4.8 Article

Mesoporous carbon spheres with controlled porosity for high-performance lithium-sulfur batteries

期刊

JOURNAL OF POWER SOURCES
卷 285, 期 -, 页码 469-477

出版社

ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.03.135

关键词

Lithium-sulfur battery; Porous carbon spheres; Hierarchical pores; Spray drying; Sodium alginate

资金

  1. National Key Project on Basic Research [2012CB722705]
  2. National High Technology Research and Development Program of China [2012AA110407, 2014AA052303]
  3. Natural Science Foundation of China [21103096, U1232104]
  4. Top-notch Innovative Talent Program of Qingdao City [13-CX-8]
  5. Taishan Scholar Program of Shandong Province

向作者/读者索取更多资源

Mesoporous carbon (MC) spheres with hierarchical pores, controlled pore volume and high specific surface areas have been prepared by a mass-producible spray drying assisted template method using sodium alginate as carbon precursor and commercial colloidal silica particles as hard template. The resulting MC spheres, possessing hierarchical pores in the range of 3-30 nm, are employed as conductive matrices for the preparation of cathode materials for lithium-sulfur batteries. A high pressure induced one-step impregnation of elemental sulfur into the pore of the MC spheres has been exploited. The electrochemical performances of sulfur-impregnated MC spheres (S-MC) derived from MC spheres with different pore volume and specific surface area but with the same sulfur loading ratio of 60 wt% (S-MC-X-60) have been investigated in details. The S-MC-4-60 composite cathode material displayed a high initial discharge capacity of 1388 mAhg(-1) and a good cycling stability of 857 mAhg(-1) after 100 cycles at 0.2C, and shows also excellent rate capability of 864 mAhg(-1) at 2C. More importantly, the sulfur loading content in MC-4 spheres can reach as high as 80%, and it still can deliver a capacity of 569 mAhg(-1) after 100 cycles at 0.2C. (C) 2015 Elsevier B.V. All rights reserved.

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