Cation-Selective Dual-Functional Separator as an Effective Polysulfide Barrier and a Li Dendrite Inhibitor for Lithium–Sulfur Batteries,ACS Applied Energy Materials

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Cation-Selective Dual-Functional Separator as an Effective Polysulfide Barrier and a Li Dendrite Inhibitor for Lithium–Sulfur Batteries
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-12-01 , DOI: 10.1021/acsaem.0c01991
Yanhong Yin _{1,

2} , Wanli Zhao _{1,

2} , Aili Wang _{1,

2} , Hongyun Yue _{1,

2} , Zhaoxia Cao _{1,

2} , Zhenpu Shi _{1,

2} , Shaoyu Li ₃ , Shuting Yang _{1,

2}

Affiliation

Lithium–sulfur (Li-S) batteries are deemed to be one of the most promising energy storage devices due to their abundant material sources and high energy density. However, the uncontrollable growth of Li dendrites and the shuttle effect severely deteriorate the cycling performances, and consequently, hamper their practical application. In this research, a cation-selective dual-functional separator was designed by coating a thin layer containing sulfonated polyether ether ketone (SPEEK) polymer and Super P (SP) particles on a commercial polyethylene (PE) separator. Here, SPEEK can offer lithium-ion transport channels and inhibit polysulfide anions through a Coulomb action. SP with excellent electronic conductivity and a relatively large specific surface area can achieve physical adsorption to polysulfide anions and can act as an additional collector to promote electron transport, so as to achieve better electrochemical exploitation of sulfur and ensure the reactivation of captured active substances. The composite separators can adjust the deposition of Li to a certain extent, therefore achieving uniform lithium-ion flux and lithium-ion deposition. As expected, the SP/SPEEK-coated separator batteries show an outstanding Coulomb efficiency of 99% and a superior capacity of 950.7 mA h g^–1, and the capacity retention rate was 77.5% after 500 cycles at 0.5 C. This work provides an effective strategy to suppress the shuttle effect in Li–S batteries.

中文翻译：

阳离子选择性双功能隔板作为锂硫电池的有效多硫化物阻挡层和锂枝晶抑制剂

锂硫（Li-S）电池由于其丰富的材料来源和高能量密度而被认为是最有前途的储能设备之一。然而，Li树枝状晶体的不可控制的生长和穿梭效应严重恶化了循环性能，因此妨碍了它们的实际应用。在这项研究中，通过在商用聚乙烯（PE）隔膜上涂覆包含磺化聚醚醚酮（SPEEK）聚合物和Super P（SP）颗粒的薄层来设计阳离子选择性双功能隔膜。在这里，SPEEK可以提供锂离子传输通道，并通过库仑作用抑制多硫化物阴离子。具有优异的电子导电性和相对较大的比表面积的SP可以实现对多硫化物阴离子的物理吸附，并可以充当促进电子传输的附加捕收剂，从而实现对硫的更好的电化学利用并确保捕获的活性物质的再活化。复合隔板可以在一定程度上调节锂的沉积，从而实现均匀的锂离子通量和锂离子沉积。正如预期的那样，涂有SP / SPEEK的隔膜电池表现出99％的出色库仑效率和950.7 mA hg的出色容量因此实现了均匀的锂离子通量和锂离子沉积。正如预期的那样，涂有SP / SPEEK的隔膜电池表现出99％的出色库仑效率和950.7 mA hg的出色容量因此实现了均匀的锂离子通量和锂离子沉积。正如预期的那样，涂有SP / SPEEK的隔膜电池表现出99％的出色库仑效率和950.7 mA hg的出色容量^–1，在0.5 C下500次循环后，容量保持率为77.5％。这项工作为抑制Li-S电池的穿梭效应提供了有效的策略。

更新日期：2020-12-28

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