TY - JOUR
AU - Kehua Dai
AU - Jing Mao
AU - Zengqing Zhuo
AU - Yan Feng
AU - Wenfeng Mao
AU - Guo Ai
AU - Feng Pan
AU - Yi-den Chuang
AU - Gao Liu
AU - Wanli Yang
AB - <p><span>Lattice anionic (oxygen) redox reactions (ARR) offers opportunities for developing high-capacity batteries, however, often suffers the notoriously high hysteresis in voltages and low initial coulombic efficiency. Particularly, ARR was widely considered inherent to these kinetic issues. In this paper, unambiguous evidences of strong and reversible ARR is found in Na</span><sub><span>2/3</span></sub><span>Ni</span><sub><span>1/3</span></sub><span>Mn</span><sub><span>2/3</span></sub><span>O</span><sub><span>2</span></sub><span>&nbsp;through mapping of resonant inelastic X-ray scattering (mRIXS). Strikingly, the material displays negligible voltage hysteresis (0.1&nbsp;V) and high initial coulombic efficiency with a highly stable electrochemical profile. Our independent analysis of the Ni, Mn and O states consistently interpret the redox mechanism of Na</span><sub><span>2/3</span></sub><span>Ni</span><sub><span>1/3</span></sub><span>Mn</span><sub><span>2/3</span></sub><span>O</span><sub><span>2</span></sub><span>, which reveals a strong ARR system with facile kinetics and highly stable electrochemical profile that previously found only in cationic redox systems of conventional non-Alkali-rich materials.</span></p>
BT - Nano Energy
DA - 08/2020
DO - 10.1016/j.nanoen.2020.104831
LA - eng
N2 - <p><span>Lattice anionic (oxygen) redox reactions (ARR) offers opportunities for developing high-capacity batteries, however, often suffers the notoriously high hysteresis in voltages and low initial coulombic efficiency. Particularly, ARR was widely considered inherent to these kinetic issues. In this paper, unambiguous evidences of strong and reversible ARR is found in Na</span><sub><span>2/3</span></sub><span>Ni</span><sub><span>1/3</span></sub><span>Mn</span><sub><span>2/3</span></sub><span>O</span><sub><span>2</span></sub><span>&nbsp;through mapping of resonant inelastic X-ray scattering (mRIXS). Strikingly, the material displays negligible voltage hysteresis (0.1&nbsp;V) and high initial coulombic efficiency with a highly stable electrochemical profile. Our independent analysis of the Ni, Mn and O states consistently interpret the redox mechanism of Na</span><sub><span>2/3</span></sub><span>Ni</span><sub><span>1/3</span></sub><span>Mn</span><sub><span>2/3</span></sub><span>O</span><sub><span>2</span></sub><span>, which reveals a strong ARR system with facile kinetics and highly stable electrochemical profile that previously found only in cationic redox systems of conventional non-Alkali-rich materials.</span></p>
PY - 2020
EP - 104831
ST - Nano Energy
T2 - Nano Energy
TI - Negligible voltage hysteresis with strong anionic redox in conventional battery electrode
VL - 74
SN - 22112855
ER -