多硫化物
材料科学
电化学
分离器(采油)
电解质
阴极
化学工程
碳纳米管
锂(药物)
硫黄
吸附
电极
无机化学
纳米技术
化学
冶金
有机化学
内分泌学
物理化学
工程类
物理
热力学
医学
作者
Mengzi Geng,Hangqi Yang,Chaoqun Shang
标识
DOI:10.1002/advs.202204561
摘要
The shuttle effect of lithium polysulfides in lithium-sulfur batteries (LSBs) has a detrimental impact on their electrochemical performance. To effectively mitigate the shuttle effect, in this study, the coral-like CuS is introduced to modify the carbon nanotube (CNTs), which is coated on commercial separator and served as the S cathode interlayer (PE@CuS/CNTs). The CuS/CNTs interlayer possesses efficient physical impediment and chemisorption to polysulfide anions. When achieving maximum adsorption to polysulfide anions, a "polysulfide-phobic" surface would be formed as a shield to restrain the polysulfide anions in the cathode region. Simultaneously, the CuS/CNTs interlayer can improve the lithium ion diffusion and guarantee desirable electrochemical reaction kinetics. Consequently, the LSBs with PE@CuS/CNTs show an initial discharge capacity of 1242.4 mAh g-1 at 0.5 C (1 C = 1675 mA g-1 ) and retain a long-term cycling stability (568.5 mAh g-1 after 1000 cycles, 2 C), corresponding to an ultra-low capacity fading rate of only 0.05% per cycle. Also, the LSBs with PE@CuS/CNTs exhibit high resistance to self-discharge and favorable performance under high S loading (4.5 mg cm-2 ) and lean electrolyte (9.4 mLElectrolyte g S-1 ).
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