Premium
A Hydrostable Cathode Material Based on the Layered P2@P3 Composite that Shows Redox Behavior for Copper in High‐Rate and Long‐Cycling Sodium‐Ion Batteries
Author(s) -
Yan Zichao,
Tang Liang,
Huang Yangyang,
Hua Weibo,
Wang Yong,
Liu Rong,
Gu Qinfen,
Indris Sylvio,
Chou ShuLei,
Huang Yunhui,
Wu Minghong,
Dou ShiXue
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201811882
Subject(s) - cathode , electrochemistry , redox , copper , materials science , ion , chemical engineering , sodium ion battery , phase (matter) , composite number , sodium , synchrotron , ionic bonding , chemistry , inorganic chemistry , electrode , metallurgy , composite material , organic chemistry , engineering , physics , faraday efficiency , nuclear physics
Low‐cost layered oxides free of Ni and Co are considered to be the most promising cathode materials for future sodium‐ion batteries. Biphasic Na 0.78 Cu 0.27 Zn 0.06 Mn 0.67 O 2 obtained via superficial atomic‐scale P3 intergrowth with P2 phase induced by Zn doping, consisting of inexpensive transition metals, is a promising cathode for sodium‐ion batteries. The P3 phase as a covering layer in this composite shows not only in excellent electrochemical performance but also its tolerance to moisture. The results indicate that partial Zn substitutes can effectively control biphase formation for improving the structural/electrochemical stability as well as the ionic diffusion coefficient. Based on in situ synchrotron X‐ray diffraction coupled with electron‐energy‐loss spectroscopy, a possible Cu 2+/3+ redox reaction mechanism has now been revealed.