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Surface Doping to Enhance Structural Integrity and Performance of Li‐Rich Layered Oxide
Author(s) -
Liu Shuai,
Liu Zepeng,
Shen Xi,
Li Weihan,
Gao Yurui,
Banis Mohammad Norouzi,
Li Minsi,
Chen Kai,
Zhu Liang,
Yu Richeng,
Wang Zhaoxiang,
Sun Xueliang,
Lu Gang,
Kong Qingyu,
Bai Xuedong,
Chen Liquan
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201802105
Subject(s) - materials science , oxide , cathode , doping , niobium oxide , chemical engineering , ion , oxygen , layer (electronics) , surface layer , structural stability , nanotechnology , inorganic chemistry , chemistry , optoelectronics , metallurgy , physics , organic chemistry , quantum mechanics , structural engineering , engineering
The Li‐rich layer‐structured oxides are regarded as one of the most promising cathode materials for their high energy density but suffer from severe problems such as capacity fading, poor rate performance, and continuous potential dropping. These issues are addressed here by surface doping of niobium (Nb) and other heavy ions in a Li‐rich Mn‐based layered oxide, Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 . The doped ions are verified to be located in the Li‐layer near the oxide surface; they bind the slabs via the strong NbO bonds and “inactivate” the surface oxygen, enhancing the structural stability. The specific capacity of the modified oxide reaches 320 mAh g −1 in the initial cycle, 94.5% of which remains after 100 cycles. More importantly, the average discharge potential drops only by 136 mV in this process. The findings of this study illustrate the importance of inactivating the surface oxygen in suppressing the cation mixing in the bulk, providing an effective strategy for designing high‐performance Li‐rich cathode materials.