Two-dimensional IrO2/MnO2 enabling conformal growth of amorphous Li2O2 for high-performance Li–O2 batteries

Cong Tang, Pengcheng Sun, Jian Xie, Zhichu Tang, Zixu Yang, Zexi Dong, Gaoshao Cao, Shichao Zhang, Paul V. Braun, Xinbing Zhao

Research output: Contribution to journalArticlepeer-review

Abstract

Li–O2 cells 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–O2 cells 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/MnO2 enables conformal growth of amorphous Li2O2 on the 2D IrO2/MnO2 nanosheets at high current density, leading to significantly enhanced Li2O2 formation/decomposition kinetics. As a result, Li–O2 cells with the IrO2/MnO2 catalyst exhibit high capacity (16370 mAh g−1 at 200 mA g−1), superior rate capability (2315 mAh g−1 at 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−1 in a full charge/discharge mode. The superior catalytic activity of IrO2/MnO2 makes it a promising catalyst for high-performance Li–O2 cells.

Original languageEnglish (US)
Pages (from-to)206-213
Number of pages8
JournalEnergy Storage Materials
Volume9
DOIs
StatePublished - Oct 2017

Keywords

  • Amorphous LiO
  • Conformal growth
  • IrO nanoparticle
  • Li–O cell
  • MnO nanosheet

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Energy Engineering and Power Technology

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