Synthesis and electrochemical properties of Cr and Vsubstituted Li2MnO3 as cathode materials for secondary lithium batteries
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In an attempt to improve the electrochemical performance of Li2MnO3 cathode, Cr and V are substituted for Mn via anaqueous reduction reaction followed by heating in air. Li3VO4 and Li2CrO4 impurities in the as-prepared Li2[Mn1-2xCrxVx]O3(0 ≤ x ≤ 0.2) samples are removed by washing with deionized (DI) water. Although the washed samples have deficientmetal contents, monoclinic layered structures are obtained. Li1.596[Mn0.806Cr0.181V0.013]O3 has a composite phase ofLi2MnO3 • LiCrO2 • LiVO2 • Li4Mn5O12 and can deliver more than 225mAh/g of discharge capacity above 2.5 V vs. Li at 10 mA/g. Structural changes due to the oxygen loss are minimized, and excellent cycle performance and rate capability have been achieved.
Abstract
In an attempt to improve the electrochemical performance of Li2MnO3 cathode, Cr and V are substituted for Mn via anaqueous reduction reaction followed by heating in air. Li3VO4 and Li2CrO4 impurities in the as-prepared Li2[Mn1-2xCrxVx]O3(0 ≤ x ≤ 0.2) samples are removed by washing with deionized (DI) water. Although the washed samples have deficientmetal contents, monoclinic layered structures are obtained. Li1.596[Mn0.806Cr0.181V0.013]O3 has a composite phase ofLi2MnO3 • LiCrO2 • LiVO2 • Li4Mn5O12 and can deliver more than 225mAh/g of discharge capacity above 2.5 V vs. Li at 10 mA/g. Structural changes due to the oxygen loss are minimized, and excellent cycle performance and rate capability have been achieved.
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