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Insight of a Phase Compatible Surface Coating for Long‐Durable Li‐Rich Layered Oxide Cathode
Author(s) -
Hu Sijiang,
Li Yu,
Chen Yuhua,
Peng Jiming,
Zhou Tengfei,
Pang Wei Kong,
Didier Christophe,
Peterson Vanessa K.,
Wang Hongqiang,
Li Qingyu,
Guo Zaiping
Publication year - 2019
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.201901795
Subject(s) - materials science , cathode , coating , chemical engineering , oxide , electrode , degradation (telecommunications) , lithium (medication) , phase (matter) , ion , energy storage , composite material , metallurgy , medicine , telecommunications , power (physics) , chemistry , physics , organic chemistry , quantum mechanics , computer science , engineering , endocrinology
Li‐rich layered oxides (LLOs) can deliver almost double the capacity of conventional electrode materials such as LiCoO 2 and LiMn 2 O 4 ; however, voltage fade and capacity degradation are major obstacles to the practical implementation of LLOs in high‐energy lithium‐ion batteries. Herein, hexagonal La 0.8 Sr 0.2 MnO 3− y (LSM) is used as a protective and phase‐compatible surface layer to stabilize the Li‐rich layered Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 (LM) cathode material. The LSM is MnO M bonded at the LSM/LM interface and functions by preventing the migration of metal ions in the LM associated with capacity degradation as well as enhancing the electrical transfer and ionic conductivity at the interface. The LSM‐coated LM delivers an enhanced reversible capacity of 202 mAh g −1 at 1 C (260 mA g −1 ) with excellent cycling stability and rate capability (94% capacity retention after 200 cycles and 144 mAh g −1 at 5 C). This work demonstrates that interfacial bonding between coating and bulk material is a successful strategy for the modification of LLO electrodes for the next‐generation of high‐energy Li‐ion batteries.