Single crystal type IV-VI-VIII group lithium-rich disordered rock salt structure positive electrode material and preparation method thereof

A technology of IV-VI-VIII, positive electrode materials, applied in the field of lithium-ion battery positive electrode materials, can solve the problems of few researches on positive electrode materials, few reports, etc.

Pending Publication Date: 2021-04-20
北京理工大学重庆创新中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, single crystallization of positive electrode materials is mainly used in positive electrode materials such as ternary nickel cobalt lithium

Method used

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  • Single crystal type IV-VI-VIII group lithium-rich disordered rock salt structure positive electrode material and preparation method thereof
  • Single crystal type IV-VI-VIII group lithium-rich disordered rock salt structure positive electrode material and preparation method thereof
  • Single crystal type IV-VI-VIII group lithium-rich disordered rock salt structure positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A single crystal Li 1.2 Ti 0.33 W 0.13 Ni 0.33 o 2 A method for preparing a positive electrode material, comprising the following steps:

[0043] S1. Weigh lithium acetate, tetrabutyl titanate, tungsten ethoxide and nickel acetate according to the stoichiometric ratio, and dissolve the metal salt in a mixed alcohol solution with an absolute ethanol / ethylene glycol volume ratio of 8:1 to obtain a mixed metal Alcoholic solution;

[0044] S2. Dissolving citric acid in a mixed alcohol solution with an absolute ethanol / ethylene glycol volume ratio of 8:1 to obtain a complexing agent solution, and adding the complexing agent solution dropwise to the configured mixed metal alcohol solution, wherein The ratio of the moles of citric acid to the sum of the moles of all metal ions in the metal salt solution is 1.2:1;

[0045] S3. Evaporate at 80°C for 5h under the condition of maintaining rapid stirring to form a green gel, and place it in a vacuum drying oven at 80°C for 24...

Embodiment 2

[0050] A single crystal Li 1.2 Ti 0.33 W 0.13 Ni 0.33 o 2 A method for preparing a positive electrode material, comprising the following steps:

[0051] S1. Weigh lithium acetate, tetrabutyl titanate, tungsten ethoxide and nickel acetate according to the stoichiometric ratio, and dissolve the metal salt in a mixed alcohol solution with a volume ratio of absolute ethanol / isopropanol of 7:1 to obtain a mixed metal Alcoholic solution;

[0052] S2. Dissolving citric acid in a mixed alcohol solution with an absolute ethanol / isopropanol volume ratio of 7:1 to obtain a complexing agent solution, and adding the complexing agent solution dropwise to the configured mixed metal alcohol solution, wherein The ratio of the moles of citric acid to the sum of the moles of all metal ions in the metal salt solution is 1.2:1;

[0053] S3. Evaporate at 80°C for 5h under the condition of maintaining rapid stirring to form a green gel, and place it in a vacuum drying oven at 80°C for 24h to o...

Embodiment 3

[0058] A single crystal Li 1.2 Ti 0.21 W 0.21 Ni 0.33 o 2 A method for preparing a positive electrode material, comprising the following steps:

[0059] S1. Weigh lithium acetate, tetrabutyl titanate, tungsten ethoxide and nickel acetate according to the stoichiometric ratio, and dissolve the metal salt in a mixed alcohol solution with an absolute ethanol / ethylene glycol volume ratio of 8:1 to obtain a mixed metal Alcoholic solution;

[0060] S2. Dissolving citric acid in a mixed alcohol solution with an absolute ethanol / ethylene glycol volume ratio of 8:1 to obtain a complexing agent solution, and adding the complexing agent solution dropwise to the configured mixed metal alcohol solution, wherein The ratio of the moles of citric acid to the sum of the moles of all metal ions in the metal salt solution is 1.2:1;

[0061] S3. Evaporate at 80°C for 5h under the condition of maintaining rapid stirring to form a green gel, and place it in a vacuum drying oven at 80°C for 24...

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Abstract

The invention discloses a single crystal type IV-VI-VIII group lithium-rich disordered rock salt structure positive electrode material and a preparation method thereof. The general formula of the positive electrode material is Li<1+a>TiW<c>Ni<d>O<2>, wherein a is greater than 0.1 and smaller than 0.3, b is greater than 0.1 and smaller than 0.4, c is greater than 0.1 and smaller than 0.4, d is greater than 0.1 and smaller than 0.4 , and the sum of a+4b+6c+2d is equal to 3. The single crystal type material is composed of IV group elements, VI group elements and VIII group elements, is specifically composed of titanium of the IV group elements, tungsten of the VI group elements and nickel of the VIII group elements, and has a more stable three-dimensional disordered cation skeleton structure, a more complete crystal structure, higher compaction density and a smaller specific surface area compared with a traditional ternary lithium nickel cobalt manganate positive electrode material; and therefore, the material has good rate capability and cycle performance, and can be used in lithium ion batteries.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a single crystal type IV-VI-VIII group lithium-rich disordered rock salt structure positive electrode material and a preparation method thereof. Background technique [0002] In the 21st century, the energy crisis and environmental pollution have gradually become unavoidable topics that hinder the high-quality development of the world, and the development of new environmentally friendly energy has thus become a major issue that determines the future destiny of mankind. The main way to utilize new energy is to convert it into electrical energy, so energy storage and conversion are key issues. As an efficient energy storage device, lithium-ion batteries have attracted widespread attention from all over the world. In the lithium-ion battery system, the battery capacity is mainly limited by the capacity of the positive electrode material, and the...

Claims

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Application Information

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IPC IPC(8): C30B29/22C30B1/10C01G53/00H01M4/485H01M4/525H01M4/58H01M10/0525
CPCY02E60/10
Inventor 董锦洋苏岳锋陈来李宁包丽颖卢赟赵佳雨陈实吴锋
Owner 北京理工大学重庆创新中心
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