https://scholars.lib.ntu.edu.tw/handle/123456789/630124
標題: | Enabling Long-Cycling Life of Si-on-Graphite Composite Anodes via Fabrication of a Multifunctional Polymeric Artificial Solid-Electrolyte Interphase Protective Layer | 作者: | Abdollahifar, Mozaffar Vinograd, Andrey Lu, Chia Yang Chang, Shu Jui Müller, Jannes Frankenstein, Lars Placke, Tobias Kwade, Arno Winter, Martin CHI-YANG CHAO NAE-LIH WU |
關鍵字: | artificial SEI | high-capacity anode | long-cycling life | polymer coating | silicon-on-graphite composite | 公開日期: | 31-八月-2022 | 出版社: | AMER CHEMICAL SOC | 卷: | 14 | 期: | 34 | 起(迄)頁: | 38824 | 來源出版物: | ACS Applied Materials and Interfaces | 摘要: | The energy density of lithium-ion batteries (LIBs) can be meaningfully increased by utilizing Si-on-graphite composites (Si@Gr) as anode materials, because of several advantages, including higher specific capacity and low cost. However, long cycling stability is a key challenge for commercializing these composites. In this study, to solve this issue, we have developed a multifunctional polymeric artificial solid-electrolyte interphase (A-SEI) protective layer on carbon-coated Si@Gr anode particles (making Si@Gr/C-SCS) to prolong the cycling stability in LIBs. The coating is made of sulfonated chitosan (SCS) that is crosslinked with glutaraldehyde promoting good ionic conduction together with sufficient mechanical strength of the A-SEI. The focused ion beam-scanning electron microscopy and high-resolution transmission electron microscopy images show that the SCS is uniformly coated on the composite particles with thickness in nanometer. The anodes are investigated in Li metal cells Si@Gr/C-SCS||Li metal) and lithium-ion full-cells (LiNi0.6Co0.2Mn0.2O2 (NCM-622)||Si@Gr/C-SCS) to understand the material/electrode intrinsic degradation as well as the impact of the polymer coating on active lithium losses because of the continuous SEI (re)formation. The anode composites exhibit a high capacity reaching over 600 mAh g-1, and even without electrolyte optimization, the Si@Gr/C-SCS illustrates a superior long cycle life performance of up to 1000 cycles (over 67% capacity retention). The excellent long-term cycling stability of the anodes was attributed to the SCS polymer coating acting as the A-SEI. The simple polymer coating process is highly interesting in guiding the preparation of long-cycle-life electrode materials of high-energy LIB cells. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/630124 | ISSN: | 19448244 | DOI: | 10.1021/acsami.2c10175 |
顯示於: | 化學工程學系 |
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