多硫化物
材料科学
分离器(采油)
钴
化学工程
催化作用
锂硫电池
电池(电)
吸附
硫黄
合金
过渡金属
镍
活性炭
无机化学
电极
电化学
冶金
电解质
有机化学
化学
物理化学
功率(物理)
工程类
物理
热力学
量子力学
作者
Qiang Zhang,Xu Zhang,Da Lei,Shaoming Qiao,Qian Wang,Xiaoshan Shi,Chunhong Huang,Gaohong He,Fengxiang Zhang
标识
DOI:10.1021/acsami.2c21903
摘要
Transition-metal compounds can be used as electrocatalysts to expedite polysulfide conversion effectively in lithium-sulfur batteries. However, insufficient conductivity and tedious preparation process still limit their practical applications. In this work, NiCo alloy nanoparticles embedded in hollow carbon spheres (NiCo@HCS) are fabricated via a facile, template-free strategy from the NiCo-metal–organic framework (MOF) precursor and used as electrocatalysts for separator modification. NiCo@HCS can not only improve the adsorption capacity of polysulfides by d-band deviation to the Fermi level but also reduce the energy barrier in the process of catalytic polysulfide conversion. Due to favorable three-dimensional (3-D) morphology, improved adsorption, and promoted kinetics of NiCo@HCS, the battery containing the NiCo@HCS-modified separator gives a starting capacity of 1377 mAh g–1 at 0.2C, which is retained by 72% over 500 charge/discharge operations at 1.0C current density. Moreover, the battery’s start capacity reaches 1180 mAh g–1 (5.9 mAh cm–2) with a high sulfur content of 5.0 mg cm–1 at 0.2C.
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