【作者】 范朝英； 李欢欢； 刘丝雨； 孙海珠； 吴兴隆； 张景萍；

【Author】 Chao-Ying Fan;Huan-Huan Li;Si-Yu Liu;Hai-Zhu Sun;Xing-Long Wu;Jing-Ping Zhang;Faculty of Chemistry,Northeast Normal University;

【机构】 东北师范大学；

【摘要】 为了最大程度降低多硫化物的穿梭损失,在本工作中,通过可工业化生产的静电纺丝技术设计了自交织的纳米纤维夹层,纳米纤维是由超小的二氧化钛纳米晶紧密嵌在氮掺杂的多孔碳中组成的。超小的二氧化钛纳米颗粒和氮杂原子提供大量的化学吸附位点来有效地固定多硫化物,而多孔碳网络能迅速地将限制的多硫化物进行原位的氧化还原,极大地提高活性材料的利用。^[1,2]为了折中由于夹层而增加的电池质量,轻质的还原氧化石墨烯包覆的纤维素纸作为三维的集流体来负载活性材料。这种协同的设计使锂硫电池获得较好的容量及循环稳定性。当电池在0.1 C循环100次后,电池仍能达到875 mAh g^-1的可逆容量,容量保持率可以达到91.8%。此外,在1 C的高电流密度下,电池在循环300次后容量保持在663 mA hg^-1,容量损失率只有0.08%。更多还原

【Abstract】 For the purpose to minimize the shuttle loss of polysulfides,in this work,the intertwined nanofibers interlayer based on the ultrafine TiO₂ nanocrystal uniformly embedded within the N-doping porous carbon was designed by the scalable electrostatic spinning,which could chemically immobilize as well as reutilize the polysulfides.In order to counteract the weight load of interlayer,the light-weight three-dimensional current collector derived from the reduced graphene oxide coated cellulose fiber paper was employed to support the active materials.The systematic design has endowed the pure sulfur electrode with excellent capacity and cycle stability.A reversible capacity of875 mA h g^-1 was maintained after 100 cycles with a capacity retention of 91.8%at 0.1 C.Moreover,at the high current density of 1 C,the cell still retained a stable capacity of 663 mA h g^-1 after 300 cycles with a capacity decay rate of only 0.08%.更多还原