Carbon Wrapped Ni₃S₂ Nanocrystals Anchored on Graphene Sheets as Anode Materials for Lithium-Ion Battery and the Study on Their Capacity Evolution.
Carbon Wrapped Ni₃S₂ Nanocrystals Anchored on Graphene Sheets as Anode Materials for Lithium-Ion Battery and the Study on Their Capacity Evolution.
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DOI：
10.3390/nano8100760
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发表时间：
2018-09-26
期刊：
影响因子：
--
通讯作者：
Li H
中科院分区：
文献类型：
--
作者：
Guan X;Liu X;Xu B;Liu X;Kong Z;Song M;Fu A;Li Y;Guo P;Li H
采用喷雾混凝辅助水热法制备了Ni3S2纳米晶，并将其固定在还原氧化石墨烯（Ni3S2@C/RGO）表面。选择溶解于硫脲/氢氧化钠水溶液中的纤维素作为碳源，以石墨烯悬浮液为混凝浴，采用喷雾混凝法与氧化石墨烯混合。得到的纤维素/石墨烯悬浮液作为溶解Ni(NO3)2的溶剂，然后以水热法制备Ni3S2@C/RGO复合材料。研究了复合材料的结构，并对其作为锂离子电池负极材料的电化学性能进行了评价。Ni3S2@C/RGO样品在循环中表现出增加的可逆容量，并表现出优越的速率性能。这些有希望的性能归因于碳层的包裹作用，它限制了循环形成的多晶的位错，以及RGO导电衬底的集成增强了导电性。在200和5000 mA·g−1的电流密度下，分别获得了850和630 mAh·g−1的放电容量。通过非原位透射电镜（ex-situ TEM）和x射线衍射（XRD）测试，揭示了复合材料的电化学性能随封装Ni3S2纳米晶结构的变化而变化。
Ni3S2 nanocrystals wrapped by thin carbon layer and anchored on the sheets of reduced graphene oxide (Ni3S2@C/RGO) have been synthesized by a spray-coagulation assisted hydrothermal method and combined with a calcination process. Cellulose, dissolved in Thiourea/NaOH aqueous solution is chosen as carbon sources and mixed with graphene oxide via a spray-coagulation method using graphene suspension as coagulation bath. The resulted cellulose/graphene suspension is utilized as solvent for dissolving of Ni(NO3)2 and then used as raw materials for hydrothermal preparation of the Ni3S2@C/RGO composites. The structure of the composites has been investigated and their electrochemical properties are evaluated as anode material for lithium-ion batteries. The Ni3S2@C/RGO sample exhibits increasing reversible capacities upon cycles and shows a superior rate performance as well. Such kinds of promising performance have been ascribed to the wrapping effect of carbon layer which confines the dislocation of the polycrystals formed upon cycles and the enhanced conductivity as the integration of RGO conductive substrate. Discharge capacities up to 850 and 630 mAh·g−1 at current densities of 200 and 5000 mA·g−1, respectively, are obtained. The evolution of electrochemical performance of the composites with structure variation of the encapsulated Ni3S2 nanocrystals has been revealed by ex-situ TEM and XRD measurements.
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