Structure and lithium storage performances of nickel hydroxides synthesized with different nickel salts |
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| Authors: | Yanwei Li Wenqiang Xu Zhiping Xie Lingzhi Zhang Jinhuan Yao |
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| Institution: | 1.Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, College of Chemistry and Bioengineering,Guilin University of Technology,Guilin,China;2.Key Laboratory of Renewable Energy,Chinese Academy of Sciences,Guangzhou,China;3.Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi,Guilin University of Technology,Guilin,China |
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| Abstract: | Nickel hydroxides with hierarchical micro-nano structures are prepared by a facile homogeneous precipitation method with different nickel salts (Ni(NO3)2·6H2O, NiCl2·6H2O, and NiSO4·6H2O) as raw materials. The effect of nickel sources on the microstructure and lithium storage performance of the nickel hydroxides is studied. It is found that all the three prepared samples are α-nickel hydroxide. The nickel hydroxides synthesized with Ni(NO3)2·6H2 or NiCl2·6H2O show a similar particle size of 20–30 μm and are composed of very thin nano-sheets, while the nickel hydroxide synthesized with Ni(SO4)2·6H2O shows a larger particle size (30–50 μm) and consists of very thin nano-walls. When applied as anode materials for lithium-ion batteries (LIBs), the nickel hydroxide synthesized with NiSO4·6H2O exhibits the highest discharge capacity, but its cyclic stability is very poor. The nickel hydroxides synthesized with NiCl2·6H2O exhibit higher discharge capacity than the nickel hydroxides synthesized with Ni(NO3)2·6H2O, and both of them show much improved cyclic stability and rate capability as compared to the nickel hydroxide synthesized with Ni(SO4)2·6H2O. Moreover, pseudocapacitive behavior makes a great contribution to the electrochemical energy storage of the three samples. The discrepancies of lithium storage performance of the three samples are analyzed by ex-situ XRD, FT-IR, electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV) tests. |
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