具有优异锂存储性能的蛋黄蛋壳结构FeS2@CFs薄膜电极

利用简单的静电纺丝结合刻蚀和硫化策略获得了FeS₂@碳纤维（FeS₂@CFs）薄膜电极，每个独特的蛋黄蛋壳结构单元与全方位三维碳纤维导电网络之间的协同效应赋予了电极材料优异的锂存储性能。作为锂离子电池负极材料时，在5 A·g^-1的大电流密度下容量仍能保持在415.4 mAh·g^-1，在0.5 A·g^-1的电流密度下经过循环400圈的循环之后可逆容量约为977.9 mAh·g^-1。更重要的是，前驱体材料具有很广泛的扩展性，这可为柔性薄膜电极材料的制备提供一种设计思路。

Yolk-shell structural FeS2@CFs thin film electrode with excellent lithium storage performance

The FeS₂@carbon fibers (FeS₂@CFs) thin film electrodes were obtained using a simple electrospinning combined with etching and sulfidation strategy. The synergistic effect between each unique yolk-shell structural unit and the all-around three-dimensional carbon fiber conductive network endowed the electrode materials with excellent lithium storage performance. When used as anode material for lithium ion batteries (LIBs), the capacity can be maintained at 415.4 mAh·g^-1 at a high current density of 5 A·g^-1, and the reversible capacity is still retained at 977.9 mAh·g^-1 even after 400 cycles at a current density of 0.5 A·g^-1. More importantly, the precursor material has a wide range of scalability, which can provide a design idea for the preparation of flexible thin film electrode materials.