Biocarbon-directed vertical δ-MnO2 nanoflakes for boosting lithium-ion diffusion kinetics
نویسندگان
چکیده
Manganese dioxide (MnO2) with high theoretical capacity (1230 mAh/g) and low cost is considered as a promising anode material for next generation energy density lithium-ion (Li+) batteries. However, the intrinsic electric conductivity volume change during cycling process limit its applications. In this work, unique δ-MnO2/C composite has been synthesized through directed growth of 2D δ-MnO2 nanosheets on cabbage-leaf-derived biocarbon. The biocarbon acts both structure buffer to accommodate expansion conductive agent promote electron ion transport. Moreover, oriented are beneficial increasing contact area between electrode electrolyte, thus providing more active sites shortening Li+ transmission routes. Electrochemical performances show that displays large reversible (754 mAh/g after 250 cycles at current 0.1 A/g), excellent rate capability well charge transfer resistance (17.3 Ω), diffusion (DLi+ = 2.91 × 10-14 cm2/s) cycles. Furthermore, functional theory calculations reveal lower migration barrier energies improved kinetics in hetero-layer. This study provides novel strategy design advanced nanocomposites, using natural plant-leaf derivatives structure-directing agents, storage conversion systems.
منابع مشابه
A nanoporous metal recuperated MnO2 anode for lithium ion batteries.
Lithium-ion batteries (LIBs) have been intensively studied to meet the increased demands for the high energy density of portable electronics and electric vehicles. The low specific capacity of the conventional graphite based anodes is one of the key factors that limit the capacity of LIBs. Transition metal oxides, such as NiO, MnO2 and Fe3O4, are known to be promising anode materials that are e...
متن کاملBeads-Milling of Waste Si Sawdust into High-Performance Nanoflakes for Lithium-Ion Batteries
Nowadays, ca. 176,640 tons/year of silicon (Si) (>4N) is manufactured for Si wafers used for semiconductor industry. The production of the highly pure Si wafers inevitably includes very high-temperature steps at 1400-2000 °C, which is energy-consuming and environmentally unfriendly. Inefficiently, ca. 45-55% of such costly Si is lost simply as sawdust in the cutting process. In this work, we de...
متن کاملMnO2 prepared by hydrothermal method and electrochemical performance as anode for lithium-ion battery
Two α-MnO2 crystals with caddice-clew-like and urchin-like morphologies are prepared by the hydrothermal method, and their structure and electrochemical performance are characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), galvanostatic cell cycling, cyclic voltammetry, and electrochemical impedance spectroscopy (EIS). The morphology of the MnO2 prepared under acidic con...
متن کاملPseudocapacitive performance of vertical copper oxide nanoflakes
Available online 6 November 2012
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Materials Today Chemistry
سال: 2022
ISSN: ['2468-5194']
DOI: https://doi.org/10.1016/j.mtchem.2022.101023