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    Layer-by-Layer Assembly of Strong Thin Films with High Lithium Ion Conductance for Batteries and Beyond

    Year: 2021

    Journal: Small, Volume 17, AUG

    Authors: Wang, Zhen; Ouyang, Liangqi; Li, Hailong; Wagberg, Lars; Hamedi, Mahiar Max

    Organizations: European Research Council [715268]; Wenner-Gren Foundation; Knut and Alice Wallenberg Foundation (Wallenberg Wood Science Centre at KTH)

    Keywords: ionic conduction; lithium-ion batteries; mechanical strength; self-assembly

    Polyethylene oxide (PEO) is one of the most widely used polymeric ion conductors which has the potential for a wide range of applications in energy storage. The enhancement of ionic conductivity of PEO-based electrolytes is generally achieved by sacrificing the mechanical properties. Using layer-by-layer (LbL) self-assembly with a nanoscale precision, mechanically strong and self-healable PEO/polyacrylic acid composite thin films with a high Li+ conductivity of 2.3 +/- 0.8 x 10(-4) S cm(-1) at 30 degrees C, and a strength of 3.7 MPa is prepared. These values make the LbL composite among the best recorded multifunctional solid electrolytes. The electrolyte thin film withstands at least 1000 cycles of striping/plating of Li at 0.05 mA cm(-2). It is further shown that the LbL thin films can be used as separators for Li-ion batteries to deliver a capacity of 116 mAh g(-1) at 0.1 C in an all-LbL-assembled lithium iron phosphate/lithium titanate battery. Finally, it is demonstrated that the thin films can be used as ion-conducting substrates for flexible electrochemical devices, including micro supercapacitors and electrochemical transistors.
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