Park, Hyeon Seo Kim, Tae-Hyun Mohd Sarofil, Anith Dzhanxinah Kim, Mingony Chung, Kyung Yoon Lee, Eun-Ho Kim, Jaehoon 2025-08-20T06:37:46Z 2025-08-20T06:37:46Z 2025-08-20 2026-01 1616-301X https://pubs.kist.re.kr/handle/201004/152993 Unlike carbon or inactive matrix-supported systems, bimetallic Sn-based materials with active/active elements can potentially mitigate the severe volume expansion of alloying-type anodes, while maintaining high energy densities. However, the mechanisms governing the buffering effect and long-term electrochemical stability in such systems are poorly understood. To address this gap, a bimetallic Sn–Bi alloy (SnBiN) with fine grains of homogeneously distributed Sn and Bi alloys (≈50 nm) is synthesized via cooling rate control. This fine-scale microstructure effectively alleviates mechanical stress during the full (de)lithiation of Sn and Bi, resulting in a pronounced buffering effect and enhanced structural stability during prolonged cycling. When employed as an anode in lithium-ion batteries, SnBiN demonstrates a reversible capacity of 542 mAh g−1 at 0.1 A g−1and long-term cycling stability (capacity of 650 mAh g−1 after 300 cycles at a discharge/charge of 0.1/0.5 A g−1). SnBiN-based full cell with a LiNi0.6Co0.2Mn0.2O2 cathode achieves high gravimetric (520 Wh kg−1) and volumetric (1128 Wh L−1) energy densities. Finite-element simulations reveal that the uniform distribution of grain boundaries in SnBiN promotes homogeneous plastic strain and damage distribution, effectively relieving internal energy buildup and suppressing crack initiation. These mechanical insights underscore the importance of interfacial engineering in designing durable alloy anodes. English John Wiley & Sons Ltd. Microscale Tin-Bismuth Alloy Prepared via Cooling Rate Control as Anode Material for High-Performance Lithium-Ion Batteries Article 10.1002/adfm.202514616 1 Advanced Functional Materials, v.36, no.4 Advanced Functional Materials 36 4 N scie 001535063700001 2-s2.0-105011845323 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article LI-ION ELECTROCHEMICAL PERFORMANCE NANOCOMPOSITE ELECTRODES COMPOSITE MECHANISM CAPACITY CO bimetallic SnBi alloys heterointerfaces lithium-ion batteries microparticles stress relaxation