Repository Collection: nullhttps://scholar.dgist.ac.kr/handle/20.500.11750/586812026-09-30T05:35:23Z2026-09-30T05:35:23ZDry-Crafted Charge-Conductive ZrO2-x Cathode Shell Coating for High-Performance Sulfide-Based Solid-State BatteriesChoi, Yoo JungChang, HongjunJang, SungbinSohn, WoonbaeLee, JuhoKim, JinsooMoon, JanghyukRyu, Won-Heehttps://scholar.dgist.ac.kr/handle/20.500.11750/608722026-09-29T01:10:13Z2026-06-30T15:00:00ZTitle: Dry-Crafted Charge-Conductive ZrO2-x Cathode Shell Coating for High-Performance Sulfide-Based Solid-State Batteries
Author(s): Choi, Yoo Jung; Chang, Hongjun; Jang, Sungbin; Sohn, Woonbae; Lee, Juho; Kim, Jinsoo; Moon, Janghyuk; Ryu, Won-Hee
Abstract: Although all-solid-state batteries (ASSBs) offer both high energy density and improved safety, the interfacial instability between sulfide-based solid electrolytes and Ni-rich layered oxide cathodes results in poor cycling stability. In this study, a charge-conductive, black ZrO2-x (BZOx) shell coating layer was uniformly applied to single-crystalline LiNi0.8Mn0.1Co0.1O2 (NMC) cathodes using a solvent-free and dry-processed mechanofusion method to mitigate the interfacial side reactions of sulfide-based ASSBs. The BZOx shell coating layer effectively suppressed unwanted electrolyte decomposition and interfacial degradation while minimizing charge-transfer resistance. Moreover, BZOx enhanced both Li ion and electron transport while contributing to interfacial stabilization with the solid electrolyte. Compared to pristine NMC and NMC coated with stoichiometric white ZrO2, BZOx-coated NMC exhibited improved cycling stability with higher coulombic efficiency and reduced voltage hysteresis. Our dry-crafted cathode coating strategy using charge-conductive and durable ZrO2-x materials provides an effective pathway for enhancing the long-term operation stability of ASSBs.2026-06-30T15:00:00Z지속 가능한 이차전지 제조를 위한 비불소화 전략: 재료, 공정 및 전망김진수https://scholar.dgist.ac.kr/handle/20.500.11750/600082026-02-10T18:01:20Z2025-11-30T15:00:00ZTitle: 지속 가능한 이차전지 제조를 위한 비불소화 전략: 재료, 공정 및 전망
Author(s): 김진수
Abstract: To decarbonize the battery value chain and comply with per- and polyfluoroalkyl substances regulations, a “fluorine-free” strategy is crucial, replacing fluorine-based electrolytes, binders, and processes. This review assesses the impacts of removing fluorine in lithium-ion battery production. Our review shows that using aqueous binders or dry coating process, can cut n-methyl-2-pyrrolidone and polyvinylidene fluoride generation toxicity and process energy by over 40%. Life cycle assessments indicate that a fully fluorine-free process can reduce CO2 emissions by 30–45%, water usage by 40%, and hydrogen fluoride emissions entirely, thereby meeting the 2028 EU battery regulation carbon cap. Projections suggest over 15% of global cell production will adopt fluorine-free systems by 2030. We also address remaining technical challenges such as interface stability and recycling-friendly design, emphasizing the need for integrated research and regulatory demonstrations.2025-11-30T15:00:00ZDivalent anion-driven framework regulation in Zr-based halide solid electrolytes for all-solid-state batteriesKim, Jae-SeungHan, DaseulChoe, JinyeongKim, YoungkyungKim, Hae-YongLee, SoeulSeo, JiwonHam, Seung-HuiSong, You-YeobLee, Chang-DaeLee, JuhoKwak, HiramKim, JinsooJung, Yoon-SeokJung, Sung-KyunNam, Kyung-WanSeo, Dong-Hwahttps://scholar.dgist.ac.kr/handle/20.500.11750/593562026-02-03T10:40:18Z2025-10-31T15:00:00ZTitle: Divalent anion-driven framework regulation in Zr-based halide solid electrolytes for all-solid-state batteries
Author(s): Kim, Jae-Seung; Han, Daseul; Choe, Jinyeong; Kim, Youngkyung; Kim, Hae-Yong; Lee, Soeul; Seo, Jiwon; Ham, Seung-Hui; Song, You-Yeob; Lee, Chang-Dae; Lee, Juho; Kwak, Hiram; Kim, Jinsoo; Jung, Yoon-Seok; Jung, Sung-Kyun; Nam, Kyung-Wan; Seo, Dong-Hwa
