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Investigation of Synthesis, Electrochemistry and Thermal Stability of High‐energy Ball‐milled Si‐based Alloy Anodes in Lithium‐ion Batteries

Von Wiley-VCH zur Verfügung gestellt

The fast capacity fading of Si-based anodes significantly limits the application in Li-ion battery (LIB) industries. With the co-introduction of metal and oxygen elements proven to be effective, although Si-CuO composites are reported to be cost effective and technical feasible in improving the cycling performance of Si anodes, they do not meet the application standard yet. In this work, different amounts of NiO are firstly introduced into the Si-CuO system via a low-cost high energy ball-milling method to allow further optimizations. The Si-CuO samples with NiO additions generally exhibit better cycling performances, owing to less pronounced volume expansions caused by the formation of Ni-Si alloys. More specifically, Si72CuO8NiO20 shows a promising cycling performance with a capacity retention of ~ 86. 9% after 100 cycles at 0.2 C and an average coulombic efficiency of ~ 99.4%. The estimated volume expansion is ~133%, which is smaller than that of Si90CuO10 (~300%), yielding a high volumetric capacity of ~ 1700 Ah·L-1. Moreover, this sample exhibit good thermal stability tests even up to 800 °C, which shows the possibility of postprocessing for device development such as further coating a carbon layer at high temperatures.

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