|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|6477138||1426595||2016||6 صفحه PDF||سفارش دهید||دانلود رایگان|
- Non-graphitizable carbon (NGC) is obtained by carbonizing tubular polypyrrole (T-PPy) synthesized via a self-degraded template method.
- K-NGC/S is prepared by mixing S with K-NGC via melt-diffusion method where NGC is activated by KOH (denoted as K-NGC).
- K-NGC/S shows good specific discharge capacity and rate capability.
Non-graphitizable carbon (NGC) has been obtained by carbonizing tubular polypyrrole (T-PPy) synthesized through a self-degraded template method. K-NGC/S composite has been prepared by mixing S with K-NGC via melt-diffusion method where NGC has been activated by potassium hydroxide (denoted as K-NGC) and is used as a conductive additive. The as-prepared K-NGC/S composite shows good specific discharge capacity and rate capability with an initial specific discharge capacity of 1121.9Â mAhÂ gâÂ 1 and a specific discharge capacity of 729.7Â mAhÂ gâÂ 1 after 50Â cycles at a current density of 335Â mAÂ gâÂ 1, which is better than pure S. This improvement in the specific discharge capacity and the rate capability of the cell with K-NGC/S composite as a cathode material is realized by the existence of K-NGC, which can offers a superb conductive environment for S, effectively encapsulate S, restrain the outward diffusion of polysulfides, buffer volume change upon cycling and reduce the dissolution of lithium polysulfides into the electrolyte. The good electrochemical performance of K-NGC/S composite would make it become a promising cathode material for lithium-sulfur batteries.
Journal: Journal of Electroanalytical Chemistry - Volume 780, 1 November 2016, Pages 26-31