Hydrothermal synthesis method of sodium cobalt manganate used as electrode material of aqueous magnesium ion battery and preparation method of aqueous battery

Abstract

The invention provides a hydro-thermal synthesis method of cobalt sodium manganite for a water-based magnesium ion battery electrode material and a preparation method of a water-based battery. The hydro-thermal synthesis method comprises the steps of (1) preparing a cobalt source compound and a manganese source compound into 0.5mol / L solutions, mixing the solutions, and meanwhile, adding ammonium bicarbonate and ethanol and violently stirring for 1 hour, (2) transferring the mixed solution to a reaction kettle to carry out a hydro-thermal reaction, and filtering, cleaning and drying the obtained precipitate, (3) performing ball milling mixing on the dried product with a sodium source compound of a stoichiometric ratio for 3-10 hours, and (4) putting the ball milled mixture into a muffle furnace for pretreatment and high-temperature calcination, thereby obtaining the final product. After being electrochemically tested, the material can be up to 67mAh / g at the current density of 10mA / g and in 1mol / L Na2SO4 electrolyte. The raw materials are wide in source, the cobalt sodium manganite is easy to prepare, and the water-based electrolyte is low in cost, environment-friendly and non-toxic.

Description

technical field [0001] The present invention relates to a hydrothermal synthesis method of an electrode material for a water-based magnesium ion battery, specifically a kind of electrode material sodium cobalt manganese sodium cobalt manganate that adopts a water-based electrolyte solution and can be used for cation deintercalation. 0.3 co 0.5 mn 0.5 o 2 hydrothermal synthesis method. Background technique [0002] From the perspective of long-term economic development, the large demand for lithium will cause the development of lithium battery energy storage systems to be limited by the global lithium source reserves. Therefore, research interest in sodium source compounds has been stimulated. So far, transition metal oxides Na x MO 2 have attracted special attention because of their potentially high specific capacity as well as rate capability. These oxides include Na x CoO 2 、Na x MnO 2 , NaCrO 2 、Na x VO 2 And their binary and ternary derivatives, the highest...

AI Technical Summary

Problems solved by technology

However, these materials have the following disadvantages: (1) multiple phase transitions are prone to occur during the Na intercalation / extraction process, showing several voltage plateaus in the charge / discharge characteristic curve; (2) probably due to these complex multiple phase transitions, these Layered oxides exhibit continuous capacity fading during cycling; (3) additionally these materials cannot withstand higher than 4.0V (vs.Na + / Na) deep charging, which will lead to incomplete use of Na + Store energy, once it is charged to ≥4.2V, the structure of these materials will be greatly damaged, resulting in a large irreversible specific capacity loss

Organic electrolytes have the disadvantages of high cost, poor safety, and toxicity

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