材料科学
化学工程
聚吡咯
退火(玻璃)
硫化钴
锰酸盐
硫黄
介孔材料
法拉第效率
多孔性
钴
电解质
阴极
无机化学
冶金
复合材料
化学
电极
电化学
催化作用
聚合物
有机化学
功率(物理)
物理化学
工程类
电池(电)
物理
量子力学
聚合
作者
Lvlv Gao,Ningning Huang,Jun Wang,Haibo Ren,Sang Woo Joo,Jiarui Huang
标识
DOI:10.1016/j.jallcom.2021.161350
摘要
Lithium–sulfur (Li–S) batteries suffer from the poor conductivity originated from sulfur and shuttle effect arisen from the polysulfides dissolution. Herein, cobalt manganate (CoMn2O4) porous nanocubes coated with polypyrrole (PPy) as sulfur carrier are prepared using MnCO3 nanocube template through a precipitation method and a subsequent annealing process. The unique approach can obtain porous CoMn2O4 nanocubes with uniform morphology and abundant exposed active sites. The plentiful mesopores among the porous nanocubes are beneficial to accommodation of sulfur. In addition, the porous CoMn2O4 nanocubes can trap polysulfides in the cycling process owing to the chemical bonds between CoMn2O4 and polysulfides. Moreover, PPy coating severed as conductive layer not only enhances electrical conductivity of the cathode, but also confines polysulfides via the formation of N–Li–S bonds during cycling process. Therefore, the porous CoMn2O4/[email protected] nanocubes with 66.9% sulfur mass content delivered a capacity of 533 mAh g−1 over 500 cycles at 1 A g−1 with a capacity decay rate of 0.064% each cycle, and a Coulombic efficiency of 98%, suggesting the enhanced cycling performance of cathode. The facile template precipitation method combined with an annealing process contribute a new approach to synthesize unique porous CoMn2O4 structure as sulfur carrier for Li–S batteries
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