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Nanoscale Surface Modification of Lithium‐Rich Layered‐Oxide Composite Cathodes for Suppressing Voltage Fade
Author(s) -
Zheng Fenghua,
Yang Chenghao,
Xiong Xunhui,
Xiong Jiawen,
Hu Renzong,
Chen Yu,
Liu Meilin
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201506408
Subject(s) - materials science , cathode , lithium (medication) , electrolyte , fade , coating , nanoscopic scale , oxide , composite number , surface modification , doping , nanotechnology , ion , chemical engineering , optoelectronics , composite material , electrode , electrical engineering , chemistry , metallurgy , medicine , organic chemistry , endocrinology , computer science , engineering , operating system
Lithium‐rich layered oxides are promising cathode materials for lithium‐ion batteries and exhibit a high reversible capacity exceeding 250 mAh g −1 . However, voltage fade is the major problem that needs to be overcome before they can find practical applications. Here, Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 (LLMO) oxides are subjected to nanoscale LiFePO 4 (LFP) surface modification. The resulting materials combine the advantages of both bulk doping and surface coating as the LLMO crystal structure is stabilized through cationic doping, and the LLMO cathode materials are protected from corrosion induced by organic electrolytes. An LLMO cathode modified with 5 wt % LFP (LLMO–LFP5) demonstrated suppressed voltage fade and a discharge capacity of 282.8 mAh g −1 at 0.1 C with a capacity retention of 98.1 % after 120 cycles. Moreover, the nanoscale LFP layers incorporated into the LLMO surfaces can effectively maintain the lithium‐ion and charge transport channels, and the LLMO–LFP5 cathode demonstrated an excellent rate capacity.