Influences of the electrolyte composition on the charge and discharge characteristics of LiCr0.1Mn1.9O4 positive electrode

The charge and discharge characteristics of chromium-substituted lithium ma nganate spinel, LiCr0.1Mn1.9O4, have been studied in organic electrolyte so lutions with different compositions. The rate capability and the cycle perf ormance of the oxide cathode depended much on the electrolyte composition. Higher initial capacity was observed in the electrolyte solution showing hi gher ionic conductivity. Good cycle performance was obtained in LiBF4 solut ions with ternary solvent systems containing 1,2-dimethoxyethane (DME). Add ition of Li2CO3 to the LiPF6 solution improved the cycleability of the oxid e cathode. The electrolyte composition giving lower impedance at the oxide/ solution interface showed less capacity degradation during the charge/disch arge cycles. (C) 2001 Elsevier Science B.V. All rights reserved.