A high-performance lithium-sulfur battery positive electrode material and preparation method thereof
A cathode material, lithium-sulfur battery technology, used in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve problems such as unfavorable battery high rate performance, cycle performance degradation, battery damage, etc., to suppress the shuttle effect and improve stability. performance, loss prevention
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Embodiment 1
[0028] A high-performance lithium-sulfur battery cathode material, including elemental sulfur and MnO that stores elemental sulfur 2 / PPy composite microspheres;
[0029] Among them, the MnO 2 The preparation method of / PPy composite microsphere is:
[0030] Preparation of manganese carbonate: under the condition of mechanical stirring, add 7.14g manganese sulfate monohydrate into the mixed solvent containing 500mL deionized and 50mL ethanol. After stirring for 5 hours, the reaction was completed, centrifuged to remove the turbid liquid in the upper layer, washed with water for 3 times, and dried in a blast oven to obtain manganese carbonate powder;
[0031] Preparation of manganese dioxide: 2 g of dry MnCO 3 The powder was mixed with 580 mL of potassium permanganate aqueous solution with a concentration of 3 mmol / L for 5 hours, and 3 mol / L of hydrochloric acid was added dropwise until the system became strongly acidic, and then stirred for 12 hours, and the obtained product...
Embodiment 2
[0035] A high-performance lithium-sulfur battery cathode material, including elemental sulfur and MnO that stores elemental sulfur 2 / PPy composite microspheres;
[0036] Among them, the MnO 2 The preparation method of / PPy composite microsphere is:
[0037] Preparation of manganese carbonate: under the condition of mechanical stirring, quickly add ammonium bicarbonate aqueous solution to manganese sulfate ethanol aqueous solution, continue stirring for several hours, centrifuge to remove the upper layer of turbid liquid, wash three times with water, and obtain manganese carbonate after drying in a blast oven Powder; wherein, the concentration of the ammonium bicarbonate aqueous solution is 5mg / mL; the concentration of the manganese sulfate ethanol solution is 50mg / mL; the volume ratio of ethanol and deionized water in the manganese sulfate ethanol solution is 1:5; The ammonium bicarbonate aqueous solution is added into the manganese sulfate ethanol aqueous solution to be con...
Embodiment 3
[0042] A high-performance lithium-sulfur battery cathode material, including elemental sulfur and MnO that stores elemental sulfur 2 / PPy composite microspheres;
[0043] Among them, the MnO 2 The preparation method of / PPy composite microsphere is:
[0044] Preparation of manganese carbonate: under the condition of mechanical stirring, quickly add ammonium bicarbonate aqueous solution to manganese sulfate ethanol aqueous solution, continue stirring for several hours, centrifuge to remove the upper layer of turbid liquid, wash three times with water, and obtain manganese carbonate after drying in a blast oven Powder; wherein, the concentration of the ammonium bicarbonate aqueous solution is 50mg / mL; the concentration of the manganese sulfate ethanol solution is 5mg / mL; the volume ratio of ethanol and deionized water in the manganese sulfate ethanol solution is 1:15; The ammonium bicarbonate aqueous solution is added to the manganese sulfate ethanol aqueous solution to be cont...
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