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首页> 外文期刊>International Journal of Electrochemical Science >Well-dispersed Amorphous Ta2O5 Chemically Grafted onto Multi-Walled Carbon Nanotubes for High-performance Lithium Sulfur Battery
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Well-dispersed Amorphous Ta2O5 Chemically Grafted onto Multi-Walled Carbon Nanotubes for High-performance Lithium Sulfur Battery

机译：化学接枝到高性能锂硫电池多壁碳纳米管上的均匀分散的Ta 2 O 5 非晶态

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Modification of commercial separators with conductive and active barrier layers towards solublepolysulfides is an effective way to combat the shuttle effect and improve the utilization rate of sulfur inlithium-sulfur (Li-S) batteries. Herein, well-dispersed amorphous Ta 2 O 5 was chemically grafted ontooxidized multi-walled carbon nanotubes (CNT-O) under mild conditions by a one-pot solventevaporation method. The prepared Ta 2 O 5 /CNT-O composite was used as a modified separator layer in aLi-S battery, which combined the advantages of the intertwined structure of conductive CNT-O and thechemisorption ability of Ta 2 O 5 . Cyclic voltammetry (CV) curves and X-ray photoelectron spectroscopy(XPS) verified the catalytic effect of Ta 2 O 5 on the redox reactions during the discharge/charge processesand the strong chemical interactions between polysulfides and Ta 2 O 5 . Scanning electron microscopy(SEM) images of the modified separators after cycling revealed that the well-dispersed amorphous Ta 2 O 5could immobilize soluble polysulfides through chemical interactions and prevent aggregation of theinsoluble products (Li 2 S 2 , LiS 2 and S 8 ) during the redox reactions, leading to a uniform redistribution ofthe sulfur species inside the modification layer, which could ensure the conductivity of the modificationlayer and high utilization rate of sulfur during long-term cycling processes. A Li-S cell prepared withTa 2 O 5 /CNT-O modified separator exhibited a high initial specific capacity of 1230.7 mAh/g at a currentdensity of 0.2 C and stable cycle performance with a decay rate of only 0.11% per cycle over 500discharge/charge cycles.
机译：将具有导电和有源阻挡层的商业隔板改制成可溶多硫化物是对抗穿梭效应并提高硫锂硫（Li-S）电池利用率的有效方法。在此，通过一锅溶剂蒸发法在温和条件下将分散良好的非晶态Ta 2 O 5化学接枝到氧化的多壁碳纳米管（CNT-O）上。所制备的Ta 2 O 5 / CNT-O复合材料被用作锂电池的隔离层，兼具导电CNT-O的缠结结构和Ta 2 O 5的化学吸附能力。循环伏安法（CV）曲线和X射线光电子能谱（XPS）证明了Ta 2 O 5在放电/充电过程中对氧化还原反应的催化作用以及多硫化物与Ta 2 O 5之间的强化学相互作用。循环后，改性隔板的扫描电子显微镜图像显示，分散良好的无定形Ta 2 O 5可以通过化学相互作用固定可溶性多硫化物，并防止不溶性产物（Li 2 S 2，LiS 2和S 8）聚集。氧化还原反应，导致改性层内硫种类的均匀重新分布，可以确保改性层的导电性和长期循环过程中硫的高利用率。用Ta 2 O 5 / CNT-O修饰的隔膜制备的Li-S电池在0.2 C的电流密度下表现出较高的初始比容量1230.7 mAh / g，并且具有稳定的循环性能，在500次放电/放电后每个循环的衰减率仅为0.11％充电周期。

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