https://scholar.dgist.ac.kr/handle/20.500.11750/10154 2026-08-10T16:18:25Z 2026-08-10T16:18:25Z Bok, Jiwon Ahn, Jeongyeon Park, Bogeun Nam, Donghyeon Ryu, Hee Seung Lee, Uijun Jang, Jaeyeong Chang, Shihyun Choi, Sungha Kwon, Minseong Chang, Woojae Ryu, Du Yeol Kim, Daegun Lim, Hee-Dae Kim, Byung-Hyun Ko, Yongmin Cho, Jinhan https://scholar.dgist.ac.kr/handle/20.500.11750/60597 2026-08-10T07:10:15Z 2026-06-30T15:00:00Z

Title: Redox-Active Ligand-Stabilized Lithium Iron Phosphate Nanoparticles for High-Performance Lithium-Ion Battery Cathode with High Capacities and Long-Term Stability Author(s): Bok, Jiwon; Ahn, Jeongyeon; Park, Bogeun; Nam, Donghyeon; Ryu, Hee Seung; Lee, Uijun; Jang, Jaeyeong; Chang, Shihyun; Choi, Sungha; Kwon, Minseong; Chang, Woojae; Ryu, Du Yeol; Kim, Daegun; Lim, Hee-Dae; Kim, Byung-Hyun; Ko, Yongmin; Cho, Jinhan Abstract: Developing cathodes that simultaneously deliver high capacity, superior rate capability, and long-term cycling stability remains a major challenge in lithium-ion batteries. Here, we report a high-performance textile cathode constructed via interfacial interaction-mediated assembly of high-energy porphyrin (PP) ligand-stabilized LiFePO4 nanoparticles (LFP NPs). For this, 19 nm LFP NPs with olivine-type intercalation mechanism were covalently integrated with amine-functionalized PP to enable multi-electron redox activity, followed by encapsulation with multi-walled carbon nanotube (MWCNT) multilayers. Subsequent thermal annealing transformed the MWCNT layers into a covalently cross-linked conductive network. As a result, the textile cathode delivers an unprecedented specific capacity of similar to 260 mAh g(-1) at similar to 0.1 C, excellent rate capability, and retains over 93% of its initial capacity after 2,000 cycles at 1 C with nearly 100% Coulombic efficiency. This work highlights interfacial interaction-mediated ligand assembly as a powerful strategy for next-generation high-capacity and durable cathodes.

2026-06-30T15:00:00Z Sangale, Sushil Shivaji Barma, Sunil Vinod Kwon, Sung-Nam Sung, Shi-Joon Kim, Dae-Hwan Byeok Jo, Sae Na, Seok-In https://scholar.dgist.ac.kr/handle/20.500.11750/60552 2026-07-31T04:40:11Z 2026-03-31T15:00:00Z

Title: Greener Colloidal Ink Engineering and Local Solidification Control for High-Performance Slot-Die Coated Perovskite Solar Modules Author(s): Sangale, Sushil Shivaji; Barma, Sunil Vinod; Kwon, Sung-Nam; Sung, Shi-Joon; Kim, Dae-Hwan; Byeok Jo, Sae; Na, Seok-In Abstract: Perovskite solar cells (PSCs) have emerged as leading candidates for next-generation photovoltaics; however, translating laboratory-scale efficiencies to industrial production remains limited by key challenges such as achieving high-quality film and addressing solvent toxicity. To overcome these limitations, we formulate colloidal ink by incorporating iodobenzene (Iodo) as an environmentally sustainable additive into a DMSO-based system, enabling scalable film fabrication via slot-die coating. It is found that Iodo-based additives enhance wettability, facilitate the formation of larger colloidal particles, and enable controlled solidification through solvent evaporation kinetics. Specifically, the inclusion of Iodo modulates colloidal size and evaporation behavior, which in turn reduces the effective nucleation barrier and promotes directional grain growth. This leads to the formation of dense, uniform films with improved crystallinity and minimal defects. Devices fabricated using Iodo-based ink achieved an efficiency of up to 22.3% (the highest reported efficiency in a highly toxic DMF-free system), encapsulated devices retaining 85% of their initial value after 1200 h of maximum power point tracking (MPPT) and 77% after 8400 h (unencapsulated devices stored in the dark), demonstrating excellent operational and long-term stability. Furthermore, the DMF-free, DMSO-based ink shows excellent scalability, achieving efficiencies of 21% and 19.5% for 2.7 and 31.50 cm2 modules, respectively.

