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- Title
Ionothermal synthesis and rate performance studies of nanostructured LiV(PO)/C composites as cathode materials for lithium-ion batteries.
- Authors
Li, Xueliang; He, Wenxiang; Xiao, Zhenghui; Peng, Fangfang; Chen, Jiejie
- Abstract
Various structures and morphologies of LiV(PO) precursors are synthesized by a novel ionothermal method using three kinds of imidazolium-based ionic liquids as both reaction mediums and structure-directing agents at ambient pressure. Nanostructured LiV(PO)/C cathode materials can be successfully prepared by a subsequent short calcination process. The structures, morphologies, and electrochemical properties are characterized by X-ray diffractometry, thermogravimetry, scanning and transmission electron microscopy, charge-discharge test, cyclic voltammetry, and electrochemical impedance spectroscopy. It shows that three kinds of materials synthesized present different morphologies and particle sizes. The result can be due to imidazolium-based ionic liquids, which combined with different anions play important role in forming the size and morphology of LiV(PO) material. These materials present excellent performance with high rate capacity and cycle stability. Especially, the LiV(PO)/C material prepared in 1-ethyl-3-methylimadozolium trifluoromethanesulfonate ([emim][OTf]) can deliver discharge capacities of 127.4, 118.9, 105.5, and 92.8 mAh g in the voltage range of 3.0-4.3 V at charge-discharge rate of 0.1, 1, 10, and 20 C after 50 cycles, respectively. The excellent rate performance can be attributed to the uniform nanostructure, which can make the lithium-ion diffusion and electron transfer more easily across the LiV(PO)/electrolyte interfaces.
- Subjects
CATHODES; LITHIUM-ion batteries; IMPEDANCE spectroscopy; THERMOGRAVIMETRY; X-ray diffractometers
- Publication
Journal of Solid State Electrochemistry, 2013, Vol 17, Issue 7, p1991
- ISSN
1432-8488
- Publication type
Article
- DOI
10.1007/s10008-013-2056-9