High-index faceted nickel ferrite nanocrystals encapsulated by graphene with high performance for lithium-ion batteries
High-index faceted nickel ferrite nanocrystals encapsulated by graphene with high performance for lithium-ion batteries
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石墨烯封装的高折射率多面镍铁氧体纳米晶，用于锂离子电池高性能
DOI：
10.1016/j.electacta.2017.10.040
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发表时间：
2017-12
影响因子：
6.6
通讯作者：
Li Qiuhong
中科院分区：
文献类型：
--
作者：
Tong Xiaobin;Zhao Longze;Lin Xiaoping;Pan Xi;Zhang Jianmin;Duan Xiaochuan;Li Qiuhong
合成了均匀的八面体石墨烯包裹镍铁氧体(GNFO)纳米晶，并用扫描电子显微镜、透射电子显微镜、X射线衍射仪和X射线光电子能谱分析技术对其进行了表征，结果表明：NiFe2O4纳米晶被高折射率的(111)面包裹，并被还原的石墨烯氧化物片层包裹。将GNFO纳米复合材料应用于锂离子电池负极，表现出优异的电化学性能。该电极在0.1A/−1下循环30次后仍保持1275mAhg−1的可逆容量，在1Ag−1下循环250次后的可逆容量可达937mAhg−1。此外，该电极还具有显著的倍率性能，在10.0A/g−1时的比容量仍保持在312mAhg−1。
Uniform octahedral nickel ferrite nanocrystals wrapped by graphene (GNFO) have been synthesized and characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy analysis techniques, which reveal that the NiFe2O4nanocrystals are enclosed by high index (111) facets and encapsulated by reduced graphene oxide sheets. When applied as anode electrodes for lithium ion batteries, GNFO nanocomposites present excellent electrochemical performances. The electrode maintains 1275 mAh g−1after 30 cycles at 0.1 A g−1and a reversible capacity up to 937 mAh g−1after 250 cycles at 1 A g−1. A prominent rate capability is also obtained and the specific capacity remains 312 mAh g−1at 10.0 A g−1. The superior electrochemical properties could benefit from open surface structure of octahedral NiFe2O4and synergistic effect between graphene and NiFe2O4, which shows promising applications in lithium-ion storage devices.
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