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3D Printing Flexible Sodium-Ion Microbatteries with Ultrahigh Areal Capacity and Robust Rate Capability
Advanced Materials ( IF 29.4 ) Pub Date : 2022-08-11 , DOI: 10.1002/adma.202205569
Jiaxin Ma 1, 2 , Shuanghao Zheng 1, 3 , Liping Chi 1, 4 , Yu Liu 1 , Ying Zhang 1, 2 , Kai Wang 5 , Zhong-Shuai Wu 1, 3
Affiliation  

Rechargeable sodium-ion microbatteries (NIMBs) constructed using low-cost and abundant raw materials in planar configuration with both cathode and anode on the same substrate hold promise for powering coplanar microelectronics, but are hindered by the low areal capacity owing to the thin microelectrodes. Here, a prototype of planar and flexible 3D-printed NIMBs is demonstrated with 3D interconnected conductive thick microelectrodes for ultrahigh areal capacity and boosted rate capability. Rationally optimized 3D printable inks with appropriate viscosities and high conductivity allow the multilayer printing of NIMB microelectrodes reaching a very high thickness of ≈1200 µm while maintaining effective ion and electron-transfer pathways in them. Consequently, the 3D-printed NIMBs deliver superior areal capacity of 4.5 mAh cm−2 (2 mA cm−2), outperforming the state-of-the-art printed microbatteries. The NIMBs show enhanced rate capability with 3.6 mAh cm−2 at 40 mA cm−2 and robust long-term cycle life up to 6000 cycles. Furthermore, the planar NIMB microelectrodes, despite the large thickness, exhibit decent mechanical flexibility under various bending conditions. This work opens a new avenue for the construction of high-performance NIMBs with thick microelectrodes capable of powering flexible microelectronics.

中文翻译:

具有超高面积容量和稳健倍率能力的 3D 打印柔性钠离子微电池

可充电钠离子微电池 (NIMB) 使用低成本和丰富的平面配置原材料构建,阴极和阳极位于同一基板上,有望为共面微电子器件供电,但由于微电极薄而导致面积容量低,阻碍了该电池的发展。在这里,展示了平面和柔性 3D 打印 NIMB 的原型,该原型具有 3D 互连导电厚微电极,可实现超高面积容量和提高倍率能力。具有适当粘度和高导电性的合理优化的 3D 可打印墨水允许 NIMB 微电极的多层打印达到约 1200 µm 的非常高的厚度,同时在其中保持有效的离子和电子转移路径。因此,3D 打印的 NIMB 可提供 4.5 mAh cm 的卓越面积容量-2 (2 mA cm -2 ),优于最先进的印刷微电池。NIMB 表现出增强的倍率能力,在 40 mA cm -2 时为 3.6 mAh cm -2高达 6000 次循环的稳健长期循环寿命。此外,平面 NIMB 微电极尽管厚度很大,但在各种弯曲条件下表现出良好的机械柔韧性。这项工作为构建具有能够为柔性微电子器件供电的厚微电极的高性能 NIMB 开辟了一条新途径。
更新日期:2022-08-11
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