Flexible lithium-ion batteries (FLIBs) potentially offer lithium-ion battery energy density required for the production of flexible electronics. The design of FLIBs depends not only on the electrode materials but also on the entire weight of the battery device. However, low capacity contribution from the flexible substrate and poor interactions between the flexible substrate and active electrode materials lead to low capacity, representing low energy density. Herein, we concentrated on designing a flexible substrate (carbon cloth, CC), improving its conductivity and surface area to deliver high capacity, and further coating porous NiCo₂O₄ nanowires on it to achieve a monolithic anode for high-gravimetric energy density FLIBs. Theoretical and in situ analyses were used to investigate Li-ion pathways and capacity contribution of the flexible substrate, respectively. In this regard, a 39.0 cm² all-flexible lithium-ion battery (with an entire weight of 281 mg) with high gravimetric energy density (314 W h kg⁻¹), excellent flexibility, and good storage performance is attained, and it exhibits potential application for future flexible energy storage devices.

中文翻译：

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芯-双壳电极促进了柔性锂离子电池的高重量能量密度†

柔性锂离子电池（FLIB）可能提供生产柔性电子产品所需的锂离子电池能量密度。FLIB的设计不仅取决于电极材料，还取决于电池装置的整体重量。然而，来自柔性基板的低容量贡献以及柔性基板与活性电极材料之间的不良相互作用导致低容量，代表低能量密度。在此，我们专注于设计柔性基板（碳布，CC），提高其导电性和表面积以提供高容量，并在其上进一步涂覆多孔NiCo ₂ O ₄纳米线，以实现用于高重力能量密度FLIB的整体式阳极。理论和原位分析分别用于研究锂离子途径和柔性基底的容量贡献。在这点上，获得了具有高重量能量密度（314W h kg ^-1），优异的柔韧性和良好的存储性能的39.0cm ²全柔性锂离子电池（总重量为281mg）。展示了未来柔性储能设备的潜在应用。