Open AccessUnblocking Oxygen Charge Compensation for Stabilized High‐Voltage Structure in P2‐Type Sodium‐Ion Cathode
Author(s) -
Zhu He,
Yao Zhenpeng,
Zhu Hekang,
Huang Yalan,
Zhang Jian,
Li Cheng Chao,
Wiaderek Kamila M.,
Ren Yang,
Sun ChengJun,
Zhou Hua,
Fan Longlong,
Chen Yanan,
Xia Hui,
Gu Lin,
Lan Si,
Liu Qi
Publication year - 2022
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202200498
Subject(s) - cathode , electrochemistry , materials science , ion , battery (electricity) , sodium ion battery , charge ordering , voltage , sodium , nanotechnology , covalent bond , chemical physics , chemical engineering , charge (physics) , electrode , chemistry , electrical engineering , thermodynamics , power (physics) , physics , organic chemistry , faraday efficiency , quantum mechanics , metallurgy , engineering
Layered transition‐metal (TM) oxides are ideal hosts for Li + charge carriers largely due to the occurrence of oxygen charge compensation that stabilizes the layered structure at high voltage. Hence, enabling charge compensation in sodium layered oxides is a fascinating task for extending the cycle life of sodium‐ion batteries. Herein a Ti/Mg co‐doping strategy for a model P2‐Na 2/3 Ni 1/3 Mn 2/3 O 2 cathode material is put forward to activate charge compensation through highly hybridized O 2 p TM 3 d covalent bonds. In this way, the interlayer OO electrostatic repulsion is weakened upon deeply charging, which strongly affects the systematic total energy that transforms the striking P2–O2 interlayer contraction into a moderate solid‐solution‐type evolution. Accordingly, the cycling stability of the codoped cathode material is improved superiorly over the pristine sample. This study starts a perspective way of optimizing the sodium layered cathodes by rational structural design coupling electrochemical reactions, which can be extended to widespread battery researches.