期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 8, 期 50, 页码 18636-18645出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c06944
关键词
Lithium-sulfur batteries; Bifunctional; Perovskite; Adsorption; Catalytic
资金
- National Natural Science Foundation of China (NSFC) [22075174, 21671133, 21271010]
- Technology Commission of Shanghai Municipality [18020500800, 18JC1412900, 19DZ2271100]
- International Joint Laboratory on Resource Chemistry
Due to the high theoretical energy density, lithium-sulfur batteries have been regarded as one of the secondary cells with promising development prospects. Here, the vacuum filtration is used to prepare multiwalled carbon nanotube/La0.65Sr0.35MnO3(MWCNT/LaSrMn) composite coatings on the Celgard separator to obtain the functional separator, thus achieving a highly stable lithium-sulfur battery. In the polysulfide solution, the presence of O sites and Sr sites forms Li-O bonds and Sr-S bonds respectively, which is more conducive to polysulfide adsorption. Moreover, LaSrMn acts as an intermediate site to accept the deposition of Li2S and promote its uniform spread. The high catalytic properties of LaSrMn can accelerate the redox kinetics of polysulfides. The lithium-sulfur battery with an MWCNT/LaSrMn-Celgard separator exhibits excellent performance. The initial specific capacity of the battery with LaSrMn/MWCNT-Celgard separator is as high as 859.2 mAh g(-1). After 500 cycles, the capacity slowly decreases to 730.3 mAh with a little capacity attenuation rate of only 0.03% per cycle. The capacity is rapidly stabilized at 868 mAh g(-1) even after 100 cycles at 60 degrees C, with a capacity attenuation rate of 0.03% per cycle at IC.
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