Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry; Collaborative Innovation Center of Chemical Science and Engineering, Nankai University , Tianjin 300071, China.
Nano Lett. 2014 Jan 8;14(1):153-7. doi: 10.1021/nl403631h. Epub 2013 Dec 13.
In this Letter, we reported on the preparation and Li-ion battery anode application of ultrasmall Sn nanoparticles (∼5 nm) embedded in nitrogen-doped porous carbon network (denoted as 5-Sn/C). Pyrolysis of Sn(Salen) at 650 °C under Ar atmosphere was carried out to prepare N-doped porous 5-Sn/C with the BET specific surface area of 286.3 m(2) g(-1). The 5-Sn/C showed an initial discharge capacity of 1014 mAh g(-1) and a capacity retention of 722 mAh g(-1) after 200 cycles at the current density of 0.2 A g(-1). Furthermore, a reversible capacity of ∼480 mAh g(-1) was obtained at much higher current density of 5 A g(-1). The remarkable electrochemical performance of 5-Sn/C was attributed to the effective combination of ultrasmall Sn nanoparticles, uniform distribution, and porous carbon network structure, which simultaneously solved the major problems of pulverization, loss of electrical contact, and particle aggregation facing Sn anode.
在这封信件中，我们报道了嵌入氮掺杂多孔碳网络中的超小 Sn 纳米粒子（约 5nm，记为 5-Sn/C）的制备及其在锂离子电池阳极中的应用。在 Ar 气氛下，通过 Sn(Salen)的热解，在 650°C 下制备出具有 286.3 m(2) g(-1)比表面积的 N 掺杂多孔 5-Sn/C。在 0.2 A g(-1)的电流密度下，5-Sn/C 经过 200 次循环后，具有 1014 mAh g(-1)的初始放电容量和 722 mAh g(-1)的容量保持率。此外，在更高的电流密度 5 A g(-1)下，可获得约 480 mAh g(-1)的可逆容量。5-Sn/C 的显著电化学性能归因于超小 Sn 纳米粒子的有效结合、均匀分布和多孔碳网络结构，同时解决了 Sn 阳极面临的粉化、电接触损失和颗粒团聚等主要问题。
