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Fabrication of a novel TiO2/S composite cathode for high performance lithium-sulfur batteries

机译:新型用于高性能锂硫电池的TiO2 / S复合阴极的制备

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摘要

Sulfur is an attractive cathode material with a high specific capacity of 1675 mA h g(-1), but its rapid capacity decay due to polysulfide dissociation presents a significant technical challenge. Here, we present the fabrication of a TiO2/S composite cathode by encapsulating elemental sulfur into TiO2 nanotube hosts for high performance lithium-sulfur batteries. A high capacity of 913 mA h g(-1) has been achieved at a rate of 0.2C in the initial cycle for the TiO2/S composite cathode with a sulfur content of 65 wt% and the reversible capacity remains as high as 851 mA h g(-1) after 100 cycles. The improvements of electrochemical performances were attributed to the good dispersion of sulfur in the TiO2 nanotubes and the excellent adsorbing effect on polysulfides of TiO2.
机译:硫是一种有吸引力的阴极材料,具有1675 mA h g(-1)的高比容量,但由于多硫化物的离解而使其容量快速下降,这对技术提出了巨大挑战。在这里,我们介绍了通过将元素硫封装到用于高性能锂硫电池的TiO2纳米管主体中来制造TiO2 / S复合阴极的方法。含硫量为65 wt%的TiO2 / S复合阴极在初始循环中以0.2C的速率在9.3 C的条件下已获得913 mA hg(-1)的高容量,可逆容量仍高达851 mA hg (-1)经过100个循环。电化学性能的提高归因于硫在TiO2纳米管中的良好分散和对TiO2的多硫化物的优异吸附作用。

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