用于锂离子电池的柔性 Co9S8-碳纳米纤维结构：锂存储性质的综合研究,ACS Materials Letters

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用于锂离子电池的柔性 Co9S8-碳纳米纤维结构：锂存储性质的综合研究
ACS Materials Letters ( IF 9.6 ) Pub Date : 2023-04-21 , DOI: 10.1021/acsmaterialslett.3c00199
Daping Qiu ₁ , Biao Zhang ₁ , Teng Zhang ₁ , Tong Shen ₁ , Zhi Fang ₁ , Wanting Zhao ₁ , Junjie Xu ₁ , Yanglong Hou ₁

Affiliation

具有优异理论比容量和中等工作电压的转换型负极被认为是下一代高性能锂离子电池（LIBs）负极的潜在解决方案。然而，转化型负极的实际应用受到缓慢的转化反应动力学和模糊的转化反应机制的阻碍。在此，柔性Co ₉ S ₈ -碳纳米纤维复合泡沫（Co ₉ S ₈@CF-700) 具有独特的类神经节结构，是通过静电纺丝策略巧妙设计和合成的。作为 LIBs 阳极进行测试，碳纳米纤维网络具有突出的导电性、高度可逆的附加容量和出色的缓冲能力，确保了柔性 Co 9 S 8 _@ CF _- 700 相对于 Co ₉ S ₈纳米颗粒的增强的转化反应动力学。此外，提出并应用了一种结合原位 X 射线衍射 (XRD) 和原位磁力测量技术的综合高时空分辨率原位测量系统，以揭示 Co 9 S 的吸附-转化-空间电荷/嵌入锂_存储机制_8个@CF-700。具体而言，原位 XRD 检测中压区的转化反应，原位磁强计监测高压区的电容行为和低压区的空间电荷/嵌入锂存储行为。这项工作为增强锂储存动力学和探索 LIBs 转换型负极的储能机制开辟了一条新途径。

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Flexible Co9S8–Carbon Nanofibers Architecture for Lithium-Ion Batteries: A Comprehensive Study of the Nature of Lithium Storage

A conversion-type anode with superior theoretical specific capacity and medium operating voltage is regarded as a potential solution for the next generation of high-performance lithium-ion batteries (LIBs) anode. However, the practical application of a conversion-type anode is hindered by the sluggish conversion reaction kinetics and ambiguous conversion reaction mechanism. Herein, a flexible Co₉S₈-carbon nanofibers composite foam (Co₉S₈@CF-700) with unique ganglion-like architecture is ingeniously designed and synthesized through an electrospinning strategy. Tested as an LIBs anode, a carbon nanofibers network with prominent conductivity, highly reversible additional capacity, and excellent buffering capability ensure the enhanced conversion reaction kinetics of flexible Co₉S₈@CF-700 relative to Co₉S₈ nanoparticles. Furthermore, a comprehensive high temporal-spatial resolution in situ measurement system combining in situ X-ray diffraction (XRD) and in situ magnetometry techniques is proposed and applied to reveal the adsorption-conversion-space charge/intercalation lithium storage mechanism of Co₉S₈@CF-700. Specifically, in situ XRD detects the conversion reaction in the medium voltage region, and the in situ magnetometry monitors the capacitive behavior in the high-voltage region and the space charge/intercalation lithium storage behavior in the low-voltage region. This work opens a new avenue for enhancing the lithium storage kinetics and exploring the energy storage mechanism of LIBs conversion-type anode.

更新日期：2023-04-21

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