The relentless development and modularization of electronics have urgently required the all-round improvement of performance, flexibility, safety, miniaturization and integration of micro-batteries. However, traditional cell design in stacked geometry fails to meet these comprehensive demands, especially high-temperature performance. Herein, we report the prototype construction of all-solid-state planar lithium ion micro-batteries (LIMBs), with characteristics of superior volumetric energy density, exceptional flexibility, extraordinary high-temperature performance, and outstanding integration of bipolar cells. The planar LIMBs were manufactured based on the interdigital patterns of lithium titanate nanospheres/graphene as anode and lithium iron phosphate microspheres/graphene as cathode, free of polymer binder and separator, working in ionogel electrolyte. The resulting LIMBs deliver ultrahigh volumetric energy density of 125.5 mWh cm⁻³, ultralong-term cyclability without capacity loss after 3300 times at room temperature, and outstanding rate capability due to the multi-directional Li-ion diffusion mechanism. Furthermore, our micro-batteries present exceptional flexibility without capacity decay under repeated bending, remarkable high-temperature performance up to 1000 cycles operated at 100 °C, superior miniaturization and simplified modularization of constructing intergrated LIMBs that readily control over the output voltage and capacity, all of which can’t be simultaneously achieved by the conventional techniques. Therefore, our planar LIMBs hold tremendous opportunities for future miniaturized and integrated electronics.

电子产品的不懈开发和模块化迫切要求全面改善性能，灵活性，安全性，微型电池的小型化和集成化。但是，传统的堆叠几何形状的电池设计无法满足这些全面的要求，尤其是高温性能。本文中，我们报告了全固态平面锂离子微电池（LIMBs）的原型结构，该结构具有出色的体积能量密度，出色的柔韧性，非凡的高温性能以及出色的双极型电池集成性。平面LIMB是基于钛酸锂纳米球/石墨烯作为阳极和磷酸铁锂微球/石墨烯作为阴极的叉指图样制造的，不含聚合物粘合剂和隔板，在ionogel电解质中工作。所得的LIMB可提供125.5 mWh cm的超高体积能密度^－3，在室温下经过3300次循环后不会造成容量损失的超长期循环能力，并且由于多向锂离子扩散机制而具有出色的倍率能力。此外，我们的微型电池还具有出色的柔韧性，在反复弯曲下不会引起容量衰减，在100°C下可进行高达1000次循环的卓越高温性能，出色的小型化和简化的集成LIMB模块化设计，可轻松控制输出电压和容量，所有这些都是传统技术无法同时实现的。因此，我们的平面LIMB为未来的小型化和集成化电子产品提供了巨大的机遇。