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Towards high capacity Li-ion batteries based on silicon-graphene composite anodes and sub-micron V-doped LiFePO4 cathodes
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Loveridge, Melanie, Lain, Michael J., Johnson, I. D., Roberts, A. J. (Andrew J.), Beattie, Shane D., Dashwood, R. J., Darr, J. A. and Bhagat, Rohit (2016) Towards high capacity Li-ion batteries based on silicon-graphene composite anodes and sub-micron V-doped LiFePO4 cathodes. Scientific Reports, 6 . 37787. doi:10.1038/srep37787 ISSN 2045-2322.
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Official URL: http://dx.doi.org/10.1038/srep37787
Abstract
Lithium iron phosphate, LiFePO4 (LFP) has demonstrated promising performance as a cathode material in lithium ion batteries (LIBs), by overcoming the rate performance issues from limited electronic conductivity. Nano-sized vanadium-doped LFP (V-LFP) was synthesized using a continuous hydrothermal process using supercritical water as a reagent. The atomic % of dopant determined the particle shape. 5 at. % gave mixed plate and rod-like morphology, showing optimal electrochemical performance and good rate properties vs. Li. Specific capacities of >160 mAh g−1 were achieved. In order to increase the capacity of a full cell, V-LFP was cycled against an inexpensive micron-sized metallurgical grade Si-containing anode. This electrode was capable of reversible capacities of approximately 2000 mAh g−1 for over 150 cycles vs. Li, with improved performance resulting from the incorporation of few layer graphene (FLG) to enhance conductivity, tensile behaviour and thus, the composite stability. The cathode material synthesis and electrode formulation are scalable, inexpensive and are suitable for the fabrication of larger format cells suited to grid and transport applications.
| Item Type: | Journal Article | ||||||||
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| Subjects: | Q Science > QC Physics | ||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
| Library of Congress Subject Headings (LCSH): | Lithium cells, Electrochemical analysis | ||||||||
| Journal or Publication Title: | Scientific Reports | ||||||||
| Publisher: | Nature Publishing Group | ||||||||
| ISSN: | 2045-2322 | ||||||||
| Official Date: | 29 November 2016 | ||||||||
| Dates: |
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| Volume: | 6 | ||||||||
| Article Number: | 37787 | ||||||||
| DOI: | 10.1038/srep37787 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||||
| Date of first compliant deposit: | 16 February 2017 | ||||||||
| Date of first compliant Open Access: | 17 February 2017 | ||||||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC) | ||||||||
| Grant number: | EP/M009394/1(EPSRC) |
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