Dataset Information

Formation of toroidal Li₂O₂ in non-aqueous Li-O₂ batteries with Mo₂CT _x MXene/CNT composite.

ABSTRACT: Due to the growing demand for high energy density devices, Li-O₂ batteries are considered as a next generation energy storage system. The battery performance is highly dependent on the Li₂O₂ morphology, which arises from formation pathways such as the surface growth and the solution growth models. Thus, controlling the formation pathway is important in designing cathode materials. Herein for the first time, we controlled the Li₂O₂ formation pathway by using Mo₂CT _x MXene on a catalyst support. The cathode was fabricated by mixing the positively charged CNT/CTAB solution with the negatively charged Mo₂CT _x solution. After introducing Mo₂CT _x , important battery performance metrics were considerably enhanced. More importantly, the discharge product analysis showed that the functional groups on the surface of Mo₂CT _x inhibit the adsorption of O₂ on the cathode surface, resulting in the formation of toroidal Li₂O₂ via the solution growth model. It was supported by density functional theory (DFT) calculations that adsorption of O₂ on the Mo₂CT _x surface is implausible due to the large energy penalty for the O₂ adsorption. Therefore, the introduction of MXene with abundant functional groups to the cathode surface can provide a cathode design strategy and can be considered as a universal method in generating toroidal Li₂O₂ morphology.

SUBMITTER: Wu M

PROVIDER: S-EPMC9076372 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature

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Formation of toroidal Li2O2 in non-aqueous Li-O2 batteries with Mo2CT x MXene/CNT composite.

Wu Mihye M Kim Do Youb DY Park Hyunsoo H Cho Kyeong Min KM Kim Ju Ye JY Kim Seon Joon SJ Choi Sungho S Kang Yongku Y Kim Jihan J Jung Hee-Tae HT

RSC advances 20191216 70

Due to the growing demand for high energy density devices, Li-O2 batteries are considered as a next generation energy storage system. The battery performance is highly dependent on the Li2O2 morphology, which arises from formation pathways such as the surface growth and the solution growth models. Thus, controlling the formation pathway is important in designing cathode materials. Herein for the first time, we controlled the Li2O2 formation ...[more]

PMID: 35540088

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Project description:A SnO2/Ni/CNT nanocomposite was synthesized using a simple one-step hydrothermal method followed by calcination. A structural study via XRD shows that the tetragonal rutile structure of SnO2 is maintained. Further, X-ray photoelectron spectroscopy (XPS) and Raman studies confirm the existence of SnO2 along with CNTs and Ni nanoparticles. The electrochemical performance was investigated via cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge measurements. The nanocomposite has been used as an anode material for lithium-ion batteries. The SnO2/Ni/CNT nanocomposite exhibited an initial discharge capacity of 5312 mA h g-1 and a corresponding charge capacity of 2267 mA h g-1 during the first cycle at 50 mA g-1. Pristine SnO2 showed a discharge/charge capacity of 1445/636 mA h g-1 during the first cycle at 50 mA g-1. This clearly shows the effects of the optimum concentrations of CNTs and Ni. Further, the nanocomposite (SnNiCn) shows a discharge capacity as high as 919 mA h g-1 after 210 cycles at a current density of 400 mA g-1 in a Li-ion battery set-up. Thus, the obtained capacity from the nanocomposite is much higher compared to pristine SnO2. The higher capacity in the nanoheterostructure is due to the well-dispersed nanosized Ni-decorated stabilized SnO2 along with the CNTs, avoiding pulverization as a result of the volumetric change of the nanoparticles being minimized. The material accommodates huge volume expansion and avoids the agglomeration of nanoparticles during the lithiation and delithiation processes. The Ni nanoparticles can successfully inhibit Sn coarsening during cycling, resulting in the enhancement of stability during reversible conversion reactions. They ultimately enhance the capacity, giving stability to the nanocomposite and improving performance. Additionally, the material exhibits a lower Warburg coefficient and higher Li ion diffusion coefficient, which in turn accelerate the interfacial charge transfer process; this is also responsible for the enhanced stable electrochemical performance. A detailed mechanism is expressed and elaborated on to provide a better understanding of the enhanced electrochemical performance.

Dataset Information

Formation of toroidal Li₂O₂ in non-aqueous Li-O₂ batteries with Mo₂CT _x MXene/CNT composite.

Publications

Formation of toroidal Li<sub>2</sub>O<sub>2</sub> in non-aqueous Li-O<sub>2</sub> batteries with Mo<sub>2</sub>CT <sub><i>x</i></sub> MXene/CNT composite.

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