Acta Chim. Sinica ›› 2015, Vol. 73 ›› Issue (2): 151-155.DOI: 10.6023/A14100691 Previous Articles    



叶亚, 朱婧怡, 姚依男, 王雨果, 吴平, 唐亚文, 周益明, 陆天虹   

  1. 江苏省新型动力电池重点实验室 江苏省生物医药功能材料协同创新中心 南京师范大学化学与材料科学学院 南京 210023
  • 投稿日期:2014-10-08 发布日期:2015-01-29
  • 通讯作者: 周益明,
  • 基金资助:

    项目受江苏省产学研前瞻性研究(No. BY2013001-01)、江苏省自然科学基金(No. BK20130900)、江苏省高校自然科学基金(No. 13KJB150026)、南京师范大学高层次人才启动基金(No. 2013103XGQ0008)和江苏高校优势学科建设工程项目资助.

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   

  1. 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
  • Received:2014-10-08 Published:2015-01-29
  • Supported by:

    Project Supported by the Industry-Academia Cooperation Innovation Fund Project of Jiangsu Province (No. BY2013001–01), Natural Science Foundation of Jiangsu Province (No. BK20130900), Natural Science Foundation of Jiangsu Higher Education Institutions of China (No. 13KJB150026), Priming Scientific Research Foundation for Advanced Talents in Nanjing Normal University (No. 2013103XGQ0008) and the Program Development of Jiangsu Higher Education Institutions.

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.

Key words: lithium-ion batteries, anode materials, MC-Sn, polyol system, chemical reduction approach