A Novel Cross-linked Nanocomposite Solid-state Electrolyte with Super Flexibility and Performance for Lithium Metal Battery

Publication date: Available online 13 February 2020Source: Nano EnergyAuthor(s): Shun Tang, Qian Lan, Lin Xu, Jiyuan Liang, Ping Lou, Cui Liu, Liqiang Mai, Yuan-Cheng Cao, Shijie ChengAbstractSolid-state electrolyte batteries are considered as one of the promising next generation power sources. A novel cross-linked nanocomposite polymer electrolyte (CNPE) based on poly(propylene oxide)-poly(ethylene oxide)-poly(propylene oxide) triblock main chains and surface-modified SiO2 nanoparticles are prepared to establish a super flexible and stable polymer framework. The CNPE exhibits high ionic conductivity of 1.32 mS cm-1 at ambient temperature and its electrochemical stability window reaches up to 6.5 V (versus Li+/Li). The stable cycling behavior of CNPE films is identified by the stripping/plating test at a current density of 2.4 mA cm-2 for 1700 h. The CNPE films possess excellent mechanical stability (highly stretchable with ultimate elongation of 700%). Li/CNPE/LiFePO4 batteries deliver an initial discharge capacity of 160 mAh g-1 at 0.2 C, which is 94.1% of the theoretic capacity, and maintain the high specific capacity of 148 mAh g-1 at 0.5 C. This work provides a new approach toward designing high performance electrolyte for lithium metal batteries.Graphical abstract

Source: Nano Energy - February 13, 2020 Category: Nanotechnology Source Type: research