Abstract
Li3V2(PO4)3/C is prepared by an improved sol-gel method and then modified with various amounts of Ti3SiC2 by a suspension mixing process. This process allows Li3V2(PO4)3/C platelets to attach on the surface of nanolaminated Ti3SiC2 particles, creating an integrated conductive network. Such superior structure brings a significant improvement in initial discharge capacity, rate performance and cycle ability of Ti3SiC2-modified samples over Li3V2(PO4)3/C at low temperatures. At both 0 and −20°C, the 4wt% Ti3SiC2-modified sample (T-4) shows the best electrochemical performance between 3.0 and 4.8V. Especially, it delivers a reversible capacity of 80.8mAhg−1 in 50 cycles at 2C under −20°C, while the discharge capacity of the pristine sample is only 10.7mAhg−1 under the same conditions.
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