Laboratory of advanced materials and systems for Energy storage

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https://testres.nu.edu.kz/handle/123456789/4975
Popularization of portable electronics, electric transport and intensive growth of ratio of renewable energy in grids worldwide stimulate the development of next generation energy storage devices, such as rechargeable batteries and supercapacitors, toward higher power and energy density, which significantly depends upon the advancement of new materials used in these devices. Moreover, energy storage materials play a key role in efficient, clean, and versatile use of energy, and are crucial for the exploitation of renewable energy. Therefore, the ultimate goal of the laboratory is to develop advanced energy storage materials, employing strategies as nanostructuring, nano/microcombination, hybridization, pore-structure control, configuration design, surface modification, and composition optimization.

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    BIOMASS-DERIVED POROUS CARBON FROM AGAR AS AN ANODE MATERIAL FOR LITHIUM-ION BATTERIES
    (MDPI, 2021-12-22) Issatayev, Nurbolat; Kalimuldina, Gulnur; Nurpeissova, Arailym; Bakenov, Zhumabay
    New porous activated carbons with a high surface area as an anode material for lithium-ion batteries (LIBs) were synthesized by a one-step, sustainable, and environmentally friendly method. Four chemical activators—H2SO4, H3PO4, KOH, and ZnCl2—have been investigated as facilitators of the formation of the porous structure of activated carbon (AC) from an agar precursor. The study of the materials by Brunauer–Emmett–Teller (BET) and scanning electron microscopy (SEM) methods revealed its highly porous meso- and macro-structure. Among the used chemical activators, the AC prepared with the addition of KOH demonstrated the best electrochemical performance upon its reaction with lithium metal. The initial discharge capacity reached 931 mAh g−1 and a reversible capacity of 320 mAh g−1 was maintained over 100 cycles at 0.1 C. High rate cycling tests up to 10 C demonstrated stable cycling performance of the AC from agar.
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    EVALUATING SULFUR-COMPOSITE CATHODE MATERIAL WITH LITHIATED GRAPHITE ANODE IN COIN CELL AND POUCH CELL CONFIGURATION
    (Frontiers Media, 2020-11-09) Uzakbaiuly, Berik; Mentbayeva, Almagul; Konarov, Aishuak; Kurmanbayeva, Indira; Zhang, Yongguang; Bakenov, Zhumabay
    High-performance sulfur-composite cathode material, sulfur/polyacrylonitrile/ketjen black, was prepared by simple mixing and low-temperature heat treatment route. The cell made of the composite cathode and anode from metallic lithium or lithiated graphite was assembled in coin cell configuration. Half-cells retained about 70% of their initial capacity of 1,270 mAh g−1 after 150 cycles, while full-cells retained about 85% of the initial capacity of 1,500 mAh g−1 for over 150 cycles. Since coin cells do not reflect the true performance of a practical cell, the cathode composite was assembled with lithiated graphite anode in a 45 × 85 × 6 mm3 pouch cell configuration. This cell retained about 81% of its initial capacity for over 100 cycles. At high cycling rates up to 1 C, the pouch cell demonstrated a moderate rate capability and exhibited good recovery and stable performance after high rate cycling. Also, the cell successfully passed safety tests such as overcharge, deep discharge, and mechanical short circuit tests.
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    Facile Synthesis of Binder-Free Three-Dimensional CuxS Nanoflowers for Lithium Batteries
    (Frontiers Media, 2020-07-16) Adylkhanova, Assyl; Nurpeissova, Arailym; Adair, Desmond; Bakenov, Zhumabay; Taniguchi, Izumi; Kalimuldina, Gulnur
    Copper sulfides (CuxS) with different stoichiometry are considered as prospective cathode materials for lithium batteries owing to their large energy storage capability. In this work, three-dimensional CuxS cathodes were synthesized via introducing commercially available copper foam into the solution of dimethyl sulfoxide (DMSO) and sulfur powder. The synthesis procedures were straightforward and ultrafast and did not require additional reagents, high temperature, or long processing time and can be considered as a facile one-step method. Copper sulfide materials with different stoichiometry (x = 1.8, 1.96) were obtained by changing the temperature and the residence time of the copper foam in the DMSO solution. The effects of the temperature and time on phase and morphology of CuxS were characterized by X-ray diffraction and scanning electron microscopy coupled with energy dispersive X-ray spectroscopy. Electrochemical tests resulted in a stable cyclability of Cu1.8S cathode with 100% Coulombic efficiency and capacity of approximately 250 mAh g–1.