Abstract: Research into solid electrolytes for all-solid-state batteries has intensified due to demand for safer and higher-energy-density batteries. Halide solid electrolytes are valued for their high ionic conductivity, oxidative stability, and ductility. Among them, Li2ZrCl6 is cost-effective but has a relatively lower Li⁺ ionic conductivity (0.4 mS cm−1 at 25 °C) compared to other halides, such as Li3InCl6 (> 1 mS cm−1 at 25 °C). Here, we elucidate a fundamental mechanism of divalent-anion-driven framework modification that enables enhanced ionic conduction in Zr-based halides. Specifically, we demonstrate enhanced Li+ conductivities for oxygen- (0.8Li2O–ZrCl4: 1.78 mS cm−1 at 25 °C) and sulfur- (0.8Li2S–ZrCl4: 1.01 mS cm−1 at 25 °C) substituted lattices. Synchrotron-based X-ray analyses identify distinct anionic sublattices and first-principles calculations reveal that divalent anions locally cluster within the lattice, inducing structural distortion and Li-site destabilization. These changes widen lithium conduction channels and alter the bonding environment, weakening and diversifying Li–Cl interactions. As a result, the energy landscape for lithium migration is flattened, leading to improved ionic conduction. These findings highlight design strategies for divalent-anion-driven framework regulation in halide solid electrolytes.2025-10-31T15:00:00ZFluorine-free binder-based dry thick electrodes with Parafilm® M toward sustainable and efficient battery manufacturingKim, Min KyungYu, TaegyunJang, SungbinLee, JuhoOh, HyeseongJang, MinCha, HyungyeonLee, HuiyeolKang, JoonheeLee, Seung MinShim, HyeongseokLee, Kwon-HyungSong, GyujinJin, WooyoungKim, Tae-HeeChoi, SinhoJeong, Kyeong-MinHan, Joong TarkYoo, Jung-KeunJung, Hun-GiSong, SanghyunPark, MyoungkeonSeong, JinwooKim, DongohChoi, HyunwooSeong, MinjongLim, Min JinHwang, Wook RyolNam, JieunJo, SanghoonKim, Jinsoohttps://scholar.dgist.ac.kr/handle/20.500.11750/593552026-03-01T16:10:15Z2025-11-30T15:00:00ZTitle: Fluorine-free binder-based dry thick electrodes with Parafilm® M toward sustainable and efficient battery manufacturing
Author(s): Kim, Min Kyung; Yu, Taegyun; Jang, Sungbin; Lee, Juho; Oh, Hyeseong; Jang, Min; Cha, Hyungyeon; Lee, Huiyeol; Kang, Joonhee; Lee, Seung Min; Shim, Hyeongseok; Lee, Kwon-Hyung; Song, Gyujin; Jin, Wooyoung; Kim, Tae-Hee; Choi, Sinho; Jeong, Kyeong-Min; Han, Joong Tark; Yoo, Jung-Keun; Jung, Hun-Gi; Song, Sanghyun; Park, Myoungkeon; Seong, Jinwoo; Kim, Dongoh; Choi, Hyunwoo; Seong, Minjong; Lim, Min Jin; Hwang, Wook Ryol; Nam, Jieun; Jo, Sanghoon; Kim, Jinsoo
Abstract: Dry electrodes are being actively developed for sustainable and efficient battery manufacturing. Currently, polytetrafluoroethylene binders dominate dry processes, raising concerns about high fluorine content regarding restrictions on per- and polyfluoroalkyl substances. Moreover, the poor adhesion necessitates a wet coating-based primer layer, which dilutes its main objectives. Here, we show dry processing approach using a thermoplastic, fluorine-free binder with low environmental impact and high productivity. Parafilm® M, a laboratory sealing film formulated with low-cost paraffin and polyethylene, consists of saturated linear hydrocarbons, offering high chemical stability from strong C-H covalent bonds and a large highest occupied molecular orbital - lowest unoccupied molecular orbital energy gap. It also has a low glass transition temperature, enabling mild-pressure activation to interconnect active materials while achieving true solvent-free adhesion without the wet-coating of primers on the current collector. This dry electrode binder provides substantial electrochemical properties based on LiNi0.8Co0.1Mn0.1O2 positive electrode over 5 mAh cm−2 for 600 cycles. This integrated approach bridges the gap between materials and processes, paving the way for sustainable advancements in battery electrode manufacturing.2025-11-30T15:00:00Z