| Nickel is one of the strategic metals,The amount of China’s nickel resource is limited.So,there has been a necessary trend to recycle nickel from secondary resources.This project comes from Yunnan province academician workstation research projects,which is mainly to study the hydrometallurgical extraction process of nickel-containing scrap,waste from the study of nickel-hydrogen batteries leaching,purification and purification of metallic nickel.Because of the short service life of issues nickel-hydrogen batteries,there has been too many used nickel-hydrogen batteries which can never be used again.The conflicts between demand and supply of nickel is also increasing.In order to resolve the contradiction,improve the appropriate utilization of resources,recycling nickel-containing scrap is an solution.Wasted nickel hydrogen battery contains a lot of valuable resources,waste not only brings direct waste of resources,but also will lead to a series of environmental problems.Therefore,on the one hand,the recycle of valuable resources in the batteries can alleviate the constraints of resource,on the other hand,it can helps battery industry to developed sustainable.Recently,the metal carbon-based composite material has the excellent performance of the carbon material,and the presence of metal materials aslo can make up for the lack of carbon materials in many ways.It makes the carbon and metal composite material has a great potential application value.Due to the addition of metal materials,the conductivity,specific capacity and other properties have also been greatly improved.In this study,the factors that affect the rate of leaching of nickel(including leaching temperature,leaching time,the concentration of sulfuric acid,hydrogen peroxide dosage,stirring speed and leaching time)were discussed and the study has designed orthogonal experiments,this article used sulfuric acid in the leaching process,and added H2O2 the during the reaction.This study has added anhydrous sodium sulfate to dislodge rare earth elements,and used dimethylglyoxime to extracted nicked from the solution which red flocculent finally.Then the study used complex with sulfuric acid to dissolve and filtered to gain diacetyldioxime nickel sulfate solution.In this study,nickel,cobalt leaching rate can reach respectively 99.40%,96.26%,rare earth leaching rate reached almost 100%.The optimum conditions were as follows:leaching temperature was 93℃,sulfuric acid dosage was 6.5ml/g,sulfuric acid concentration was 4.5mol/L,hydrogen peroxide dosage was 5ml/g,stirring speed was 1300r/min.,leaching time was 120min The success rate of nickel leaching rate reached 99.8%.The Ni/C nanocomposite prepared at 600 ℃ under the Ar inherits the rod-like or cylindrical structure of the butanedione oxime and its particles are smaller,but as the negative electrode of the lithium ion battery.The first charge/discharge ratio of the material is not high,and the attenuation is faster during the cycle.The possible reason is that during the cycle,the amorphous carbon in the material is mainly involved in the circulation process.The obtain NiO/Ni/C nanomaterials were obtained from Ni/C nanomaterials,The application of electrode materials obtained under different oxidation temperature and different oxidation time conditions in lithium ion batteries was discussed.The results show that the material prepared at 180℃ for 1hours had a good performance.The results show that the material has good performance in the five-cycle magnification.The discharge capacity can be maintained at 1000 mAh/g after the end of the 20 cycles of each cycle,and the capacity retention rate is high and also suitable for high power discharge. |
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