Development of sulfur-polyacrylonitrile/graphene composite cathode for lithium batteries

Li-S batteries;Polyacrylonitrile;Lithium-ion batteries;Energy storage;Chemical Engineering

Li, Jing

University of Waterloo

关键词: Li-S batteries;    Polyacrylonitrile;    Lithium-ion batteries;    Energy storage;    Chemical Engineering;   

Others  :  https://uwspace.uwaterloo.ca/bitstream/10012/7501/1/Li_Jing.pdf

瑞士|英语

来源: UWSPACE Waterloo Institutional Repository

【 摘 要 】

Rechargeable lithium sulfur (Li-S) batteries are potentially safe, environmentally friendly and economical alternative energy storage systems that can potentially be combined with renewable sources including wind solar and wave energy. Sulfur has a high theoretical specific capacity of ~1680 mAh/g, attainable through the reversible redox reaction denoted as S8+16Li ↔8Li¬2S, which yields an average cell voltage of ~2.2 V. However, two detrimental factors prevent the achievement of the full potential of the Li-S batteries. First, the poor electrical/ionic conductivity of elemental sulfur and Li2S severely hampers the utilization of active material. Second, dissolution of intermediate long-chain polysulfides (Li2Sn, 2