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Anion-cation co-doped quasi-single-crystal ternary cathode material and preparation method thereof

A cathode material, anion and cation technology, applied in the field of quasi-single crystal ternary cathode materials, can solve the problems of collapse of secondary spherical particle structure, prone to side reactions in electrolyte, degradation of electrochemical performance, etc., to reduce the degree of cation mixing , good electrochemical performance, the effect of reducing the contact area

Active Publication Date: 2022-07-26
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The current commercialized NCA ternary cathode materials are secondary spherical particles formed by the aggregation of primary particles, so there are some problems that need to be solved urgently: (1) The bulk density is low, resulting in low compaction density
(2) The secondary particle material formed by primary particles has a large specific surface area and is prone to side reactions with the electrolyte, resulting in a decrease in electrochemical performance
(3) During the high-voltage charging and discharging process, the secondary spherical particles are prone to structural collapse and gas production.

Method used

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  • Anion-cation co-doped quasi-single-crystal ternary cathode material and preparation method thereof
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  • Anion-cation co-doped quasi-single-crystal ternary cathode material and preparation method thereof

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Embodiment 1

[0023] (1) Preparation of precursors: The precursors of ternary cathode materials doped with Zn cations were prepared by sol-gel method. According to the molar ratio Ni:Co:Al:Zn= 0.78:0.15:0.05:0.02, the acetates of nickel, cobalt, aluminum and zinc were weighed and dissolved in the methanol / ethanol mixed solution, and the mixed solution was continuously carried out at 50°C. Stir and slowly add the complexing agent citric acid. After 12 h of reaction, the mixed solution was placed at 80°C with constant stirring until the solution completely turned into a dry gel. The obtained xerogel was dried in a vacuum drying oven at 100 °C for 24 h, and the dried powder was then calcined in a tube furnace at 750 °C for 12 h in an air atmosphere, and the obtained powder was ground and sieved. precursor.

[0024] (2) Preparation of anion-cation co-doped quasi-single-crystal ternary cathode material. Lithium hydroxide, precursor and lithium fluoride were weighed in a molar ratio of 1.03:1:...

Embodiment 2

[0027] (1) Preparation of precursors: The precursors of ternary cathode materials doped with Mg cations were prepared by sol-gel method. According to the molar ratio Ni:Co:Al:Mg=0.77:0.15:0.05:0.03, the acetate salts of nickel, cobalt, aluminum and magnesium were weighed and dissolved in the methanol / ethanol mixed solution, and the mixed solution was continuously carried out at 50°C. Stir and slowly add the complexing agent citric acid. After 12 h of reaction, the mixed solution was placed at 80°C with constant stirring until the solution completely turned into a dry gel. The obtained xerogel was dried in a vacuum drying oven at 100 °C for 24 h, and the dried powder was then calcined in a tube furnace at 750 °C for 12 h in an air atmosphere, and the obtained powder was ground and sieved. precursor.

[0028](2) Preparation of anion-cation co-doped quasi-single-crystal ternary cathode material. Weigh lithium hydroxide, precursor and lithium fluoride according to the molar rat...

Embodiment 3

[0030] (1) Preparation of precursors: The precursors of ternary cathode materials doped with Zn cations were prepared by sol-gel method. According to the molar ratio Ni:Co:Al:Zn= 0.79:0.15:0.05:0.01, the acetate salts of nickel, cobalt, aluminum and zinc were weighed and dissolved in the methanol / ethylene glycol mixed solution, and the mixed solution was kept at 50°C. stirring and slowly adding the complexing agent glycolic acid. After 12 h of reaction, the mixed solution was placed at 80°C with constant stirring until the solution completely turned into a dry gel. The obtained xerogel was dried in a vacuum drying oven at 100 °C for 24 h, and the dried powder was then calcined in a tube furnace at 750 °C for 12 h in an air atmosphere, and the obtained powder was ground and sieved. precursor.

[0031] (2) Preparation of anion-cation co-doped quasi-single-crystal ternary cathode material. Weigh lithium hydroxide, precursor and lithium chloride according to the molar ratio of ...

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Abstract

The invention discloses an anion-cation co-doped quasi-single-crystal ternary positive electrode material and a preparation method thereof, the general formula of which is LiNi 0.8‑x Co 0.15 Al 0.05 M x O 2‑y V y , where 0.01≤x≤0.03, 0.01≤y≤0.04, M is one of Zn, Mg, and Cu, and V is one of F, Br, and Cl. Firstly, the precursor of the ternary cathode material doped with cation M is prepared by the sol-gel method, and then the precursor is mixed with lithium salt (the lithium salt that provides lithium element is mixed with the lithium salt that provides V element), and then it is calcined at high temperature after ball milling. An anion-cation co-doped quasi-single-crystal ternary cathode material is obtained. The lithium ion battery ternary positive electrode material prepared by the invention has fine and uniform particles, low specific surface area, low cation mixing degree, good crystallinity, good cycle stability and first Coulomb efficiency.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, in particular to an anion-cation co-doped quasi-single-crystal ternary positive electrode material LiNi 0.8-x Co 0.15 Al 0.05 M x O 2-y V y and its preparation method. Background technique [0002] As the global energy problem intensifies, the new energy vehicle industry, as an emerging strategic industry in my country, will usher in major opportunities and challenges. As the heart of new energy vehicles, power batteries urgently need to develop electrode materials with high energy density and good stability to meet the needs of the battery vehicle industry. [0003] LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) is considered to be one of the preferred cathode materials for lithium-ion batteries for electric vehicles due to its high specific capacity and low price. Although partial replacement of Ni with Co and Al can significantly improve LiNiO 2 structure and thermal stab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525H01M4/485H01M10/0525
CPCH01M4/525H01M4/485H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 刘慧勇汪思宇何凤清谷建锋
Owner FUZHOU UNIV
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