Intrinsic self-healing is one essential feature for the next generation of flexible and wearable electronics. Previous studies on self-healing flexible energy storage have mainly focused on macroscopic self-healing and supercapacitors, whereas the microscopic self-healing and batteries utilization remain a challenge. Here we report a flexible and wearable aqueous lithium ion yarn battery by in-situ polymerization of calcium ion cross-linking sodium polyacrylate and sodium alginate self-healable hydrogel electrolyte. The microscopic self-healing contributes to cyclic stability of 5000 cycles with 70% capacity retention, and the macroscopic self-healing results in 8 times of complete breaking/healing with 68% capacity retention. Both performances outperform aqueous lithium ion batteries and even other aqueous batteries reported so far to the best of our knowledge. The unprecedented microscopically and macroscopically intrinsic self-healing-resulted fantastic lifespan of the yarn battery, together with its features of high capacity, fewest components and handy fabrication, make it promising in flexible and wearable electronics.

固有的自我修复功能是下一代柔性可穿戴电子产品的一项重要功能。以前关于自修复柔性能量存储的研究主要集中在宏观自修复和超级电容器上，而微观自修复和电池利用仍然是一个挑战。在这里，我们通过原位报告了一种柔性可穿戴的水性锂离子纱电池钙离子交联聚丙烯酸钠和海藻酸钠自修复水凝胶电解质的聚合 微观的自我修复功能可实现5000个循环的循环稳定性，并具有70％的容量保持率；宏观的自我修复可实现8倍的完全断裂/修复，而容量保持率达68％。据我们所知，到目前为止，这两项性能均优于锂离子电池，甚至其他水电池。纱线电池具有前所未有的微观和宏观固有的自我修复效果，使用寿命长，并且具有高容量，最少的部件和方便的制造等特点，使其在柔性和可穿戴电子产品中很有前途。