Abstract
Li 2(Fe 1− x Mn x )SiO 4 ( x = 0, 0.3, 0.5, 0.7, 1) cathode materials have been synthesized via citric acid assisted sol–gel method. The effects of Mn substitution on the structural, morphological and electrochemical behaviors of Li 2(Fe 1− x Mn x )SiO 4 are investigated. The prepared Li 2(Fe 1− x Mn x )SiO 4 samples can all be indexed on the basis of the orthorhombic unit cell in space group Pmn2 1, and their lattice parameters are similar. Nanoparticles can be observed in the samples. The discharge capacity first increases and then decreases with increasing x. The maximum discharge capacity is obtained when x is equal to 0.5. However, the cycling performance of the Li 2(Fe 1− x Mn x )SiO 4 samples decreases with increasing x. At the same time, Mn substitution lowers the electrochemical reversibility of the Li 2(Fe 1− x Mn x )SiO 4 samples.
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