Free-standing SiO2/C composite nanofiber mats as multi-functional interlayers for high-performance lithium battery with S-rich CuS1+x cathodes
Free-standing SiO2/C composite nanofiber mats as multi-functional interlayers for high-performance lithium battery with S-rich CuS1+x cathodes
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DOI：
10.1016/j.matlet.2021.129595
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发表时间：
2021-02
影响因子：
3
通讯作者：
A. Belgibayeva;Zenta Kawate;I. Taniguchi
中科院分区：
文献类型：
--
作者：
A. Belgibayeva;Zenta Kawate;I. Taniguchi
富硫硫化铜CuS 1 + x具有与硫阴极相当的高电子电导率和容量，是锂电池的理想阴极材料。在这项工作中，独立的SiO_2/C复合材料作为多功能中间层插入到具有CuS_（1 + x）阴极的电池中，以防止穿梭并促进多硫化锂的转化。通过微波辅助水热合成制备的具有中间层和CuS1.49阴极的电池在0.1 C下具有782 mAh g− 1的初始放电容量，并且在20次循环中保持667 mAh g− 1，库仑效率为100%。循环后夹层的非原位表征证实了它们在防止多硫化物穿梭方面的有效性。
S-rich copper sulfides CuS1+xare promising cathodes for lithium batteries, owing to their high electronic conductivities and capacities, comparable to sulfur cathodes. In this work, free-standing SiO2/C composite nanofiber mats are inserted as multi-functional interlayers in cells with CuS1+xcathodes to prevent the shuttle and promote the conversion of lithium polysulfides. Cell with the interlayer and CuS1.49cathode, prepared by microwave-assisted hydrothermal synthesis, has an initial discharge capacity of 782 mAh g−1at 0.1 C and retains 667 mAh g−1over 20 cycles with 100% Coulombic efficiency. Ex situ characterizations of interlayers after cycling confirms their effectiveness in preventing the shuttle of polysulfides.