State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, and Laboratory of Advanced Materials, Fudan University, Shanghai, 200438, P. R. China.
Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, Potsdam, 14476, Germany.
Angew Chem Int Ed Engl. 2023 Jun 12;62(24):e202303616. doi: 10.1002/anie.202303616. Epub 2023 May 3.
Fiber lithium-ion batteries represent a promising power strategy for the rising wearable electronics. However, most fiber current collectors are solid with vastly increased weights of inactive materials and sluggish charge transport, thus resulting in low energy densities which have hindered the development of fiber lithium-ion batteries in the past decade. Here, a braided fiber current collector with multiple channels was prepared by multi-axial winding method to not only increase the mass fraction of active materials, but also to promote ion transport along fiber electrodes. In comparison to typical solid copper wires, the braided fiber current collector hosted 139 % graphite with only 1/3 mass. The fiber graphite anode with braided current collector delivered high specific capacity of 170 mAh g based on the overall electrode weight, which was 2 times higher than that of its counterpart solid copper wire. The resulting fiber battery showed high energy density of 62 Wh kg .
纤维锂离子电池是一种很有前途的可穿戴电子产品电源策略。然而，大多数纤维集流器都是固体的，其中包含大量的非活性材料，导致电荷传输缓慢，从而使得能量密度非常低，这在过去十年中阻碍了纤维锂离子电池的发展。在这里，通过多轴缠绕的方法制备了一种具有多个通道的编织纤维集流器，不仅可以提高活性材料的质量分数，还可以促进纤维电极中的离子传输。与典型的固体铜丝相比，编织纤维集流器仅使用其三分之一的质量就可以容纳 139%的石墨。具有编织集流器的纤维石墨阳极的整体电极重量的比容量高达 170 mAh·g，是其对应固体铜丝的两倍。由此产生的纤维电池的能量密度高达 62 Wh·kg。
