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3D-structured organic-inorganic hybrid solid-electrolyte-interface layers for Lithium metal anode

Authors
Ha, SonYoon, Hyeok JunJung, Ji InKim, HayoungWon, SukyoungKwak, Jin HwanLim, Hee-DaeJin, Hyoung-JoonWie, Jeong JaeYun, Young Soo
Issue Date
5월-2021
Publisher
ELSEVIER
Keywords
3D-structured; Protective layer; SEI layer; Catalytic template; Metal anode; Li metal batteries
Citation
ENERGY STORAGE MATERIALS, v.37, pp.567 - 575
Indexed
SCIE
SCOPUS
Journal Title
ENERGY STORAGE MATERIALS
Volume
37
Start Page
567
End Page
575
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/128176
DOI
10.1016/j.ensm.2021.02.043
ISSN
2405-8297
Abstract
The solid-electrolyte-interface (SEI) layer plays a key role in lithium ion batteries, obstructing undesirable electrolyte decomposition by selective lithium ion transport into the active electrode materials. However, lithium metal anodes (LMAs) suffer from infinite volume expansion during metal deposition/stripping cycles, where the typical 2D SEI layers have a limitation in covering three-dimensionally growing lithium metal. In this study, 3D-structured organic-inorganic hybrid SEI (3D-hyb-SEI) layers were prepared using a sulfur copolymer (SCP)-poly(sulfur-random-1,3-diisopropenylbenzene) (poly (S-r-DIB)), and carbon black (CB) mixtures. Sulfur atoms of poly(S-r-DIB) form inorganic Li2S by conversion reactions with lithium ions, and the remaining DIB molecules react with the electrolyte to form organic SEI compounds. The 3D-hyb-SEI layers guide stable and durable lithium metal deposition/dissolution cycles by protecting the 3D-structured LMA, as evident from the significantly stable and long-term cycle life over 1,000 cycles, with an average Coulombic efficiency value of similar to 99.0%. The practicability of the 3D-hyb-SEI layers was demonstrated by a full-cell test with a commercial NCM622 cathode, whereby high energy and power densities of similar to 540 Wh kg and similar to 2,840 W kg respectively, were achieved with high cycling stability.
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