Enhanced electrochemical performance of LiVPO4F/f-graphene composite electrode prepared via ionothermal process

Rangaswamy, Puttaswamy; Shetty, Vijeth Rajshekar; Suresh, Gurukar Shivappa; Mahadevan, Kittappa Malavalli; Nagaraju, Doddahalli H.

Enhanced electrochemical performance of LiVPO4F/f-graphene composite electrode prepared via ionothermal process

Type

Article

Authors

Rangaswamy, Puttaswamy
Shetty, Vijeth Rajshekar
Suresh, Gurukar Shivappa
Mahadevan, Kittappa Malavalli
Nagaraju, Doddahalli H.

KAUST Department

Physical Science and Engineering (PSE) Division

Online Publication Date

2016-10-13

Print Publication Date

2017-01

Date

2016-10-13

Abstract

Abstract: In this article, we report the synthesis of 1,2-dimethyl-3-(3-hydroxypropyl) imidazolium dicyanamide ionic liquid and its used as a reaction medium for low-temperature synthesis of triclinic LiVPOF electrode material. Structural and morphological features of LiVPOF were characterized using X-ray diffraction and scanning electron microscopy techniques. The electrochemical studies have been investigated using cyclic voltammetry, galvanostatic charge/discharge studies, and electrochemical impedance spectroscopic techniques. The ionothermally obtained LiVPOF is modified to LiVPOF/f-graphene composite electrode to obtain high specific capacity, better rate performance, and longer cycle life. Even after 250 cycles, the LiVPOF/f-graphene composite electrode exhibited a specific capacity more than 84 % with good reversible de-intercalation/intercalation of Li-ions. This article also provides the comparative electrochemical performances of LiVPOF/f-graphene composite, LiVPOF/carbon, and LiVPOF/graphene composite electrodes in a nonaqueous rechargeable Li-ion battery system. Graphical Abstract: [Figure not available: see fulltext.]

Citation

Rangaswamy P, Shetty VR, Suresh GS, Mahadevan KM, Nagaraju DH (2016) Enhanced electrochemical performance of LiVPO4F/f-graphene composite electrode prepared via ionothermal process. Journal of Applied Electrochemistry. Available: http://dx.doi.org/10.1007/s10800-016-1007-4.