A carbon-coated germanium disulfide and its preparation method and application
A technology of germanium disulfide and carbon coating, which is applied in the direction of secondary batteries, electrochemical generators, active material electrodes, etc., can solve the problems of low energy density, poor battery cycle performance, and large volume expansion of sodium-ion batteries, and achieve Improved rate performance and cycle stability, low cost, and high productivity
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Embodiment 1
[0032] This embodiment includes the following steps:
[0033] (1) Use an electronic balance to weigh 0.3 g of germanium oxide with a purity of 99.99%, add 50 mL of pure water, and use a pipette to add 2 mL of ammonia solution to dissolve the germanium oxide. After fully stirring and dissolving, use a dropper to drop 18 wt% of hydrochloric acid to adjust the pH of the germanium oxide solution to 2.5 to obtain a germanium source solution.
[0034] (2) Use an electronic balance to weigh 250 mg of polystyrene pellets (particle size: 400-600 nm) and disperse them in the above-mentioned germanium source solution; add 10 mL of graphene oxide aqueous solution (5 mg / mL) dropwise, sonicate for 1.5 h, and then stir 3h, making the spheres made of polystyrene more uniformly dispersed and coated with graphene to obtain a suspension.
[0035] (3) Use a freeze dryer to freeze-dry the above suspension for 48 hours, and then carbonize it in an Ar atmosphere at a temperature of 700°C for 2 hour...
Embodiment 2
[0041] This embodiment includes the following steps:
[0042] (1) Use an electronic balance to weigh 0.2 g of germanium chloride with a purity of 99.99%, add 50 mL of pure water, and use a pipette to add 5 mL of ammonia solution to dissolve germanium oxide. After fully stirring and dissolving, use a dropper to add a concentration of 20 wt% hydrochloric acid, adjust the pH value of the germanium oxide solution to 3, and obtain a germanium source solution.
[0043] (2) Use an electronic balance to weigh 300mg of polystyrene pellets (particle size: 500-600nm) and disperse them in the above-mentioned germanium oxide solution, then add 20mL of graphene oxide aqueous solution (5mg / mL), ultrasonicate for 1.5h, and then stir again 3h, the spheres made of polystyrene are dispersed and coated with graphene more uniformly to form a suspension.
[0044] (3) Use a freeze dryer to freeze-dry the above suspension for 50 hours, and then carbonize it in an Ar atmosphere at a temperature of 90...
Embodiment 3
[0048] This embodiment includes the following steps:
[0049] (1) Use an electronic balance to weigh 0.3 g of germanium dioxide with a purity of 99.99%, add 50 mL of pure water, and use a pipette to add 2 mL of ammonia solution to dissolve the germanium oxide. After fully stirring and dissolving, use a dropper to drop 5 wt% of hydrochloric acid to adjust the pH of the germanium oxide solution to 1.9 to obtain a germanium source solution.
[0050] (2) Use an electronic balance to weigh 150 mg of polystyrene pellets (particle size 300-400 nm) and disperse them in the germanium source solution, add 15 mL of graphene oxide solution (5 mg / mL) and sonicate for 5 h, and then stir for 5 h to make the polystyrene The spheres made of styrene are more evenly dispersed and coated with graphene, and a suspension is obtained.
[0051] (3) Use a freeze dryer to dry the suspension for 48 hours, and then carbonize it in an Ar atmosphere at a temperature of 400°C for 2 hours. 2 Sulfurization ...
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