Co-Ni Bimetallic Sulfides Functionalized Interlayer with Efficient Catalytic Conversion for Li-S Batteries

Q4 Energy

International Journal of Nuclear Energy Science and Technology Pub Date : 2023-03-28 DOI:10.57237/j.jest.2023.02.001

Hongqiang Wang, Zhijie Zhang, Liyuan Shen, Juantao Jiang, Qingyu Li, Yezheng Cai, Zhaoling Ma

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引用次数: 0

Abstract

: Tardive practical development of lithium-sulfur (Li-S) batteries faces two fatal nuisances, the grievous shuttle effect of sulfur electrodes as well as rock-ribbed Li dendrites, which results in undesired cycling lifespan and the potential safety hazard. Diversified electrocatalytic materials are employed to enhance polysulfides conversion kinetics and subsequently restrain shuttle effect. Here, pyrite-type cation regulation strategy is applied to motivate the electrochemical catalysis capability of bimetallic sulfide by regulating the cation ratio of Co and Ni ions. The reformative bimetallic sulfide with Co to Ni ratio near 2:1 shows stronger chemical adsorption capability towards lithium polysulfides in contrast to pristine NiS 2 , which resulted from the strong contribution of metal oxide layer. The comparable electrochemical kinetics and electrochemical performances of Li-S batteries with CNS-2/CP interlayer show in the aspects of low polarization voltage, high lithium ion diffusion rate, high discharge capacity, as well as better rate performances. These results demonstrate cation regulation could be an efficient strategy for material design to optimize the surface physicochemical properties of iron pyrite for boosting the cycle durability of Li-S batteries

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钴镍双金属硫化物功能化夹层高效催化转化锂硫电池

锂硫电池(Li-硫)实用化发展缓慢，面临着硫电极严重的穿梭效应和岩纹状锂枝晶两大致命问题，导致循环寿命不理想，存在安全隐患。采用多种电催化材料可提高多硫化物转化动力学，从而抑制穿梭效应。本文采用黄铁矿型阳离子调节策略，通过调节Co和Ni离子的阳离子比来激发双金属硫化物的电化学催化能力。Co / Ni比接近2:1的重整型双金属硫化物对锂多硫化物的化学吸附能力较原始nis2强，这是由于金属氧化层的强烈贡献。具有CNS-2/CP中间层的锂离子电池具有极化电压低、锂离子扩散速率高、放电容量大、倍率性能更好等特点，电化学动力学和电化学性能与CNS-2/CP中间层相当。这些结果表明，阳离子调控可以作为一种有效的材料设计策略来优化黄铁矿的表面物理化学性质，从而提高Li-S电池的循环耐久性

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来源期刊

International Journal of Nuclear Energy Science and Technology Energy-Nuclear Energy and Engineering

CiteScore

0.80

自引率

0.00%

发文量

期刊介绍： Today, nuclear reactors generate nearly one quarter of the electricity in nations representing two thirds of humanity, and other nuclear applications are integral to many aspects of the world economy. Nuclear fission remains an important option for meeting energy requirements and maintaining a balanced worldwide energy policy; with major countries expanding nuclear energy"s role and new countries poised to introduce it, the key issue is not whether the use of nuclear technology will grow worldwide, even if public opinion concerning safety, the economics of nuclear power, and waste disposal issues adversely affect the general acceptance of nuclear power, but whether it will grow fast enough to make a decisive contribution to the global imperative of sustainable development.