Herein, we develop a novel all-in-one cathode-separator-anode monolith architecture designed for high-capacity, ultra-thin flexible batteries. This architecture involves directly casting electrode slurry onto both sides of a polypropylene (PP) separator. Controlled volatility and wettability of the solvent system are critical for the formation of neat electrode coating layers on the PP separator. The monolith structure offers remarkable flexibility and intimate contact between the electrode and separator, which is especially advantageous when stacked for higher areal capacity. The monoliths are conjoined into an all-in-one multi-layered monolith structure, deploying electrode slurry as an ‘electrochemically active adhesive’ between them, enabling the creation of high-capacity, ultra-thin flexible batteries. The resulting pouch cell exhibits a high capacity of 44.5 mA h (areal capacity of 4.9 mA h cm⁻²) at 1 mA and a thickness below 1 mm. Notably, this cell boasts superior rate capability even at this high capacity, showing a discharge capacity of 36.3 mA h at 20 mA. Practical application of this high-capacity, ultra-thin flexible battery is demonstrated in a band-type light-therapy patch, which shows operational stability when bent around a human arm. This development marks a significant advancement in the design of ultra-thin, high-capacity flexible batteries, with potential applications in flexible and wearable battery technologies.

中文翻译：

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高容量超薄柔性锂离子电池，通过铸造一体化正极-隔膜-负极整体材料提高倍率性能


在此，我们开发了一种新颖的一体式阴极-隔膜-阳极整体结构，专为高容量、超薄柔性电池而设计。该架构涉及将电极浆料直接浇注到聚丙烯 (PP) 隔膜的两侧。控制溶剂系统的挥发性和润湿性对于在 PP 隔膜上形成整齐的电极涂层至关重要。整体结构提供了显着的灵活性以及电极和隔膜之间的紧密接触，这在堆叠以获得更高面积容量时尤其有利。这些单体连接成一体式多层单体结构，在它们之间使用电极浆料作为“电化学活性粘合剂”，从而能够制造高容量、超薄柔性电池。所得的软包电池在1mA电流下表现出44.5mAh h的高容量（4.9mAh cm ^-2的面积容量）且厚度低于1mm。值得注意的是，即使在如此高的容量下，该电池也具有出色的倍率性能，在 20 mA 电流下的放电容量为 36.3 mA h。这种高容量、超薄柔性电池在带式光疗贴片中的实际应用得到了证明，当弯曲在人的手臂上时，该贴片显示出操作稳定性。这一进展标志着超薄、高容量柔性电池设计的重大进步，在柔性和可穿戴电池技术方面具有潜在的应用前景。