Open AccessPolyketones as Host Materials for Solid Polymer Electrolytes
Author(s) -
Therése Eriksson,
Amber Mace,
Yumehiro Manabe,
Masahiro YoshizawaFujita,
Yasuhide Inokuma,
Daniel Brandell,
Jonas Mindemark
Publication year - 2020
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/ab7981
Subject(s) - crystallinity , ionic conductivity , salt (chemistry) , electrolyte , lithium (medication) , materials science , conductivity , polymer , polycarbonate , amorphous solid , polymer chemistry , ionic bonding , chemical engineering , ion , chemistry , organic chemistry , electrode , composite material , medicine , engineering , endocrinology
While solid polymer electrolytes (SPEs) have great potential for use in future lithium-based batteries, they do, however, not display conductivity at a sufficient level as compared to liquid electrolytes. To reach the needed requirements of lithium batteries it is therefore necessary to explore new materials classes to serve as novel polymer hosts. In this work, SPEs based on the polyketone poly(3,3-dimethylpentane-2,4-dione) were investigated. Polyketones are structurally similar to several polycarbonate and polyester SPE hosts investigated before but have, due to the lack of additional oxygen atoms in the coordinating motif, even more electron-withdrawing carbonyl groups and could therefore display better properties for coordination to the salt cation. In electrolyte compositions comprising 25−40 wt% LiTFSI salt, it was observed that this polyketone indeed conducts lithium ions with a high cation transference number, but that the ionic conductivity is limited by the semi-crystallinity of the polymer matrix. The crystallinity decreases with increasing salt content, and a fully amorphous SPE can be produced at 40 wt% salt, accompanied by an ionic conductivity of 3 × 10 −7 S cm −1 at 32 °C. This opens up for further exploration of polyketone systems for SPE-based batteries.