Abstract
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.
Highlights
Li ion batteries have been credited for a great revolution of the strong intermittent renewable-energy sources replacing fossil fuels
This study introduces a designed hybrid solid electrolyte (HSE) and hybrid solid cathode (HSC)
The viscosity of the slurry is modified by controlling the content of LATP and polyethylene oxide (PEO) as well as molecular weight of PEO
Summary
Li ion batteries have been credited for a great revolution of the strong intermittent renewable-energy sources replacing fossil fuels. Finding a solid electrolyte with conductivity comparable to liquids has been still a challenge, the solid electrolyte batteries are popular They are safer because flammable components are removed and deliver more power by replacing the carbon-based anodes with Li metal. This leads to a higher energy density and cycle life with less weight and cost. Without a need to struggle to safely pack a liquid electrolyte in a shape, all-solid-state batteries can be fabricated in more versatile shapes, reducing manufacturing costs This could make electric cars a more enticing proposition with longer running distance and a lower purchase price. The PEO complex displays a liquid-like property, which simultaneously induces short-circuits, the typical disadvantages of liquids
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