Improving the rate performance is still a major challenge for Li2FeSiO4 cathode material for Li-ion battery. Herein, hollow spherical Li2FeSiO4/C microscale particles, consisting of carbon-coated primary nanoparticles (20–40nm) have been fabricated by a spray drying-assisted method. The particle size of spherical Li2FeSiO4/C is 1–5μm, which is suitable for commercial application. When used as a cathode material for Li-ion battery, the as-prepared Li2FeSiO4/C composite with 16.7wt.% carbon exhibits a high discharge capacity of 165mAhg−1 at 0.2C rate. At 0.5C, 5C and 10C rates, the capacities of 151mAhg−1, 111mAhg−1, and 96mAhg−1 are observed, respectively, indicating superior rate performance. Meantime, good cycling stability is achieved with a capacity retention of 94.5% at a high current density of 2C after 100cycles. The excellent electrochemical performance is mainly ascribed to the improved ionic/electronic conductivity arising from the hollow spherical structure and carbon-coated primary nanoparticles. The spray drying process shows a great potential for the large scale production of high quality Li2FeSiO4/C composite.
Solid State Ionics – Elsevier
Published: Oct 1, 2015
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