一步法制备超薄NiS_石墨烯复合材料及储锂性能研究.doc

文档介绍：
一步法制备超薄 NiS/石墨烯复合材料及储
锂性能研究#
潘沁,谢健,刘双宇,曹高劭,朱铁军,赵新兵**
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(浙江大学材料科学与工程学系,杭州,310027)
摘要:以氧化石墨,四水醋酸镍,硫脲和柠檬酸三钠为原料,通过一步水热法制备超薄硫化
镍纳米片/石墨烯原位复合材料。水热反应过程中,硫化镍纳米片的生长与氧化石墨的还原
同时进行。SEM 与 TEM 研究表明,复合材料呈片片堆叠微观结构,NiS 超薄片层厚度小于
5nm,复合在多层(小于 8 层)石墨烯片上。由于这种独特的微观结构以及石墨烯的导电、
分散剂及约束作用,NiS/石墨烯复合材料表现出远优于纯 NiS 的电化学性能。
关键词:锂离子电池;NiS/石墨烯;水热合成
Facile one-pot synthesis of ultrathin NiS nanosheets
anchored on graphene and the improved electrochemical
Li-storage properties
PAN Qin1, XIE Jian2, LIU Shuangyu2, CAO Gaoshao2, ZHU Tiejun1, ZHAO
Xinbing2
(1. Departmetn of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027;
2. Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027)
Abstract: A NiS/graphene (NiS/G) nanohybrid has been synthesized by a facile in situ one-pot
hydrothermal route using graphite oxide, thiourea, Ni(CH3COO)2·4H2O and sodium citrate as the
raw materials. The growth of NiS nanosheets and the reduction of graphite oxide occur
simultaneously during the hydrothermal reactions. The hybrid exhibits a unique sheet-on-sheet
structure, where ultrathin NiS sheets (below 5 nm) are anchoring on few-layer (below 8 layers)
graphene sheets. The electrochemical measurements indicate that the NiS/G hybrid exhibits
remarkably improved Li-storage pared with bare NiS, due to the ultrathin feature of
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