https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/179 Mon, 13 Jul 2026 08:59:34 GMT 2026-07-13T08:59:34Z https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/218615 Title: Prussian blue analogue-assisted asymmetric flow-electrode capacitive mixing (F-CapMix) with high positive net power density Authors: Hwang, Insung; Myeong, Seungcheol; Jung, Yeon-Gil; Lee, Dongsoo; Yang, SeungCheol; Paik, Ungyu; Song, Taeseup Abstract: Flow-electrode capacitive mixing (F-CapMix) is a promising technology for harvesting renewable energy from the salinity gradient between seawater and river water. However, conventional F-CapMix systems relying exclusively on activated carbon (AC) flow-electrodes face intrinsic limitations regarding power generation performance. In a symmetric configuration, the potentials of both flow-electrodes are established within a similar range, resulting in a low initial open-circuit voltage (OCV) that leaves the membrane Donnan potential arising from the salinity gradient as the sole driving force for power generation. In this study, we established a high-performance asymmetric flow-electrode system by incorporating NiFe-PBA into an AC-based cathode. Mechanistically, the NiFe-PBA induces a potential tuning effect that positively shifts the equilibrium potential of cathode, thereby significantly elevating the overall cell OCV. Furthermore, the highly reversible redox reactions of NiFe-PBA substantially increase the ion storage capacitance and facilitate charge transfer, effectively reducing the internal cell resistance. Driven by the synergy of this potential tuning effect and enhanced electrochemical kinetics, the asymmetric system achieved a maximum gross power density of 3.03 W/m2, which is a more than threefold increase compared to the symmetric counterpart. Furthermore, through systematic optimization of the flow-electrode and feed water flow rates, a superior net power density of 1.96 W/m2 was achieved even after accounting for the pumping energy required for system operation. Copyright Sun, 01 Nov 2026 00:00:00 GMT https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/218615 2026-11-01T00:00:00Z https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/218432 Title: Design-driven multi-element doping for long-life High-Ni NCM cathodes: Criteria-guided dopant selection and one-pot element-specific intraparticle placement Authors: Lee, Nam Kyeong; Park, Sol Hui; Eo, Sung-Hwa; Lee, Yun Jung Abstract: Despite their high energy density, Ni-rich layered NCM cathodes suffer from coupled degradation rooted in structural instability. Here, a criteria-guided Ti-Al-Mg co-doping strategy (complementary roles, radius compatibility, near-trivalent charge, abundance) is implemented via a one-pot solid-state route. Crucially, near-surface Mg enrichment is directly mapped, presumably associated with its larger ionic radius. Together with Ti/Al incorporation into bulk transition-metal (TM) slabs, this element-specific intraparticle placement of multi-dopants is coordinated—an inherently non-trivial task—via a one-pot calcination without multistep gradient engineering. This radius-mismatch-driven, one-pot placement constitutes a previously unreported route to couple interfacial stabilization (Mg at the surface) with bulk lattice reinforcement (Ti/Al in TM slabs). Leveraging the complementary contributions of the three dopants, this coordinated placement suppresses Li/Ni cation mixing, crack propagation, and impedance growth. In Li-metal half-cells, the resulting cathode (TAM-1) exhibits significantly enhanced cycling stability, retaining 94.5% capacity after 500 cycles at 1C, outperforming undoped Ni83 (30.0%). Operando optical microscopy directly visualizes suppressed crack initiation/propagation in TAM-1. Overall, this study establishes that both rational dopant selection (Ti/Al/Mg chosen by explicit criteria) and element-specific dopant placement (near-surface Mg; bulk TM-slab Ti/Al) are practical, generalizable levers for durable Ni-rich layered oxides—enabling bulk–interface co-reinforcement with standard solid-state processing. Sat, 01 Aug 2026 00:00:00 GMT https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/218432 2026-08-01T00:00:00Z https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/212305 Title: Navigating structure-kinetics-capacity trilemma for anode materials in sodium-ion batteries Authors: Wang, Jian; Sun, Zhaowei; Wang, Yafei; Wang, Kaizhao; Wang, Xinyue; Hwang, Jang-Yeon; Liu, Feng; Hu, Jin; Xiong, Shizhao Abstract: With the rapid development of an energy-consuming society, the modern world is eager for high-performance and low-cost energy storage technologies such as sodium-ion batteries (SIBs). The numerous proposals for SIB anode materials, however, are inherently governed by the Structure–Kinetics–Capacity (SKC) Trilemma, which captures the trade-off among structural integrity, fast sodiation/desodiation kinetics, and high specific capacity. This review critically analyzes recent progress in SIB anode engineering through the lens of this trilemma. We systematically deconstruct how intercalation, adsorption/desorption, alloying, and conversion anodes occupy distinct compromise regions, and we summarize how electrolyte-derived interphases modulate kinetics and stability across these classes. We then evaluate key engineering strategies, including nanosizing, carbon compositing, and electrolyte/interphase regulation, as targeted efforts to mitigate competing demands and expand the performance envelope, supported by a quantitative radar-plot benchmark with transparent normalization. To strengthen practical relevance beyond half-cell data, we discuss full-cell translation criteria, including N/P balancing, sodium inventory loss associated with low initial Coulombic efficiency (ICE), pre-sodiation and sodium-compensation routes, and cathode matching. We further compare dominant degradation mechanisms and clarify how structural and interphase instabilities trigger transport decay, polarization growth, and capacity fading within the trilemma framework. Finally, we outline future directions that may transcend conventional trade-offs, including atomically precise material design, operando characterization with multiscale modeling, scalable electrolyte-by-design, and emerging non-equilibrium synthesis such as high-temperature shock synthesis. By providing this unified conceptual framework, this review aims to guide the design of next-generation anodes that more holistically resolve the trilemma, propelling SIBs toward practical, high-performance energy storage. Wed, 01 Jul 2026 00:00:00 GMT https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/212305 2026-07-01T00:00:00Z https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/212883 Title: Electrochemical catalytic interface toward high-energy density lithium-sulfur batteries Authors: Park, Hyeona; Lee, Chaiwon; Yang, Yul; Kansara, Shivam; Hwang, Jang-Yeon Abstract: Lithium-sulfur (Li-S) batteries with lithium sulfide (Li2S) cathodes are promising candidates for next-generation batteries owing to their high energy density and compatibility with lithium-free anode materials. However, Li2S cathodes face challenges arising from high activation energy barriers and the shuttle effect of polysulfide intermediates. Herein, we present an innovative strategy to maximize the energy density and cycle life of Li-S batteries by integrating a pelletized Li2S/graphene-carbon nanotubes (Li2S/Gr-CNTs) composite cathode with a Ti3C2Tx MXene /CNTs composite interlayer (Int. M). Through high-pressure pelletization, the Gr-CNTs physically entrap Li2S particles, confining them within a robust structural framework while preserving excellent electrically conductive pathways. Int. M placed on the surface of the Li2S/Gr-CNTs composite cathode functions as a catalytic interface with strong affinity for polysulfide intermediates and mixed ionic/electronic conducting properties, thereby promoting electrochemical conversion reactions. The integration of Li2S/Gr-CNTs (with 90 wt% Li2S content) with Int. M maintains the ultra-thin electrode thickness of 109 μm and achieves an areal capacity of 8 mAh cm−2 at 0.1 C, resulting in a high volumetric capacity of 734 mAh cm−3. The Li-S full batteries coupling with a graphite anode demonstrate unprecedented capacity retention of ∼80% after 1000 cycles at 0.5 C. Wed, 01 Jul 2026 00:00:00 GMT https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/212883 2026-07-01T00:00:00Z