论文部分内容阅读
A new mesoporous carbon-tin(MC-Sn)nanocomposite has been successfully prepared via a two-step method. From the transmission electron microscopy(TEM)observations,the tin nanoparticles were decorated on the as-prepared mesoporous carbons.The mesoprous structure of the carbon can effectively buffer the volume changes during the Li-Sn alloying and de-alloying cycles.The as-prepared MC/Sn nanocomposite electrodes exhibited extremely good cycling stability,with the specific capacity of Sn in the composite electrode calculated to be 959.7 mAh·g~(-1),which amounts to an impressive 96.9% of the theoretical value(990 mAh·g~(-1)).The reversible capacity after 200 cycles is 96.1% of the first cycle reversible capacity,i.e.,the capacity fade rate is only 0.0195% per cycle,which is even better than that of commercial graphite-based anodes.
A new mesoporous carbon-tin (MC-Sn) nanocomposite has been successfully prepared via a two-step method. From the transmission electron microscopy (TEM) observations, the tin nanoparticles were decorated on the as-prepared mesoporous carbons. the carbon can effectively buffer the volume changes during the Li-Sn alloying and de-alloying cycles. The as-prepared MC / Sn nanocomposite electrodes exhibited extremely good cycling stability, with the specific capacity of Sn in the composite electrode calculated to be 959.7 mAh · G ~ (-1), which amounts to an impressive 96.9% of the theoretical value (990 mAh · g -1). The reversible capacity after 200 cycles is 96.1% of the first cycle reversible capacity, ie, the capacity fade rate is only 0.0195% per cycle, which is even better than that of commercial graphite-based anodes.