Abstract
? 2022 Elsevier B.V.Development of all-solid-state lithium-ion batteries (ASSLBs) with potentially high energy density and safety is critical for next-generation energy storage devices. In this work, a low-cost flexible Li2SnO3(LSO)-coupled PEO-based composite single-ion conducting polymer solid-state electrolyte (CSIPE) was prepared by a simple solvent-free solid-phase method. The obtained LSO-coupled CSIPE exhibited a high ionic conductivity of 5.59 × 10?4 S cm?1 at 60 °C with a high lithium ion transference number of 0.54 and an electrochemical stability window as high as 5.28 V. In addition, the results based on Vogel-Tammann-Fulcher (VTF) model and differential scanning calorimetry (DSC) measurements indicated that the presence of LSO reduced the activation energy for lithium ion migration and the crystallinity of the polymer matrix to provide channels and flexible polymer chains for the transportation of lithium ions. Moreover, the fabricated lithium metal anode based full cell worked stably for more than 100 cycles maintaining a high specific capacity of 127.1 mAh g?1 and a specific capacity retention ratio of 96.5% at a high cycling rate of 0.5 C. While, the CSIPE also demonstrated an excellent rate performance and outstanding adaptation to cathodes. Furthermore, the obtained LSO-coupled CSIPE remained stable even at a temperature as high as 322 °C without thermal runaway, and worked under different current densities for 450 h without short-circuiting, indicating good interfacial stability to ensure the safety of the batteries. It is expected that this LSO-coupled CSIPE is a promising substitute for liquid electrolytes with broad commercial prospects.
NSTL
Elsevier