Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and Environment, Beihang University, Beijing, 100191, P. R. China.
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China.
Adv Mater. 2017 Jul;29(26). doi: 10.1002/adma.201700378. Epub 2017 Apr 24.
With the rising development of flexible and wearable electronics, corresponding flexible energy storage devices with high energy density are required to provide a sustainable energy supply. Theoretically, rechargeable flexible Li-O batteries can provide high specific energy density; however, there are only a few reports on the construction of flexible Li-O batteries. Conventional flexible Li-O batteries possess a loose battery structure, which prevents flexibility and stability. The low mechanical strength of the gas diffusion layer and anode also lead to a flexible Li-O battery with poor mechanical properties. All these attributes limit their practical applications. Herein, the authors develop an integrated flexible Li-O battery based on a high-fatigue-resistance anode and a novel flexible stretchable gas diffusion layer. Owing to the synergistic effect of the stable electrocatalytic activity and hierarchical 3D interconnected network structure of the free-standing cathode, the obtained flexible Li-O batteries exhibit superior electrochemical performance, including a high specific capacity, an excellent rate capability, and exceptional cycle stability. Furthermore, benefitting from the above advantages, the as-fabricated flexible batteries can realize excellent mechanical and electrochemical stability. Even after a thousand cycles of the bending process, the flexible Li-O battery can still possess a stable open-circuit voltage, a high specific capacity, and a durable cycle performance.
随着柔性和可穿戴电子设备的不断发展，需要相应的具有高能量密度的柔性储能设备来提供可持续的能源供应。理论上，可充电的柔性 Li-O 电池可以提供高比能量密度；然而，关于柔性 Li-O 电池的构建仅有少数报道。传统的柔性 Li-O 电池具有松散的电池结构，这阻碍了其灵活性和稳定性。气体扩散层和阳极的机械强度低也导致柔性 Li-O 电池的机械性能较差。所有这些特性都限制了它们的实际应用。在此，作者基于高耐疲劳阳极和新型柔性可拉伸气体扩散层开发了一种集成的柔性 Li-O 电池。得益于独立式阴极稳定的电催化活性和分层 3D 互联网络结构的协同效应，所获得的柔性 Li-O 电池表现出优异的电化学性能，包括高比容量、优异的倍率性能和出色的循环稳定性。此外，得益于上述优点，所制备的柔性电池可以实现优异的机械和电化学稳定性。即使经过一千次弯曲循环，柔性 Li-O 电池仍能保持稳定的开路电压、高比容量和持久的循环性能。
