石墨烯
材料科学
化学工程
介孔材料
锂(药物)
X射线光电子能谱
高分辨率透射电子显微镜
拉曼光谱
碳纤维
电化学
阴极
纳米技术
复合数
复合材料
透射电子显微镜
电极
化学
有机化学
物理化学
催化作用
内分泌学
工程类
物理
光学
医学
作者
Xufeng Wang,Zhijun Feng,Juntong Huang,Wen Deng,Xibao Li,Huasen Zhang,Zhenhai Wen
出处
期刊:Carbon
[Elsevier]
日期:2018-02-01
卷期号:127: 149-157
被引量:202
标识
DOI:10.1016/j.carbon.2017.10.101
摘要
Nanohybrids of graphene-decorated carbon-coated LiFePO4 nanospheres are prepared using a ball milling-assisted rheological phase method combined with a solid-state reaction. The hybrids are characterized by XRD, SEM, TEM, HRTEM, XPS, Raman and TGA, and their electrochemical properties are studied by CV, EIS and galvanostatic charge-discharge. The experimental results exhibit that multilayer graphene films are decorating carbon-coated LiFePO4 nanospheres without stacking, which results in an abundance of mesopores constituting a unique 3D “sheets-in-pellets” and “pellets-on-sheets” conducting network structure. This structure highlights the improvements of the rate and cyclic performance as a cathode material for lithium-ion batteries, because the highly conductive and plentiful mesopores promote electronic and ionic transport. As a result, the hybrids with approximately 3 wt% graphene exhibit an outstanding rate capability with an initial discharge capacity of 163.8 and 147.1 mA h g−1 at 0.1 C and 1 C, and the capacity is retained at 81.2 mA h g−1 even at 20 C. Moreover, the composites also reveal an excellent cycling stability with only an 8% capacity decay at 10 C after 500 cycles.
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