Copolymers of trimethylene carbonate and epsilon-caprolactone as electrolytes for lithium-ion batteries
2015 (English)In: Polymer, ISSN 0032-3861, E-ISSN 1873-2291, Vol. 63, 91-98 p.Article in journal (Refereed) Published
Random copolymers of trimethylene carbonate (TMC) and epsilon-caprolactone (CL) were synthesized through bulk ring-opening polymerization for use as host materials for solid polymer electrolytes. Amorphous electrolytes were solution-cast from the copolymers together with LiTFSI salt and showed lower T-g and higher ionic conductivity as the CL content was increased. The best-performing electrolyte, with a TMC:CL ratio of 60:40 with 28 wt% of LiTFSI, was found to have a conductivity of 1.6 x 10(-5) S cm(-1) at 60 degrees C (7.9 x 10(-7) S cm(-1) at 25 degrees C) and a T-g of -26 degrees C. This electrolyte was used in all-solid-state LiFePO4 half-cells that showed high capacity and coulombic efficiency at rates up to and including C/5.
Place, publisher, year, edition, pages
2015. Vol. 63, 91-98 p.
Polymer electrolyte, Ionic conductivity, Li-ion batteries
IdentifiersURN: urn:nbn:se:uu:diva-253055DOI: 10.1016/j.polymer.2015.02.052ISI: 000353365400012OAI: oai:DiVA.org:uu-253055DiVA: diva2:820669