碳布负载镍掺杂二硫化钼作为锂硫电池正极导电基体研究  

Researches on carbon cloth loaded by Ni doped MoS_(2) as cathode conductive matrix for Li-S batteries

作　　者：张新龙 田爱芬[1] 周犇 卢海[1] ZHANG Xinlong;TIAN Aifen;ZHOU Ben;LU Hai(School of Materials Science and Engineering,Xi'an University of Science and Technology,Xi'an Shaanxi 710054,China)

机构地区：[1]西安科技大学材料科学与工程学院,陕西西安710054

出　　处：《电源技术》2025年第3期577-582,共6页Chinese Journal of Power Sources

基　　金：陕西省教育厅服务地方专项基金(22JC049)。

摘　　要：以四水合钼酸铵、硫脲和四水合乙酸镍为原料,通过水热反应在碳布基体(CC)上原位生长镍掺杂二硫化钼纳米颗粒(NMS),研究了碳布负载NMS(NMS@CC)对多硫化物限域作用和正极电化学性能的影响。研究结果表明,NMS均匀附着在碳布纤维骨架表面,形成了丰富的容硫空间和表面活性位点;镍掺杂提高了二硫化钼对多硫化物的吸附锚定能力,使得NMS@CC导电基体能够更有效限域多硫化物,抑制穿梭效应,并显著促进了电极反应动力学和可逆性;相比原始CC和MS@CC基体,使用NMS@CC基体构筑的多硫化物正极具有相对更优的循环能力与倍率特性,其在0.2 C下初始放电比容量高达1352.3 mAh/g,循环200次后保留的可逆比容量为930.1 mAh/g,并在高载硫条件下仍能保持良好的循环稳定性。Ni-doped MoS_(2) nanoparticles(NMS)were synthesized in-situ on a carbon cloth(CC)by a hydrothermal reaction employing(NH_(4))_(6)Mo_(7)O_(24)·4 H_(2)O,Ni(CH_(3)COO)_(2)·4 H_(2)O and CH_(4)N_(2)S as raw materials.The effects of carbon cloth loaded by NMS(NMS@CC)on the polysulfide(PSs)confinement and cathode performance were investigated.The results demonstrate that NMS is uniformly attached to the surface of the fiber skeleton of the carbon cloth,creating abundant spaces for accommodating sulfur species as well as surface active sites.Ni-doping enhances the anchoring capability of MoS2 towards PSs,leading to powerful sulfur-limitation within the NMS@CC matrix.This greatly suppresses the shuttle effect meanwhile promotes the electrode reaction kinetics and reversibility.Compared to the original CC and MS@CC matrix,the PSs cathode constructed by NMS@CC exhibits improved cycle and rate performance,which delivers an initial specific capacity of 1352.3 mAh/g at a current density of 0.2 C and a preserved capacity of 930.1 mAh/g after 200 cycles.Besides,acceptable cycle stability even at high sulfur loading can still be maintained.

关 键 词：锂硫电池 二硫化钼 导电基体 多硫化物 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]