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Lithium vanadyl phosphate modified lithium-rich manganese-based layered lithium-ion battery cathode material and preparation method thereof

A lithium-ion battery, lithium vanadyl phosphate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor long-cycle stability, poor high-rate performance, low initial efficiency, etc., to improve the rate performance, improve Platform attenuation, high energy density effect

Inactive Publication Date: 2020-02-07
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there are still many problems to be solved for this material: low initial efficiency, poor high-rate performance caused by low electronic conductance, poor long-term cycle stability, platform attenuation, etc.

Method used

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  • Lithium vanadyl phosphate modified lithium-rich manganese-based layered lithium-ion battery cathode material and preparation method thereof
  • Lithium vanadyl phosphate modified lithium-rich manganese-based layered lithium-ion battery cathode material and preparation method thereof
  • Lithium vanadyl phosphate modified lithium-rich manganese-based layered lithium-ion battery cathode material and preparation method thereof

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Embodiment 1

[0059] A preparation method of lithium vanadyl phosphate lithium modified lithium-rich manganese-based layered lithium-ion battery cathode material of the present invention comprises the following steps:

[0060] (1) Dissolve 0.03997 mol of manganese acetate, 0.02997 mol of cobalt acetate, and 0.02997 mol of nickel acetate in 100 mL of deionized water in sequence, then add 0.09 mol of citric acid and 0.11 mol of lithium nitrate, then adjust the pH value to 9 with ammonia water, and set the temperature at 80°C Under the condition of water bath, stir for 3 hours to form a precursor sol, keep warm at 100°C for 24 hours in the air, and calcined in a muffle furnace. Battery cathode material in powder form.

[0061] (2) Dissolve 0.000135mol of oxalic acid in 100mL of deionized water, add 0.000045mol of vanadium pentoxide, stir for 2 hours in a water bath at 70°C, add 0.00009mol of lithium nitrate, and finally 0.00009mol of ammonium dihydrogen phosphate Add, react to obtain lithium ...

Embodiment 2

[0065] A kind of preparation method of lithium vanadyl phosphate lithium modified lithium-rich manganese-based layered lithium-ion battery cathode material of the present invention, its specific steps are as follows:

[0066] (1) Dissolve 0.03997mol of manganese acetate, 0.02997mol of cobalt nitrate, and 0.02997mol of nickel nitrate in 100mL of deionized water successively, add 0.09mol of citric acid and 0.11mol of lithium nitrate, then adjust the pH value to 7 with ammonia water, and Under the condition of a water bath at ℃, stir for 4 hours to form a precursor sol, and keep warm at 100℃ in air for 36 hours. Calcined in a muffle furnace, the temperature treatment is 450°C for 5h, 900°C for 12h. The lithium-rich manganese-based layered lithium-ion battery cathode material is obtained in powder form.

[0067] (2) Weigh 0.045mol of ammonium vanadate and dissolve it in 100mL of deionized water, stir for 2 hours in a water bath at 70°C, add 0.045mol of lithium nitrate, and finall...

Embodiment 3

[0071] A kind of preparation method of lithium vanadyl phosphate lithium modified lithium-rich manganese-based layered lithium-ion battery cathode material of the present invention, its specific steps are as follows:

[0072] (1) Dissolve 0.03997 mol of manganese acetate, 0.02997 mol of cobalt nitrate, and 0.02997 mol of nickel nitrate in 100 mL of deionized water in sequence, add 0.18 mol of citric acid, add 0.11 mol of lithium nitrate, and then adjust the pH value to 8 with ammonia water, at 80 ° C Stir for 4 hours in a water bath to form a precursor sol, and keep warm at 100° C. for 24 hours in air. Calcined in a muffle furnace, the temperature treatment is 450°C for 5h, 900°C for 12h. The lithium-rich manganese-based layered lithium-ion battery cathode material is obtained in powder form.

[0073] (2) Weigh 0.13365 mol of citric acid and dissolve it in 100 mL of deionized water, add 0.04455 mol of vanadium pentoxide, stir for 2 hours in a water bath at 80°C, add 0.0891 mo...

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Abstract

The invention discloses a positive electrode material of a lithium-rich manganese-based layered lithium-ion battery modified by lithium vanadyl phosphate, whose general chemical formula is xLi 2 MnO 3 ·(1-x)LiMO 2 ·yLiVOPO 4 , wherein, 0.1≤x≤0.9, M is Mn, Co and Ni, and the percentage of y in x is 0.1-99%; including manganese raw materials, nickel raw materials, cobalt raw materials, lithium salts, phosphorus sources, vanadium sources, complexing agents and reducing agent. The preparation method is as follows: using a sol-gel method to prepare lithium-rich manganese-based layered lithium-ion battery positive electrode materials and lithium vanadyl phosphate precursors, and then using a sol-gel liquid-phase coating method or a grinding solid-phase coating method to prepare vanadyl phosphate Lithium-modified lithium-rich manganese-based layered lithium-ion battery cathode material. The invention utilizes the characteristics of high energy density, stable platform, and slow attenuation of the lithium vanadyl phosphate to improve the electrochemical stability and cycle stability of the positive electrode material of the lithium ion battery, significantly improve the rate performance, and improve the problem of platform attenuation.

Description

technical field [0001] The invention relates to the field of lithium ion battery preparation, in particular to lithium vanadyl phosphate modified lithium-rich manganese-based layered lithium ion battery cathode material and a preparation method thereof. Background technique [0002] Energy crisis and environmental pollution have become serious threats to the sustainable development of human beings, and the development of renewable energy is imperative. The full development of clean energy such as solar energy, wind energy, hydrogen energy, and tidal energy is of great significance to the sustainable development of the world. However, these energies are discontinuous, so chemical power sources are very important as a device for converting and storing energy. [0003] In portable electronic devices, lithium-ion batteries with high energy density, light weight, and safety and reliability are widely used. For lithium-ion batteries, the cathode material has always been its core...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/58H01M10/0525
CPCH01M4/364H01M4/505H01M4/5825H01M10/0525Y02E60/10
Inventor 李东林李童心张巍樊小勇苟蕾张世龙
Owner CHANGAN UNIV