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High Voltage Operation of Ni‐Rich NMC Cathodes Enabled by Stable Electrode/Electrolyte Interphases
Author(s) -
Zhao Wengao,
Zheng Jianming,
Zou Lianfeng,
Jia Haiping,
Liu Bin,
Wang Hui,
Engelhard Mark H.,
Wang Chongmin,
Xu Wu,
Yang Yong,
Zhang JiGuang
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.201800297
Subject(s) - materials science , electrolyte , anode , cathode , electrochemistry , ethylene carbonate , battery (electricity) , electrode , lithium (medication) , chemical engineering , inorganic chemistry , chemistry , physics , quantum mechanics , engineering , endocrinology , medicine , power (physics)
The lithium (Li) metal battery (LMB) is one of the most promising candidates for next‐generation energy storage systems. However, it is still a significant challenge to operate LMBs with high voltage cathodes under high rate conditions. In this work, an LMB using a nickel‐rich layered cathode of LiNi 0.76 Mn 0.14 Co 0.10 O 2 (NMC76) and an optimized electrolyte [0.6 m lithium bis(trifluoromethanesulfonyl)imide + 0.4 m lithium bis(oxalato)borate + 0.05 m LiPF 6 dissolved in ethylene carbonate and ethyl methyl carbonate (4:6 by weight)] demonstrates excellent stability at a high charge cutoff voltage of 4.5 V. Remarkably, these Li||NMC76 cells can deliver a high discharge capacity of >220 mA h g −1 (846 W h kg −1 ) and retain more than 80% capacity after 1000 cycles at high charge/discharge current rates of 2C/2C (1C = 200 mA g −1 ). This excellent electrochemical performance can be attributed to the greatly enhanced structural/interfacial stability of both the Ni‐rich NMC76 cathode material and the Li metal anode using the optimized electrolyte.