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首页> 外文期刊>Advanced Functional Materials >Vacuum Calcination Induced Conversion of Selenium/Carbon Wires to Tubes for High-Performance Sodium-Selenium Batteries
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Vacuum Calcination Induced Conversion of Selenium/Carbon Wires to Tubes for High-Performance Sodium-Selenium Batteries

机译：真空煅烧诱导的硒/碳丝向高性能钠-硒电池管的转化

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摘要

A vacuum calcination approach is developed to fabricate selenium/carbon composites, which does not require intensive mixing and durable heating such as in commonly used melt-infusion methods of loading selenium into carbon hosts. Starting from carbon-coated selenium wires prepared via a wet-chemical reaction, selenium/carbon tubes are fabricated by a straightforward calcination process. The calcination is conducted in a confined space to reduce the insulating carbon shell under vacuum, and selenium melts but remains a constituting part of the composite. Paired with sodium metal anode, the resultant selenium/carbon tubes deliver a high reversible capacity of 601 and 509 mA h g(-1) at 0.2 and 2 C normalized by the mass of selenium, which corresponds to energy and power densities of 860 and 667 Wh kg(-1) at 193 and 1770 W kg(-1), respectively. Such capacity and rate performance surpasses most typical cathode materials for lithium or sodium (ion) batteries, according to the comparative literature analysis. Moreover, the robust tubular-like hollow structure of the selenium/carbon composites ensures for impressive capacity retention of more than 90% after 1000 cycles at 20 C.
机译：开发了一种真空煅烧方法来制造硒/碳复合材料，这种方法不需要强烈混合和持久加热，例如在将硒加载到碳主体中的常用熔融注入方法中。从通过湿化学反应制备的碳包覆硒线开始，硒/碳管通过简单的煅烧工艺制造。在有限的空间内进行煅烧以减少真空下的绝缘碳壳，硒熔化但仍是复合材料的组成部分。与钠金属阳极配对，所得的硒/碳管在0.2和2 C时可实现高可逆容量601和509 mA hg（-1），该硒和硒的质量归一化，这对应于860和667的能量和功率密度Wh kg（-1）分别为193和1770 W kg（-1）。根据比较文献分析，这种容量和倍率性能超过了锂或钠（离子）电池最典型的正极材料。此外，硒/碳复合材料的坚固管状空心结构可确保在20 C下进行1000次循环后，可保持90％以上的出色容量保持率。

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