Manganese-doped modified zinc-ion battery cathode active material and its preparation method and application
A positive electrode active material, zinc ion battery technology, applied in the direction of battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of capacity decline, difficulty in rapid migration of zinc ions, and inability to meet high energy density zinc ion batteries, etc., to achieve improvement Effects of improving cycle performance and cycle stability
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[0061] The present invention also provides a method for preparing the above positive electrode material, which is characterized in that it comprises the following steps:
[0062] After mixing the raw materials including the positive electrode active material, the conductive agent and the binder, a dispersant is added, and the positive electrode material is formed after mixing.
[0063] Preferably, in the above preparation method, the dispersant is selected from water, ethanol, N-methylpyrrolidone, isopropanol or methanol.
[0064] After mixing the raw materials including the positive electrode active material, the conductive agent and the binder, a dispersant is added, the obtained product is coated on the conductive current collector, and the electrode of the zinc ion battery is obtained after drying.
[0065] Preferably, the conductive current collector is selected from carbon paper, carbon cloth, carbon felt, titanium foil, stainless steel foil, copper foil, aluminum foil, ...
Embodiment 1
[0103] Preparation of Mn 0.03 Zn 2.97 [Fe(CN) 6 ] 2 ·yH 2 O (referred to as MZHCF), the steps are as follows:
[0104] (1) Weigh 0.5693g ZnSO 4 ·7H 2 O and 0.0035g Mn(NO 3 ) 2 Add 100mL deionized water to make 0.0198mol / L ZnSO 4 and 0.0002mol / L of Mn(NO 3 ) 2 mixture;
[0105] (2) Weigh 0.6585g K 3 Fe(CN) 6 , add 100mL of deionized water to make a K of 0.02mol / L 3 Fe(CN) 6 aqueous solution;
[0106] (3) 100mL ZnSO 4 with Mn(NO 3 ) 2 Add the mixed solution to 100mL K at a rate of 50mL / h 3 Fe(CN) 6 In the aqueous solution, and maintain vigorous stirring (stirring speed is 500rpm), form a mixture;
[0107] (4) The mixture was kept under vigorous stirring (stirring speed was 500rpm) for 12 hours, and after standing for 6 hours, the product was obtained;
[0108] (5) Wash the reaction product with deionized water and ethanol, and dry it at 70°C for 12 hours to obtain Mn 0.03 Zn 2.97 [Fe(CN) 6 ] 2 ·yH 2 O solid.
Embodiment 2
[0110] Preparation of Mn 0.09 Zn 2.91 [Fe(CN) 6 ] 2 ·yH 2 O, the steps are as follows:
[0111] (1) Weigh 0.5579g ZnSO 4 ·7H 2 O and 0.0107g Mn(NO 3 ) 2 Add 100mL deionized water to make 0.0194mol / L ZnSO 4 and 0.0006mol / L of Mn(NO 3 ) 2 mixture;
[0112] (2) Weigh 0.6585g K 3 Fe(CN) 6 , add 100mL of deionized water to make a K of 0.02mol / L 3 Fe(CN) 6 aqueous solution;
[0113] (3) 100mL ZnSO 4 with Mn(NO 3 ) 2 The mixed solution was added to 100mL K at a rate of 100mL / h 3 Fe(CN) 6 In the aqueous solution, and maintain vigorous stirring (stirring speed is 800rpm), form a mixture;
[0114] (4) The mixture was kept under vigorous stirring (stirring speed was 800rpm) for 12 hours, and after standing for 6 hours, the product was obtained;
[0115] (5) Wash the reaction product with deionized water and ethanol, and dry it at 70°C for 12 hours to obtain Mn 0.09 Zn 2.91 [Fe(CN) 6 ] 2 ·yH 2 O solid.
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