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High-voltage lithium ion battery positive electrode material with spinel structure and preparation method thereof

A spinel structure, lithium-ion battery technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve problems such as high cost, low temperature, agglomeration, etc., and achieve easy industrial production, simple synthesis process, and material properties. stable effect

Active Publication Date: 2014-07-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the preparation process, uneven mixing of the three raw materials is likely to occur, the particle size deviation is large, and there is obvious agglomeration phenomenon, and the electrochemical performance of the obtained material is not very ideal.
The biggest feature of the sol-gel method is that it can mix the raw materials at the molecular level, and the temperature required for the preparation is lower than that of the solid-phase method. The performance is also good, but organic reagents are generally used in the synthesis process, the cost is high, and it is not environmentally friendly enough, and there are certain difficulties in mass production

Method used

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  • High-voltage lithium ion battery positive electrode material with spinel structure and preparation method thereof
  • High-voltage lithium ion battery positive electrode material with spinel structure and preparation method thereof
  • High-voltage lithium ion battery positive electrode material with spinel structure and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] The stoichiometric ratio of manganese acetate and nickel acetate was added to deionized water and dissolved to prepare a solution a with a concentration of 0.5 mol / L. At the same time, an appropriate amount of oxalic acid was weighed to prepare a solution b with a concentration of 0.5 mol / L. Under continuous stirring and a water bath at 40°C, solution b was slowly added to solution a, and the reaction was continued for 3 h, and then the precipitate and the mother liquor were evaporated to dryness at 110°C to obtain the oxalate precursor precipitate of nickel and manganese powder. The precursor powder was pretreated in a muffle furnace at 550 °C for 5 h to obtain black nickel-manganese oxide powder. Mix stoichiometric lithium carbonate with the obtained nickel-manganese oxide powder (excess lithium carbonate 10%), add ethanol as a grinding aid, grind fully, and then bake at 750-950°C for 15 h, and cool naturally to Room temperature, and finally grind it to get the posit...

Embodiment 2

[0037] The stoichiometric ratio of nickel nitrate hexahydrate and manganese nitrate solution was added to deionized water and dissolved to prepare a solution a with a concentration of 0.5 mol / L. At the same time, an appropriate amount of oxalic acid was weighed to prepare a solution b with the same concentration of 0.5 mol / L. Under continuous stirring and a water bath at 40°C, solution b was slowly added to solution a, reacted for 3 h, and then the precipitate and mother liquor were evaporated to dryness at 110°C to obtain nickel-manganese oxalate precursor powder. The nickel-manganese oxalate precursor powder was pretreated in a muffle furnace at 550 °C for 5 h to obtain a black powder. Fully mix the stoichiometric ratio of lithium carbonate with the obtained black powder (excess lithium carbonate 10%), add isopropanol as a grinding aid, fully grind, then place it at 900 ° C for 15 h, cool naturally to room temperature, and finally Grind it into powder to obtain the positive ...

Embodiment 3

[0039] The stoichiometric ratio of manganese acetate and nickel acetate was added to deionized water and dissolved to prepare a solution a with a concentration of 0.5 mol / L. At the same time, an appropriate amount of oxalic acid was also weighed to prepare a solution b with a concentration of 0.5 mol / L. Under continuous stirring and a water bath at 40 °C, solution b was slowly added to solution a, and the reaction was continued for 3 h after the addition was complete, then the precipitate was filtered, washed several times, and dried to obtain nickel-manganese oxalate precursor powder. The precursor powder was pretreated in a muffle furnace at 550 °C for 5 h to obtain a black powder. Fully mix the stoichiometric ratio of lithium carbonate with the obtained black powder (10% excess lithium carbonate), add acetone as a grinding aid, and grind thoroughly. Then bake at 900 °C for 15 h, cool naturally to room temperature, and finally grind it to obtain the positive electrode materi...

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Abstract

The invention relates to a high-voltage lithium ion battery positive electrode material with a spinel structure and a preparation method thereof. The preparation method comprises the preparation steps of preparing a mixed salt solution and preparing precursor substance sediment in the solution by using a precipitant; standing and aging; separating and drying; roasting to obtain a multi-element oxide precursor with the spinel structure; mixing the multi-element oxide precursor with lithium salt and grinding; and roasting to obtain the positive electrode material LiM<x+y>Ni<0.5-x>Mn<1.5-y>O4 with the spinel structure, wherein M is Co, Cr, Fe, Ce, Al, Zn or Mg; x is more than or equal to 0 and less than or equal to 0.25 and y is more than or equal to 0 and less than or equal to 0.25. The LiM<x+y>Ni<0.5-x>Mn<1.5-y>O4 positive electrode material prepared by the method has high purity and stable electrochemical properties; a related technological process is simple and easy to operate, is environmentally friendly and is suitable for large-scale industrial production application.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials, in particular to a high-voltage lithium ion battery positive electrode material with a spinel structure and a preparation method thereof. Background technique [0002] As the global energy problems and the environmental problems caused by the massive burning of fossil fuels are becoming more and more serious, the development of electric vehicles that do not depend on fossil fuels and are environmentally friendly has become an important development theme in countries all over the world. Because of its many unique advantages, lithium-ion batteries are regarded as a secondary battery that is most likely to be used in electric vehicles on a large scale. The research on new lithium-ion batteries has become one of the most important research topics in related fields. one. Among the many components that affect the performance of lithium-ion batteries, the positive electrode materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122H01M4/505H01M4/525H01M10/0525C01G53/54C01P2002/72C01P2004/03C01P2004/61C01P2006/40Y02E60/10
Inventor 廖世军柳祖善肖冠任婉杜丽曾建皇宋慧宇
Owner SOUTH CHINA UNIV OF TECH
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