N-doped carbon layer wrapped hollow-porous nickel oxide composite material and preparation method thereof
A hollow porous, nitrogen-doped carbon technology, used in nanotechnology for materials and surface science, electrochemical generators, electrical components, etc., can solve the problem of poor electronic conductivity and limit the electrochemical performance of nickel oxide. Battery cycle performance , low diffusion rate of lithium ions, etc., to achieve the effects of good discharge performance, easy promotion and large-scale production, and simple and effective preparation methods
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[0031] Example 1
[0032] In 20 mL of ethylene glycol, 0.895 g of nickel chloride hexahydrate, 1.23 g of sodium acetate, and 1.2 g of urea were added respectively, and the mixture was stirred at 20-25 °C for 3-5 h. After mixing uniformly, transfer it into a stainless steel reactor lined with PTFE, heat it at 160-200 °C for 18-24 h, cool to room temperature, and wash the product with ethanol and deionized water centrifugally for 6-8 times Afterwards, it was placed in a drying oven at 60-100 °C and vacuum dried for 12-24 h to obtain precursor nickel bicarbonate nanoparticles with a particle size of about 200-300 nm. Add 30 mg of the precursor to 5 mL of 1-butyl-3-methylimidazole tetrafluoroborate ionic liquid, and ultrasonically disperse for 5-15 min. Place the dispersed solution in a stainless steel reactor lined with PTFE, solvothermally treat it at 160-200 °C for 3 to 5 h, cool to room temperature, centrifuge, and then pass it at 80-120 °C Dry under vacuum for 12-24 h. Place ...
Example Embodiment
[0033] Example 2
[0034] In 20 mL of ethylene glycol, 1.0 g of nickel chloride hexahydrate, 1.23 g of sodium acetate, and 0.8 g of urea were added respectively, and the mixture was stirred at 20-25 °C for 3-5 h. After mixing uniformly, transfer it into a stainless steel reactor lined with polytetrafluoroethylene, heat it at 160-200 °C for 18-24 h, and cool to room temperature. After washing the product with ethanol and deionized water for 6-8 times by centrifugation, it is placed in a drying oven at 60-100 °C and vacuum-dried for 12-24 h to obtain precursor nickel bicarbonate nanoparticles with a particle size of about 200-300 nm . Add 80 mg of the precursor to 10 mL of 1-butyl-3-methylimidazole tetrafluoroborate ionic liquid, and ultrasonically disperse for 5-15 min. Place the dispersed solution in a stainless steel reactor lined with PTFE, solvothermally treat it at 160-200 °C for 3 to 5 h, cool to room temperature, centrifuge, and then pass it at 80-120 °C Dry under vacuum...
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[0047] Example 3
[0048] The hollow porous nickel oxide composite material coated with the nitrogen-doped carbon layer prepared in Example 1 was prepared according to the following method to prepare a lithium ion battery, and the battery performance test was performed on a constant current charge and discharge test system.
[0049] The hollow porous nickel oxide composite material, acetylene black, and PVDF wrapped in a nitrogen-doped carbon layer with a mass ratio of 70%: 15%: 15% were mixed and ground in a mortar for 20 minutes. Pyrrolidone is used as a solvent, stirred to form a uniform slurry, and coated on the foamed copper to prepare a negative electrode sheet. In a glove box filled with argon, lithium metal sheets are used as the positive electrode, and 1 mol / L LiPF is used. 6 / EC+DMC(1:1) organic solution is electrolyte, assembled into CR2025 button cell. The constant current charge and discharge test of the battery was performed on the LAND-CT2001A battery test system (r...
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