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Pseudo‐Bonding and Electric‐Field Harmony for Li‐Rich Mn‐Based Oxide Cathode
Author(s) -
Chen Jun,
Zou Guoqiang,
Deng Wentao,
Huang Zhaodong,
Gao Xu,
Liu Cheng,
Yin Shouyi,
Liu Huanqing,
Deng Xinglan,
Tian Ye,
Li Jiayang,
Wang Chiwei,
Wang Di,
Wu Hanwen,
Yang Li,
Hou Hongshuai,
Ji Xiaobo
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202004302
Subject(s) - materials science , cathode , spinel , electrolyte , oxide , chemical physics , electric field , chemical engineering , oxygen , oxygen evolution , electrode , electrochemistry , chemistry , physics , quantum mechanics , engineering , metallurgy , organic chemistry
The practical application of Li‐rich Mn‐based oxide cathode is predominately retarded by the capacity decline and voltage fading, associated with the structure distortion and anionic redox reactions. Here, a linkage‐functionalized modification approach to tackle these challenges via a synchronous lithium oxidation strategy is reported. The doping of Ce in the bulk phase activates the pseudo‐bonding effect, effectively stabilizing the lattice oxygen evolution and suppressing the structure distortion. Interestingly, it also induces the formation of spinel phase Li 4 Mn 5 O 12 in the subsurface, which in turn constructs the phase boundaries, thereby arousing the interior self‐built‐in electric field to prevent the outward migration of bulk oxygen anions and boost the charge transfer. Moreover, the formed coating layer Li 2 CeO 3 with oxygen vacancies accelerates Li + diffusion and mitigates electrolyte cauterization. The corresponding cathode exhibits superior long‐cycle stability after 300 cycles with only a 0.013% capacity drop and 1.76 mV voltage decay per cycle. This work sheds new light on the development of Li‐rich Mn‐based oxide cathodes toward high energy density applications.