镧掺杂锡酸钡/多壁碳纳米管改性隔膜的制备及其在锂硫电池中的应用

La-Doped BaSnO_(3)/Multi-walled Carbon Nanotube Modified Separator:Synthesis and Application in Lithium-Sulfur Battery

通过将共沉淀法制备的钙钛矿型氧化物镧掺杂锡酸钡(LBSO)与多壁碳纳米管(MCNT)混合均匀,制成浆料,并利用刮涂法将其涂布在商业隔膜Celgard 2500(PP)表面构筑阻挡层,获得改性隔膜(LBSO/MCNT/PP)。基于该改性隔膜的锂硫电池在0.1C下具有高达1 433 mAh·g^(-1)的初始放电比容量,1C时300次循环后每圈容量衰减率为0.114%;当电流密度提高到3C时,仍具有764 mAh·g^(-1)的放电比容量,表现出优良的倍率性能和循环稳定性,这主要是由于该阻挡层能够有效抑制多硫化物的穿梭。

Herein, an interlayer was constructed on the commercial separator Celgard 2500(PP) by doctor blade coating a mixture slurry of perovskite oxide lanthanum doped barium stannate(LBSO) that was prepared by co-precipitation method and multi-walled carbon nanotubes(MCNT). The as-obtained modified separator was named LBSO/MCNT/PP. The lithium-sulfur battery using the modified separator delivered an initial discharge specific capacity up to 1 433 mAh·g^(-1)at 0.1C and a capacity decay rate of 0.114% per cycle over 300 cycles at 1C. As the current density was increased to a 3C rate, a discharge specific capacity of 764 mAh·g^(-1)can still be maintained,showing excellent rate capability and cycling stability, which is ascribed to the effective inhibition of the interlayer towards the shuttle of polysulfides.