Unlocking Stable Multi-Electron Cycling in NMC811 Thin-Films between 1.5 – 4.7 V

Abdessalem Aribia; Jordi Sastre; Xubin ChenMoritz H. FutscherMatthias RumpelAgnieszka PriebeMax DoebeliNicolas OsenciatAyodhya N. TiwariYaroslav E. Romanyuk

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Unlocking Stable Multi-Electron Cycling in NMC811 Thin-Films between 1.5 – 4.7 V

机译：Unlocking Stable Multi-Electron Cycling in NMC811 Thin-Films between 1.5 – 4.7 V

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Among cathode materials, LiNi_(0.8)Mn_(0.1)Co_(0.1)O_2 (NMC811) is the most discussedfor high performance Li-ion batteries, thanks to its capacity of ≈200 mAh g~(-1)and low Co content. Here, it is demonstrated that NMC811 can reversiblyaccommodate more than one Li-ion per formula unit when coupled with asolid-state electrolyte, thus significantly increasing its capacity. Sputtered Li-richNMC811 cathodes are tested with lithium–phosphorus–oxynitride as a solidstateelectrolyte in a thin-film architecture, which is a simplified 2D model withdirect access to the cathode-electrolyte interface. The solid-state electrolytehelps to stabilize the interface and prevents capacity fading, voltage decay, andinterface resistance growth, thus allowing cycling at extended voltage ranges of1.5–4.7 V. While the liquid electrolyte cells suffer from rapid capacity decay, theLi-rich NMC811 cells with the solid-state electrolyte can cycle at a fast rate andan initial capacity of 149 mAh g-1 from 1.5 to 4.3 V for 1000 cycles. The all-solidstatethin-film cells with a lithium metal anode yield a discharge capacity ofup to 350 mAh g~(-1) at C/10 because of multi-electron cycling with a coulombicefficiency of 90.1%. The results demonstrate how solid-state electrolytes thatare stable against NMC811 cathodes can unlock the full potential of this Li-richand Ni-rich cathode class.

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《Advanced energy materials》 |2022年第40期|2201750.1-2201750.8|共8页
作者
Abdessalem Aribia; Jordi Sastre; Xubin ChenMoritz H. FutscherMatthias RumpelAgnieszka PriebeMax DoebeliNicolas OsenciatAyodhya N. TiwariYaroslav E. Romanyuk;
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Laboratory for Thin Films and PhotovoltaicsEmpa – Swiss Federal Laboratories for Materials Science and TechnologyUEberlandstrasse 129, Duebendorf CH-8600, Switzerland;

Fraunhofer R&D Center for ElectromobilityFraunhofer ISCNeunerplatz 2, 97082 Wuerzburg, Germany;

Laboratory for Mechanics of Materials and NanostructuresEmpa - Swiss Federal Laboratories for Materials Science and TechnologyFeuerwerkerstrasse 39, Thun CH-3602, SwitzerlandIon Beam PhysicsETH Zuerich - Swiss Federal Institute of TechnologyOtto-Stern-Weg 5, Zuerich CH-8093, Switzerland;

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正文语种英语
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Li-rich Ni-based cathodes; NMC811; solid-state lithium-ion batteries; thin-films;

Unlocking Stable Multi-Electron Cycling in NMC811 Thin-Films between 1.5 – 4.7 V

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