A self-standing, UV-cured polymer networks-reinforced plastic crystal composite electrolyte for a lithium-ion battery
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- A self-standing, UV-cured polymer networks-reinforced plastic crystal composite electrolyte for a lithium-ion battery
- Ha, Hyo-Jeong; Kwon, Yo Han; Kim, Je Young; Lee, Sang-Young
- Electrolytes; Ethoxylated trimethylolpropane triacrylate; Lithium bisrifluoromethanesulphonimide; Lithium-ion batteries; Self-standing plastic crystal composite; Succinonitrile; UV-curing
- Issue Date
- PERGAMON-ELSEVIER SCIENCE LTD
- ELECTROCHIMICA ACTA, v.57, no., pp.40 - 45
- We demonstrate a facile approach to fabrication of a self-standing plastic crystal composite electrolyte for a lithium-ion battery, wherein UV (ultraviolet)-cured ethoxylated trimethylolpropane triacrylate (ETPTA) networks are incorporated into a plastic crystal electrolyte (PCE, 1 M lithium bistrifluoromethanesulphonimide (LiTFSI) in succinonitrile (SN)). An ETPTA monomer having trifunctional groups is successfully crosslinked within a very short UV-exposure time of 20 s without using any solvent, leading to the formation of a self-standing, transparent, and non-sticky plastic crystal composite electrolyte (X-PCCE). Owing to the introduction of the UV-cured ETPTA networks, the X-PCCE is capable of providing unprecedentedly robust mechanical strength even at a high concentration of PCE (i.e., ETPTA/PCE = 15/85%, w/w), along with affording high ionic conductivity. In contrast, a conventional plastic crystal composite electrolyte (F-PCCE) comprising polyvinylidenefluoride-co-hexafluoropropylene (PVdF-HFP) and PCE is difficult to be fabricated as a self-standing film and easily deformed by weak external stress. Notably, the X-PCCE shows significant improvement in electrochemical stability and interfacial resistance toward lithium metal electrodes. Ionic conductivities of the X-PCCE and the F-PCCE are examined as a function of temperature and discussed under consideration of the interaction between SN, LiTFSI, and polymers in the plastic crystal composite electrolytes.
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