| The theoretical research, current application and development concerning crystal strcture, electrochemical behaviour and preparing technics of nickel oxyhydroxide as positive material are outlined in the thesis.Using K2S2O8 as oxidantant and Ni(OH)2 as raw material, the synthetical conditions ofβ-NOOH was studied through chemical oxidation method. The morphological/ structural features and electrochemical behaviour of the product was analysed. The best technical conditions through orthogonal experiment and independent experiment follow as below: Mol concentration of KOH from 0．6 to 1mol/L, Reaction temperature at 40℃, Reaction time at 18h and Mass ratio of Ni(OH)2 and K2S2O8 at 1:4．48．The morphological/ structural features are analysed by X-ray diffraction and scan electron micrograph. The XRD patterns indicates that the synthesized product isβ-NiOOH with hexagonal crystal system. It is manifested from SEM that crystal structure is spheric, and the distribution range of crystal diameter covers from 2μm to 25μm. The crystal is well-distributed in absence of agglomeration.It can be seen from the discharge test ,discharge/charge test and cyclic voltammetry test that the best sample has excellent discharging performance and electrochemical cyclic stability, and it is fit for positive electrode of Zn-Ni battery.Nowadays the research on nickel oxyhydroxide has been the highlight of electrode materials. How to prepare nickel oxyhydroxide with high purity and excellent electrochemical performance is critical to industrial applications. Although nickel oxyhydroxide with high specific discharge capacity has been successfully synthesized in the experiments, there are some problems to be investigated. The further research on synthesis technics of nickel oxyhydroxide shall move forward integrated performance of Ni-Zn cell and boost the application and promotion. |
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