Graphene-bonded and -encapsulated mesoporous TiO2 microspheres as a high-performance anode material for lithium ion batteries
Graphene-bonded and -encapsulated mesoporous TiO2 microspheres as a high-performance anode material for lithium ion batteries
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DOI：
10.1016/j.jpowsour.2015.04.086
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发表时间：
2015-08
影响因子：
9.2
通讯作者：
Zhiliang Xiu;Xiaopeng Hao;Yongzhong Wu;Qifang Lu;Suwen Liu
中科院分区：
文献类型：
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作者：
Zhiliang Xiu;Xiaopeng Hao;Yongzhong Wu;Qifang Lu;Suwen Liu
以氧化石墨烯（GO）和羟基乙酸钛微球（TGMs）为前驱体，在不使用任何交联剂的情况下，制备了石墨烯键合的介孔纳米TiO2微球（GMMs）。高度纳米多孔二氧化钛球生成通过原位水解的TGMs，然后包裹在其表面上通过共价键在回流过程中的GO纳米片。水热处理和Ar气氛下煅烧后，TiO 2的晶化和GO的还原同时显著增加。石墨烯修饰的介孔TiO2微球在比容量、倍率性能和循环稳定性等方面都有很大的提高。复合材料在10 C倍率下的放电容量为170 mA h g− 1，远高于原始TiO 2微球的放电容量（116 mA h g−1）。
A facile procedure are developed to fabricate graphene-bonded and -enwrapped mesoporous anatase TiO2microspheres (GMTMs) using graphene oxide (GO) and titanium glycolate microspheres (TGMs) as precursors without using any cross-linking reagents. Highly nanoporous TiO2spheres are generated via in situ hydrolysis of the TGMs and then wrapped by GO nanosheets over their surface through covalent linkage during a reflux process. After hydrothermal treatment and calcination in an Ar atmosphere, the crystallization of TiO2and the reduction of GO is significantly increased simultaneously. Electrochemical performance of the mesoporous TiO2microspheres (MTMs) enwrapped with chemically-bonded graphene is greatly improved in terms of specific capacity, rate capability and cycle stability. The composite material shows a discharge capacity of 170 mA h g−1at the 10 C rate, which is much higher than that of the pristine TiO2microspheres (116 mA h g−1).