Synergistic enhancement of Li-S battery low-temperature cycling performance by nano-sized uniformly compounded FeCoNi and MnO nanoparticles
Synergistic enhancement of Li-S battery low-temperature cycling performance by nano-sized uniformly compounded FeCoNi and MnO nanoparticles
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DOI：
10.1016/j.cej.2023.141445
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发表时间：
2023-02
影响因子：
15.1
通讯作者：
Xiaowan Pang;B. An;Shumin Zheng;Bao Wang
中科院分区：
文献类型：
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作者：
Xiaowan Pang;B. An;Shumin Zheng;Bao Wang
锂硫（Li-S）电池具有较高的能量密度，在储能市场具有巨大的潜力。然而，在低温环境下，由于多硫化物（LiPS）的聚集，缓慢的电化学反应，和严重的极化，商业应用受到严重阻碍。以往的研究工作证明，合金颗粒能够实现高性能的低温Li-S电池，但由于低温下严重的穿梭效应，其循环稳定性并不理想。在这里，FeCoNi纳米颗粒（NPs）被引入作为催化剂，受益于结构和组成的优点，它可以协同催化更多种类的LiPS。为了增强吸附能力，MnO NP用于锚LiPS，从而在FeCoNi NP和MnO NP周围提供更高浓度的LiPS，从而防止穿梭效应并增强低温下的循环稳定性。最后，采用一步原位热解法合成了复合正极材料FCN-MO@CNFs。通过详细的电化学分析，FCN-MO@CNFs表现出优异的电催化活性，并获得了令人满意的低温循环性能。在-40 °C、0.1C下的首次放电容量达到1167.5 mAh g− 1，在0.2C下循环100次后容量留存率达到70.1%。该工作为高性能低温锂硫电池的实用化开发提供了一种新的方法。
Lithium-sulfur (Li-S) battery has high energy density, which demonstrated the potential to conquer the energy storage market. However, in cryogenic circumstances, due to polysulfides (LiPSs) clustering, slow electrochemical reaction, and serious polarization, commercial applications are seriously hindered. Previous works proved that alloy particles enable high-performance low-temperature Li-S batteries, nevertheless, the cycling stability is unsatisfactory due to the serious shuttle effect at low temperatures. Here, FeCoNi nanoparticles (NPs) were introduced as a catalyzer, benefiting from the structural and compositional merits it can synergistically catalyze more kinds of LiPSs. To enhance adsorption ability, MnO NPs were used to anchor LiPSs, thus providing a higher concentration of LiPSs around FeCoNi NPs and MnO NPs, thereby preventing the shuttle effect and enhancing cycling stability at low temperatures. Finally, a composite cathode material FCN-MO@CNFs was synthesized by one-step in-situ pyrolysis. Via detailed electrochemical analysis, FCN-MO@CNFs exhibited excellent electrocatalytic activity and achieved satisfactory low-temperature cycling performance. The initial discharge capacity reaches 1167.5 mAh g−1under −40 °C at 0.1C, and the capacity retention rate reaches 70.1 % after 100 cycles at 0.2C. This work provides a novel method for the practical development of high-performance low-temperature Li-S batteries.