High performance of selenium cathode by encapsulating selenium into the micropores of chitosan-derived porous carbon framework
High performance of selenium cathode by encapsulating selenium into the micropores of chitosan-derived porous carbon framework
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通过将硒封装到壳聚糖衍生的多孔碳框架的微孔中来实现高性能硒阴极
DOI：
10.1016/j.jallcom.2018.02.276
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发表时间：
2018-05
影响因子：
6.2
通讯作者：
Qiang Shen
中科院分区：
文献类型：
--
作者：
D;an Jia;Zewen Yang;He Zhang;Fenglin Liu;Qiang Shen
在高比表面积碳骨架的部分微孔中加入元素硒，可以同时缓冲体积变化和提高高性能锂-硒(Li-Se)电池正极用硒/碳复合材料的电子导电性。本文采用一步炭化/活化法制备了壳聚糖基多孔碳骨架，该骨架具有含氧、含氮的官能团，比表面积为2098.6 m~2g−~1，总孔体积为1.0 4 cm~3g−~1，微孔体积为0.62 cm~3g−~1。在0.1 C(1 C = 675 mA g−1)下，Se-50.2/CPC(Se ∼ 50.2 wt%)复合正极在第1次、第2次和第100次循环中的超高放电容量分别为801.2、673.1和633.9 mAhg−1。Se负载量的变化证明了剩余空穴对Se-50.2/CPC复合正极循环稳定性的正向缓冲作用，恒流循环下电荷转移电阻的减小解释了Se-50.2/CPC复合正极的高容量和高倍率性能。总之，将壳聚糖简单、低成本、高附加值地转化为多孔碳骨架，有望满足其在锂硒电池中的潜在应用。
Incorporating elemental selenium into parts of the micropores of a high surface area carbonaceous framework can simultaneously buffer volume variation and improve electronic conductivity of the resulting selenium/carbon composite for high-performance lithium-selenium (Li-Se) battery cathodes. In this paper, chitosan-derived porous carbon (CPC) framework has been constructed through a one-step carbonization/activation route, possessing oxygen- and nitrogen-containing functional groups and acquiring a high specific surface area of 2098.6 m2g−1, a total pore volume of 1.04 cm3g−1and a micropore volume of 0.62 cm3g−1. As a Li-Se battery cathode, at 0.1 C (1 C = 675 mA g−1) the composite cathode of Se-50.2/CPC (Se ∼ 50.2 wt%) delivers the ultrahigh discharge capacities of 801.2, 673.1 and 633.9 mAh g−1in the 1st, 2nd and 100th cycles, respectively. The change of Se-loading amount proves the volume-buffering positive effect of residual voids on the cycling stability of Se-50.2/CPC composite cathode, and the galvanostatic cycling-dependent decrease of charge-transfer resistance interprets its high-capacity feature and good rate capability. In a word, a facile, low-cost and value-added transformation of chitosan into porous carbon framework may satisfy its potential application in Li-Se batteries.
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