Free-standing aligned fiber is capable of providing sufficient electrochemical properties for fiber electrode without sacrificing flexibility, which is highly desirable for fiber batteries that are expected to be flexible and efficient energy storage. Here, we propose a free-standing and aligned tungstate/MXene fiber spun from their mixed liquid crystals colloid for fiber-shaped lithium/sodium-ion batteries. Benefiting from the 3D interconnected ion transport tunnels, fast charge transfer frameworks and minimum ion-path tortuosity provided by the aligned structures of 2D tungstate and MXene nanosheets, the fiber is endowed with both efficient pseudocapacitive energy storage and flexibility. As expected, the fiber delivers high reversible capacity, excellent rate capability and outstanding long-term cycling performance. Even under mechanical deformations, the fiber batteries can power the LED, digital timer, temperature-humidity meter, and smart wristband. This work may promote the further development of practical fiber batteries for wearable electronics.

独立的取向纤维能够在不牺牲柔韧性的情况下为纤维电极提供足够的电化学性能，这对于期望具有柔韧性和高效能量存储的纤维电池是非常需要的。在这里，我们提出了一种由它们的混合液晶胶体纺成的独立取向的钨酸盐/ MXene纤维，用于纤维状锂/钠离子电池。得益于3D互连的离子传输隧道，快速的电荷转移框架以及2D钨酸盐和MXene纳米片的对齐结构所提供的最小的离子路径曲折性，该纤维具有高效的伪电容能量存储和灵活性。正如预期的那样，该光纤具有高可逆容量，出色的速率性能和出色的长期循环性能。即使在机械变形下，光纤电池也可以为LED，数字计时器，温湿度计和智能腕带供电。这项工作可能会促进可穿戴电子设备的实用纤维电池的进一步发展。