- Conjugation-mediated and polarity-switchable interfacial layers for fast cycling of lithium-metal batteries
- 관리자 |
- 2026-02-24 10:12:47|
- 11
- 2026-02-24 10:12:47|
ㅇ [Title] Conjugation-mediated and polarity-switchable interfacial layers for fast cycling of lithium-metal batteries
ㅇ [Journal] InfoMat
ㅇ [Author] Jeong-A Lee, Haneul Kang, Yoonhan Cho, Seong Hyeon Kweon, Seonghyun Kim, Syed Azkar UI Hasan, Minju Song, Saehun Kim, Eunji Kwon, Samuel Seo, Kyoung Han
Ryu, Rama K. Vasudevan, Sang Kyu Kwak*,SeungbumHong*,andNam-SoonChoi*
ㅇ [Abstrct]
The solid electrolyte interphase (SEI) is a key property of lithium-metal batteries (LMBs), affecting their Coulombic efficiency, rate capability, and cycle life. However, conventional SEIs,
primarily formed by the decomposition of lithium salts and fluorinated additives to create inorganic-dominant interphases, suffer from inhomogeneous Li deposition and low ionic
conductivity. These intrinsic drawbacks accelerate severe side reactions with the electrolyte, cause rapid capacity fading and accumulation of dead Li, and present safety concerns,
particularly under elevated current density.In this study, we unravel the essential role of the SEI on the Li-metal anode in LMBs by creating a conjugation-mediated and polarity
-switchable interfacial architecture.Thethiophene-embeddedpolymer-likeSEI,formedbyin situelectrochemical oligomerization of thiophene, enhances Li⁺ ion conductivity by
coordinating with lone electron pairs in sp² orbitals. Concurrently, the conjugated π systems involving sp² hybridized C=C bonds and S atoms enable ,facilitating dynamic electron
-cloud redistribution during Li plating and stripping. This orbital-level adaptability accelerates Li+migration,suppressesdendriticgrowth,andstabilizestheLi-metalsurfaceunderhigh-
currentoperation.Thisstudyestablishesanewparadigminorbital-engineeredinterfacialdesigninLMBs,bridgingmolecular-scaleelectronicpolarizationwithmacroscopicfast-
chargingstability.Furthermore, our study underscores that fine-tuning the properties of the SEI and the cathode electrolyte interphase is key to unlocking the transformative potential
of LMBs for practical applications.
primarily formed by the decomposition of lithium salts and fluorinated additives to create inorganic-dominant interphases, suffer from inhomogeneous Li deposition and low ionic
conductivity. These intrinsic drawbacks accelerate severe side reactions with the electrolyte, cause rapid capacity fading and accumulation of dead Li, and present safety concerns,
particularly under elevated current density.In this study, we unravel the essential role of the SEI on the Li-metal anode in LMBs by creating a conjugation-mediated and polarity
-switchable interfacial architecture.Thethiophene-embeddedpolymer-likeSEI,formedbyin situelectrochemical oligomerization of thiophene, enhances Li⁺ ion conductivity by
coordinating with lone electron pairs in sp² orbitals. Concurrently, the conjugated π systems involving sp² hybridized C=C bonds and S atoms enable ,facilitating dynamic electron
-cloud redistribution during Li plating and stripping. This orbital-level adaptability accelerates Li+migration,suppressesdendriticgrowth,andstabilizestheLi-metalsurfaceunderhigh-
currentoperation.Thisstudyestablishesanewparadigminorbital-engineeredinterfacialdesigninLMBs,bridgingmolecular-scaleelectronicpolarizationwithmacroscopicfast-
chargingstability.Furthermore, our study underscores that fine-tuning the properties of the SEI and the cathode electrolyte interphase is key to unlocking the transformative potential
of LMBs for practical applications.
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