Byeon, Young-Woon Ahn, Jae-Pyoung Lee, Jae-Chul 2024-01-19T16:01:25Z 2024-01-19T16:01:25Z 2022-01-25 2020-12 1613-6810 https://pubs.kist.re.kr/handle/201004/117708 The diffusion of carrier ions in alloying anodes often develops compressive stresses in front of the propagating interface, suppressing the carrier-ion diffusion and limiting their full penetration into alloying anodes during battery cycles. This phenomenon, termed "self-limiting diffusion (SLD)", reduces the rate performance of batteries and hinders the full usage of anode materials. However, SLD is mitigated in some systems where tensile residual stresses develop at the interface, causing them to manifest significantly improved rate performance and energy capacity. Here, a comparative study of Li-Si and Na-Sn systems to elucidate how the differing diffusion kinetics displayed by the two systems can influence SLD behaviors and the rate performance of batteries is performed. Experiments show that the Na diffusion into soft Sn crystals induces tensile stresses near the interface, promoting the nucleation of high-density dislocations. Thus-formed dislocations facilitate Na diffusion at ultrafast rates by providing pathways for dislocation pipe diffusion and alleviate SLD, making crystalline Sn suitable for fast-charging anode material. The outcomes of this study, while filling the knowledge gaps on the reasons for SLD, offer some guidelines for the appropriate choice of potential anode materials with superior rate performance and energy capacity suitable for future applications. English WILEY-V C H VERLAG GMBH Diffusion Along Dislocations Mitigates Self-Limiting Na Diffusion in Crystalline Sn Article 10.1002/smll.202004868 1 SMALL, v.16, no.52 SMALL 16 52 N scie scopus 000594059300001 2-s2.0-85096882144 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article IN-SITU CHARACTERIZATION ELECTROCHEMICAL LITHIATION SILICON NANOWIRES MECHANICAL-PROPERTIES PIPE DIFFUSION SODIATION FRACTURE GERMANIUM OXIDATION ORIENTATION diffusion&#8208 controlled reaction interface&#8208 controlled reaction pipe diffusion residual stress self&#8208 limiting diffusion