2026-03-31T15:00:00Z Choi, Sungha Nam, Donghyeon Choi, Geon Lee, Seonho Paik, Seungeun Song, Yongkwon Choi, Seungyeop Lim, Jaejin Chang, Woojae Son, Jeong Gon Kim, Daegun Lee, Giwon Park, Sungjun Lee, Yong Min Back, Seoin Ko, Yongmin Cho, Jinhan https://scholar.dgist.ac.kr/handle/20.500.11750/60537 2026-07-30T09:10:11Z 2026-06-30T15:00:00Z

Title: High-Performance Elastomeric Lithium Metal Anodes Enabled by a Lithiophilic Monolayer-Assembled Nano-Crumpled Micro-Concave Architecture Author(s): Choi, Sungha; Nam, Donghyeon; Choi, Geon; Lee, Seonho; Paik, Seungeun; Song, Yongkwon; Choi, Seungyeop; Lim, Jaejin; Chang, Woojae; Son, Jeong Gon; Kim, Daegun; Lee, Giwon; Park, Sungjun; Lee, Yong Min; Back, Seoin; Ko, Yongmin; Cho, Jinhan Abstract: Li metal batteries are promising next-generation energy storage systems due to their high theoretical energy density and low redox potential. However, their practical application is limited by Li dendrite formation during repeated cycling, which compromises safety and shortens cycle life. Herein, we introduce a flexible elastomeric Li metal anode that integrates a lithiophilic monolayer-assembled nano-crumpled surface with microscale concave architectures. This hierarchical design was realized by densely assembling metal nanoparticles onto thiol-functionalized elastomer, followed by Ni electroplating and subsequent assembly with lithiophilic amine-terminated molecular linkers. The resulting elastomeric anode effectively reduced Li nucleation overpotential and promotes mossy Li deposition. As a result, symmetric cells exhibited excellent cycling stability for over 2,100 h at 3 mA cm-2/3 mAh cm-2. Moreover, Li||LiFePO4 full cells retained similar to 90.2% capacity after 1,000 cycles at 1C, demonstrating the potential of chemically and structurally engineered elastomeric anodes for durable and safe Li metal batteries.

2026-06-30T15:00:00Z Jeon, Sung Jae Yang, Nam Gyu Kim, Ji Youn Cho, Eunkyung Park, Jeewon Lee, Geonheon Yang, Changduk Moon, Doo Kyung https://scholar.dgist.ac.kr/handle/20.500.11750/60508 2026-07-24T05:10:18Z 2026-04-30T15:00:00Z

Title: Streamlined Y6-Analogs Enabling Efficient Ambient-Air-Processed Organic Solar Cells Author(s): Jeon, Sung Jae; Yang, Nam Gyu; Kim, Ji Youn; Cho, Eunkyung; Park, Jeewon; Lee, Geonheon; Yang, Changduk; Moon, Doo Kyung Abstract: Achieving high efficiency and long-term stability under ambient processing conditions remains a critical hurdle for the commercialization of organic solar cells (OSCs). Here, we report two new Y6-analogs-BT(BO)-v-T(C12)-4F (4F) and BT(BO)-v-T(C12)-4Cl (4Cl)-featuring vinylene (v)-bridged DA ' D cores, designed to improve the material's scalability while maintaining the structural advantages of Y6-type acceptors. Morphological and device-level investigations reveal that these M-Y6 derivatives facilitate thermodynamically stable molecular packing and favorable crystalline orientation, even when fully processed in air. Incorporation of 4F into a layer-by-layer ternary architecture with D18/L8-BO via a reproducible air-processing protocol results in a certified power conversion efficiency (PCE) of 19%, among the highest reported for conventional OSCs fabricated under ambient conditions. Moreover, 4F-based devices demonstrate exceptional thermal and photostability, retaining over 80% of their initial PCE after extended aging under the ISOS-L-1 protocol without encapsulation. These improvements are attributed to the enhanced crystallinity, vertical molecular alignment, and morphological robustness imparted by the 4F acceptor. This study identifies BT(BO)-v-T(C12)-4F as a promising air-processable acceptor for scalable OSCs that combine high efficiency with long-term operational durability.

2026-04-30T15:00:00Z