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Promoting reaction kinetics of lithium polysulfides by cobalt polyphthalocyanine derived ultrafine Co nanoparticles mono-dispersed on graphene flakes for Li-S batteries

石墨烯片层上单分散聚酞菁钴衍生超细钴纳米颗粒促进 Li-S电池中多硫化锂的反应动力学

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Abstract

Lithium-sulfur (Li-S) batteries have been considered as the next generation high energy storage devices. However, its commercialization has been hindered by several issues, especially the dissolution and shuttle of the soluble lithium polysulfides (LiPSs) as well as the slow reaction kinetics of LiPSs which may make shuttling effect even worse. Herein, we report a strategy to address this issue by in-situ transformation of Co—Nx coordinations in cobalt polyphthalocyanine (CoPPc) into Co nanoparticles (Co NPs) embedded in carbon matrix and mono-dispersed on graphene flakes. The Co NPs can provide rich binding and catalytic sites, while graphene flakes act as ideally LiPSs transportation and electron conducting platform. With a remarkable enhanced reaction kinetics of LiPSs via these merits, the sulfur host with a sulfur content up to 70 wt% shows a high initial capacity of 1048 mA·h/g at 0.2C, good rate capability up to 399 mA·h/g at 2C.

摘要

锂硫(Li-S)电池被认为是下一代具有潜力的高能量存储设备。然而,多硫化锂(LiPSs)的穿梭效 应及其在电解液中的溶解,以及使穿梭效应更加严重的LiPSs 迟滞的转化动力学等问题严重制约了 Li-S 电池的商业化进程。基于此,本文采用了将具有Co—Nx配位结构的聚酞菁钴(CoPPc)原位转化为嵌 入碳基体中的钴纳米颗粒(Co NPs),同时将其单分散在石墨烯片层上的策略来解决上述问题。其中, Co纳米颗粒可以提供丰富的吸附和催化位点,石墨烯片层可以作为良好的LiPSs 传输和电子传导平台。 由于这些优点,将其用于锂硫电池正极时(硫含量高达70 wt%),LiPSs 的反应动力学得到显著增强;在 0.2C时能提供高的初始容量(1048 mA·h/g)及在2C时可达399 mA·h/g的良好倍率性能。

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Authors and Affiliations

  1. School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an, 710049, China

    Xia Chen  (陈霞), Jiang-qi Zhou  (周江奇), Zi-chun Xiao  (肖子纯), Ya-nan Zhou  (周亚男), Qi-ming Chen  (陈启明) & Wei Tang  (唐伟)

  2. State Key Laboratory of Space Power-sources Technology, Shanghai Institute of Space Power-Sources, Shanghai, 200245, China

    Ting-ting Han  (韩婷婷)

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  1. Xia Chen  (陈霞)
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Contributions

TANG Wei, ZHOU Jiang-qi and CHEN Xia undertook the experiment, manuscript writing and revision. XIAO Zi-chun helped to provide SEM images. HAN Ting-ting, CHEN Qi-ming and ZHOU Ya-nan edited the draft of manuscript.

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Correspondence to Wei Tang  (唐伟).

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The authors declare that they have no conflict of interest that could affect the work of this paper.

Foundation item: Project(21905220) supported by the National Natural Science Foundation of China; Project(BK20201190) supported by the Jiangsu Provincial Department of Science and Technology, China; Projects(2018ZDXM-GY-135, 2021JLM-36) supported by the Key Research and Development Plan of Shaanxi Province, China; Project(HG6J003) supported by the Fundamental Research Funds for “Young Talent Support Plan” of Xi’an Jiaotong University, China; Project supported by the “1000-Plan program” of Shaanxi Province, China

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Chen, X., Zhou, Jq., Xiao, Zc. et al. Promoting reaction kinetics of lithium polysulfides by cobalt polyphthalocyanine derived ultrafine Co nanoparticles mono-dispersed on graphene flakes for Li-S batteries. J. Cent. South Univ. 29, 2940–2955 (2022). https://doi.org/10.1007/s11771-022-5134-2

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