Electrospinning fabrication of flexible, foldable, and twistable Sb2S3/TiO2/C nanofiber anode for lithium ion batteries
Electrospinning fabrication of flexible, foldable, and twistable Sb2S3/TiO2/C nanofiber anode for lithium ion batteries
复制标题
静电纺丝制备锂离子电池柔性、可折叠、可扭曲的Sb2S3/TiO2/C纳米纤维负极
DOI：
10.1016/j.cej.2020.127400
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发表时间：
2021-03-26
影响因子：
15.1
通讯作者：
Yao, Jiannian
中科院分区：
文献类型：
--
作者：
Xia, Jing;Zhang, Xin;Yao, Jiannian
柔性电池是柔性电子设备的关键部件之一。要研制出具有优异机械耐久性能和电化学性能的柔性电池，电极设计是关键。电纺技术是生产柔性电极的一种流行策略。然而，传统的无添加剂静电纺丝法制备的纳米纤维膜，由于聚合物与过渡金属离子界面的不相容和低附着力，导致纤维结构在热处理过程中崩塌，导致其机械柔韧性较差。在这里，我们提出了一种使用异丙醇钛作为偶联剂来提高纳米纤维的耐热性和力学性能的方法。通过添加适量的异丙醇钛作为偶联剂，制备了Sb2S3/TiO2/C多孔纳米纤维膜。所制备的纳米纤维膜经4次折叠处理后保持完好且无折皱。将多孔Sb2S3/TiO2/C纳米纤维膜切割成电极，无需浆料涂覆工艺，直接组装成锂离子半电池或全电池。在锂离子半电池中，多孔Sb2S3/TiO2/C纳米纤维膜在2000 mAg(-1)的电流密度下可以循环800次。在锂离子全电池中，以50 mA g(-1)循环100次后，放电容量可达261.6 mAHg(-1)。更重要的是，充满电的电池可以打开16个红色发光二极管，展示了多孔Sb2S3/TiO2/C纳米纤维膜在柔性锂离子电池中的实用价值。
Flexible batteries are one of the key components of flexible electronic devices. To develop flexible batteries with excellent mechanical durability and electrochemical performance, electrode design is the critical part. Electrospinning technology is a popular strategy for producing flexible electrodes. However, the nanofiber membranes prepared by traditional electrospinning methods without additives have poor mechanical flexibility due to the collapse of the fiber structure during heat treatment caused by the incompatibility and low adhesion of the interface between the polymer and transition metal ions. Herein, we propose a method of using titanium (IV) isopropoxide as coupling agent to enhance the thermotolerant and mechanical properties of nanofibers. The porous Sb2S3/TiO2/C nanofiber membrane is prepared by adding an appropriate amount of titanium (IV) isopropoxide as the coupling agent. The prepared nanofiber membranes remain intact and crease-free after 4-folded manipulation. The porous Sb2S3/TiO2/C nanofiber membranes are cut into electrodes and directly assembled into lithium-ion half-cells or full-cells without slurry coating processes. In lithium-ion half-cells, the porous Sb2S3/TiO2/C nanofiber membranes could cycle 800 times at a current density of 2000 mA g(-1). In lithium-ion full-cells, a high discharge capacity of 261.6 mAh g(-1) can obtained after 100 cycles when cycled at 50 mA g(-1). More importantly, the fully charged full-cell can turn on 16 red light-emitting diodes, demonstrating the practical utility of the porous Sb2S3/TiO2/C nanofiber membrane in flexible lithium-ion batteries.