Improving the Electrochemical Activity of LiMnPO4 Via Mn-Site Substitution
HPL SA report the modification of the electrochemical performance of lithium manganese phosphate (LiMnPO4) via Mn-site bivalent substitution. Manganese (10%) is substituted with iron, nickel, magnesium, or zinc. These substituents are shown via an X-ray to form solid solutions. The choice of substituent is demonstrated to have a strong influence on the electrochemical performance. The optimum performance improvement was achieved when 10% of Fe is substituted. This is ascribed to a smaller crystallite and a higher electronic conductivity observed in this material: Presumably Fe plays a role in hindering the crystallite growth and in increasing the carrier's transportation. Electronic structures were calculated by density function theory to understand the different influences of substitute cations.
Keywords: density functional theory ; electrical conductivity ; electrochemistry ; electronic structure ; lithium compounds ; manganese compounds ; secondary cells ; solid solutions ; stoichiometry ; Rechargeable Lithium Batteries ; Lifepo4 Synthesis Routes ; Cathode Materials ; Phospho-Olivines ; 1St Principles ; Ion Batteries ; Lixmpo4 M ; Performance ; Iron ; Conductivity
Record created on 2011-12-16, modified on 2016-08-09