An organic ionic plastic crystal electrolyte for rate capability and stability of ambient temperature lithium batteries
Data(s) |
01/10/2014
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Resumo |
Reliable, safe and high performance solid electrolytes are a critical step in the advancement of high energy density secondary batteries. In the present work we demonstrate a novel solid electrolyte based on the organic ionic plastic crystal (OIPC) triisobutyl(methyl)phosphonium bis(fluorosulfonyl)imide (P1444FSI). With the addition of 4 mol% LiFSI, the OIPC shows a high conductivity of 0.26 mS cm-1 at 22 °C. The ion transport mechanisms have been rationalized by compiling thermal phase behaviour and crystal structure information obtained by variable temperature synchrotron X-ray diffraction. With a large electrochemical window (ca. 6 V) and importantly, the formation of a stable and highly conductive solid electrolyte interphase (SEI), we were able to cycle lithium cells (LiLiFePO4) at 30 °C and 20 °C at rates of up to 1 C with good capacity retention. At the 0.1 C rate, about 160 mA h g-1 discharge capacity was achieved at 20 °C, which is the highest for OIPC based cells to date. It is anticipated that these small phosphonium cation and [FSI] anion based OIPCs will show increasing significance in the field of solid electrolytes. |
Identificador | |
Idioma(s) |
eng |
Publicador |
Royal Society of Chemistry |
Relação |
http://dro.deakin.edu.au/eserv/DU:30068250/howlett-organicionicplastic-2014.pdf http://www.dx.doi.org/10.1039/c4ee01085j |
Direitos |
2014, Royal Society of Chemistry |
Palavras-Chave | #Science & Technology #Physical Sciences #Technology #Life Sciences & Biomedicine #Chemistry, Multidisciplinary #Energy & Fuels #Engineering, Chemical #Environmental Sciences #Chemistry #Engineering #Environmental Sciences & Ecology #SENSITIZED SOLAR-CELLS #SOLID-STATE #ELECTROCHEMICAL PROPERTIES #MOLTEN-SALTS #LIQUIDS #BEHAVIOR #CONDUCTIVITY #METAL #BIS(FLUOROSULFONYL)IMIDE #PHASES |
Tipo |
Journal Article |