https://scholars.lib.ntu.edu.tw/handle/123456789/575818
標題: | Unraveling the effect of salt chemistry on long-durability high-phosphorus-concentration anode for potassium ion batteries | 作者: | Zhang W Wu Z Zhang J Liu G Yang N.-H Liu R.-S Pang W.K Li W Guo Z. RU-SHI LIU |
關鍵字: | Durability; Germanium compounds; Ions; Phosphorus; Potassium; Secondary batteries; Solid electrolytes; X ray powder diffraction; Bis(fluorosulfonyl)imide; Electrode/electrolyte interfaces; Fourier transform infra reds; Phosphorus concentration; Potassium ions; Solid electrolyte interphase layer (SEI); Synchrotron x ray diffraction; Synergistic reactions; Anodes | 公開日期: | 2018 | 卷: | 53 | 起(迄)頁: | 967-974 | 來源出版物: | Nano Energy | 摘要: | Phosphorus-based anode materials are of considerable interest for grid-scale energy storage systems due to their high theoretical capacity. Nevertheless, the low electrical conductivity of P, large volume changes during cycling, and highly-reactive phosphide surface are hindering their potential applications. Herein, outstanding long-term cycling stability with high retained potassium storage capacity (213.7 mA h g?1 over 2000 cycles) was achieved via the introduction of an alternative potassium bis(fluorosulfonyl)imide (KFSI) salt and by using a layered compound (GeP5) with a high phosphorus concentration as anode material. Fourier transform infrared spectroscopic mapping results suggest that KFSI salt helps to form an uniform solid electrolyte interphase (SEI) layer and reduces the side reactions at the electrode/electrolyte interface, thus enhancing the cycling performance. In-operando synchrotron X-ray diffraction analysis has revealed the synergistic reaction mechanisms of the K-P and K-Ge reactions. These findings indicate the enormous potential of phosphorus-based anodes for high-performance potassium ion batteries and can attract broad interest for regulating the SEI layer formation through manipulating the salt chemistry. ? 2018 Elsevier Ltd |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85054184503&doi=10.1016%2fj.nanoen.2018.09.058&partnerID=40&md5=02638bef037e81891006f72dd68a7f00 https://scholars.lib.ntu.edu.tw/handle/123456789/575818 |
ISSN: | 22112855 | DOI: | 10.1016/j.nanoen.2018.09.058 |
顯示於: | 化學系 |
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