Two-dimensional IrO2/MnO2 enabling conformal growth of amorphous Li2O2 for high-performance Li–O2 batteries
Two-dimensional IrO2/MnO2 enabling conformal growth of amorphous Li2O2 for high-performance Li–O2 batteries
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二维 IrO2/MnO2 可实现非晶态 Li2O2 的共形生长,用于高性能 Li-O2 电池
DOI:
10.1016/j.ensm.2017.07.016
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发表时间:
2017-10
期刊:
影响因子:
--
通讯作者:
X.B. Zhao
中科院分区:
文献类型:
--
作者:
C. Tang;P.C. Sun;J. Xie;Z.C. Tang;Z.X. Yang;Z.X. Dong;G.S. Cao;S.C. Zhang;P.V. Braun;X.B. Zhao
Li–O2cells have attracted a worldwide attention due to their extremely high energy density compared with current Li-ion batteries. However, great challenges must to be overcome to realize full charge and discharge of Li–O2cells at high rates over a wide electrochemical window. Herein, we propose a unique design of binder-free catalytic cathode composed of two-dimensional (2D), few-layered δ-MnO2(5–10 nm) decorated with small-sized IrO2(around 5 nm). The superior catalytic activity of IrO2/MnO2enables conformal growth of amorphous Li2O2on the 2D IrO2/MnO2nanosheets at high current density, leading to significantly enhanced Li2O2formation/decomposition kinetics. As a result, Li–O2cells with the IrO2/MnO2catalyst exhibit high capacity (16370 mAh g−1at 200 mA g−1), superior rate capability (2315 mAh g−1at 1600 mA g−1) and high-rate cycling stability (312 cycles at 1600 mA g−1) between 2.2 and 4.3 V. Even over a wider voltage window of 2–4.4 V, the cell can sustain 247 cycles at 1600 mA g−1in a full charge/discharge mode. The superior catalytic activity of IrO2/MnO2makes it a promising catalyst for high-performance Li–O2cells.
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