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Simultaneously Dual Modification of Ni‐Rich Layered Oxide Cathode for High‐Energy Lithium‐Ion Batteries
Author(s) -
Yang Huiping,
Wu HongHui,
Ge Mingyuan,
Li Lingjun,
Yuan Yifei,
Yao Qi,
Chen Jie,
Xia Lingfeng,
Zheng Jiangming,
Chen Zhaoyong,
Duan Junfei,
Kisslinger Kim,
Zeng Xiao Cheng,
Lee WahKeat,
Zhang Qiaobao,
Lu Jun
Publication year - 2019
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.201808825
Subject(s) - materials science , cathode , surface modification , lithium (medication) , degradation (telecommunications) , electrochemistry , oxide , chemical engineering , nanotechnology , metallurgy , electrode , electronic engineering , electrical engineering , medicine , chemistry , engineering , endocrinology
Abstract A critical challenge in the commercialization of layer‐structured Ni‐rich materials is the fast capacity drop and voltage fading due to the interfacial instability and bulk structural degradation of the cathodes during battery operation. Herein, with the guidance of theoretical calculations of migration energy difference between La and Ti from the surface to the inside of LiNi 0.8 Co 0.1 Mn 0.1 O 2 , for the first time, Ti‐doped and La 4 NiLiO 8 ‐coated LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathodes are rationally designed and prepared, via a simple and convenient dual‐modification strategy of synchronous synthesis and in situ modification. Impressively, the dual modified materials show remarkably improved electrochemical performance and largely suppressed voltage fading, even under exertive operational conditions at elevated temperature and under extended cutoff voltage. Further studies reveal that the nanoscale structural degradation on material surfaces and the appearance of intergranular cracks associated with the inconsistent evolution of structural degradation at the particle level can be effectively suppressed by the synergetic effect of the conductive La 4 NiLiO 8 coating layer and the strong TiO bond. The present work demonstrates that our strategy can simultaneously address the two issues with respect to interfacial instability and bulk structural degradation, and it represents a significant progress in the development of advanced cathode materials for high‐performance lithium‐ion batteries.