Journal
ACS NANO
Volume 6, Issue 12, Pages 11035-11043Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn304725m
Keywords
Li-ion battery; titania; graphene; anode; nanocomposite
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Funding
- Zhejiang Provincial Natural Science Foundation of China [R4100194]
- National Natural Science Foundation of China [21201173]
- Key Research Program of the Chinese Academy of Sciences [KGZD-EW-202-4]
- 973 program [2011CB935900]
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A simple and scalable method is developed to synthesize TiO2/graphene nanostructured composites as high-performance anode materials for Li-ion batteries using hydroxyl titanium oxalate (HTO) as the intermediate for TiO2. With assistance of a surfactant, amorphous HTO can condense as a flower-like nanostructure on graphene oxide (GO) sheets. By calcination, the HTO/GO nanocomposite can be converted to TiO2/graphene nanocomposite with well preserved flower-like nanostructure. In the composite, TiO2 nanoparticles with an ultrasmall size of several nanometers construct the porous flower-like nanostructure which strongly attached onto conductive graphene nanosheets. The TiO2/graphene nanocomposite is able to deliver a capacity of 230 mA h g(-1) at 0.1 C (corresponding to a current density of 17 mA g(-1)), and demonstrates superior high-rate charge-discharge capability and cycling stability at charge/discharge rates up to 50 C in a half cell configuration. Full cell measurement using the TiO2/graphene as the anode material and spinel LiMnO2 as the cathode material exhibit good high-rate performance and cycling stability, indicating that the TiO2/graphene nanocomposite has a practical application potential in advanced Li-ion batteries.
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