Lithium-ion batteries have been vigorously studied due to their numerous benefits such as high energy density, high voltage and a low self-discharge rate. Prototypes of thin-film batteries have incorporated active materials such as LiCoO2, LiMn2O4 and Li2MSiO4 (where M=Mn, Fe, Ni, etc.). Lithium silicates have been proposed as candidates with higher theoretical capacity. In this project we want to test the hypothesis that Li2MSiO4 with mixed M of Fe and Mn might provide superior performance to the pure phases as observed in the case of the layered LiMO2 cathodes. Li2FexMn1-xSiO4 materials with different Mn to Fe ratios have been synthesized using a sol-gel procedure. We characterized the composites through an array of tests, including XRD, SEM and coin-cell battery testing.
Worcester Polytechnic Institute
Major Qualifying Project
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