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Negative and positive ion co-doped monocrystal-like ternary positive electrode material and preparation method thereof

A cathode material, anion and cation technology, applied in the field of single-crystal ternary cathode materials, can solve the problems of low packing density, collapse of secondary spherical particle structure, and degradation of electrochemical performance, so as to achieve uniform distribution of elements and reduce cation mixing degree, the effect of improving cycle stability

Active Publication Date: 2019-09-27
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Negative and positive ion co-doped monocrystal-like ternary positive electrode material and preparation method thereof
  • Negative and positive ion co-doped monocrystal-like ternary positive electrode material and preparation method thereof
  • Negative and positive ion co-doped monocrystal-like ternary positive electrode material and preparation method thereof

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Effect test

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, weigh the acetate of nickel, cobalt, aluminum, and zinc and dissolve it in the methanol / ethanol mixed solution, and the mixed solution is continuously carried out at 50°C. Stir and slowly add complexing agent citric acid. After reacting for 12 hours, the mixed solution was placed at 80° C. and stirred continuously until the solution completely turned into a xerogel. Dry the obtained xerogel in a vacuum oven at 100°C for 24 hours, then place the dried powder in a tube furnace at 750°C for 12 hours in an air atmosphere, and then grind and sieve the obtained powder to prepare it precursors.

[0024] (2) Preparation of single-crystal-like ternary cathode materials co-doped with anions and cations. Weigh lithium hydroxide, precursor, and lithium fluoride according to the molar ratio ...

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, weigh the acetate of nickel, cobalt, aluminum, magnesium and dissolve it in the methanol / ethanol mixed solution, and the mixed solution is continuously carried out at 50°C Stir and slowly add complexing agent citric acid. After reacting for 12 hours, the mixed solution was placed at 80° C. and stirred continuously until the solution completely turned into a xerogel. Dry the obtained xerogel in a vacuum oven at 100°C for 24 hours, then place the dried powder in a tube furnace at 750°C for 12 hours in an air atmosphere, and then grind and sieve the obtained powder to prepare it precursors.

[0028] (2) Preparation of single-crystal-like ternary cathode materials co-doped with anions and cations. Weigh lithium hydroxide, precursor, and lithium fluoride according to the molar ratio...

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, weigh the acetate of nickel, cobalt, aluminum, and zinc and dissolve it in the methanol / ethylene glycol mixed solution, and keep the mixed solution at 50°C. Stir and slowly add complexing agent glycolic acid. After reacting for 12 hours, the mixed solution was placed at 80° C. and stirred continuously until the solution completely turned into a xerogel. Dry the obtained xerogel in a vacuum oven at 100°C for 24 hours, then place the dried powder in a tube furnace at 750°C for 12 hours in an air atmosphere, and then grind and sieve the obtained powder to prepare it precursors.

[0031] (2) Preparation of single-crystal-like ternary cathode materials co-doped with anions and cations. Weigh lithium hydroxide, precursor, and lithium chloride according to the molar ratio of 1.04:1:0.0...

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Abstract

The invention discloses a negative and positive ion co-doped monocrystal-like ternary positive electrode material and a preparation method thereof. The general formula of the negative and positive ion co-doped monocrystal-like ternary positive electrode material is LiNi<0.8-x>Co0.15Al0.05MxO<2-y>Vy, wherein 0.01<=x<=0.03, 0.01<=y<=0.04, M is one of Zn, Mg and Cu elements, and V is one of F, Br and Cl elements. The preparation method comprises the following steps: firstly, preparing a precursor of a cationic M-doped ternary positive electrode material by adopting a sol-gel method, then carrying out the ball-milling and uniform mixing of the precursor with lithium salt (lithium salt for providing lithium element), and carrying out high-temperature roasting to obtain the negative and positive ion co-doped monocrystal-like ternary positive electrode material. The ternary positive electrode material of the lithium ion battery prepared by the invention has the advantages of fine and uniform particles, low specific surface area, low cationic mixing degree, good crystallinity, good cycling stability and good initial coulombic efficiency.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to an anion-cation co-doped similar 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] With the intensification of global energy problems, the new energy automobile 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 as 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 the LiNiO ...

Claims

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Application Information

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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 UNIVERSITY
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