Osaka Research Institute of Industrial Science and Technology, Morinomiya Center, 1-6-50, Morinomiya, Joto-ku, Osaka-city, Osaka, 536-8553, Japan.
Department of Applied Chemistry, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan.
Sci Rep. 2018 Jan 19;8(1):1212. doi: 10.1038/s41598-018-19398-8.
All-solid-state batteries using inorganic solid electrolytes are considered promising energy storage systems because of their safety and long life. Stackable and compact sheet-type all-solid-state batteries are urgently needed for industrial applications such as smart grids and electric vehicles. A binder is usually indispensable to the construction of sheet-type batteries; however, it can decrease the power and cycle performance of the battery. Here we report the first fabrication of a binder-free sheet-type battery. The key to this development is the use of volatile poly(propylene carbonate)-based binders; used to fabricate electrodes, solid electrolyte sheets, and a stacked three-layered sheet, these binders can also be removed by heat treatment. Binder removal leads to enhanced rate capability, excellent cycle stability, and a 2.6-fold increase in the cell-based-energy-density over previously reported sheet-type batteries. This achievement is the first step towards realizing sheet-type batteries with high energy and power density.
全固态电池使用无机固体电解质，因其安全性和长寿命而被认为是很有前途的储能系统。对于智能电网和电动汽车等工业应用，急需可堆叠和紧凑的片状全固态电池。对于片状电池的构建，通常需要使用粘合剂；然而，它会降低电池的功率和循环性能。在这里，我们报告了第一个无粘合剂片状电池的制造。这一发展的关键是使用易挥发的聚（碳酸丙烯酯）基粘合剂；这些粘合剂可用于制造电极、固体电解质片和堆叠的三层片状物，也可以通过热处理去除。去除粘合剂可以提高倍率性能、优异的循环稳定性，并且与之前报道的片状电池相比，基于电池的能量密度提高了 2.6 倍。这一成就朝着实现具有高能量和功率密度的片状电池迈出了第一步。
