Moderately concentrated electrolyte improves solid–electrolyte interphase and sodium storage performance of hard carbon

Jagabandhu Patra, Hao Tzu Huang, Weijiang Xue, Chao Wang, Ahmed S. Helal, Ju Li, Jeng Kuei Chang

研究成果: Article同行評審

75 引文 斯高帕斯(Scopus)

摘要

Hard carbon (HC) is a promising anode for sodium-ion batteries. The current hurdles for the HC electrodes are insufficient coulombic efficiency (CE), rate capability, and cyclic stability. This study reveals that an intelligent electrolyte design can effectively overcome these limitations. The sodium salt, concentration, and solvent of the electrolytes are systematically investigated. Incorporation of ethylene carbonate (EC) in propylene carbonate (PC) electrolyte can promote the formation of contact ion pairs and ion aggregates between Na+ and FSI. At a moderate concentration, the 3 mol dm−3 NaFSI in PC:EC electrolyte with reasonable conductivity and viscosity can lead to the formation of a robust organic–inorganic balanced solid–electrolyte interphase, which is thoroughly examined by electrochemical impedance spectroscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy. With this, the first-cycle and steady-state CE of the HC electrode is increased to 85% and>99.9%, respectively, and the reversible sodiation/desodiation capacities at high rates are markedly improved. In addition, 95% of the initial capacity can be retained after 500 charge–discharge cycles. The proposed electrolyte represents a huge step towards HC electrodes with high effectiveness and durability for electrochemical Na+ storage.

原文English
頁(從 - 到)146-154
頁數9
期刊Energy Storage Materials
16
DOIs
出版狀態Published - 2019 1月

All Science Journal Classification (ASJC) codes

  • 可再生能源、永續發展與環境
  • 一般材料科學
  • 能源工程與電力技術

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