Preparation method of solid spherical multiple-ring-shaped lithium-rich manganese-based solid solution cathode material oxide precursor

A lithium-rich manganese-based, positive electrode material technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as mass production, and achieve the effects of improving cycle stability, uniform product quality, and environmental friendliness

Active Publication Date: 2019-09-13
HUNAN ZHENGYUAN ENERGY STORAGE MATERIALS & DEVICE INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In related technologies, different researchers use different methods, but there are some problems that are difficult to prepare in large quantities in industrial production

Method used

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  • Preparation method of solid spherical multiple-ring-shaped lithium-rich manganese-based solid solution cathode material oxide precursor
  • Preparation method of solid spherical multiple-ring-shaped lithium-rich manganese-based solid solution cathode material oxide precursor
  • Preparation method of solid spherical multiple-ring-shaped lithium-rich manganese-based solid solution cathode material oxide precursor

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Embodiment 1

[0039] Prepare 2mol / L sodium carbonate precipitant solution, by molar ratio NH 4 HCO 3 :NH 3 •H 2 O=1:4 to prepare a 0.1mol / L complexing agent solution, weigh manganese sulfate, nickel sulfate, and cobalt sulfate according to the molar ratio Mn:Ni:Co=4:1:1, and dissolve them in deionized water to prepare 2mol / L L mixed metal salt, adopt the co-precipitation method to add the mixed metal salt solution, the precipitating agent sodium carbonate solution, and the complexing agent solution dropwise into the deionized aqueous solution, and control the mixed metal salt solution, the precipitating agent sodium carbonate solution, and the complexing agent solution The molar ratio is 1:1:0.4, react for 16 hours under the conditions of pH value 7.5, stirring speed 1500 rpm, temperature 60°C, and protective atmosphere Ar gas. Impurities, and then vacuum-dried at a temperature of 100 °C for 8 hours to obtain a solid spherical ternary manganese-nickel-cobalt carbonate precursor (Mn 4 / 6 ...

Embodiment 2

[0045] Prepare 2mol / L potassium carbonate precipitant solution, prepare 0.1mol / L ammonia complexing agent solution, weigh manganese sulfate, nickel sulfate, cobalt sulfate by molar ratio Mn:Ni:Co=4:1:1, and dissolve Prepare 2mol / L mixed metal salt in deionized water, and add the mixed metal salt solution, precipitant solution, and complexing agent solution dropwise into the deionized aqueous solution by coprecipitation method, and control the mixed metal salt solution, precipitant sodium carbonate solution , The molar ratio of the complexing agent solution is 1:1:0.4, the pH value is 8, the stirring speed is 1200 rpm, the temperature is 50°C, and the protective atmosphere is N 2 React for 20 hours under the condition of air, suction filter after the reaction, wash repeatedly to remove impurities, and then carry out vacuum drying treatment at a temperature of 110 ° C and a time of 10 hours to obtain a solid spherical ternary manganese nickel cobalt carbonate precursor (Mn 4 / 6 ...

Embodiment 3

[0050] Precipitating agent solution of potassium carbonate of preparation 0.01mol / L, the aqueous ammonia complexing agent solution of preparation 0.01mol / L, take by weighing manganese nitrate, nickel nitrate, cobalt nitrate by molar ratio Mn:Ni:Co=4:1:1, and Dissolve in deionized water to prepare 0.01mol / L mixed metal salt, add the mixed metal salt solution, precipitant solution and complexing agent solution dropwise into the deionized aqueous solution by co-precipitation method, control the mixed metal salt solution, precipitant carbonic acid The molar ratio of the potassium solution and the complexing agent solution is 1:1:0.4, and the reaction is carried out for 2 hours under the conditions that the pH value is 7, the stirring rate is 2000 rpm, the temperature is 20°C, and the protective atmosphere is Ar gas. Suction filtration, repeated washing, removal of impurities, and vacuum drying at a temperature of 80°C for 12 hours to obtain a solid spherical ternary manganese nicke...

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Abstract

The invention relates to a preparation method of a solid spherical multiple-ring-shaped lithium-rich manganese-based solid solution cathode material oxide precursor, belonging to the field of electrode material preparation. The lithium-rich manganese-based solid solution cathode material oxide precursor prepared by the invention has a solid spherical multiple-ring-shaped structure, a liquid-liquidcoprecipitation method is adopted to obtain a carbonate precursor, and the solid spherical multiple-ring-shaped lithium-rich manganese-based solid solution cathode material oxide precursor is obtained by performing special calcination treatment on the carbonate precursor. The lithium-rich manganese-based solid solution cathode material prepared from the solid spherical multiple-ring-shaped structure oxide precursor has the excellent electrochemical performance and high compaction density. The solid spherical multiple-ring-shaped structure oxide precursor, prepared by the method, is uniform inelement distribution, high in yield, simple in process, environment-friendly, efficient, energy-saving, uniform in product quality, good in repeatability and capable of achieving large-scale production.

Description

technical field [0001] The invention belongs to the field of electrode material preparation, and in particular relates to a preparation method of a solid spherical multi-ring lithium-rich manganese-based solid solution cathode material oxide precursor. Background technique [0002] The current energy density level of lithium-ion battery technology is about 100-150Wh / kg. If the single mileage of electric vehicles is to reach 500 kilometers equivalent to that of traditional fuel vehicles, the energy density of battery cells must reach more than 300Wh / kg. . However, if the energy density index of 250Wh / kg or even 300Wh / kg is to be achieved by 2020, the current commercially applied cathode materials cannot achieve it. The lithium-rich manganese-based solid solution cathode material has the advantages of large discharge capacity and low raw material cost, and is considered to be an important candidate cathode material for the next generation of high-energy density, low-cost lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525
CPCH01M4/364H01M4/505H01M4/525Y02E60/10
Inventor 许保磊吴春萍李荐刘兰英李娜杨伏良
Owner HUNAN ZHENGYUAN ENERGY STORAGE MATERIALS & DEVICE INST
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