Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.electacta.2013.04.009
DC FieldValue
dc.titleSol-gel derived nanostructured Li2MnSiO4/C cathode with high storage capacity
dc.contributor.authorDevaraj, S.
dc.contributor.authorKuezma, M.
dc.contributor.authorNg, C.T.
dc.contributor.authorBalaya, P.
dc.date.accessioned2014-10-07T09:10:29Z
dc.date.available2014-10-07T09:10:29Z
dc.date.issued2013
dc.identifier.citationDevaraj, S., Kuezma, M., Ng, C.T., Balaya, P. (2013). Sol-gel derived nanostructured Li2MnSiO4/C cathode with high storage capacity. Electrochimica Acta 102 : 290-298. ScholarBank@NUS Repository. https://doi.org/10.1016/j.electacta.2013.04.009
dc.identifier.issn00134686
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/85649
dc.description.abstractCarbon-coated, nanostructured Li2MnSiO4 (LMS/C) was synthesized by sol-gel method using a chelating carbonizing source, Glucono-1,5-lactone (GAL). Powder X-ray diffraction studies confirmed nominally pure phase formation. SEM and TEM studies revealed that LMS/C is comprised of particles of less than 50 nm in diameter with a thin film of 1-5 nm amorphous carbon coating. Elemental mapping demonstrated a homogenous distribution of carbon throughout LMS/C. Besides carbon coating, GAL promotes phase purity and reduces particle agglomeration during annealing. Raman spectroscopic study revealed that the carbon formed in LMS/C nanocomposite is mostly amorphous. The electrochemical performance of LMS/C was evaluated by galvanostatic charge/discharge cycles at various C-rates. We report here a well-defined, flat charge/discharge plateau for LMS/C with extraction/insertion of 1.5 Li +-ion per formula unit at room temperature in a narrow potential window 2.0-4.5 V at various current rates. Together with ex situ XPS studies carried out at various states of charge we confirm that the charge and discharge plateaus are associated with the redox chemistry of manganese. LMS/C exhibits a stable discharge capacity for about 10 cycles at various C-rates. However, the capacity fades gradually after 11 cycles at all C-rates. An ex situ XRD study confirmed that the phase was retained up to 10 cycles. The stable cycle-life and the improvement in observed electrochemical performance is attributed to the phase retention in LMS/C nanocomposite. © 2013 Elsevier Ltd. All rights reserved.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.electacta.2013.04.009
dc.sourceScopus
dc.subjectFlat charge/discharge plateau
dc.subjectHigh capacity
dc.subjectLi2MnSiO4/C
dc.subjectNanostructure
dc.subjectStable cycle-life
dc.typeArticle
dc.contributor.departmentMECHANICAL ENGINEERING
dc.description.doi10.1016/j.electacta.2013.04.009
dc.description.sourcetitleElectrochimica Acta
dc.description.volume102
dc.description.page290-298
dc.description.codenELCAA
dc.identifier.isiut000321481300036
Appears in Collections:Staff Publications

Show simple item record
Files in This Item:
There are no files associated with this item.

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.