Huang Lei, Zhou Tianzhu, Zhu Siyu, Yang Tianqi, Zhou Xuhui, He Bing, Wang Shuai, Yan Wei, Wei Lei
School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore.
School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore.
Natl Sci Rev. 2024 Jul 30;11(10):nwae262. doi: 10.1093/nsr/nwae262. eCollection 2024 Oct.
Fiber-shaped Li-S batteries are attractive for constructing smart textiles as flexible power solutions due to their high theoretical specific capacity, flexibility and wearability. However, severe interfacial issues, such as the shuttle effect of polysulfides on the cathode side, lead to capacity decay and poor lifespan of the batteries. Herein, we report a fiber-shaped composite cathode with collaborative interface interactions to maintain electrode integrity and boost electrochemical performance. In this architecture, nanosulfur-polyvinylpyrrolidone (nanoS-PVP) particles are uniformly implanted into the few-layer TiCT with outstanding electrical conductivity and then coated on aluminum (Al) fiber current collectors. Impressively, nanoS and soluble polysulfides are restricted to the cathode side via synergy physical confinement and chemical adsorption of TiCT . The PVP chains on the surface of the nanoS prevent the sulfur from agglomeration and bridge the TiCT by abundant hydrogen bonds. The enhanced interface endows the cathode with excellent mechanical flexibility, good adsorption of polysulfides and fast reaction kinetics. Consequently, the prepared TiCT /nanoS-PVP@Al cathode exhibits excellent cycling performance (capacity retention of 92.8% after 1000 cycles at 1 C), high-rate capacity (556.2 mAh g at 2.0 C) and high linear capacity (22.9 mAh m). Additionally, the fiber-shaped Li-S battery works effectively under deformation and high/low-temperature conditions. It can be integrated into the fabric to power light emitting diodes or charge a smartphone wirelessly.
纤维状锂硫电池因其高理论比容量、柔韧性和可穿戴性，作为灵活的电源解决方案，在构建智能纺织品方面具有吸引力。然而，严重的界面问题，如阴极侧多硫化物的穿梭效应，导致电池容量衰减和寿命较短。在此，我们报道了一种具有协同界面相互作用的纤维状复合阴极，以保持电极完整性并提高电化学性能。在这种结构中，纳米硫-聚乙烯吡咯烷酮（nanoS-PVP）颗粒均匀地植入到具有出色导电性的几层TiCT中，然后涂覆在铝（Al）纤维集流体上。令人印象深刻的是，通过TiCT的协同物理限制和化学吸附，纳米硫和可溶性多硫化物被限制在阴极侧。纳米硫表面的PVP链防止硫团聚，并通过大量氢键连接TiCT。增强的界面赋予阴极优异的机械柔韧性、对多硫化物的良好吸附和快速反应动力学。因此，制备的TiCT /nanoS-PVP@Al阴极表现出优异的循环性能（在1C下1000次循环后容量保持率为92.8%）、高倍率容量（在2.0C下为556.2 mAh g）和高线性容量（22.9 mAh m）。此外，纤维状锂硫电池在变形以及高低温条件下均能有效工作。它可以集成到织物中为发光二极管供电或无线充电智能手机。
