Graphene Polyaniline/Polyoxometalate Hybrid As Cathode for Lithium Ion Batteries with Improved Lithium Storage Capacity

Abstract

: polyaniline/polyoxometalate nanospheres hybrid were synthesized via a facile interfacial polymerization method, and evaluated as a cathode material for lithium ion batteries. However, both polyoxometalate and polyaniline/polyoxometalate can be easily dissolved in LiPF6 eletroyte. In order to solve this problem，polyaniline/polyoxometalate nanospheres were first embedded into the interspaces of grapheme, leading to the formation 3D free-standing rGO@PANI/POM hybrid. The molecular cluster battery in which the RGO@PANI/PW12O34 hybrid was adopted as a cathode active material exhibited a higher battery capacity and stability than the PANI/ PW12O34 and the microcrystal polyoxometalate. The phosphotungstic acid polyanions not only exhibit a large theoretical capacity of about 260 mAh g−1, but also reduce the charge transfer resistance of electrode leading to the enhanced reversible capacity and rate capability. Reference [1] Liu, K.; Zheng, J. M.; Zhong, G. M.; Yang, Y. Poly(2,5-dihydroxy1,4-benzoquinonyl sulfide) (PDBS) as a Cathode Material for Lithium Ion Batteries. J. Mater. Chem. 2011, 5, 4125. [2] Shao, L.; Jeon, J. W.; Lutkenhaus, J. L. Polyaniline/Vanadium Pentoxide Layer-by-Layer Electrodes for Energy Storage. Chem. Mater. 2012,24, 181. [3] Zhang, L., Wu, H. B., & Lou, X. W. D. Iron-oxide-based advanced anode materials for lithium-ion Batteries . Advanced Energy Materials, 2014, 4, 1032. ACKNOWLEDGEMENTS This work was financially supported by the National Natural Science Foundation of China (Grant No. 21273195), a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions, and the Natural Science Foundation of Education Committee of Jiangsu Province (12KJB150023).