Lithium-Polymer Electrolytes Based on Polyurethane Acrylate Prepared by a Solvent-Free Method

Abstract

A solvent-free, cross-linked polymer electrolyte based on polyurethane acrylate ͑PUA͒ containing LiTFSI has been prepared and tested in an all-solid-state lithium-polymer battery (Li/PUA/Li 0.33 MnO 2 ). It was found that the new polymer electrolyte could be directly membranous in the absence of any solvent and could be coated directly on a lithium foil or a composite cathode to form an ultrathin membrane of 10-50 m. The PUA electrolyte membrane was thermally stable to 220°C at the Li/Li 0.33 MnO 2 system and had a higher ionic conductivity than a polyethylene oxide based polymer electrolyte below 60°C. The cell exhibited a high initial capacity ͑190 mAh/g͒, a charge-discharge efficiency of above 99%, and could be operated at 40°C.

Electrolytes and Interphases in Li-Ion Batteries and Beyond

“…Urethane units were also used as the mechanical framework when Jiang et al copolymerized them with EO and propylene oxide (PO) linkages (eq 10D). 398 The resultant copolymer formed a thin (10−50 μm) membrane directly on electrodes thanks to the dimensional stability brought by urethane linkages, while providing higher ion conductivity (∼10 −4 S/cm) than its PEO counterparts due to the absence of crystallization by EO-linkages. Tests in cathode half cells with Li 0.33 MnO 2 yielded a capacity of ∼175 mAh/g at elevated temperature (60 °C), but faded to ca.…”

“…The coupling of SEO polymer electrolyte with these two electrodes proved to create a clever niche because the energy density limit imposed by the cathode was effectively relieved by the anode, and the ion conductivity no longer placed a kinetic hold on cell reaction at 60 °C. Urethane units were also used as the mechanical framework when Jiang et al copolymerized them with EO and propylene oxide (PO) linkages (eq D) . The resultant copolymer formed a thin (10–50 μm) membrane directly on electrodes thanks to the dimensional stability brought by urethane linkages, while providing higher ion conductivity (∼10 –4 S/cm) than its PEO counterparts due to the absence of crystallization by EO-linkages.…”

Stable polymer electrolytes based on polyether-grafted ZnO nanoparticles for all-solid-state lithium batteries

“…Although the curves for PEO-LiTFSI-ZnO(PEGME) film shows the largest capacity among the present SPEs, the released capacity is smaller than those reported by other researchers who found Li 0.33 MnO 2 could delivered a capacity of more than 150 mA h g 21 when using SPE films with thickness of about 10 mm. 28 Hence, our further research is carried on to improve the film preparation techniques and the cell assembly processes.…”

Ceramic-Polymer Electrolytes for All-Solid-State Lithium Rechargeable Batteries

“…Polymer electrolyte films used here were prepared by a solventfree casting technique in dry air. 18,19 Urethane acrylate ͑UA͒ oligomer was synthesized from 2-Hydroxyethyl acrylate, Isophorone diisocyanate ͑IPDI͒ and P͑EO/PO͒. The detailed synthesis and polymerization procedure of the poly͑urethane acrylate͒ ͑PUA͒ is illustrated in Schemes 1 and 2.…”