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Transition metal alloy-modulated lithium manganese oxide nanosystem for energy storage in lithium-ion battery cathodes

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dc.contributor.author West, N
dc.contributor.author Ozoemena, KI
dc.contributor.author Ikpo, CO
dc.contributor.author Baker, PGL
dc.contributor.author Iwuoha, EI
dc.date.accessioned 2014-05-16T11:35:01Z
dc.date.available 2014-05-16T11:35:01Z
dc.date.issued 2013-07
dc.identifier.citation West, N, Ozoemena, K.I, Ikpo, C.O, Baker, P.G.L and Iwuoha, E.I. 2013. Transition metal alloy-modulated lithium manganese oxide nanosystem for energy storage in lithium-ion battery cathodes. Electrochimica Acta, vol. 101, pp 86-92 en_US
dc.identifier.issn 0013-4686
dc.identifier.uri http://ac.els-cdn.com/S0013468612019056/1-s2.0-S0013468612019056-main.pdf?_tid=523f59b8-dc3b-11e3-87d8-00000aab0f01&acdnat=1400163489_e77e0e41ba049f0ba557acb784ff4f55
dc.identifier.uri http://hdl.handle.net/10204/7412
dc.description Copyright: 2013 Elsevier. This is an ABSTRACT ONLY. The definitive version is published in Electrochimica Acta, vol. 101, pp 86-92 en_US
dc.description.abstract This paper explores the synergistic and catalytic properties of a newly developed lithium ion battery (LIB) composite cathode of LiMn(sub2)O(Sub4) modified with bimetallic (Au–Fe) nanoparticle. Spinel phase LiMn(sub)2O(sub4) was doped with bimetallic nanoparticles, LiM(subx)Mn(sub2-x)O(sub4) (M = FeAu), with concomitant oxidation of the Mn(sup3+) ions (responsible for LIB capacity loss) to Mn(sup4+). This nano-composite architecture accommodates the structural transformation that occurs during Li(sup+) ion charge and discharge. Ultra-low scan rate (0.01 mV s(sup-1) cyclic voltammetry of the pure LiMn(sub2)O(sub4) cathode material in 1 M LiPF(sub6)/electrolyte solution, showed two sets of redox peaks with a third observed at lower potentials for LiM(subx)Mn(sub2-x)O(sub4). The FeAu incorporation increased the reaction rate upon reduction of LiMn(sub2)O(sub4) as indicated by the enhanced reduction peak seen by cyclic voltammetry. Nyquist plots of the electrochemical impedance spectroscopy (EIS) results showed LiFeAu(subx)Mn(sub2-x)O(sub4) having increased conductivity with lower resistance of charge. X-ray diffraction studies showed the LiM(subx)Mn(sub2-x)O(sub4) material retained well-developed octahedral structures bounded by (111) planes. The material crystallite size was 10 nm with clear lattice fringes having a separation value of 0.48 nm which concurrently improved the diffusion rate of Li(sup+). Solid-state NMR results showed the progressive increase in average nominal manganese oxidation state from +3.5 to +4 resulted in an increase in the super-transferred hyperfine field at the (sup7)Li nucleus of the FeAu doped cathode material. The LiFeAu(subx)Mn(sub2-x)O(sub4) material also showed improved cycleability, especially at high C rate. This improvement was due to the enhanced physical stability of LiMn(sub2)O(sub4) and its improved electrical conductivity ascribed to the incorporated FeAu nanoparticles. en_US
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.relation.ispartofseries Workflow;12587
dc.subject Lithium-ion batteries en_US
dc.subject Cathode material en_US
dc.subject Nanomaterials en_US
dc.subject Doping en_US
dc.subject Charge transport en_US
dc.title Transition metal alloy-modulated lithium manganese oxide nanosystem for energy storage in lithium-ion battery cathodes en_US
dc.type Article en_US
dc.identifier.apacitation West, N., Ozoemena, K., Ikpo, C., Baker, P., & Iwuoha, E. (2013). Transition metal alloy-modulated lithium manganese oxide nanosystem for energy storage in lithium-ion battery cathodes. http://hdl.handle.net/10204/7412 en_ZA
dc.identifier.chicagocitation West, N, KI Ozoemena, CO Ikpo, PGL Baker, and EI Iwuoha "Transition metal alloy-modulated lithium manganese oxide nanosystem for energy storage in lithium-ion battery cathodes." (2013) http://hdl.handle.net/10204/7412 en_ZA
dc.identifier.vancouvercitation West N, Ozoemena K, Ikpo C, Baker P, Iwuoha E. Transition metal alloy-modulated lithium manganese oxide nanosystem for energy storage in lithium-ion battery cathodes. 2013; http://hdl.handle.net/10204/7412. en_ZA
dc.identifier.ris TY - Article AU - West, N AU - Ozoemena, KI AU - Ikpo, CO AU - Baker, PGL AU - Iwuoha, EI AB - This paper explores the synergistic and catalytic properties of a newly developed lithium ion battery (LIB) composite cathode of LiMn(sub2)O(Sub4) modified with bimetallic (Au–Fe) nanoparticle. Spinel phase LiMn(sub)2O(sub4) was doped with bimetallic nanoparticles, LiM(subx)Mn(sub2-x)O(sub4) (M = FeAu), with concomitant oxidation of the Mn(sup3+) ions (responsible for LIB capacity loss) to Mn(sup4+). This nano-composite architecture accommodates the structural transformation that occurs during Li(sup+) ion charge and discharge. Ultra-low scan rate (0.01 mV s(sup-1) cyclic voltammetry of the pure LiMn(sub2)O(sub4) cathode material in 1 M LiPF(sub6)/electrolyte solution, showed two sets of redox peaks with a third observed at lower potentials for LiM(subx)Mn(sub2-x)O(sub4). The FeAu incorporation increased the reaction rate upon reduction of LiMn(sub2)O(sub4) as indicated by the enhanced reduction peak seen by cyclic voltammetry. Nyquist plots of the electrochemical impedance spectroscopy (EIS) results showed LiFeAu(subx)Mn(sub2-x)O(sub4) having increased conductivity with lower resistance of charge. X-ray diffraction studies showed the LiM(subx)Mn(sub2-x)O(sub4) material retained well-developed octahedral structures bounded by (111) planes. The material crystallite size was 10 nm with clear lattice fringes having a separation value of 0.48 nm which concurrently improved the diffusion rate of Li(sup+). Solid-state NMR results showed the progressive increase in average nominal manganese oxidation state from +3.5 to +4 resulted in an increase in the super-transferred hyperfine field at the (sup7)Li nucleus of the FeAu doped cathode material. The LiFeAu(subx)Mn(sub2-x)O(sub4) material also showed improved cycleability, especially at high C rate. This improvement was due to the enhanced physical stability of LiMn(sub2)O(sub4) and its improved electrical conductivity ascribed to the incorporated FeAu nanoparticles. DA - 2013-07 DB - ResearchSpace DP - CSIR KW - Lithium-ion batteries KW - Cathode material KW - Nanomaterials KW - Doping KW - Charge transport LK - https://researchspace.csir.co.za PY - 2013 SM - 0013-4686 T1 - Transition metal alloy-modulated lithium manganese oxide nanosystem for energy storage in lithium-ion battery cathodes TI - Transition metal alloy-modulated lithium manganese oxide nanosystem for energy storage in lithium-ion battery cathodes UR - http://hdl.handle.net/10204/7412 ER - en_ZA


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