Designing Urchin ‐Like S@SiO2 with Regulated Pores Toward Ultra‐Fast Room Temperature Sodium–Sulfur Battery

Through the effective regulation of pore sizes, a series of S@SiO2 cathode materials are obtained. Benefitting from the abundant pore channels of SiO2 particles, the sulfur loading is as high as 76.3%. Importantly, a suitable pore size can lead to adequate reaction and rapid diffusion behaviors, resulting in excellent electrochemical performances. AbstractCaptured by high theoretical capacity and low-cost, Sodium –Sulfur (Na-S) batteries have been deemed as promising energy-storage systems. However, their electrochemical properties, containing both cycling and rate properties, still suffer from the notorious “shuttle effect” of polysulfide. Herein, through the effective regulation of pore sizes, a seri es of S@SiO2 cathode materials are obtained. Benefitting from the abundant pore channels of SiO2 particles, the sulfur loading is as high as 76.3%. Importantly, a suitable pore size can lead to adequate reaction and rapid diffusion behaviors, resulting in excellent electrochemical performances. Specifically, at 2.0  A g−1, the initial capacity of the as-optimized sample can be up to 1370.6  mAh g−1. Surprisingly, even after 1050 cycles, it could achieve a high reversible capacity of 1280.8  mAh g−1 with an attenuation rate of 0.089%. At 5.0  A g−1, after 500 cycles, the capacity can still remain ≈ 1132.6 mAh g−1 (capacity retention rate, 97.5%). Given this, the work is anticipated to offer an effective strategy for advanced electrodes for Na-S batter...

Source: Small - April 4, 2024 Category: Nanotechnology Authors: Xi Wang, Zihao Zeng, Zeyu Dong, Peng Ge, Yue Yang Tags: Research Article Source Type: research