steps are as follows:

[0045] (1) Take 300g Ni 0.88 co 0.09 Al 0.03 (OH) 2 precursor with 3.16g MnO 2 The particles are mixed evenly (weighed according to 1% coating amount), and then mixed at a high speed in a mechanical fusion machine with a line speed of 13m / s and a mixing time of 5min to obtain a uniform surface coating of MnO 2 Ni 0.88 co 0.09 Al 0.03 (OH) 2 Precursor, evenly coated with MnO 2 Ni 0.88 co 0.09 Al 0.03 (OH) 2 The scanning electron microscope pictures of the precursors are shown in figure 1 ;

[0046] (2) Molar ratio Li: (Ni+Co+Al)=1.03:1 ratio lithium hydroxide and step (1) are coated with MnO 2 Ni 0.88 co 0.09 Al 0.03 (OH) 2 Precursors are mixed and calcined in an oxygen a...

Embodiment 2

[0052] Embodiment 2 of the present invention provides a method for preparing a high-nickel ternary positive electrode material for a lithium-ion battery doped with transition metal ions in a high-valence state and whose surface is rich in rock-salt phase. The specific steps are as follows:

[0053] (1) Take 300g Ni 0.88 co 0.09 Al 0.03 (OH) 2 precursor with 6.32g MnO 2 The particles are mixed evenly (weighed according to the coating amount of 2%), and then mixed at a high speed in a mechanical fusion machine with a line speed of 13m / s and a mixing time of 5min to obtain a uniform surface coating of MnO 2 Ni 0.88 co 0.09 Al 0.03 (OH) 2 Precursor, evenly coated with MnO 2 Ni 0.88 co 0.09 Al 0.03 (OH) 2 The scanning electron microscope pictures of the precursors are shown in Figure 4 ;

[0054] (2) By molar ratio Li: (Ni+Co+Al)=1.03:1 lithium hydroxide and step (1) are coated with MnO 2 Ni 0.88 co 0.09 Al 0.03 (OH) 2 Precursors are mixed and calcined in an oxy...

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Abstract

The invention discloses a high-nickel cathode material rich in rock salt phase on the surface and a preparation method and application thereof. The high-nickel cathode material comprises LiNi1 doped with high-valence transition metal M; X-YCoxNyO2 matrix and NiO-type rock salt layer coated on the surface of matrix, high valence transition metal M is +4 +6 valence transition metal, the thickness ofNiO-type rock salt layer is 4-50nm; The preparation method comprises: mixing a Ni1-x-yCoxNy(OH)2 precursor, a nano-scale high-valence transition metal M compound and a lithium compound, and calciningat a high temperature in an oxidizing atmosphere. In the high-nickel cathode material provided by the invention, the bulk phase doping forms a strong M. O bond, which helps to improve the structuralstability; The rock salt phase on the surface of the material can inhibit the corrosion of the electrolyte, slow down the phase transformation rate in the cycle process, and inhibit the increase of the surface impedance of the material. The synergistic effect of the two phases can significantly improve the cycle performance in the application of the positive electrode of the battery.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for power batteries, in particular to a high-nickel positive electrode material with a rock-salt phase-rich surface and a preparation method and application thereof. Background technique [0002] With the continuous improvement of the energy density requirements of power batteries, the development of lithium-ion batteries with high capacity has become a top priority. Using ternary materials containing three metal elements, nickel-cobalt-manganese or nickel-cobalt-aluminum, as the positive electrode material of lithium-ion batteries can make Lithium-ion batteries have good electrochemical performance; however, as the content of nickel in the ternary material increases, the energy density of lithium-ion batteries increases more significantly, but its capacity retention rate decreases more. Therefore, in ensuring a certain energy On the basis of density, it is particularly import...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 庄卫东李文进李宁高敏卢世刚
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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