The rapid development of microelectronics and microsystems has stimulated the continuous evolution of high-performance and cost-effective micro-batteries. Despite their competitiveness with huge application potential, sodium ion micro-batteries (NIMBs) are still underdeveloped. Herein, we demonstrate one prototype of a quasi-solid-state planar ionogel-based NIMB constructed by separator-free interdigital microelectrodes of sodium titanate anode and sodium vanadate phosphate cathode, both of which are embedded into a three-dimensional interconnected graphene scaffold. Meanwhile, a novel NaBF₄-based ionogel electrolyte with robust ionic conductivity of 8.1 mS cm⁻¹ was used. Benefiting from the synergetic merits from the planar architecture, dominant pseudocapacitance contribution, and 3D multi-directional Na-ion diffusion mechanism, the as-assembled NIMBs exhibit high volumetric capacity of 30.7 mA h cm⁻³ at 1C, and high rate performance with 15.7 mA h cm⁻³ at 30C at room temperature and 13.5 mA h cm⁻³ at 100C at a high temperature of 100 °C. Moreover, the quasi-solid-state NIMBs present outstanding flexibility, tunable voltage and capacity output, and remarkable areal energy density of 145 μW h cm⁻² (55.6 mW h cm⁻³). Therefore, this work will provide numerous chances to construct planar NIMBs for microsystems.

中文翻译：

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具有3D Na离子扩散机制的基于离子凝胶的钠离子微电池可实现超高倍率性能

微电子学和微系统的迅速发展刺激了高性能，高性价比的微电池的不断发展。尽管它们具有巨大的应用潜力和竞争力，但钠离子微型电池（NIMB）仍未开发。在本文中，我们演示了由钛酸钠阳极和钒酸钠磷酸盐阴极的无隔板叉指式微电极构建的准固态平面基于离子凝胶的NIMB的一个原型，这两个电极均嵌入到三维互连石墨烯支架中。同时，新型的基于NaBF ₄的离子凝胶电解质具有强劲的离子电导率，为8.1 mS cm ^-1被使用了。得益于平面架构的协同优势，主要的伪电容贡献和3D多向Na离子扩散机制，组装后的NIMB在1C时表现出30.7 mA h cm ^-3的高容量，在15.7时具有高倍率性能毫安高厘米^-3，在室温下30℃和13.5毫安高厘米^-3，在100℃的高温100℃。此外，准固态NIMB具有出色的柔韧性，可调的电压和容量输出，以及显着的145μWh cm ^-2（55.6 mW h cm ^-3）的面能量密度。因此，这项工作将为构建用于微系统的平面NIMB提供许多机会。