fes 2 Nanocrystal and its synthesis method and application
A nanocrystalline and lithium-ion battery technology, applied in nanotechnology, secondary battery repair/maintenance, secondary battery charging/discharging, etc., can solve the problem of insufficient uniformity of size and shape, uneven particles, and poor cycle stability etc. to achieve excellent electrochemical performance, simple preparation process, and easy large-scale production
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[0026] An aspect of the embodiments of the present invention provides a FeS 2 A method for synthesizing nanocrystals, comprising:
[0027] Mix sulfur source and iron source in water, and react hydrothermally at 100-200°C for more than 8 hours to obtain FeS 2 Precursor;
[0028] The FeS 2 The precursor is crystallized at a high temperature of 400-600°C for more than 0.5h in a protective atmosphere to obtain FeS 2 Nanocrystalline;
[0029] Wherein the sulfur source includes soluble polysulfides, and the iron source includes soluble iron salts and / or soluble ferrous salts.
[0030] Further, the gas used to form the protective atmosphere includes argon and / or nitrogen, but is not limited thereto.
[0031] More preferably, the hydrothermal reaction time is 8-48 hours.
[0032] More preferably, the high-temperature crystallization time is 0.5-6 hours.
[0033] An aspect of the embodiments of the present invention provides a FeS 2 A method for synthesizing a precursor, compri...
Embodiment 1
[0046] Embodiment 1: the Na of 480mg 2 S·9H 2 O was dissolved in 20ml ultrapure water, and 64mg of sulfur powder was added, and after magnetic stirring for 6h, uniform and transparent Na 2 S 2yellow solution. 312mg of FeSO 4 Dissolve in 10ml of ultrapure water and add dropwise to the yellow solution while stirring to form a homogeneous reaction solution. The solution was transferred to a polytetrafluoroethylene reactor, placed in a constant temperature drying oven and kept at 180° C., and the reaction time was 12 hours. After the reaction kettle was naturally cooled to room temperature, it was taken out, the product was collected by suction filtration, washed several times with deionized water and absolute ethanol, and then vacuum-dried at 50°C for 24 hours. The obtained dried samples were heat treated in a programmed temperature-controlled box furnace with a heating rate of 17°C / min, kept at a constant temperature of 500°C for 30min under an argon atmosphere, and then na...
Embodiment 2
[0047] Embodiment 2: the Na of 480mg 2 S·9H 2 O was dissolved in 20ml ultrapure water, and 64mg of sulfur powder was added, and after magnetic stirring for 6h, uniform and transparent Na 2 S 2 yellow solution. 312mg of FeSO 4 Dissolve in 10ml of ultrapure water and add dropwise to the yellow solution while stirring to form a homogeneous reaction solution. The solution was transferred to a polytetrafluoroethylene reactor, placed in a constant temperature drying oven and kept at 200° C., and the reaction time was 12 hours. After the reaction kettle was naturally cooled to room temperature, it was taken out, the product was collected by suction filtration, washed several times with deionized water and absolute ethanol, and then vacuum-dried at 50°C for 24 hours. The obtained dried samples were heat treated in a programmed temperature-controlled box furnace with a heating rate of 17°C / min, kept at a constant temperature of 500°C for 30min under an argon atmosphere, and then n...
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