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

A lithium-ion battery and positive electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of limited commercialization, poor rate performance and cycle stability, low initial cycle efficiency, etc., and achieve discharge platform and capacity decay Effects of slowing down, rate performance improvement, and electrochemical stability improvement

Active Publication Date: 2021-08-03
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is considered to be the commercialized LiCoO 2 However, its low first cycle efficiency, poor rate performance and cycle stability limit its commercialization

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] A lithium tungstate modified lithium-rich manganese-based layered lithium-ion battery positive electrode material, the preparation method comprising the following steps:

[0086] (1) Dissolve 0.067 mol of manganese formate, 0.0167 mol of cobalt formate, 0.0167 mol of nickel formate, and 0.15 mol of lithium formate in 30 mL of ethanol in sequence, and then add 0.1 mol of acetylacetone after fully dissolving, and stir for 3 hours in a water bath at 80°C. The precursor sol was obtained, and kept at 100°C for 24 hours in the air; then calcined in a muffle furnace, specifically at 450°C for 5 hours, and then at 900°C for 12 hours, to obtain a powdery lithium-rich manganese-based layered lithium-ion battery cathode material , its chemical formula is: 0.5Li 2 MnO 3 0.5LiMn 1 / 3 Ni 1 / 3 co 1 / 3 o 2 .

[0087] (2) Weigh 0.00046mol of citric acid and dissolve it in 20mL of deionized water, add 0.0000255mol of ammonium metatungstate, stir for 2 hours in a water bath at 70°C, th...

Embodiment 2

[0090] A lithium tungstate modified lithium-rich manganese-based layered lithium-ion battery positive electrode material, the preparation method comprising the following steps:

[0091] (1) Dissolve 0.333moL of manganese acetate, 0.083moL of cobalt nitrate, 0.083moL of nickel nitrate, and 0.75mol of lithium nitrate in 20mL of deionized water in sequence, then add 0.5mol of citric acid, adjust the pH value to 7 with ammonia water, and place in a water bath at 50°C Stir for 5 hours under the same conditions to form a precursor sol, keep warm at 100°C for 24 hours in the air; then calcinate in a muffle furnace, specifically: first calcinate at 450°C for 5 hours, then calcinate at 900°C for 12 hours; obtain powder Lithium-rich manganese-based layered lithium-ion battery cathode material, its chemical formula is: 0.5Li 2 MnO 3 0.5LiMn 1 / 3 Ni 1 / 3 co 1 / 3 o 2 .

[0092] (2) Weigh 0.0000573mol of citric acid and dissolve it in 20mL of deionized water, add 0.00000318mol of ammoniu...

Embodiment 3

[0095] A lithium tungstate modified lithium-rich manganese-based layered lithium-ion battery positive electrode material, the preparation method comprising the following steps:

[0096] (1) Weigh 1.2moL of lithium nitrate, 0.533moL of manganese sulfate, 0.133moL of nickel sulfate, and 0.133moL of cobalt sulfate and dissolve them in 30ml of ethylene glycol ether, and then add 0.1moL of ethylenediaminetetraacetic acid for complexation after fully dissolving. Stir in a water bath at 70°C for 3 hours to obtain a precursor sol, which is kept at 100°C in air for 24 hours; then calcined in a muffle furnace, specifically at 450°C for 5 hours, and then calcined at 900°C for 12 hours to obtain lithium-rich manganese Grass-layer lithium-ion battery cathode material, its chemical formula is: 0.5Li 2 MnO 3 0.5LiMn 1 / 3 Ni 1 / 3 co 1 / 3 o 2 .

[0097] (2) Weigh 0.00138mol of citric acid and dissolve it in 20mL of deionized water, add 0.0000764mol of ammonium metatungstate, stir for 2 hour...

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Abstract

The invention specifically discloses a lithium tungstate modified lithium-rich manganese-based layered lithium-ion battery positive electrode material, the general chemical formula of which is (xLi 2 MnO 3 ·(1-x)LiMO 2 ) / yLi 2 WO 4 ; wherein, 0.1≤x≤0.9, 0.001≤y≤0.4, M is Mn, Co and Ni; it includes the following raw material components: manganese raw material, nickel raw material, cobalt raw material, lithium salt, tungsten salt, complexing agent, reducing agent and liquid solvent; and discloses a preparation method of lithium tungstate modified lithium-rich manganese-based layered lithium-ion battery cathode material. The invention utilizes the good conductivity of lithium tungstate to greatly improve the rate performance of the positive electrode material of the lithium ion battery, improve its electrochemical stability, and significantly improve the cycle stability of the positive electrode material of the lithium ion battery, making the present invention The discharge platform and capacity decay of the invented lithium tungstate-coated lithium-rich manganese-based layered lithium-ion battery cathode material are slowed down.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-tungstate modified lithium-rich manganese-based layered lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] With the rapid economic development and the continuous acceleration of the industrialization process, the human demand for energy is increasing. Due to the over-exploitation of resources such as coal and oil, traditional energy sources are increasingly exhausted. Moreover, during the combustion of fossil fuels, a large amount of harmful gas and dust will be produced, and the environmental pollution is very serious. It has brought a huge threat to the environment on which human beings depend for survival. It can be seen that it is imperative to develop sustainable green energy. [0003] The development of non-polluting sustainable green energy is expected to alleviate environmental pollution. New ene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/362H01M4/485H01M4/505H01M4/525H01M4/624H01M10/0525Y02E60/10
Inventor 李东林孔祥泽陈光琦赵坤赵珍珍樊小勇
Owner CHANGAN UNIV
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