A super-foldable lithium-ion full battery

Developing foldable power sources with simple transport and storage remains a significant challenge and an urgent need for the advancement of next-generation wearable bioelectronics. In this study, super-foldable lithium-ion batteries are developed by integrating biomimetic methods, which effectively address the challenges of stress dispersion and mark a breakthrough in the field of super-foldable devices. A synchronous three-level biomimetic coupling technology is introduced and employed a strategy of radial compounding, gel-electrostatic molding, and temperature-programmed co-pyrolysis. This approach allows us to simultaneously prepare a super-foldable multi-level "lotus structure" cathode and a highly compatible super-foldable "peapods" structure anode. Remarkably, even after 500 000 cycles of repeated folding tests, the full battery maintains a high level of capacity stability, and the galvanostatic charge/discharge curves also exhibit a high degree of consistency. Furthermore, this battery can power an LED clock for over 2870 continuous minutes while undergoing in situ dynamic reciprocating folding, highlighting its substantial promise for practical applications. The super-foldable battery represents a full-chain innovation, extending from the super-foldable substrate to the super-foldable electrodes, and culminating in a super-foldable full battery. (© 2024 Wiley‐VCH GmbH)