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Freestanding Flexible Li 2 S Paper Electrode with High Mass and Capacity Loading for High‐Energy Li–S Batteries
Author(s) -
Yu Mingliang,
Wang Zhiyu,
Wang Yuwei,
Dong Yanfeng,
Qiu Jieshan
Publication year - 2017
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201700018
Subject(s) - cathode , materials science , anode , lithium (medication) , electrode , energy storage , carbon nanofiber , electrospinning , carbon fibers , chemical engineering , nanotechnology , nanoparticle , nanofiber , composite material , carbon nanotube , power (physics) , electrical engineering , chemistry , medicine , quantum mechanics , endocrinology , composite number , polymer , physics , engineering
Lithium–sulfur (Li–S) batteries are a very appealing power source with extremely high energy density. But the use of a metallic‐Li anode causes serious safety hazards, such as short‐circuiting and explosion of the cells. Replacing a sulfur cathode with a fully‐lithiated lithium sulfide (Li 2 S) to pair with metallic‐Li‐free high‐capacity anodes paves a feasible way to address this issue. However, the practical utility of Li 2 S cathodes faces the challenges of poor conductivity, sluggish activation process, and high sensitivity to moisture and oxygen that make electrode production more difficult than dealing with sulfur cathodes. Here, an efficient but low‐cost strategy for easy production of freestanding flexible Li 2 S‐based paper electrodes with very high mass and capacity loading in terms of in situ carbonthermal reduction of Li 2 SO 4 by electrospinning carbon is reported. This chemistry enables high loading but strong affinity of ultrafine Li 2 S nanoparticles in a freestanding conductive carbon‐nanofiber network, meanwhile greatly reducing the manufacturing complexity and cost of Li 2 S cathodes. Benefiting from enhanced structural stability and reaction kinetics, the areal specific capacities of such cathodes can be significantly boosted with less sacrificing of high‐rate and cycling capability. This unique Li 2 S‐cathode design can be directly applied for constructing metallic‐Li‐free or flexible Li–S batteries with high‐energy density.