Browsing by Author "Gopukumar, S"

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    CATHODE MATERIAL AND LITHIUM ION BATTERIES MADE THEREFROM
    (2011) Dr Nithya, C; Gopukumar, S; Thirunakaran, R; Sivashanmugam, A; Maheswari, P H; Mathur, R B; Dhawan, S K
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    HIGH CAPACITY SNXSBYCUZ COMPOSITE ANODES FOR LITHIUM ION BATTERIES
    (Elsevier, 2013-05) Nithya, C; Sowmiya, T; Vijaya Baskar, K; Selvaganeshan, N; Kalaiyarasi, T; Gopukumar, S
    To increase the volumetric discharge capacity of negative electrode for rechargeable lithium batteries, a composite anode SnxSbyCuz has been synthesized by using high energy mechanical ball milling method. The synthesized composite anode materials have been characterized by X-ray diffraction and SEM analysis. The charge/discharge characteristics of the fabricated coin cells have been evaluated galvanostatically in the potential range 0.01–2 V using 1 M LiPF6 in 1:1 EC/DEC as electrolyte. Results indicate that the composition with 90 wt% Sn, 8 wt% Sb and 2 wt% Cu delivers an average discharge capacity of 740 mAh g−1 over the investigated 50 cycles which is a potential candidate for use as an anode material for lithium rechargeable cells.
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    THE METHOD FOR PREPARING LITHIUM ION BATTERY PACK OF HIGH VOLTAGE NANOCOMPOSITE CATHODE
    (2011) Dr Nithya, C; Gopukumar, S; Thirunakaran, R; Sivashanmugam, A
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    NANOSTRUCTURED TRANSITION METAL CHALCOGENIDES FOR RECHARGEABLE BATTERIES
    (Elsevier, 2020) Nithya, C; Gopukumar, S
    Rechargeable lithium/sodium-ion batteries and emerging potassium-ion batteries are considered as the promising energy storage devices for potential high-current rate applications. It has been considered that transition metal chalcogenides (mono- and di-) are a class of two-dimensional compounds (metal sulfides and metal selenides) attracting growing research interest as an anode materials for rechargeable batteries. They have shown efficient energy storage properties owing to their unique physiochemical properties. In this chapter, we systematically discussed and summarized the recent research progress on the nanostructured transition metal chalcogenides (TMCs) for LIBs, NIBs, and KIBs. Here, we presented the electrochemical reaction kinetics, challenging issues, and effective strategies toward the improvement of TMCs for rechargeable batteries. To the end the remaining challenges and outlooks for the further development of TMCs in the field of rechargeable batteries are proposed.
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    PROCESS FOR THE PREPARATION OF HIGH VOLTAGE NANO COMPOSITE CATHODE (4.9 V) FOR LITHIUM ION BATTERIES
    (2013) Dr Nithya, C; Gopukumar, S; Thirunakaran, R; Sivashanmugam, A
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    PROCESS FOR THE PREPARATION OF HIGH VOLTAGE NANO COMPOSITE CATHODE (4.9 V) FOR LITHIUM ION BATTERIES
    (2011) Dr Nithya, C; Gopukumar, S; Thirunakaran, R; Sivashanmugam, A
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    PROCESS FOR THE PREPARATION OF HIGH VOLTAGE NANO COMPOSITE CATHODE (4.9 V) FOR LITHIUM ION BATTERIES
    (2017) Dr Nithya, C; Gopukumar, S; Thirunakaran, R; Sivashanmugam, A
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    SODIUM ION BATTERIES: A NEWER ELECTROCHEMICAL STORAGE
    (John Wiley & Sons, Inc, 2014-07-24) Nithya, C; Gopukumar, S
    Vehicle electrification is one of the most significant solutions that address the challenges of fossil fuel depletion, global warming, CO2 pollution, and so on. To mitigate these issues, recent research mainly focuses on finding clean energy storage devices such as batteries, supercapacitors, fuel cells, and so forth. Owing to the outstanding energy and power density, lithium-ion batteries (LIB) have captured the market for portable electronics, hybrid electric vehicles, plug-in hybrid electric vehicles, and so on. During 1970–1980s, electrode materials for both LIBs and sodium-ion batteries (NIBs) were investigated but higher energy and power density of LIBs have made it a popular candidate for portable electronics. Issues arise on the availability of lithium reserves, so it is high time we take a look at finding alternative energy storage system without compromising on the energy and power density of the state-of-the-art LIBs. Therefore, researchers have revisited NIBs and recent developments have contributed towards discovering new electrode materials to match the energy and power density of LIBs at low cost. While a variety of positive and negative electrode materials have been investigated for NIBs so far, the influence of voltage, capacity, cycle life, and volume expansion of negative electrodes on Na+ ion extraction and insertion are more as compared with LIBs. This affects the energy and power density of NIBs but cost-effective partial replacement of LIBs is viable and is widely pursued
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    THERMODYNAMIC ANALYSIS OF LITHIUM-ION BATTERY STORAGE SYSTEM
    (Elsevier, 2022) Nithya, C; Gopukumar, S
    The most promising energy storage systems are lithium-ion batteries (LIBs) owing to its high energy and power density. The electrochemical lithium storage in LIB is investigated in terms of thermodynamic functions such as free energy, entropy, enthalpy and heat capacities. These thermodynamic functions are influenced by various factors such as temperature, porosity, defects in electrode materials, solvation of Li+ ions by electrolyte solvents, double layer formation between electrode/electrolyte, phase transition during cycling and coexistence of Li intercalation reaction in single-phase and multiphase etc. Herein, we have analyzed the thermodynamics of overall electrochemical lithium storage and this analysis helpful to explore the stable electrode and electrolyte materials for next generation of LIBs and beyond.