Engineering Laboratory for Next Generation Power and Energy Storage Batteries, and Engineering Laboratory for Functionalized Carbon Materials, Graduate School at Shenzhen, Tsinghua University , Shenzhen 518055, China.
School of Materials Science and Engineering, Tsinghua University , Beijing 100084, China.
ACS Appl Mater Interfaces. 2016 Sep 7;8(35):23105-13. doi: 10.1021/acsami.6b07487. Epub 2016 Aug 29.
Although lithium-sulfur (Li-S) batteries deliver high specific energy densities, lots of intrinsic and fatal obstacles still restrict their practical application. Electrospun carbon nanofibers (CNFs) decorated with ultrafine TiO2 nanoparticles (CNF-T) were prepared and used as a multifunctional interlayer to suppress the volume expansion and shuttle effect of Li-S battery. With this strategy, the CNF network with abundant space and superior conductivity can accommodate and recycle the dissolved polysulfides for the bare sulfur cathode. Meanwhile, the ultrafine TiO2 nanoparticles on CNFs work as anchoring points to capture the polysulfides with the strong interaction, making the battery perform with remarkable and stable electrochemical properties. As a result, the Li-S battery with the CNF-T interlayer delivers an initial reversible capacity of 935 mA h g(-1) at 1 C with a capacity retention of 74.2% after 500 cycles. It is believed that this simple, low-cost and scalable method will definitely bring a novel perspective on the practical utilization of Li-S batteries.
尽管锂硫（Li-S）电池具有高比能量密度，但许多内在的和致命的障碍仍然限制了它们的实际应用。制备了负载超细 TiO2 纳米颗粒的静电纺丝碳纳米纤维（CNF-T），并将其用作多功能中间层，以抑制 Li-S 电池的体积膨胀和穿梭效应。通过这种策略，具有丰富空间和优异导电性的 CNF 网络可以容纳和回收溶解的多硫化物，用于裸硫阴极。同时，CNFs 上的超细 TiO2 纳米颗粒作为锚定点，通过强相互作用捕获多硫化物，使电池表现出显著而稳定的电化学性能。结果，具有 CNF-T 中间层的 Li-S 电池在 1 C 时的初始可逆容量为 935 mA h g(-1)，经过 500 次循环后，容量保持率为 74.2%。相信这种简单、低成本且可扩展的方法将为 Li-S 电池的实际应用带来新的视角。
