多硫化物
法拉第效率
纳米纤维
材料科学
硫黄
复合数
锂(药物)
钴
电化学
化学工程
静电纺丝
碳纳米纤维
吸附
催化作用
电极
化学
纳米技术
复合材料
碳纳米管
有机化学
冶金
物理化学
内分泌学
工程类
医学
聚合物
电解质
作者
Ayaulym Belgibayeva,Makpal Rakhatkyzy,Akylbek Adi,Izumi Taniguchi
标识
DOI:10.1002/celc.202200458
摘要
Abstract The free‐standing cobalt phosphides‐based composite nanofiber mats with different compositions (Co y P/C, Co x P/Co 3 (PO 4 ) 2 /C, where 2>x>y>1) were synthesized by electrospinning with heat treatments and applied as multi‐functional interlayers for lithium‐sulfur batteries. The polysulfide confining ability of the interlayers was evaluated by a static polysulfide adsorption test and an electrochemical conversion test using symmetric cells. The Co x P/Co 3 (PO 4 ) 2 /C exhibited better catalytic performance for converting polysulfides, owing to the combination of Co x P with Co 3 (PO 4 ) 2 and P‐doped carbon. As a result, the lithium‐sulfur cell with this interlayer delivered a high initial discharge capacity of 1483 mAh g −1 at 0.1 C, retaining 705 mAh g −1 after 200 cycles at 0.5 C with 100 % Coulombic efficiency. The polysulfide trapping by the interlayer was further elucidated from the results of its ex situ characterizations after discharge and charge processes at different cycles in lithium‐sulfur cells.
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