%0 Journal Article
%A Kehua Dai
%A Jing Mao
%A Zengqing Zhuo
%A Yan Feng
%A Wenfeng Mao
%A Guo Ai
%A Feng Pan
%A Yi-den Chuang
%A Gao Liu
%A Wanli Yang
%B Nano Energy
%D 2020
%G eng
%P 104831
%R 10.1016/j.nanoen.2020.104831
%T Negligible voltage hysteresis with strong anionic redox in conventional battery electrode
%V 74
%8 08/2020
%! Nano Energy
%X <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>