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首页> 外文期刊>International Journal of Electrochemical Science >Synergetic Protection Hollow Silicon by Nitrogen-Doped Carbon/Reduced Graphene Oxide to Improve the Electrochemical Stability as Lithium-Ion Battery Anode
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Synergetic Protection Hollow Silicon by Nitrogen-Doped Carbon/Reduced Graphene Oxide to Improve the Electrochemical Stability as Lithium-Ion Battery Anode

机译：氮掺杂碳/氧化石墨烯协同保护空心硅，提高锂离子电池负极的电化学稳定性

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摘要

Silicon is the most sought-after candidates for next-generation electrode materials for high energydensity lithium ion battery because of its high theoretical capacity and appropriate working potential.However, it still suffers from dramatic volume expansion/shrinkage during repeat discharge/chargeprocess, along with unstable solid electrolyte interface films, which largely degrade its practicalapplication. To overcome these problems, we present an approach to synthesize hollowsilicon@nitrogen-doped carbon/reduced graphene oxide (H-Si@N-C/rGO) composite viapolymerization coating with dopamine on hollow Si and hydrothermal with graphene oxide followed bythermal reduction. The hollow structure of Si and intragranular voids between the Si nanoparticlessignificantly relief the volume change during lithiation/delithiation process. The synergetic protectingof nitrogen-doped carbon/reduced graphene oxide also improves the stability of surface of silicon. As aresult, the H-Si@N-C/rGO composite delivers initial reversible capacity of 818 mAh g -1 with retains92% of initial capacity after 100 cycles at a current density of 0.2 A g -1 , and also displays stable cyclingperformance at a high current density of 1 A g -1 .
机译：硅因其高理论容量和适当的工作潜力而成为高能量密度锂离子电池下一代电极材料的最抢手候选者，但是在反复放电/充电过程中，硅仍会遭受体积急剧膨胀/收缩的困扰。不稳定的固体电解质界面膜，大大降低了其实际应用。为了克服这些问题，我们提出了一种通过在空心Si上用多巴胺进行聚合涂层并在氧化石墨烯上进行水热，然后进行热还原的方法来合成空心硅@氮掺杂的碳/氧化石墨烯（H-Si @ N-C / rGO）复合材料。 Si的中空结构和Si纳米颗粒之间的晶内空隙显着缓解了锂化/脱锂过程中的体积变化。氮掺杂碳/氧化石墨烯的协同保护也提高了硅表面的稳定性。因此，H-Si @ NC / rGO复合材料的初始可逆容量为818 mAh g -1，在电流密度为0.2 A g -1的情况下经过100次循环后仍保持初始容量的92％，并且在高电流下也显示出稳定的循环性能。电流密度为1 A g -1。

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