Title

Structurally stabilized lithium-metal anode via surface chemistry engineering

Publication Name

Energy Storage Materials

Abstract

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.

Open Access Status

This publication is not available as open access

Volume

37

First Page

315

Last Page

324

Funding Number

NRF-2018M1A2A2063347

Funding Sponsor

Ministry of Science, ICT and Future Planning

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Link to publisher version (DOI)

http://dx.doi.org/10.1016/j.ensm.2021.02.019