Stabilizing ultrahigh-nickel layered oxide cathodes for high-voltage lithium metal batteries. (April 2021)

• Record Type: Journal Article
• Authors: 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; Xu, Wu
• Is Part Of: Materials today. Volume 44(2021)
• Page Start: 15
• Page End: 24
• Publication Date: 2021-04
• Subjects: Materials science -- Periodicals; Metallurgy -- Periodicals; Metal-work -- Periodicals; Biomedical and Dental Materials -- Periodicals; Manufactured Materials -- Periodicals; Metals -- Periodicals; 620.11
• DOI: 10.1016/j.mattod.2021.01.013
• Languages: English
• ISSNs: 1369-7021

Abstract

Graphical abstract: Abstract: 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 LiNi0.94 Co0.06 O2 (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.