All-solid-state lithium-based polymer cells for high-temperature applications

Abstract

A lithium salt doped siloxane/methacrylate copolymer membrane, prepared by a rapid UV curing process, has been characterised and tested as a fully solid electrolyte in rechargeable lithium test cells using low cost materials as electrodes. In addition, results of a laboratory-scale Li-ion polymer cell, assembled by contacting a LiFePO 4 cathode with a graphite anode and using the solid polymer as electrolyte, are presented. The polymer electrolyte production process is simple and versatile and the highly crosslinked membrane demonstrates mechanical integrity, low T g and large thermal stability. It is an extra soft, non-crystalline, transparent solid and shows sufficient ionic conductivity (>10 −4 S cm −1 at 60°C) along with a wide electrochemical stability window and improved interfacial stability with respect to lithium. The performances in Li-based cells have been determined by cycling tests carried out at 80°C. Good rate capability, along with high charge/discharge efficiency even at 1C-rate, and a satisfactory cyclability have been obtained. These results outline the practical relevance of the use of this solid electrolyte membrane (which serves as the separator simultaneously) in Li-based cells conceived for high-temperature applications.

Effect of lithium bis(trifluoromethylsulfonyl)imide salt-doped UV-cured glycidyl methacrylate

“…The previous works in this field were reported by using high-molecularweight poly(ethylene oxide) (PEO) as polymer host [4][5][6]. Due to well-known crystalline properties of PEO, it was conjoined with various additives to soften the polymer backbone in order to increase the ionic conductivity [7,8]. Moreover, in order to facilitate its upscalability and lower its cost, UVinduced photopolymerization processes [9] have been developed for the preparation of SPEs without requiring the use of solvents and catalysts.…”

Synthesis, characterization, and ionic conductivity of electrospun organic–inorganic hybrid gel electrolytes

“…e) shows the characteristic isocyanate‐stretching peak at 2,263 cm −1 . One can say that production of alkoxysilane modified PDMS successful due to disappearance of both ─OH and ─NCO peaks and the appearance of peak at 1,565 cm −1 that was attributed to C─N stretching, combined with N─H out‐of‐the‐plane bending of urethane group .…”

Thin, flexible and thermally stable ceramic membranes as separator for lithium-ion batteries

“…ppm. The LiFePO 4 /C cathode material was synthesised in the form of nanostructured powder through a mild hydrothermal procedure previously described in detail [21,22]. The lithium metal foil (Aldrich, USA) was used as anode.…”

“…profile of the cell at 25 °C between 2.5 and 4.0 V vs. Li/Li + at different current regimes.Fig.9(a) shows the typical cycling profile of the Li/PCM/LiFePO 4 cell with a well defined plateau at 3.45 V vs. Li/Li + which is characteristic biphasic Li + extraction and insertion feature of LiFePO 4 based composite cathode[21,22].…”