多硫化物
材料科学
催化作用
溶解
成核
锂(药物)
化学工程
兴奋剂
硫黄
氧化还原
纳米技术
储能
空位缺陷
电极
化学
光电子学
物理化学
电解质
有机化学
功率(物理)
工程类
内分泌学
物理
医学
冶金
量子力学
结晶学
作者
Xiaoya Zhou,Yuchen Cui,Xin Huang,Xin Wu,Hao Sun,Shaochun Tang
出处
期刊:Small
[Wiley]
日期:2023-06-07
卷期号:19 (40)
被引量:22
标识
DOI:10.1002/smll.202301545
摘要
Practical applications of lithium-sulfur (Li-S) batteries have been hindered by sluggish reaction kinetics and severe capacity decay during charge-discharge cycling due to the notorious shuttle effect of polysulfide and the unfavored deposition and dissolution of Li2 S. Herein, to address these issues, a double-defect engineering strategy is developed for preparing Co-doped FeP catalyst containing P vacancies on MXene, which effectively improves the bidirectional redox of Li2 S. Mechanism analysis indicates that P vacancy accelerates Li2 S nucleation via increased unsaturated sites, and Co doping generates local electric field to reduce the reaction energy barrier and accelerate Li2 S dissolution. MXene provides highly conductive channels for electron transport, and effectively captures polysulfide. The double-defect catalyst enables an impressive reversible specific capacity of 1297.9 mAh g-1 at 0.2 C, and excellent rate capability of 726.5 mAh g-1 at 4 C. Remarkably, it demonstrates excellent cycling stability with capacity retention of 533.3 mAh g-1 after 500 cycles at 2 C. The results can unlock the double-defect engineering of vacancy induction and heteroatomic doping towards practical Li-S batteries.
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