51 / 2019-09-19 16:05:17

SIZE and COMPOSITION EFFECTS IN NSPC/CeO2/S COMPOSITES FOR LITHIUM-ION BATTERIES

Nano-sheet porous carbon, CeO2, Lithium-ion Battery

A nano-sheet porous carbon (NSPC) was synthesized using corn flour as carbon source. NSPC/CeO2 composites were prepared by loading CeO2 on NSPC, and NSPC/CeO2/S composites were fabricated by loading sulfur on NSPC/CeO2. For comparison, a NSPC/S composite was also synthesized similarly. Structural characterization of NSPC/CeO2 shows that CeO2 nanoparticles are uniformly dispersed on NSPC, and the particle size is only about 3 nm. The electrochemical performance test was used to study the effect of CeO2 in the electrode reaction process. The initial discharge capacity of NSPC/CeO2/S is 1538 mAh g-1 at 0.1C, and decreases to 929 mAh g-1 after 100 cycles. Compared with NSPC/CeO2/S cathode, the NSPC/S cathode delivers a lower initial discharge capacity of 1194 mAh g-1 and decreases to 482 mAh g-1 after 100 cycles. The results show that both the cycling and rate performance of NSPC/CeO2/S are significantly better than NSPC/S, which is mainly attributed to the excellent catalytic activity and rich active sites of CeO2.