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Fe and V substituted Li2MnSiO4/C As Potential Cathode Material for Li-Ion Batteries

Wagner, Nils Peter; Dalod, Antoine Robert Marie; Svensson, Ann Mari; Vullum-Bruer, Fride
Journal article, Peer reviewed
Accepted version
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URI
http://hdl.handle.net/11250/2462946
Date
2015
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  • Institutt for materialteknologi [2408]
  • Publikasjoner fra CRIStin - NTNU [35008]
Original version
ECS Transactions. 2015, 64 (22), 33-45.   10.1149/06422.0033ecst
Abstract
Lithium transition-metal silicate materials are promising candidates for next generation Li-ion batteries since they allow Li extraction/insertion beyond one Li ion per formula unit. They consist of cheap, non-toxic and abundant elements. Here we focus on the synthesis and electrochemical performance of Fe and V substituted Li2MnSiO4. Cations were substituted to overcome poor stability of the undoped compound and increase conductivity, thus expected to increase the electrochemical performance. Up to 20 mole % Fe and 5 mole % V were incorporated into orthorhombic Pmn21 Li2MnSiO4 while keeping a high phase purity and the desired porous nano-sized structure. For materials with 20 mole % Fe substitution, the reversible Li intercalation capacity during slow cycling (C/33) was increased from 0.63 Li per formula unit for the undoped to 0.81 for the doped sample. A 5 mole % V substitution increased the reversible Li capacity from 0.65 Li per formula unit to 0.73.
Publisher
Electrochemical Society
Journal
ECS Transactions

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