No abstract

In this study, octadecylamine modified MMT (C18-MMT) filled SBR nanocomposites were manufactured using a latex method and a compounding method. Cure characteristics and mechanical properties of SBR compounds filled with C18-MMT, Cloisite 15A, carbon black and Na-MMT were also evaluated. By using the latex method, the number of layers of the silicates in the SBR matrix reduced from the original 14-15 layers to 1-4 layers. This was due to the presence of octadecyl ammonium ions which reduced the number of layers of the re-aggregated silicates during the process of co-coagulation. The SBR/C18-MMT nanocomposites using the latex method showed the highest oscillating disc rheometer (ODR) torques, tensile strength, modulus and tear energy. These increased mechanical properties can be attributed to the excellent reinforcing effect of the silicates well dispersed in the rubber matrix rather than the effect of the increase in the degree of crosslinking. Without alkyl ammonium ions in the latex method, the level of dispersion of silicates in the SBR matrix was very poor.The SBR/C18-MMT nanocomposites using the compounding method were found to have a lower degree of modulus, tensile strength and tear energy due to the low level of the dispersion of silicates than the SBR/C18-MMT nanocomposites using the latex method.

Considering the safety issues of Li ion batteries, an all-solid-state polymer electrolyte has been one of the promising solutions. Achieving a Li ion conductivity of a solid-state electrolyte comparable to that of a liquid electrolyte (>1 mS/cm) is particularly challenging. Even with characteristic ion conductivity, employment of a polyethylene oxide (PEO) solid electrolyte has not been sufficient due to high crystallinity. In this study, hybrid solid electrolyte (HSE) systems have been designed with Li1.3Al0.3Ti0.7(PO4)3 (LATP), PEO and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). A hybrid solid cathode (HSC) is also designed using LATP, PEO and lithium cobalt oxide (LiCoO2, LCO)—lithium manganese oxide (LiMn2O4, LMO). The designed HSE system has 2.0 × 10−4 S/cm (23 °C) and 1.6 × 10−3 S/cm (55 °C) with a 6.0 V electrochemical stability without an additional separator membrane introduction. In these systems, succinonitrile (SN) has been incorporated as a plasticizer to reduce crystallinity of PEO for practical all-solid Li battery system development. The designed HSC/HSE/Li metal cell in this study operates without any leakage and short-circuits even under the broken cell condition. The designed HSC/HSE/Li metal cell in this study displays an initial charge capacity of 82/62 mAh/g (23 °C) and 123.4/102.7 mAh/g (55 °C). The developed system overcomes typical disadvantages of internal resistance induced by Ti ion reduction. This study contributes to a new technology development of all-solid-state Li battery for commercial product design.

No abstract