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首页> 外文期刊>RSC Advances >MoO2 nanoparticles embedded in N-doped hydrangea-like carbon as a sulfur host for high-performance lithium–sulfur batteries
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MoO2 nanoparticles embedded in N-doped hydrangea-like carbon as a sulfur host for high-performance lithium–sulfur batteries

机译：MOO2纳米颗粒嵌入N掺杂的绣质类碳中，作为高性能锂 - 硫电池的硫磺宿主

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Lithium–sulfur batteries are considered to be promising energy storage devices owing to their high energy density, relatively low price and abundant resources. However, the low utilization of insulated active materials and shuttle effect have severely hindered the further development of lithium–sulfur batteries. Herein, MoO _(2) nanoparticles embedded in N-doped hydrangea-like carbon have been synthesized by liquid-phase reaction followed by an annealing process and used as a sulfur host. The nitrogen-doped carbon matrix improves electrical conductivity and provides pathways for smooth electron and Li ion transfer to uniformly dispersed sulfur. Meanwhile, MoO _(2) nanoparticles can absorb polysulfide ions by forming strong chemical bonds, which can effectively alleviate the polysulfide shuttling effect. These results showed a good rate performance: 1361, 1071, 925, 815 and 782 mA h g ~(?1) at the current densities of 0.1, 0.2, 0.5, 1 and 2 A g ~(?1) , and capacity retention of 85% after 300 cycles at 1 A g ~(?1) . The excellent performance was due to the synergistic effects of the polar MoO _(2) and nitrogen-doped carbon matrix, which can effectively restrain and reutilize active materials by absorbing polysulfides and catalyzing the transformation of polysulfides.
机译：由于其高能量密度，相对低的价格和丰富资源，锂 - 硫磺电池被认为是有前途的能量存储装置。然而，绝缘活性材料和梭效应的低利用率严重阻碍了锂 - 硫电池的进一步发展。这里，通过液相反应合成了嵌入N掺杂绣旋碳的MOO _（2）纳米颗粒，然后通过液相反应合成，然后用退火工艺合成并用作硫宿主。氮掺杂的碳基质提高了电导率，并为平滑电子和锂离子转移提供了途径以均匀分散的硫。同时，MOO _（2）纳米颗粒可以通过形成强化学键来吸收多硫化物离子，这可以有效地减轻多硫化物穿梭效果。这些结果显示出良好的速率性能：在0.1,0.2,0.5,1和2A G〜（α1）的电流密度下，1361,1071,925,815和782mA Hg〜（α1）和容量保留300次循环以1a g〜（？1）后85％。优异的性能是由于极性MOO _（2）和氮掺杂碳基质的协同效应，这可以通过吸收多硫化物和催化多硫化物的转化来有效地抑制和重新利用活性材料。

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