Independent and well-packaged miniaturized energy storage devices (MESDs) are indispensable as power sources or backup units for integrated circuits and many dispersive electronics applications. Challenges associated with MESD development relate to their low packaged areal energy density and poor battery performance. Here, we propose a compact tube-in-tube battery configuration to overcome the areal energy density and packaging problems in microbatteries. Compact microtubular microelectrodes rolled up from patterned nanomembranes are sealed in an inert glass capillary with a thin tube wall. The resultant tube-in-tube microsized lithium-ion batteries (micro-LIBs), based on various active materials, exhibit very high and scalable packaged areal energy densities up to 605 microampere hours per square centimeter (μAh cm⁻²) or 313 μWh cm⁻² with footprints as small as 0.39–0.79 mm². This approach is a practical alternative for microbattery microelectrode, packaging, and configuration innovations.

独立且包装良好的小型储能设备（MESD）作为集成电路和许多分散式电子应用的电源或备用单元必不可少。与MESD开发相关的挑战涉及其低封装的面能量密度和较差的电池性能。在这里，我们提出了一种紧凑的管中管电池配置，以克服微电池中的面能量密度和封装问题。由图案化的纳米膜卷起的紧凑型微管微电极被密封在具有薄管壁的惰性玻璃毛细管中。基于各种活性材料的管中管式微型锂离子电池（micro-LIB）具​​有非常高且可扩展的封装面能量密度，高达每平方厘米605微安小时（μAhcm ^-2））或313μWhcm ^-2，且占地面积小至0.39–0.79 mm ²。这种方法是微电池微电极，包装和配置创新的实用替代方法。