Research On Desulfurization Of Nano-ZnO And Transformation Of Waste Desulfurizer Into Electrode Materials

In recent years,metal sulfides have been regarded as the most promising anode materials for lithium ion batteries and sodium ion batteries because of their high theoretical specific capacity,low cost,and no pollution of green.The electrochemical performance is improved by preparing materials with good morphology and structure.Firstly,the rod-shaped nano zinc oxide was prepared by a uniform precipitation method,explored the effects of different reaction times and temperatures on materials,when the temperature was 60 ℃ and the time was 6 h,the rod-shaped zinc oxide having a uniform distributed and a diameter of 150-200 nm was obtained.After investigation,the reaction was carried out at 90 ℃ for 1 h,and aged for 12 h to obtain spherical zinc oxide with uniform particle size.The prepared rod-shaped zinc oxide and spherical zinc oxide were desulfurized at a desulfurization temperature of 350 ℃ and a gas velocity of 40 sccm,explored the effects of different desulfurization times on desulfurization products,with the increase of desulfurization time,the hollow structure of the product became more and more obvious,and the optimal hollow structure was obtained at 40 h.The hollow rod-shaped copper sulfide was obtained by transforming the rod-shaped desulfurization product,when it was used as the electrode material of sodium ion battery,the initial specific capacity is 456.9 m Ah·g^-1 when the current density was 0.1 A·g^-1,the first coulomb efficiency is as high as 91.6%,and the specific capacity is 392.5 m Ah·g^-1 after 60 cycles,capacity retention rate reach 86%.When it was used as a negative electrode material in a lithium ion battery,its first specific capacity is 1478.6 m Ah·g^-1 at a current density of 0.1 A·g^-1,and the specific capacity is 706.1 m Ah·g^-1 after 450 cycles,the capacity retention rate is 48%.After conversion to obtain hollow spherical copper sulfide,when it was used as the electrode material of sodium ion battery,the initial specific capacity is 467.7 m Ah·g^-1 when the current density was 0.1 A·g^-1,and the first coulomb efficiency is 71.78%,after 60 cycles,the specific capacity is 272.9 m Ah·g^-1,and the capacity retention rate reach 58%.When it was used as a negative electrode material in a lithium ion battery,its first specific capacity is 1004.2 m Ah·g^-1 at a current density of 0.1 A·g^-1,and the specific capacity is 440.7 m Ah·g^-1 after 500 cycles,the capacity retention rate is 44%.Figure 35;Table 2;Reference 145...