Hybrid polyacrylamide/carbon coating on sulfur cathode for advanced lithium sulfur battery

Hybrid polyacrylamide/carbon coating on sulfur cathode for advanced lithium sulfur battery
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用于先进锂硫电池的硫阴极上的混合聚丙烯酰胺/碳涂层

DOI:
10.1016/j.electacta.2017.05.081
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发表时间:
2017-08
影响因子:
6.6
通讯作者:
Lai Yanqing
Lai Yanqing
中科院分区:
材料科学2区
文献类型:
--
作者:
Li Tao;Hong Bo;Zhang Kai;Lai Yanqing;Liu Yexiang;Yuan Yan;Hong Bo;Cao Huawei;Huang Zixin;Hong Bo;Lai Yanqing

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在硫阴极表面涂覆聚丙烯酰胺(PAM)和两种炭黑组成的商品化导电浆料。杂化PAM/C涂层不仅在物理上阻滞了多硫化物,而且在化学上锚定了多硫化物,限制了它们的向外扩散和穿梭。此外,柔性高导电性涂层缓冲了阴极在充放电过程中的体积变化,降低了电荷转移阻力。经过300次循环后,PAM/C涂层阴极的比容量高达~ 900 mAh g - 1,与未涂层或传统的PVDF/C涂层阴极相比,这是可逆容量和循环能力的显着改善。
Commercialized conductive slurry consisting of polyacrylamide (PAM) and two kinds of carbon black was coated on the surface of sulfur cathode. The hybrid PAM/C coating not only physically blocks but also chemically anchors polysulfides within the cathode, confining their out-diffusion and shuttle. Besides, the flexible and highly-conductive coating layer buffers volume change of the cathode during discharge-charge process and reduces charge transfer resistance. A specific capacity of as high as ∼900 mAh g−1after 300 cycles is demonstrated for the PAM/C coated cathode, which is a significant improvement of reversible capacity and cycle capability compared to uncoated or conventional PVDF/C coated cathode.
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