O-NiCo2S4/CNT复合材料对多硫化锂催化转化性能研究

doi:10.19799/j.cnki.2095-4239.2023.0420

摘要/Abstract

摘要：

NiCo₂S₄由于具有丰富的催化位点和金属特性，能够催化锂硫电池中的多硫化锂的氧化还原转化。然而，其催化活性和化学吸附性不足以抑制多硫化锂在长循环中的穿梭效应。通过水热法结合空气煅烧制备了氧掺杂NiCo₂S₄/CNT复合材料(O-NiCo₂S₄/CNT)，系统的实验证明氧掺杂后体相NiCo₂S₄的结晶度增强，表面NiCo₂S₄趋于无定形态，O-NiCo₂S₄/CNT的电导率升高。其次，O掺杂可以有效调节NiCo₂S₄中金属阳离子的电子结构，增强催化活性位点的化学吸附和催化转化能力，进而提升多硫化锂的转化动力学，抑制多硫化锂的穿梭效应。基于O-NiCo₂S₄/CNT功能化隔膜的锂硫电池在0.2 C下初始放电容量高达1362.7 mAh/g，循环150圈后的容量为923 mAh/g，每圈的容量衰减率仅为0.21%。在3 C下，容量可达到701.8 mAh/g。本工作表明，氧原子掺杂金属硫化物是开发高效催化剂的一种有效策略。

关键词: 氧掺杂, 功能化隔膜, 穿梭效应, 多硫化锂, 锂硫电池

Abstract:

NiCo₂S₄ can catalyze the redox conversion of polysulfides in Li-S batteries owing to its abundant catalytic sites and metallic nature. However, its catalytic activity and chemisorption properties are not sufficient for suppressing the shuttle effect of polysulfides during long cycles. The oxygen (O)-doped NiCo₂S₄/CNT (O-NiCo₂S₄/CNT) composite is synthesized using the hydrothermal method combined with annealing under air atmosphere, and systematical experiments demonstrate the increasing crystallinity, amorphous surface, and augmenting conductivity for O-NiCo₂S₄/CNT. Moreover, the O doping can effectively modulate the electronic structure of NiCo₂S₄, thus improving the chemical absorption and catalytic conversion ability, promoting the conversion kinetics of polysulfides, and inhibiting its shuttle effect. The Li-S battery based on O-NiCo₂S₄/CNT functionalized separator has an initial high discharge capacity of 1362.7 mAh/g^{at 0.2 C and a capacity of 923 mAh/g after 150 cycles with a capacity decay rate of only 0.21% per cycle. The capacity can reach 701.8 mAh/g at 3 C. This work shows that oxygen atom doping of metal sulfides is an effective strategy for developing efficient catalysts.}

Key words: oxygen doping, functionalized separators, shuttle effect, polysulfides, lithium-sulfur battery

中图分类号:

TM 911

沈李园, 张桂鑫, 马兆玲. O-NiCo₂S₄/CNT复合材料对多硫化锂催化转化性能研究[J]. 储能科学与技术, 2023, 12(11): 3318-3329.

Liyuan SHEN, Guixin ZHANG, Zhaoling MA. Catalytic conversion performance study of O-doped NiCo₂S₄/CNT composites for Li polysulfides[J]. Energy Storage Science and Technology, 2023, 12(11): 3318-3329.

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O-NiCo₂S₄/CNT复合材料对多硫化锂催化转化性能研究

Catalytic conversion performance study of O-doped NiCo₂S₄/CNT composites for Li polysulfides

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