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Browsing Articles by Author "Bakenov, Z."

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    A new step in the development of Zn/LiFePO4 aqueous battery
    (2017-01-01) Molkenova, A.; Belgibayeva, A.; Ibrayeva, D.; Sultanov, M.; Zhumagali, S.; Akhmetova, N.; Hara, T.; Bakenov, Z.; A., Molkenova
    Abstract In recent years, aqueous batteries have gained much attention due to their low production cost and exceptional safety compared to commercial Li-ion battery systems. Three-dimensional (3D) structure could be promising to enhance these batteries energy capacity. In this work, the electrochemical performance of 3D Zn electrode, developed for aqueous rechargeable Zn/LiFePO4 (Zn/LFP) battery system, was studied. Formation of uniformly coated Zn metal on the three-dimensionally organized carbon fibers was verified by field emission scanning electron microscopy (FE-SEM). The electrochemical performance of the battery with this anode was tested for over 50 cycles, where the initial capacity decayed by 11%. Further, poly(methyl methacrylate) (PMMA) and poly(p-phenylene oxide) (PPO) polymer coatings were extensively investigated as a potential separator for the 3D aqueous battery system. Cyclability of PMMA-coated Zn anode was better than that of “plane” Zn; however, the initial capacity of 3D Zn anode was lower than that for the counterpart system.
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    Electrodeposited Ni-Sn intermetallic alloy electrode for 3D sulfur battery
    (2017-01-01) Tolegen, B.; Adi, A.; Aishova, A.; Bakenov, Z.; Nurpeissova, A.; B., Tolegen
    Abstract 3D architecture appeared to be a promising design to enhance the performance of the Lithium-ion batteries by shortening the lithium ion diffusion path and increasing the energy density per unit area. In this paper, we report preliminary results of facile electrodeposition of intermetallic tin-nickel alloy from electrolyte solution onto 3D structured nickel foam for 3D lithium-sulfur battery. The coated films were characterized for their morphologies, structural and electrochemical properties. Scanning electron microscope images revealedthin and homogenous film while XRD revealed the expected phase of intermetallic alloy Ni3Sn4. The electrochemical activity of the film showed to be a promising start to be used as an anode material and needs further works to be optimized.