Centre for Cooperative Research on Alternative Energies (CIC energiGUNE), Basque Research and Technology Alliance (BRTA), Alava Technology Park, 01510 Vitoria-Gasteiz, Spain.
IKERBASQUE, Basque Foundation for Science, Calle María Díaz de Haro, 3, 48013 Bilbao, Spain.
Int J Mol Sci. 2021 Sep 25;22(19):10331. doi: 10.3390/ijms221910331.
Silicon-graphite (Si@G) anodes are receiving increasing attention because the incorporation of Si enables lithium-ion batteries to reach higher energy density. However, Si suffers from structure rupture due to huge volume changes (ca. 300%). The main challenge for silicon-based anodes is improving their long-term cyclabilities and enabling their charge at fast rates. In this work, we investigate the performance of Si@G composite anode, containing 30 wt.% Si, coupled with a LiNiCoAlO (NCA) cathode in a pouch cell configuration. To the best of our knowledge, this is the first report on an NCA/Si@G pouch cell cycled at the 5C rate that delivers specific capacity values of 87 mAh g. Several techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS) and gas chromatography-mass spectrometry (GC-MS) are used to elucidate whether the electrodes and electrolyte suffer irreversible damage when a high C-rate cycling regime is applied, revealing that, in this case, electrode and electrolyte degradation is negligible.
硅-石墨 (Si@G) 阳极受到越来越多的关注，因为硅的掺入使锂离子电池能够达到更高的能量密度。然而，硅由于巨大的体积变化（约 300%）而遭受结构破裂。硅基阳极的主要挑战是提高其长期循环稳定性并实现快速充电。在这项工作中，我们研究了含有 30wt.%硅的 Si@G 复合阳极与 LiNiCoAlO（NCA）阴极在袋式电池结构中的性能。据我们所知，这是首次报道在 5C 速率下循环的 NCA/Si@G 袋式电池，其比容量值达到 87mAh g。我们使用了几种技术，如 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、电化学阻抗谱 (EIS) 和气相色谱-质谱联用 (GC-MS)，以阐明在高 C 率循环条件下电极和电解质是否会遭受不可逆的损坏，结果表明，在这种情况下，电极和电解质的降解可以忽略不计。
