https://scholar.dgist.ac.kr/handle/20.500.11750/12118 2026-04-04T14:59:31Z 2026-04-04T14:59:31Z Seo, Jiyeon Lim, Jihye Chang, Hongjun Lee, Jiwon Woo, Jiyun Jung, Injun Kim, Yechan Kim, Beomjun Moon, Janghyuk Lee, Hongkyung https://scholar.dgist.ac.kr/handle/20.500.11750/57420 2025-07-25T02:42:42Z 2024-10-31T15:00:00Z

Title: Sustaining Surface Lithiophilicity of Ultrathin Li-Alloy Coating Layers on Current Collector for Zero-Excess Li-Metal Batteries Author(s): Seo, Jiyeon; Lim, Jihye; Chang, Hongjun; Lee, Jiwon; Woo, Jiyun; Jung, Injun; Kim, Yechan; Kim, Beomjun; Moon, Janghyuk; Lee, Hongkyung Abstract: Zero-excess Li-metal batteries (ZE-LMBs) have emerged as the ultimate battery platform, offering an exceptionally high energy density. However, the absence of Li-hosting materials results in uncontrolled dendritic Li deposition on the Cu current collector, leading to chronic loss of Li inventory and severe electrolyte decomposition, limiting its full utilization upon cycling. This study presents the application of ultrathin (≈50nm) coatings comprising six metallic layers (Cu, Ag, Au, Pt, W, and Fe) on Cu substrates in order to provide insights into the design of Li-depositing current collectors for stable ZE-LMB operation. In contrast to non-alloy Cu, W, and Fe coatings, Ag, Au, and Pt coatings can enhance surface lithiophilicity, effectively suppressing Li dendrite growth, thereby improving Li reversibility. Considering the distinct Li-alloying behaviors, particularly solid-solution and/or intermetallic phase formation, Pt-coated Cu current collectors maintain surface lithiophilicity over repeated Li plating/stripping cycles by preserving the original coating layer, thereby attaining better cycling performance of ZE-LMBs. This highlights the importance of selecting suitable Li-alloy metals to sustain surface lithiophilicity throughout cycling to regulate dendrite-less Li plating and improve the electrochemical stability of ZE-LMBs. © 2024 Wiley-VCH GmbH.

2024-10-31T15:00:00Z Lee, Mingyu Lee, Hyuntae Han, Jaewoong Kim, Chanyeon Lee, Hongkyung https://scholar.dgist.ac.kr/handle/20.500.11750/57412 2025-07-25T03:33:35Z 2024-09-30T15:00:00Z

Title: Current-mediated suppression of hydrogen evolution reaction in determination of Zn-metal Coulombic efficiency Author(s): Lee, Mingyu; Lee, Hyuntae; Han, Jaewoong; Kim, Chanyeon; Lee, Hongkyung Abstract: Coulombic efficiency (CE) is a crucial metric in battery research, particularly for aqueous Zinc (Zn)-metal batteries. Nonetheless, the accurate determination of Zn CE is complicated due to a lack of awareness about charge loss triggered by the hydrogen evolution reaction (HER) and non-standardized testing conditions. This study reveals the governing factors affecting the Zn CE measurement under different testing conditions, such as applied current density, Zn-plating capacity, and half-cell platforms. Through literature and experimental studies, it is evident that the Zn CE inherently increases with higher current densities and capacities. When decoupling the actual potentials of HER and Zn deposition, HER-triggered parasitic reactions can be self-suppressed owing to greater overpotential for HER than for Zn-plating at higher current densities. A consistent trend was observed when using different Zn salts and current collectors. This awareness can help standardize CE measuring protocols for validating novel concepts and materials. © 2024 Elsevier B.V.

2024-09-30T15:00:00Z 한재웅 이현태 이민규 조영성 이홍경 https://scholar.dgist.ac.kr/handle/20.500.11750/57190 2025-07-25T03:37:56Z 2024-05-31T15:00:00Z

Title: 무흐름 아연-브롬 전지용 아연 금속 음극 가역성 평가를 위한 최적 전지 구조 설계 Author(s): 한재웅; 이현태; 이민규; 조영성; 이홍경 Abstract: 리튬 이온 전지를 대체할 차세대 에너지 저장장치로 무흐름 아연-브롬 전지 기반의 초 저가 레독스 시스템이 크게 관심을 받고 있다. 그러나, 고 에너지 밀도 구현을 위한 고 용량 전착 특성에 따른 전지 단락의 문제점이 대두된다. 본 연 구진은 전지 구조의 설계를 통한 전지의 성능 차이를 규명하고, 정확한 아연 가역성 평가를 위한 최적의 설계를 제시한다. Flowless Zn-Br batteries (FL-ZBB) are emerging as a promising next-generation energy storage system to potentially replace lithium-ion batteries due to their ultra-low-cost material properties. However, challenges such as cell failure caused by high-capacity Zn deposition characteristics pose significant obstacles to achieving high energy density. This study examines the performance variations arising from different cell structure designs and proposes an optimal cell design for accurately assessing Zn reversibility.

2024-05-31T15:00:00Z Lim, Minhong Lee, Jiwon Lee, Soyeon Park, Seungsoo Lee, Hongkyung https://scholar.dgist.ac.kr/handle/20.500.11750/57162 2025-07-25T02:42:20Z 2024-07-31T15:00:00Z

Title: Modulation of Li+ microenvironment in liquid electrolyte for interface design of Li-metal anodes Author(s): Lim, Minhong; Lee, Jiwon; Lee, Soyeon; Park, Seungsoo; Lee, Hongkyung Abstract: While lithium metal anodes (LMAs) offer the highest energy density, positioning them as a promising material for graphite, they suffer from uneven electroplating morphology and the formation of Li dendrites. Given the pivotal role of the solid-electrolyte interphase (SEI), which is formed by electrolyte decomposition, in mitigating dendritic growth, extensive research has been conducted on liquid electrolytes in Li metal batteries (LMBs). This mini-review presents the historical advancements in LMB electrolytes, focusing on modulating the Li+ microenvironment and LMA interface chemistry to inhibit Li dendrite formation. We traced the evolution of LMB electrolytes from traditional formulations to advanced designs. In particular, the reinforcement of the SEI and the compact morphology of the deposited Li are deeply discussed at each advancement in liquid electrolytes. We subsequently identify common characteristics among these advanced electrolytes and conclude by discussing future directions and strategies for rational design. © 2024 Korean Chemical Society, Seoul & Wiley-VCH GmbH.

2024-07-31T15:00:00Z