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Preparation method and application of manganese-chromium binary metal oxide energy storage material

A technology of energy storage materials and binary metals, applied in the field of new materials, can solve problems such as poor rate performance and poor cycle stability, and achieve the effects of good rate performance, low environmental pollution, and inhibition of single-phase grain agglomeration

Active Publication Date: 2018-07-03
湖南烯顺新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention provides a preparation method and application of a manganese-chromium binary metal oxide energy storage material, aiming to solve the problem of poor cycle stability when single-phase metal oxides such as manganese or chromium are used as energy storage materials in the prior art to a certain extent , Poor magnification performance and other technical problems

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  • Preparation method and application of manganese-chromium binary metal oxide energy storage material

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Embodiment 1

[0026] A method for preparing a manganese-chromium binary metal oxide energy storage material, comprising the steps of:

[0027] The mixed solution of sodium hydroxide and sodium carbonate is added dropwise to the mixed solution of manganese chloride and chromium chloride by co-precipitation method, while stirring while adding dropwise, the concentration of manganese chloride solution in the mixed solution is 0.4mol / L, chlorine The concentration of chromium chloride solution is 0.2mol / L, the concentration of sodium hydroxide is 0.1mol / L, the concentration of sodium carbonate is 0.05mol / L, the molar ratio of manganese chloride and chromium chloride is 2:1, dropwise to Mix the solution to alkaline, stir for 0.5h after the dropwise addition; then age at 80°C for 12h; wash the precipitate, dry it and crush it; then raise the temperature at a rate of 5°C / min to 800°C, and maintain at 800°C for 120min. After grinding and sieving, a nano-flaky manganese-chromium binary metal oxide c...

Embodiment 2

[0029] The mixed solution of sodium hydroxide and sodium carbonate is added dropwise to the mixed solution of manganese chloride and chromium chloride by co-precipitation method, while stirring while adding dropwise, the concentration of manganese chloride solution in the mixed solution is 0.4mol / L, chlorine The concentration of chromium chloride solution is 0.1mol / L, the concentration of sodium hydroxide is 0.1mol / L, the concentration of sodium carbonate is 0.05mol / L, the molar ratio of manganese chloride and chromium chloride is 4:1, dropwise to Mix the solution to alkaline, stir for 0.5h after the dropwise addition; then age at 80°C for 12h; wash the precipitate, dry it and crush it; then raise the temperature at a rate of 5°C / min to 800°C, and maintain at 800°C for 120min. After grinding and sieving, a nano-manganese-chromium binary metal oxide composite material is obtained, which is the energy storage material.

Embodiment 3

[0031] The mixed solution of sodium hydroxide and sodium carbonate is added dropwise to the mixed solution of manganese chloride and chromium chloride by co-precipitation method, while stirring while adding dropwise, the concentration of manganese chloride solution in the mixed solution is 0.2mol / L, chlorine The concentration of chromium chloride solution is 0.2mol / L, the concentration of sodium hydroxide is 0.1mol / L, the concentration of sodium carbonate is 0.05mol / L, the molar ratio of manganese chloride and chromium chloride is 1:1, dropwise to Mix the solution to alkaline, stir for 0.5h after the dropwise addition; then age at 80°C for 12h; wash the precipitate, dry it and crush it; then raise the temperature at a rate of 5°C / min to 800°C, and maintain at 800°C for 120min. After grinding and sieving, a nano-manganese-chromium binary metal oxide composite material is obtained, which is the energy storage material.

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Abstract

The invention relates to a preparation method of a manganese-chromium binary metal oxide energy storage material. The preparation method comprises the following steps: dropwise adding mixed solution of sodium hydroxide and sodium carbonate into mixed solution of manganese chloride and chromium chloride by adopting a coprecipitation method until the mixed solution is alkaline, and then stirring for0.5-2 hours; then ageing for 6-48 hours at the temperature of 25-100 DEG C; washing precipitates, drying and grinding; and then heating and calcining in an aerobic atmosphere, milling, and sieving, thus obtaining the manganese-chromium binary metal oxide energy storage material. The obtained manganese-chromium binary metal oxide energy storage material product is of a nano sheet structure and canalleviate volume expansion effect, inhibit single phase crystal grain agglomeration and shorten a migration path of lithium ions in charging and discharging processes, so that the rate capability ofthe material product is improved, under the condition of 1A / g, from a third cycle, efficiency is higher than 97%, discharge specific capacity after 300 cycles is 913mAh / g, capacity retention ratio is112.0% compared with that of a second circle, and the material product has good application prospect in the aspect of negative electrode materials of a lithium ion battery.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to a preparation method and application of a manganese-chromium binary metal oxide energy storage material. Background technique [0002] As an important energy storage device, lithium-ion batteries have been widely used in electric vehicles and portable electronic devices. Commercially applied graphite materials have low specific capacity, poor rate performance, and are prone to produce dendrite lithium during high-current charging and discharging, causing safety problems. Therefore, there is an urgent need to develop high-energy density, high-rate performance, and good cycle stability. An anode material with low price and excellent safety performance. Transition metal oxides have high reversible capacity and are considered to be one of the most promising anode materials for lithium-ion batteries. Oxides of manganese and chromium are abundant in natural reserves, have low...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/44H01M10/0525
CPCH01M4/362H01M4/44H01M4/505H01M10/0525Y02E60/10
Inventor 张明瑜黎烈武黄启忠苏哲安杨鑫
Owner 湖南烯顺新材料有限公司
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