One-pot Synthesis of Sn/Mesoporous Carbon Composite in a Polyol System with Well-improved Lithium Storage Capability
Ye Ya, Zhu Jingyi, Yao Yinan, Wang Yuguo, Wu Ping, Tang Yawen, Zhou Yiming, Lu Tianhong
Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023
By introducing three-dimensional mesoporous carbon (MC) as a conducting and buffering matrix, MC-Sn composite has been synthesized through a facile chemical reduction approach in a polyol system at the temperature of 170 ℃ which is protected by nitrogen atmosphere. Pure Sn nanoparticles were synthesized through the same methodology, but without the addition of MC. The morphology, structure and electrochemical performance of the products have been characterized by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), and constant current discharge/charge tests. It is indicated that numerous Sn nanoparticles have been uniformly and densely decorated on the MC matrix. When evaluated as an anode material for lithium-ion batteries (LIBs), the as-prepared MC-Sn composite exhibits markedly improved cycling stability and rate capability compared to pure Sn nanoparticles. For example, a high discharge capacity of 721.5 mAh•g-1 can be retained after 40 discharge/charge cycles at a current density of 100 mA•g-1 in the potential range of 0.01～2 V. When tested under the same condition, pure Sn nanoparticles remain only 361.7 mAh•g-1. The rate capability of MC-Sn composite was examined in comparison with pure Sn nanoparticles at various current densities from 100 to 200, 500 and 1000 mA•g-1. The MC-Sn composite delivers a discharge capacity of 760.5 mAh•g-1 at a current density of 100 mA•g-1 after 10 cycles. This value decreases to 555.6 mAh•g-1 (200 mA•g-1), 366.2 mAh•g-1 (500 mA• g-1), 265.8 mAh•g-1 (1000 mA•g-1), and finally returns to 684.3 mAh•g-1 at 100 mA•g-1. In sharp contrast, the discharge capacities of pure Sn nanoparticles decrease rapidly with the increase of current densities. These results demonstrate that the MC-Sn composite possesses markedly improved rate capability, making it a promising anode for LIBs with high power densities.
叶亚, 朱婧怡, 姚依男, 王雨果, 吴平, 唐亚文, 周益明, 陆天虹. 在多元醇体系中一锅法合成具有良好储锂性能的介孔碳-锡复合材料[J]. 化学学报, 2015, 73(2): 151-155.
Ye Ya, Zhu Jingyi, Yao Yinan, Wang Yuguo, Wu Ping, Tang Yawen, Zhou Yiming, Lu Tianhong. One-pot Synthesis of Sn/Mesoporous Carbon Composite in a Polyol System with Well-improved Lithium Storage Capability. Acta Chim. Sinica, 2015, 73(2): 151-155.