Fabrication of Fe7S8/C flexible nanofibers with nano-buffered spaces and their application in Li-ion batteries,New Journal of Chemistry

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Fabrication of Fe7S8/C flexible nanofibers with nano-buffered spaces and their application in Li-ion batteries
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2020-09-17 , DOI: 10.1039/d0nj02968h
Qianhui Wu _{1,

2,

3,

4} , Renhua Xu _{1,

2,

3,

4} , Chen Qian _{4,

5,

6,

7} , Guowang Diao _{1,

2,

3,

4} , Ming Chen _{1,

2,

3,

4,

8}

Affiliation

Much attention has been paid to freestanding and flexible electrodes of Li-ion batteries (LIBs) in order to match the requirements of the future trend of flexible electronics. In this paper, Fe₇S₈/C flexible nanofibers with nano-buffered spaces are synthesized by an electrospinning and vulcanization process. The Fe₇S₈/C flexible nanofiber film with enough flexibility and high electrical conductivity can be directly punched into a flexible electrode slice without current collector, binder and conductive additives. Experimental results show that the Fe₇S₈/CNF2-700 flexible nanofibers delivers a high reversible specific capacity of 675 mA h g⁻¹ after 400 cycles at a current density of 1 A g⁻¹. Its excellent electrochemical performance is mainly attributed to the fact that the carbon nanofiber affords a conductive pathway and the nano-void between the Fe₇S₈ nanoparticles and carbon matrix provides sufficient buffer space for the volume expansion of Fe₇S₈ during charge and discharge cycles. Therefore, it is quite hopeful that this composite nanofiber will become a potential candidate as an anode material for next-generation flexible LIBs.

中文翻译：

具有纳米缓冲空间的Fe7S8 / C柔性纳米纤维的制备及其在锂离子电池中的应用

为了满足柔性电子的未来趋势的要求，人们已经对锂离子电池（LIB）的独立式和柔性电极给予了极大的关注。本文通过静电纺丝和硫化工艺合成了具有纳米缓冲空间的Fe ₇ S ₈ / C柔性纳米纤维。具有足够柔韧性和高电导率的Fe ₇ S ₈ / C柔性纳米纤维膜可以直接冲压成柔性电极片，而无需集电器，粘合剂和导电添加剂。实验结果表明，Fe ₇ S ₈ / CNF2-700柔性纳米纤维具有675 mA hg ^-1的高可逆比容量。在1 A g ^-1的电流密度下经过400次循环后。其优异的电化学性能主要归因于以下事实：碳纳米纤维提供了导电路径，并且Fe ₇ S ₈纳米颗粒与碳基质之间的纳米空隙为充放电期间Fe ₇ S ₈的体积膨胀提供了足够的缓冲空间。周期。因此，非常有希望该复合纳米纤维将成为潜在的候选物，作为下一代柔性LIB的阳极材料。

更新日期：2020-10-15

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