煅烧
碳化
硫黄
材料科学
阴极
碳纤维
锂(药物)
离子
微观结构
兴奋剂
电池(电)
化学工程
化学
复合材料
光电子学
物理化学
催化作用
扫描电子显微镜
有机化学
热力学
复合数
冶金
功率(物理)
物理
医学
工程类
内分泌学
作者
Yifang Zhao,Lian Wu,Yue Yu,Yongqiang Dai,Bing Liao,Hao Pang
出处
期刊:Dalton Transactions
[The Royal Society of Chemistry]
日期:2022-01-01
卷期号:51 (31): 11665-11674
被引量:2
摘要
Besides the adjustment of the active centres, the precisely designed microstructures of the carbon hosts also play a significant role in improving the battery performance. Herein, MOF-derived Fe3O4@NCs were prepared through a molten salt-assisted calcination method at different carbonization temperatures. Compared with the materials obtained at 700 °C, LK450 calcined at a lower temperature of 450 °C maintains suitable pore sizes and more N-doping and exhibits excellent Li-ion transport performance. Thus, the S/LK450 cathode can achieve an outstanding rate performance of up to 5 C (∼528 mA h g-1) and an extremely low capacity decay of 0.037% per cycle after 500 cycles at 1C. Notably, even with a high sulfur loading (4.0 mg cm-2), the S/LK450 cathode can still deliver a high capacity of 673 mA h g-1 at 0.2C after 100 cycles. Briefly, this work demonstrates the superiorities to prepare the samples at relatively low carbonization temperatures, which guarantee a better ion path structure and sufficient N-doping in the carbon skeleton.
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