1. Stabilizing ultrahigh-nickel layered oxide cathodes for high-voltage lithium metal batteries.
- Author
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Zhang, Xianhui, Zou, Lianfeng, Cui, Zehao, Jia, Hao, Engelhard, Mark H., Matthews, Bethany E., Cao, Xia, Xie, Qiang, Wang, Chongmin, Manthiram, Arumugam, Zhang, Ji-Guang, and Xu, Wu
- Subjects
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LITHIUM cells , *CATHODES , *ELECTROLYTES , *OXIDES , *ELECTRODES - Abstract
[Display omitted] Rechargeable lithium (Li) metal batteries (LMBs) with ultrahigh-nickel (Ni) layered oxide cathodes offer a great opportunity for applications in electrical vehicles. However, increasing Ni content inherently arouses a tradeoff between specific capacity and electrochemical cyclability due to the aggressive side reactions with electrolyte contributed by the highly reactive Ni species. Here, a protective and stable cathode/electrolyte interphase featuring enriched and evenly-distributed LiF is in situ formed on ultrahigh-Ni cathode LiNi 0.94 Co 0.06 O 2 (NC) with an advanced ether-based localized high-concentration electrolyte (LHCE), which concurrently shows good compatibility with Li metal anode. Subsequently, the NC cathode can deliver high capacity retentions of 81.4% after 500 cycles at 25 °C and 91.6% after 100 cycles at 60 °C in the voltage range of 2.8–4.4 V in Li||NC cells at 1C cycling rate (1.5 mA cm−2). Meanwhile, the conductive electrode/electrolyte interphases formed in LHCE enable a high reversible capacity of about 209 mAh g−1 at 3C charging rate. This work provides an effective approach and important insight from the perspective of in situ ultrahigh-Ni cathode/electrolyte interphase protection for high energy–density, long-lasting LMBs. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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