用于固体到固体独立式锂硫阴极的聚吡咯改性硫化聚丙烯腈纳米管中锂离子扩散的电化学增强,Small

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用于固体到固体独立式锂硫阴极的聚吡咯改性硫化聚丙烯腈纳米管中锂离子扩散的电化学增强
Small ( IF 13.0 ) Pub Date : 2023-08-06 , DOI: 10.1002/smll.202303781
Yikun Yi ₁ , Feng Hai ₁ , Jingyu Guo ₁ , Xin Gao ₁ , Wenting Chen ₁ , Xiaolu Tian ₁ , Wei Tang ₁ , Weibo Hua ₁ , Mingtao Li _{1,

2}

Affiliation

锂硫化聚丙烯腈（Li-SPAN）电池的能量密度长期以来因硫含量低而受到影响。尽管独立式电极可以显着减少非容量质量贡献，但缓慢的本体反应动力学仍然限制电化学性能。在这方面，引入一种新型电化学活性添加剂聚吡咯（PPy）来构建PAN纳米管作为硫载体。这种中空通道极大地促进了电极内的电荷传输并增加了硫含量。电化学测试和模拟均表明，SPANPPy-1%正极比SPAN正极具有更大的锂离子扩散系数和更均匀的相界面。因此，显着提高了性能和速率特性，并在高硫负载或贫电解质条件下实现了良好的出口。进一步进行原位和半原位表征，以证明硫化锂的成核生长和电极表面结构的演变。这种类型的电化学活性添加剂为高能量密度锂硫电池的实施提供了良好的支持。

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Electrochemical Enhancement of Lithium-Ion Diffusion in Polypyrrole-Modified Sulfurized Polyacrylonitrile Nanotubes for Solid-to-Solid Free-Standing Lithium–Sulfur Cathodes

The energy density of lithium-sulfurized polyacrylonitrile (Li-SPAN) batteries has chronically suffered from low sulfur content. Although a free-standing electrode can significantly reduce noncapacity mass contribution, the slow bulk reaction kinetics still constrain the electrochemical performance. In this regard, a novel electrochemically active additive, polypyrrole (PPy), is introduced to construct PAN nanotubes as a sulfur carrier. This hollow channel greatly facilitates charge transport within the electrode and increases the sulfur content. Both electrochemical tests and simulations show that the SPANPPy-1% cathode possesses a larger lithium-ion diffusion coefficient and a more homogeneous phase interface than the SPAN cathode. Consequently, significantly improved capabilities and rate properties are achieved, as well as decent exportations under high-sulfur-loading or lean-electrolyte conditions. In-situ and semi-situ characterizations are further performed to demonstrate the nucleation growth of lithium sulfide and the evolution of the electrode surface structure. This type of electrochemically active additive provides a well-supported implementation of high-energy-density Li-S batteries.

更新日期：2023-08-06

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