Novel iron-cobalt derivatised lithium iron phosphate nanocomposite for lithium ion battery cathode

Ikpo, COJafta, CJOzoemena, KIWest, NNjomo, NJahed, NBaker, PGIwuoha, EI2013-09-302013-09-302013-01Ikpo, C.O, Jafta, C.J, Ozoemena, K.I, West, N, Njomo, N, Jahed, N, Baker, P.G, and Iwuoha, E.I. 2013. Novel iron-cobalt derivatised lithium iron phosphate nanocomposite for lithium ion battery cathode. International Journal of Electrochemical Science, vol. 8, pp 753-7721452-3981http://www.electrochemsci.org/papers/vol8/80100753.pdfhttp://hdl.handle.net/10204/6973Copyright: 2013 Electrochemical Science Group. This is an Open Access journal. This journal authorizes the publication of the information herewith contained.Published in International Journal of Electrochemical Science, vol. 8, pp 753-772Described herein is the electrochemical study conducted on lithium ion battery cathode material consisting of composite of lithium iron phosphate (LiFePO(sub4), iron-cobalt derivatised carbon nanotubes (FeCo-CNT) and polyaniline (PA) nanomaterials (LiFePO4/FeCoCNT-PA); and pristine LiFePO(sub4). The design of the nanocomposite electrode involves first, the attachment of FeCo nanoparticles unto the nanotubes matrix via in situ reductive precipitation of the metal precursors within a CNT suspension. Results from High Resolution Transmission Electron Microscopy show the successful attachment of FeCo nanoparticles to the CNTs. The composite cathode exhibits better reversibility and kinetics than the pristine LiFePO4 due to the presence of the conductive additives in the former. This is demonstrated in the values of the diffusion coefficient (D) and standard rate constant (ks) determined through cyclic voltammetry. For the composite cathode D = 1.0 x 10(sup-9) cm(sup2) s(sup-1) and k(subs) = 7.05 x 10(sup-7) cm s(sup-1) whereas the pristine electrode has values of 4.81 x 10(sup-11) cm(sup2) s(sup-1) and 2.68 x 10(sup-7) cm s(sup-1) for D and k(subs), respectively. Similar trend is observed in the results obtained from electrochemical impedance spectroscopy.enLithium iron phosphate composite cathodeCarge-discharge reversibilityKlingler and Kochi equationStandard rate constantLithium ion diffusionNovel iron-cobalt derivatised lithium iron phosphate nanocomposite for lithium ion battery cathodeArticleIkpo, C., Jafta, C., Ozoemena, K., West, N., Njomo, N., Jahed, N., ... Iwuoha, E. (2013). Novel iron-cobalt derivatised lithium iron phosphate nanocomposite for lithium ion battery cathode. http://hdl.handle.net/10204/6973Ikpo, CO, CJ Jafta, KI Ozoemena, N West, N Njomo, N Jahed, PG Baker, and EI Iwuoha "Novel iron-cobalt derivatised lithium iron phosphate nanocomposite for lithium ion battery cathode." (2013) http://hdl.handle.net/10204/6973Ikpo C, Jafta C, Ozoemena K, West N, Njomo N, Jahed N, et al. Novel iron-cobalt derivatised lithium iron phosphate nanocomposite for lithium ion battery cathode. 2013; http://hdl.handle.net/10204/6973.TY - Article AU - Ikpo, CO AU - Jafta, CJ AU - Ozoemena, KI AU - West, N AU - Njomo, N AU - Jahed, N AU - Baker, PG AU - Iwuoha, EI AB - Described herein is the electrochemical study conducted on lithium ion battery cathode material consisting of composite of lithium iron phosphate (LiFePO(sub4), iron-cobalt derivatised carbon nanotubes (FeCo-CNT) and polyaniline (PA) nanomaterials (LiFePO4/FeCoCNT-PA); and pristine LiFePO(sub4). The design of the nanocomposite electrode involves first, the attachment of FeCo nanoparticles unto the nanotubes matrix via in situ reductive precipitation of the metal precursors within a CNT suspension. Results from High Resolution Transmission Electron Microscopy show the successful attachment of FeCo nanoparticles to the CNTs. The composite cathode exhibits better reversibility and kinetics than the pristine LiFePO4 due to the presence of the conductive additives in the former. This is demonstrated in the values of the diffusion coefficient (D) and standard rate constant (ks) determined through cyclic voltammetry. For the composite cathode D = 1.0 x 10(sup-9) cm(sup2) s(sup-1) and k(subs) = 7.05 x 10(sup-7) cm s(sup-1) whereas the pristine electrode has values of 4.81 x 10(sup-11) cm(sup2) s(sup-1) and 2.68 x 10(sup-7) cm s(sup-1) for D and k(subs), respectively. Similar trend is observed in the results obtained from electrochemical impedance spectroscopy. DA - 2013-01 DB - ResearchSpace DP - CSIR KW - Lithium iron phosphate composite cathode KW - Carge-discharge reversibility KW - Klingler and Kochi equation KW - Standard rate constant KW - Lithium ion diffusion LK - https://researchspace.csir.co.za PY - 2013 SM - 1452-3981 T1 - Novel iron-cobalt derivatised lithium iron phosphate nanocomposite for lithium ion battery cathode TI - Novel iron-cobalt derivatised lithium iron phosphate nanocomposite for lithium ion battery cathode UR - http://hdl.handle.net/10204/6973 ER -