Flexible, Stretchable, Water-/Fire-Proof Fiber-Shaped Li-CO2 Batteries with High Energy Density

作者：Chen, Lin; Zhou, Jingwen; Wang, Yunhao; Xiong, Yuecheng; Zhang, Junxiang; Qi, Guicai; Cheng, Jianli; Wang, Bin^*

来源：Advanced Energy Materials, 2023, 13(1).

DOI：10.1002/aenm.202202933

• fiber-shaped
• flexible
• high energy density
• Li-CO2 batteries
• stretchable

Flexible fiber-shaped Li-CO2 batteries are regarded to be a potential candidate to power accessories for wearable electronics due to their high theoretical energy density and carbon-neutral capability. However, the difficulties of electrode preparation and architecture design make it challenging for current Li-CO2 batteries to keep a suitable balance between electrochemical performance and multifunctionality, one-dimensional configuration and so forth. Herein, a flexible, stretchable, water-/fire-proof fiber-shaped Li-CO2 battery is constructed through an integrated electrode design strategy and a mechanical engineering-inspired "spring"-like device architecture. Impressively, the as-prepared highly-active Mo2N anchored N-doped carbon nanotubes/carbon fiber hybrid bundle (CFB@NCNT-Mo2N) cathode delivers a large full capacity of 5586.0 mu Ah cm(-1), corresponding to a high energy density of 14 250 Wh kg(cathode)(-1). Meanwhile, it also demonstrates a low charge potential of approximate to 3.7 V, excellent rate capabilities, and outstanding long-term cycling stability of 525 cycles. Furthermore, the constructed "spring"-like fiber-shaped Li-CO2 battery device using CFB@NCNT-Mo2N and a newly-proposed gracile fibrous Li metal anode exhibits excellent adaptability to deformations including bending and stretching, as well as other favorable features like water-/fire-resistance. The successful demonstration of the proposed high-performance and multifunctional Li-CO2 batteries provide an effective model for designing future flexible energy storage devices beyond metal-gas batteries for wearables in specific application scenarios.

• 单位
  电子科技大学