黑磷烯改性膜的制备及其锂硫电池性能

Preparation of black phosphorene-modified separator and its lithiumsulfur battery performance

锂硫电池因其高能量密度、低成本、无毒性等优点,在电池领域备受瞩目,被认为是最具有开发潜力的电池之一。但锂硫电池的应用一直受到容量衰减严重的困扰,这主要源自于多硫化物的严重穿梭效应。为解决这个问题,通过合成黑磷烯对商用聚丙烯隔膜进行改性,探究黑磷烯对锂硫电池性能的影响。结果发现,黑磷烯与商用隔膜具有良好的粘附性,改性后提高了隔膜吸液率,加快了离子在电解液中的扩散,有效抑制了穿梭效应。黑磷烯改性隔膜的锂硫电池在0.05 C下的首次放电比容量可达943 mAh/g,且在0.1 C下稳定循环超过200次,电池的性能得到显著提升。

Lithium-sulfur batteries have attracted significant attention in the field of batteries due to their high energy density,low cost,and non-toxicity,making them one of the most promising battery technologies.However,the application of lithium-sulfur batteries has been plagued by serious capacity fading primarily stemming from the pronounced shuttle effect of polysulfides.To address this issue,this study synthesized black phosphorus nanosheets to modify commercial polypropylene separators and investigate the impact of black phosphorus on the performance of lithium-sulfur batteries.The results reveal that black phosphorus exhibits excellent adhesion to the commercial separator,and the modification increases the liquid absorption of the separator,accelerating ion diffusion in the electrolyte and effectively suppressing the shuttle effect.The lithium-sulfur battery with the black phosphorene-modified separator achieves an initial discharge specific capacity of 943 mAh/g at 0.05 C,and demonstrates stable cycling performance exceeding 200 cycles at 0.1 C,leading to a significant enhancement in battery performance.