An ultrafine V2O3 modified hierarchical porous carbon microsphere as a high performance cathode matrix for lithium–sulfur batteries
An ultrafine V2O3 modified hierarchical porous carbon microsphere as a high performance cathode matrix for lithium–sulfur batteries
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DOI：
10.1039/c6ra12687a
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发表时间：
2016-07
期刊：
影响因子：
3.9
通讯作者：
Ruwen Tang;Xueliang Li;Zhongqiang Ding;Luyao Zhang
中科院分区：
文献类型：
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作者：
Ruwen Tang;Xueliang Li;Zhongqiang Ding;Luyao Zhang
采用湿浸渍法制备了超细V2 O3改性炭微球（VCM），并将其用作锂硫电池正极材料。该复合材料呈现出中孔和微孔的分级多孔结构，有效地抑制了可溶性多硫化物并增强了传质。此外，V2 O3改性在这种单分散的微球材料可以捕获多硫化物和减轻损失的活性物质的化学吸附。S/VCM纳米复合材料显示出在0.5C下1177 mA h g−1的高初始放电容量和100次循环后921 mA h g−1的优异循环性能。在100次循环后，它仍然保持较高的倍率容量，分别为843和719 mA h g−1（1C和2C）。这些改进的电化学性能归因于分级孔和均匀分散的三氧化二钒的协同效应。
An ultrafine V2O3 modified carbon microsphere (VCM) was effectively prepared by a facile wet impregnation method and used as a cathode matrix for lithium–sulfur batteries. This resulting composite presents hierarchical porous frameworks of mesopores together with micropores, effectively restrains soluble polysulfides and enhances mass transport. Moreover, V2O3 modification in this mono-dispersed microsphere material can trap polysulfides and mitigate loss of active materials by chemical adsorption. The S/VCM nanocomposites show a high initial discharge capacity of 1177 mA h g−1 at 0.5C and an excellent cycling performance with 921 mA h g−1 after 100 cycles. And it still maintains higher rate capacities of 843 and 719 mA h g−1 at 1C and 2C, respectively, after 100 cycles. These improved electrochemical performances are attributed to the synergistic effects of hierarchical pores and uniformly dispersed vanadium trioxide.