Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 83, Issue -, Pages 20-23Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2017.08.012
Keywords
Sodium-ion battery; Electrolyte additive; Rubidium ion; Cesium ions; Hard carbon anode
Categories
Funding
- Natural Science Foundation of China [21676165, 21573147, 21506123]
- National Key Research and Development Program [2016YFB0901500]
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In this work, rubidium and cesium ions are studied as electrolyte additives for sodium-ion batteries. It is shown that adding small amount of Rb+ and Cs+ into the electrolyte significantly modifies the chemical composition of solid electrolyte interphase (SEI) on hard carbon (HC) surfaces, which results in a significant increase in the ionic conductivity and stability of the SEI. The results of this work show that a 0.05 M addition in the form of MPF6 (M = Rb or Cs) can increase the capacity retention of the Na/HC cells to 95.3% and 97.1% by the Rb+ and Cs+ ions, respectively, from 80.6% of the control cell after 100 cycles.
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