A kind of composite cathode material for sodium ion battery and preparation method thereof
A composite cathode material and sodium-ion battery technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of deteriorating material performance, material heterogeneity, poor doping effect, etc., and achieve uniform distribution of active materials, Uniform product distribution and improved high-rate cycle performance
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Embodiment 1
[0052] (1) present embodiment comprises the following steps: present embodiment design generates 0.03mol target product Na 2 Fe 0.8 Ni 0.2 P 2 o 7 / rGO, dissolve 0.85g graphene oxide in 80mL ethanol solution, add 1g ascorbic acid, ultrasonically disperse for 3h, add 0.024mol ferric nitrate and 0.006mol nickel acetate into the graphene oxide ethanol solution, stir well and then slowly add 0.06mol Ammonium dihydrogen phosphate, while supplemented by vigorous stirring, to obtain a mixed solution;
[0053] (2) Stir and heat the obtained mixed solution at 80° C. for 1 h, add 0.031 mol of sodium carbonate at a uniform rate, and at the same time supplement with vigorous stirring, react at 80° C. for 2 h, and then separate the solid from the liquid, wash with ethanol aqueous solution until the eluate is neutral, Drying, the resulting solid product is Na 2 Fe 0.8 Ni 0.2 P 2 o 7 Precursor of / rGO;
[0054] (3) The precursor obtained in step (2) is first sintered at 350°C under...
Embodiment 2
[0061] This embodiment includes the following steps:
[0062] (1) The design of this embodiment generates 0.03mol target product Na 2 Fe 0.8 Ni 0.2 P 2O 7 / rGO, dissolve 0.85g graphene oxide in 80mL ethylene glycol solution, add 1g ascorbic acid, ultrasonically disperse for 3h, add 0.024mol ferric nitrate and 0.006mol nickel acetate into the graphene oxide ethanol solution, stir well and add slowly 0.06mol ammonium dihydrogen phosphate, supplemented with vigorous stirring at the same time, to obtain a mixed solution;
[0063] (2) The obtained mixed solution was stirred and heated at 80 °C for 1 h, 0.03 mol of sodium carbonate was added at a constant rate, and at the same time, with vigorous stirring, the solid-liquid separation was performed after the reaction at 80 °C for 2 h, and the eluate was washed with ethanol solution until the eluate became neutral, Dry, the obtained solid product is Na 2 Fe 0.8 Ni 0.2 P 2 O 7 / rGO precursor;
[0064] (3) The precursor obtai...
Embodiment 3
[0067] This embodiment includes the following steps:
[0068] (1) This embodiment is designed to generate 0.03mol target product Na 2 Fe 0.5 Ni 0.5 P 2 O 7 / rGO, dissolve 0.85g graphene oxide in 80mL ethanol solution, add 1g ascorbic acid for ultrasonic dispersion for 3h, add 0.015mol ferric nitrate and 0.015mol nickel acetate into the graphene oxide ethanol solution, stir well and slowly add 0.06mol phosphoric acid Ammonium dihydrogen, supplemented with vigorous stirring at the same time, to obtain a mixed solution;
[0069] (2) The obtained mixed solution was stirred and heated at 80 °C for 1 h, 0.032 mol of sodium carbonate was added at a constant speed, and at the same time, with vigorous stirring, the solid-liquid separation was carried out after the reaction at 80 °C for 2 h, and the eluate was washed with an aqueous ethanol solution until the eluate was neutral. Dry, the obtained solid product is Na 2 Fe 0.5 Ni 0.5 P 2 O 7 / rGO precursor;
[0070] (3) The pre...
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