https://scholar.dgist.ac.kr/handle/20.500.11750/58681 Sat, 04 Apr 2026 20:08:40 GMT 2026-04-04T20:08:40Z https://scholar.dgist.ac.kr/handle/20.500.11750/60008 Title: 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. Sun, 30 Nov 2025 15:00:00 GMT https://scholar.dgist.ac.kr/handle/20.500.11750/60008 2025-11-30T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/59356 Title: 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. Fri, 31 Oct 2025 15:00:00 GMT https://scholar.dgist.ac.kr/handle/20.500.11750/59356 2025-10-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/59355 Title: 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. Sun, 30 Nov 2025 15:00:00 GMT https://scholar.dgist.ac.kr/handle/20.500.11750/59355 2025-11-30T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/59353 Title: Dual-fibrous PTFE structure enabling uniform and thick dry electrodes for high-energy-density and long-lasting batteries Author(s): Lee, Kwon-Hyung; Shim, Hyeongseok; Lee, Sang Hyun; Kim, Hyeong-Jong; Park, Chanhyun; Choi, Jingyu; Lee, Seok-Ju; Hong, Young-Kuk; Lyu, Jihong; Kim, Jin Chul; Park, Sijeong; Cha, Hyungyeon; Jin, Wooyoung; Kim, Jinsoo; Choi, Sinho; Lee, Sang-Young; Jung, Sung-Kyun; De Volder, Michael; Kim, Tae-Hee; Song, Gyujin Abstract: Dry-processed electrodes based on poly(tetrafluoroethylene) (PTFE) binder have emerged as a promising technology for sustainable, low-cost and high-areal-capacity electrode manufacturing. However, understanding its fibrillation behaviour becomes a key engineering factor to achieve mechanically robust electrodes with high electrochemical performance. Herein, we present a dual-fibrous dry electrode (DDE) fabricated via a multi-step grinding and kneading process. Compared to conventional single-type fibrous structures, the proposed DDE exhibits a more uniform material distribution, enabling better electronic conductivity and reaction homogeneity, which in turn results in better cycling stability. Additionally, the PTFE rope in the DDE demonstrates excellent mechanical integrity and edge uniformity-critical attributes for roll-to-roll manufacturing. Overall, our DDE achieves a high areal capacity of 10.1 mAh cm-2 with stable cycle retention. Furthermore, a 1.2 Ah-class stacked pouch full cell incorporating the DDE delivers a high energy density of 349 Wh kgcell-1/800 Wh Lcell-1 when paired with a lithium metal anode, and exhibits 80.2% capacity retention after 600 cycles when paired with a graphite anode, demonstrating superior performance compared to previously reported dry electrodes. Sun, 31 Aug 2025 15:00:00 GMT https://scholar.dgist.ac.kr/handle/20.500.11750/59353 2025-08-31T15:00:00Z