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Structurally stabilized lithium-metal anode via surface chemistry engineering

Structurally stabilized lithium-metal anode via surface chemistry engineering
Lee, JaewooChoi, Seung HyunQutaish, HamzehHyeon, YuhwanHan, Sang AHEO, YOON UKWhang, DongmokLee, Jong-WonMoon, JanghyukPark, Min-SikKim, Jung HoDou, Shi Xue
Date Issued
Dendrite-free lithium (Li) has been the primary issue for the practical application of metallic Li anode. Repeated Li plating/stripping is known to inevitably lead to severe volume changes and gradual Li dendrite growth, eventually resulting in irreversible Li (called dead-Li) as an unexpected feature. In order to avoid the dead-Li, a lithiophilic surface is highly desirable and a nanoarchitectured host for metallic Li is also required. Herein, cobalt-embedded, mesoporous, nitrogen-doped graphite (N-doped graphite) is strategically proposed as a new innovative Li-metal storage host. After tuning the surface chemistry, the material shows high Li ion affinity as well as a highly lithiophilic surface, which is attributed to the low formation energy of N-doped graphite, strongly supported by density functional theory calculations. As a result, the desirable anode shows excellent electrochemical performance with high Li-metal reversible capacity and even stable long-term cyclability with no dead-Li formation. Our findings pave the way to optimize the Li-metal host up to the limit of the theoretical capacity.
Article Type
ENERGY STORAGE MATERIALS, vol. 37, page. 315 - 324, ACCEPT
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