Carbon-coated zinc sulfide nanosphere cathode material for lithium ion battery and preparation method of carbon-coated zinc sulfide nanosphere cathode material
A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problem of difficult to obtain performance carbon-coated ZnS composite materials, difficult design and manufacture of high temperature and high pressure reactors, and difficult to large-scale industrialization. production and other problems, to achieve the effects of excellent cycle stability, excellent rate performance, and low cost
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Embodiment 1
[0031] The present embodiment provides a method for preparing a carbon-coated zinc sulfide nanosphere negative electrode material for a lithium ion battery, the method comprising the following steps:
[0032] (1) Preparation of zinc sulfide nanospheres: 0.02mol Zn(NO 3 ) 2 ·6H 2 O and 0.04mol thioacetamide were dissolved in 120mL of deionized water, then 2g of polyvinylpyrrolidone was added, and stirred vigorously until a uniform mixed solution was formed; the above mixed solution was placed in a water bath at 80°C and stirred for 2 hours, and a white precipitate was produced in the reaction ; The white precipitate was centrifuged and washed, and then dried in a vacuum oven at 80° C. for 2 hours to obtain zinc sulfide nanospheres. The content of polyvinylpyrrolidone in the zinc sulfide nanospheres is 50wt%.
[0033] (2) Preparation of carbon-coated zinc sulfide nanosphere precursor: ultrasonically disperse 3.9 g of the above-mentioned zinc sulfide nanospheres in a solution ...
Embodiment 2
[0039] (1) Preparation of zinc sulfide nanospheres: 0.02mol Zn(NO 3 ) 2 ·6H 2 O and 0.04mol thioacetamide were dissolved in 120mL of deionized water, then 2g of polyvinylpyrrolidone was added, and stirred vigorously until a uniform mixed solution was formed; the above mixed solution was stirred in a water bath at 80°C for 4 hours, and a white precipitate was produced in the reaction ; The white precipitate was washed by centrifugation and then dried in a vacuum oven at a temperature of 80° C. for 6 hours to obtain zinc sulfide nanospheres. The content of polyvinylpyrrolidone in the zinc sulfide nanosphere is 80wt%.
[0040] (2) Preparation of carbon-coated zinc sulfide nanosphere precursor: ultrasonically disperse 3.9 g of the above-mentioned zinc sulfide nanospheres in a solution composed of deionized water, absolute ethanol and 5wt% ammonia water to form a suspension, wherein the deionized 20mL of water, 15mL of absolute ethanol, 15mL of ammonia water, and a solid content...
Embodiment 3
[0045] (1) Preparation of zinc sulfide nanospheres: 0.02mol ZnCl 2 4H 2 O and 0.02mol dimethyl sulfide were dissolved in 120mL of deionized water, then 2g of polyethylene glycol was added, and stirred vigorously until a uniform mixed solution was formed; the above mixed solution was placed in a water bath at 80°C and stirred for 4 hours, and the reaction produced white Precipitation: The white precipitate was washed by centrifugation and then dried in a vacuum oven at a temperature of 100° C. for 6 hours to obtain zinc sulfide nanospheres. The content of polyethylene glycol in the zinc sulfide nanosphere is 10wt%.
[0046] (2) Preparation of carbon-coated zinc sulfide nanosphere precursor: ultrasonically disperse 2.8 g of the above-mentioned zinc sulfide nanospheres in a solution composed of deionized water, absolute ethanol and 5wt% ammonia water to form a suspension, wherein the deionized 20mL of water, 10mL of absolute ethanol, 15mL of ammonia water, and a solid content o...
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