Observation of Electrochemically Driven Elemental Segregation in a Si Alloy Thin‐Film Anode and its Effects on Cyclic Stability for Li‐Ion Batteries
作者： Minsub Oh , Sekwon Na , Chang‐Su Woo , Jun‐Ho Jeong , Sung‐Soo Kim
关键词: Materials science 、 Ion 、 Electrochemistry 、 Characterization (materials science) 、 Scanning electron microscope 、 Chemical engineering 、 Ripple 、 Pattern formation 、 Anode 、 Transmission electron microscopy
摘要: The results of employing (Ti, Fe)-alloyed Si thin-film anode for Li-ion batteries are reported. material demonstrates an impressive cyclic stability with stable operation more than 500 cycles at a capacity higher 1400 mAh g−1. Materials characterization using scanning electron microscopy and transmission illuminates intriguing materials process behind the performance: ripple-like pattern formation via electrochemically driven segregation inactive elements (Ti Fe). ripple structure plays buffer role by suppressing loss active upon further cycling, allowing to gradually transform into array microbumps. morphological evolution helps endure long (even up 1000 cycles) without catastrophic failure as bumps shrank slowly steadily, consistent electrochemical data.
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