An organic ionic plastic crystal electrolyte for rate capability and stability of ambient temperature lithium batteries

Jin,L, Howlett,PC, Pringle,JM, Janikowski,J, Armand,M, MacFarlane,DR and Forsyth,M 2014, An organic ionic plastic crystal electrolyte for rate capability and stability of ambient temperature lithium batteries, Energy and environmental science, vol. 7, no. 10, pp. 3352-3361, doi: 10.1039/c4ee01085j.

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Title An organic ionic plastic crystal electrolyte for rate capability and stability of ambient temperature lithium batteries
Author(s) Jin,L
Howlett,PCORCID iD for Howlett,PC
Pringle,JMORCID iD for Pringle,JM
Forsyth,MORCID iD for Forsyth,M
Journal name Energy and environmental science
Volume number 7
Issue number 10
Start page 3352
End page 3361
Publisher Royal Society of Chemistry
Place of publication Cambridge, England
Publication date 2014-10-01
ISSN 1754-5692
Keyword(s) Science & Technology
Physical Sciences
Life Sciences & Biomedicine
Chemistry, Multidisciplinary
Energy & Fuels
Engineering, Chemical
Environmental Sciences
Environmental Sciences & Ecology
Summary 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.
Language eng
DOI 10.1039/c4ee01085j
Field of Research 030604 Electrochemistry
091205 Functional Materials
Socio Economic Objective 850602 Energy Storage (excl. Hydrogen)
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2014, Royal Society of Chemistry
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