High-yield fabrication of graphene-wrapped silicon nanoparticles for self-support and binder-free anodes of lithium-ion batteries
High-yield fabrication of graphene-wrapped silicon nanoparticles for self-support and binder-free anodes of lithium-ion batteries
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高产率制造石墨烯包裹的硅纳米粒子，用于锂离子电池自支撑和无粘合剂阳极
DOI：
10.1016/j.jallcom.2018.02.066
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发表时间：
2018-05
影响因子：
6.2
通讯作者：
He Deyan
中科院分区：
文献类型：
--
作者：
Yue Hongwei;Li Qun;Liu Dequan;Hou Xiaoyi;Bai Shuai;Lin Shumei;He Deyan
石墨烯包裹的硅纳米粒子（NP）复合材料是通过一锅液氮快速冷冻和热还原组装而成的。研究发现，作为自支撑、无粘合剂的锂离子电池负极，复合石墨烯有助于形成均匀的形貌，降低电极的电阻，并将Si纳米粒子与电解液隔离，抑制不稳定固体电解质界面的形成。此外，它可以缓冲硅纳米颗粒体积变化带来的应变。具有优化的还原氧化石墨烯（rGO）与Si NP质量比的复合材料表现出显着改善的锂存储性能，具有优异的倍率性能和在210mAg−1的电流密度下经过300次循环后可逆容量为1482mAh g−1。此外，还深入研究了rGO/Si复合材料的电化学反应动力学和界面行为。这里报告的工作可以扩展到其他石墨烯基材料的制造。
Composites of graphene-wrapped Si nanoparticles (NPs) have been assembledviaa one-pot liquid nitrogen fast freezing followed by a thermal reduction. It is found that, as a self-support and binder-free anode of lithium-ion battery, the composited graphene is helpful to form a uniform morphology, reduce the resistance of the electrode and isolate the Si NPs from the electrolyte to suppress the formation of unstable solid electrolyte interphase. Moreover, it can buffer the strain from the volume change of the Si NPs. The composite with an optimized mass ratio of reduced graphene oxide (rGO) to Si NPs exhibits significantly improved lithium storage performance with an excellent rate capability and a large reversible capacity of 1482 mAh g−1at a current density of 210 mA g−1after 300 cycles. Furthermore, the electrochemical reaction kinetics and interfacial behavior of the rGO/Si composites are investigated in-depthly. The work reported here can be extended to the fabrication of the other graphene-based materials.
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