Fe3O4/Fe7S8 (at) C composite material, preparation method thereof, negative electrode of lithium ion battery, and lithium ion battery
A technology of lithium-ion batteries and composite materials, applied in the field of electrode materials, can solve problems affecting cycle life, structure collapse, material pulverization, etc., and achieve the effect of enhancing the overall structural stability, not easy to pulverization, and stable structure
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[0028] In another typical embodiment of the present application, a Fe 3 o 4 / Fe 7 S 8 The preparation method of @C composite material, the preparation method includes: step S1, prepare the mixture containing ferric sulfate and organic carbon source; 3 o 4 / Fe 7 S 8 @C composite material, and the protective sleeve is purged with purge gas during the calcination process, and the purge gas is nitrogen or an inert atmosphere.
[0029] The present application uses ferric sulfate as the iron source to prepare composite materials, wherein part of the ferric sulfate generates oxygen and ferric iron during calcination, and the organic carbon source generates a reducing atmosphere during calcination, and part of the ferric sulfate is reduced to iron polysulfide by the reducing atmosphere. And the trivalent iron of ferric sulfate will be partially reduced to ferrous iron during the calcination process (the degree of reduction depends on the amount of reducing atmosphere), and the f...
Embodiment 1
[0044] Weigh 0.5g of stearic acid, 0.5g of polyethylene glycol 4000 and 1.0g of ferric sulfate powder baked in a vacuum oven in advance, preliminarily grind it in a ceramic crucible for 10min, transfer it to a stirring tank, add 10mL of absolute ethanol, High-energy ball milling for 30 minutes ensures that the raw materials are evenly mixed to obtain a rheological phase mixture.
[0045] Transfer the rheological phase mixture after ball milling to a small porcelain boat, and cover a layer of tin foil on the surface of the porcelain boat, leaving only a small hole to ensure the stability of the reducing atmosphere. Place the porcelain boat in the temperature control area of the tube furnace, open For the gas distribution system and nitrogen cylinder, set the calcination program as normal temperature for one hour, then heat up to 550°C for one hour, then cool to room temperature naturally, and collect the materials after the end. The diameter of the small hole is 5mm, and the f...
Embodiment 2
[0047] Weigh 3.0 g of stearic acid, 3.0 g of polyethylene glycol 4000 and 1.0 g of ferric sulfate powder baked in a vacuum oven in advance, grind them in a ceramic crucible for 10 min, transfer them to a stirring tank, add 10 mL of absolute ethanol, High-energy ball milling for 30 minutes ensures that the raw materials are evenly mixed to obtain a rheological phase mixture.
[0048] Transfer the rheological phase mixture after ball milling to a small porcelain boat, and cover a layer of tin foil on the surface of the porcelain boat, leaving only a small hole to ensure the stability of the reducing atmosphere. Place the porcelain boat in the temperature control area of the tube furnace, open For the gas distribution system and nitrogen cylinder, set the calcination program as normal temperature for one hour, then heat up to 550°C for one hour, then cool to room temperature naturally, and collect the materials after the end. The diameter of the small hole is 5mm, and the flow r...
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