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http://dx.doi.org/10.5012/bkcs.2013.34.7.2029

Effects of Phosphorous-doping on Electrochemical Performance and Surface Chemistry of Soft Carbon Electrodes  

Kim, Min-Jeong (Graduate School of Green Energy Technology, Chungnam National University)
Yeon, Jin-Tak (Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST))
Hong, Kijoo (GS Energy, CRD Center)
Lee, Sang-Ick (GS Energy, CRD Center)
Choi, Nam-Soon (Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST))
Kim, Sung-Soo (Graduate School of Green Energy Technology, Chungnam National University)
Publication Information
Bulletin of the Korean Chemical Society / v.34, no.7, 2013 , pp. 2029-2035 More about this Journal
Abstract
The impact of phosphorous (P)-doping on the electrochemical performance and surface chemistry of soft carbon is investigated by means of galvanostatic cycling and ex situ X-ray photoelectron spectroscopy (XPS). P-doping plays an important role in storing more Li ions and discernibly improves reversible capacity. However, the discharge capacity retention of P-doped soft carbon electrodes deteriorated at $60^{\circ}C$ compared to non-doped soft carbon. This poor capacity retention could be improved by vinylene carbonate (VC) participating in forming a protective interfacial chemistry on soft carbon. In addition, the effect of P-doping on exothermic thermal reactions of lithiated soft carbon with electrolyte solution is discussed on the basis of differential scanning calorimetry (DSC) results.
Keywords
Soft carbon; Phosphorous doping; Solid electrolyte interphase; Electrolyte; Thermal reactions;
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