Abstract
Ti-doped Li2Mn1-xTixSiO4 as cathode materials for Li-ion batteries was successfully synthesized by a facile sol-gel method. The addition of Ti to the precursors changed the particle sizes and specific surface areas of Li2MnSiO4. The galvanostatic charge-discharge measurements showed that Ti-doped Li2Mn1-xTixSiO4 (x = 0.06, 0.1, 0.2) electrodes delivered high charge capacity of 298, 286, 248 mA h g-1 and discharge capacity of 203, 211, 171 mA h g-1 in the first cycle, much higher than that of undoped Li2MnSiO4 (52 mA h g-1 for charging and 26 mA h g-1 for discharging). Moreover, the Ti-doped samples exhibited good cycling stability and superior rate capability, as compared to that of pristine sample. Even at a high rate (2 C), the Ti-doped Li2Mn1-xTixSiO4 still maintained high discharge capacities. The remarkable enhancement of battery performance in terms of capacity and rate capability for doped Li2Mn1-xTixSiO4 was primarily attributed to the decrease of charge transfer resistance and the improvement of the Li+ diffusion coefficient.
Original language | English |
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Pages (from-to) | 1612-1618 |
Number of pages | 7 |
Journal | RSC Advances |
Volume | 5 |
Issue number | 2 |
DOIs | |
State | Published - 2015 |