多硫化物
材料科学
法拉第效率
阴极
电极
碳纳米管
锂硫电池
锂(药物)
电化学
纳米技术
化学工程
硫黄
电解质
化学
冶金
物理化学
内分泌学
工程类
医学
作者
Mingpeng Yu,Junsheng Ma,Ming Xie,Hongquan Song,Fuyang Tian,Shanshan Xu,Yun Zhou,Bei Li,Di Wu,Hong Qiu,Rongming Wang
标识
DOI:10.1002/aenm.201602347
摘要
Freestanding cathode materials with sandwich‐structured characteristic are synthesized for high‐performance lithium–sulfur battery. Sulfur is impregnated in nitrogen‐doped graphene and constructed as primary active material, which is further welded in the carbon nanotube/nanofibrillated cellulose (CNT/NFC) framework. Interconnected CNT/NFC layers on both sides of active layer are uniquely synthesized to entrap polysulfide species and supply efficient electron transport. The 3D composite network creates a hierarchical architecture with outstanding electrical and mechanical properties. Synergistic effects generated from physical and chemical interaction could effectively alleviate the dissolution and shuttling of the polysulfide ions. Theoretical calculations reveal the hydroxyl functionization exhibits a strong chemical binding with the discharge product (i.e., Li 2 S). Electrochemical measurements suggest that the rationally designed structure endows the electrode with high specific capacity and excellent rate performance. Specifically, the electrode with high areal sulfur loading of 8.1 mg cm −2 exhibits an areal capacity of ≈8 mA h cm −2 and an ultralow capacity fading of 0.067% per cycle over 1000 discharge/charge cycles at C/2 rate, while the average coulombic efficiency is around 97.3%, indicating good electrochemical reversibility. This novel and low‐cost fabrication procedure is readily scalable and provides a promising avenue for potential industrial applications.
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