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首页> 外文期刊>RSC Advances >An in situ confinement strategy to porous poly(3,4-ethylenedioxythiophene)/sulfur composites for lithium–sulfur batteries
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An in situ confinement strategy to porous poly(3,4-ethylenedioxythiophene)/sulfur composites for lithium–sulfur batteries

机译：锂 - 硫电池多孔聚（3,4-乙二氧基噻吩）/硫复合材料的原位限制策略

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摘要

Lithium–sulfur (Li–S) batteries are receiving intense interest because of their high theoretical energy density and low cost. However, the rapid capacity fading is a significant problem facing the application of Li–S batteries. Herein, we describe an in situ confinement strategy for preparing a porous poly(3,4-ethylenedioxythiophene)/sulfur (pPEDOT/S) composite for Li–S batteries. The as-prepared pPEDOT/S composite exhibits a monodispersed nanostructure with sizes in the range of 400–600 nm. The pPEDOT/S composite electrode exhibits excellent cycling stability and high specific capacity. At a current rate of 0.5C, the pPEDOT/S electrode exhibits a high specific capacity of 883 mA h g ~(?1) and a capacity retention of 71% after 200 cycles. During the charge/discharge process, the porous nanostructure could facilitate rapid electrolyte diffusion and accommodate the volumetric expansion. The chemical interaction between the PEDOT and polysulfides and discharged products could efficiently avoid the dissolution of polysulfides and the irreversible deposition of discharged products. The unique nanostructure plus the excellent electrochemical performances of the composites described in the current study allow for new opportunities to design high-performance electrodes for Li–S batteries.
机译：锂 - 硫（LI-S）电池由于其高理论能量密度和低成本而受到强烈的兴趣。然而，快速的容量衰落是Li-S电池的应用面临的重大问题。在此，我们描述了用于制备用于Li-S电池的多孔聚（3,4-乙二氧基噻吩）/硫（PPTETOT / S）复合材料的原位限制策略。制备的PPyot / S复合材料表现出单分散的纳米结构，尺寸范围为400-600nm。 PPEDOT / S复合电极具有出色的循环稳定性和高比容量。在0.5℃的电流率下，PPEDOT / S电极表现出883mA H G〜（α1）的高比容量，并且在200次循环后的容量保留为71％。在充电/放电过程中，多孔纳米结构可以促进快速电解质扩散并容纳体积膨胀。佩特和多硫化物和排出产品之间的化学相互作用可以有效地避免多硫化物的溶解和排出产品的不可逆沉积。独特的纳米结构加上当前研究中描述的复合材料的优异电化学性能允许新的机会为LI-S电池设计高性能电极。

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