Synthesizing Cation Doped Stable Alpha Nickel Hydroxide Having Low Self Discharge Rate By Chemical Precipitation

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2022-2-11

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İlhan, Turan

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Nickel hydroxide is one of the commonly used active material in batteries and supercapacitors. It has two phases which are α-Ni(OH)2 and β-Ni(OH)2. The alpha phase has higher electrochemical performances due to its higher oxidation state but it has poor stability, chargeability and self-discharge performances. Studies in both industry and academiy is focusing on to solve those problems. Effects of cation doping and starting precursor on those problems were investigated in this study. Materials were synthesized by chemical co-precipitation method which is suitable for mass production. Co, Al and Mn were used as doping agents; Ni(NO3)2, Ni(SO4)2 and NiCl were used as starting precursors. Results show that low level of Co doping was enough to obtain better electrochemical performance but higher doping level of aluminum is required. Mn was acting as β-Ni(OH)2 stabilizer. Therefore, synthesizing parameters and the amount of doping level must be controlled carefully if manganese is used as dopant. In the case of starting precursors, all of them shows different eletrochemical properties but (SO4)-2 intercalated Ni(OH)2 has poor performance than others.

Subject Keywords

Alkaline Batteries, Nickel Based Cathode, α-Ni(OH)2, stability

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https://hdl.handle.net/11511/96339

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

T. İlhan, “Synthesizing Cation Doped Stable Alpha Nickel Hydroxide Having Low Self Discharge Rate By Chemical Precipitation,” M.S. - Master of Science, Middle East Technical University, 2022.