阳极
石墨烯
材料科学
电极
氧化物
锂(药物)
涂层
电化学
电流密度
电池(电)
纳米技术
图层(电子)
锂离子电池
化学工程
纳米结构
化学
冶金
医学
物理
量子力学
功率(物理)
物理化学
内分泌学
工程类
作者
Jinlong Wu,Junhao Liu,Zhi Wang,Xuzhong Gong,Yong Wang
标识
DOI:10.1016/j.cej.2019.03.253
摘要
Since most active nanoparticles (Si, Sn, TiO2, SnO2, etc.) are simply decorated on the graphene surface instead of being contained between the graphene nanoarray, they are easily peeled off during the long-term cycling. A new Si-based double jackets nanostructure synthesized by synergistic coupling of TiO2@RGO coating layer, supporting large current density for charge/discharge, is reported as an anode material for lithium-ion batteries. The new heterostructure modifies the surface of Si and TiO2 to ensure a firm bond between the interfaces, layer by layer self-assembly dispersed in the reduced graphene oxide ([email protected]2@RGO). Compared with the regular [email protected] composites, [email protected]2@RGO exhibits excellent electrochemical performance, mainly due to the strong interfacial binding force among the three, thus the integrity of the electrode structure is ensured in the lithiation/delithiation process. As a consequence, the [email protected]2@RGO electrode exhibits a stable reversible specific capacity of 1679.1 mAh g−1 at a large current density of 1.4 A g−1 after 900 cycles.
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