Electrocatalytic NiCo<sub>2</sub>O<sub>4</sub> Nanofiber Arrays on Carbon Cloth for Flexible and High-Loading Lithium-Sulfur Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 34076444.
- Also identified by DOI 10.1021/acs.nanolett.1c01422.
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Abstract
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 NiCo<sub>2</sub>O<sub>4</sub> nanofiber array grown carbon cloth. The NiCo<sub>2</sub>O<sub>4</sub> 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<sup>-1</sup> at 0.2 C with a sulfur loading of 3.5 mg cm<sup>-2</sup>, and it can maintain a high specific capacity of 660 mAh g<sup>-1</sup> 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<sup>-2</sup> to deliver a high areal capacity of 8.9 mAh cm<sup>-2</sup>.