State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, China.
University of Chinese Academy of Sciences, 19 A Yuquan Road, Beijing, 100049, China.
Small. 2022 Feb;18(5):e2104506. doi: 10.1002/smll.202104506. Epub 2021 Nov 27.
Pursuing high areal energy density and developing scalable fabrication strategies of micro-batteries are the key for the progressive printed microelectronics. Herein, the scalable fabrication of multi-layer printable lithium ion micro-batteries (LIMBs) with ultrahigh areal energy density and exceptional flexibility is reported, based on highly conductive and mechanically stable inks by fully incorporating the polyurethane binders in dibasic esters with high-conducting additives of graphene and carbon nanotubes into active materials to construct a cross-linked conductive network. Benefiting from relatively higher electrical conductivity (≈7000 mS cm ) and stably connected network of microelectrodes, the as-fabricated LIMBs by multi-layer printing display robust areal capacity of 398 µAh cm , and remarkable areal energy density of 695 μWh cm , which are much higher than most LIMBs reported. Further, the printed LIMBs show notable capacity retention of 88% after 3000 cycles, and outstanding flexibility without any structure degradation under various torsion states and folding angles. Importantly, a wearable smart bracelet, composed of a serially connected LIMBs pack, a temperature sensor, and a light-emitting diode, is realized for the automatic detection of body temperature. Therefore, this strategy of fabricating highly conductive and mechanically stable printable ink will open a new avenue for developing high-performance printable LIMBs for smart microelectronics.
追求高面能量密度和开发可扩展的微电池制造策略是渐进式印刷微电子学的关键。在此，基于高度导电和机械稳定的油墨，通过将聚氨酯粘合剂完全整合到具有高导电性添加剂的二羧酸酯中，将石墨烯和碳纳米管融入活性材料中，构建交联导电网络，从而实现了具有超高面能量密度和出色柔韧性的多层可打印锂离子微电池（LIMB）的可扩展制造。得益于相对较高的电导率（≈7000 mS cm）和稳定连接的微电极网络，通过多层印刷制造的 LIMB 显示出 398 µAh cm 的稳健面容量和 695 μWh cm 的显著面能量密度，远高于大多数报道的 LIMB。此外，打印的 LIMB 在 3000 次循环后仍保持 88%的容量保持率，并且在各种扭曲状态和折叠角度下均具有出色的柔韧性，没有任何结构退化。重要的是，实现了由串联连接的 LIMB 包、温度传感器和发光二极管组成的可穿戴智能手链，用于自动检测体温。因此，这种制造高导电性和机械稳定的可打印油墨的策略将为高性能可打印 LIMB 开辟新途径，以用于智能微电子学。
