Chen Shaojie, Zhang Jingxuan, Wang Zeyu, Nie Lu, Hu Xiangchen, Yu Yi, Liu Wei
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.
Nano Lett. 2021 Jun 23;21(12):5285-5292. doi: 10.1021/acs.nanolett.1c01422. Epub 2021 Jun 2.
Lithium-sulfur batteries have ultrahigh theoretical energy densities, which makes them one of the most promising next-generation energy storage systems. However, it is still difficult to achieve large-scale commercialization because of the severe lithium polysulfide (LiPS) shuttle effect and low sulfur loading. Here, we report a flexible lithium-sulfur battery of a high sulfur loading with the assistance of NiCoO nanofiber array grown carbon cloth. The NiCoO nanofibers are ideal electrocatalysts for accelerating LiPS conversion kinetics through strong chemical interactions. Therefore, the composite cathode delivers a high specific capacity of 1280 mAh g at 0.2 C with a sulfur loading of 3.5 mg cm, and it can maintain a high specific capacity of 660 mAh g after 200 cycles, showing a good cycle stability. The "layer-by-layer" stacking strategy enables the Li-S battery with a high S loading of ∼9.0 mg cm to deliver a high areal capacity of 8.9 mAh cm.
锂硫电池具有超高的理论能量密度，这使其成为最有前景的下一代储能系统之一。然而，由于严重的多硫化锂（LiPS）穿梭效应和低硫负载量，实现大规模商业化仍然困难。在此，我们报道了一种借助生长在碳布上的NiCoO纳米纤维阵列辅助的高硫负载柔性锂硫电池。NiCoO纳米纤维是通过强化学相互作用加速LiPS转化动力学的理想电催化剂。因此，复合阴极在0.2 C、硫负载量为3.5 mg cm时具有1280 mAh g的高比容量，并且在200次循环后仍可保持660 mAh g的高比容量，显示出良好的循环稳定性。“逐层”堆叠策略使硫负载量约为9.0 mg cm的锂硫电池能够提供8.9 mAh cm的高面积容量。
