Negative electrode material and preparation method thereof, negative electrode of lithium ion battery and lithium ion battery
A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of short life and poor rate performance of negative electrode materials, and achieve high rate performance, high electron affinity, and long life. Effect
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Embodiment 1
[0050]Accurately weigh 1.8g of manganese acetylacetonate and 0.8g of nitrilotriacetic acid and add them to a mixed solution of 5ml of deionized water and 35ml of isopropanol, stir and dissolve, then transfer to a reaction kettle, heat to 180°C and keep for 12 hours , centrifuged to collect the precipitate, and washed twice with ethanol and dried to obtain the manganese precursor nanowire; get 100mg manganese precursor nanowire and 50mg dopamine hydrochloride and join in 50ml tris(hydroxymethyl)aminomethane buffer solution, stir for 72 Hours, centrifuge to collect the precipitate, wash it twice with ethanol and dry it to obtain the dopamine-wrapped manganese nanowire intermediate; mix the dopamine-wrapped manganese nanowire intermediate with 3-methylthioaniline in a mass ratio of 1:4 Finally, after sintering at 450° C. for 2 hours in an argon atmosphere, a nitrogen-sulfur co-doped carbon-modified manganese sulfide composite negative electrode material is obtained.
Embodiment 2
[0052] Accurately weigh 2g of manganese sulfate and 1.2g of chitosan, add them to a mixed solution of 10ml of deionized water and 30ml of isopropanol, stir and dissolve, transfer to a reaction kettle, heat to 200°C and keep for 12 hours, centrifuge to collect the precipitate 50mg of manganese precursor nanowires and 100mg of dopamine hydrochloride were added to 50ml of tris(hydroxymethyl)aminomethane buffer, stirred for 24 hours, and centrifuged to collect the precipitate , and washed twice with ethanol and dried to obtain the dopamine-wrapped manganese nanowire intermediate; after mixing the dopamine-wrapped manganese nanowire intermediate with ammonium thiosulfate at a mass ratio of 2:1, the After sintering in the atmosphere for 4 hours, a nitrogen-sulfur co-doped carbon-modified manganese sulfide composite negative electrode material was obtained.
Embodiment 3
[0054] Accurately weigh 0.8g of manganese hypophosphite, 1g of manganese phosphate and 0.75g of acetonitrile and add them to a mixed solution of 65ml of deionized water and 15ml of isopropanol, stir and dissolve, then transfer to a reaction kettle, heat to 160°C and keep for 10 hour, centrifuge to collect the precipitate, and after drying twice with ethanol, obtain the manganese precursor nanowire; get 100mg manganese precursor nanowire and 50mg dopamine hydrochloride and join in the 50ml tris(hydroxymethyl)aminomethane buffer solution, stir After 72 hours, the precipitate was collected by centrifugation, washed twice with ethanol and dried to obtain the dopamine-wrapped manganese nanowire intermediate; after mixing the dopamine-wrapped manganese nanowire intermediate with liter sulfur in a mass ratio of 1:5, the °C and sintered in an argon atmosphere for 4 hours, a nitrogen-sulfur co-doped carbon-modified manganese sulfide composite anode material was obtained.
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