Hydroxylated N-doped carbon nanotube-sulfur composites as cathodes for high-performance lithium-sulfur batteries

JOURNAL OF POWER SOURCES

卷:343

Article

Lee, Jun Seop¹  Manthiram, Arumugam¹ 

[1] Univ Texas Austin, Mat Sci & Engn Program, Texas Mat Inst, Austin, TX 78712 USA

关键词: Lithium-sulfur batteries;    Carbon nanotubes;    Nitrogen doping;    Cycle stability;    Activation poly-sulfide shuttle;   

DOI  :  10.1016/j.jpowsour.2017.01.049

来源: Elsevier

【 摘 要 】

Despite the higher energy density than the conventional Li-ion cells at a lower cost, commercialization of Li-S batteries is hindered by the insulating nature of sulfur and the dissolution of intermediate poly sulfides (Li(2)Sx, 4 < X <= 8) into the electrolyte. We demonstrate here hydroxylated N-doped carbon nanotubes (H-NCNT) as sulfur containers in lithium-sulfur batteries to reduce polysulfide shuttling through an interaction between polysulfides and nitrogen and hydroxyl groups in the H-NCNT. This sulfur-carbon composite electrode with 2.2 mg cm(-2) sulfur displays excellent performance with high rate capability (initial capacity of 1341 mAh g(-1) at C/5 rate and 849 mAh g(-1) at 5C rate), rate stability until 500 cycles (a decay of 0.06% per cycle). Furthermore, a stable reversible capacity of as high as -1081 mAh g(-1) is realized with a higher sulfur loading of 5.1 mg cm(-2). (C) 2017 Elsevier B.V. All rights reserved.

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