Effectively suppressing lithium dendrite growth via an es-LiSPCE single-ion conducting nano fiber membrane,Journal of Materials Chemistry A

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Effectively suppressing lithium dendrite growth via an es-LiSPCE single-ion conducting nano fiber membrane
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020/01/13 , DOI: 10.1039/c9ta12783f
Yang He _{1,

2,

3,

4,

5} , Jiaying Wang _{1,

2,

3,

4,

5} , Yunfeng Zhang _{1,

2,

3,

4,

5} , Shikang Huo _{1,

2,

3,

4,

5} , Danli Zeng _{1,

2,

3,

4,

5} , Yun Lu _{6,

7,

8,

9,

10} , Zhihong Liu _{11,

12,

13,

14} , Deli Wang _{6,

7,

8,

9,

10} , Hansong Cheng _{1,

2,

3,

4,

5}

Affiliation

Lithium metal is a potential candidate for next-generation anode materials. However, the practical application of a lithium metal anode has been hindered by uncontrolled dendrite formation. Herein, a cost-effective single lithium ion conducting polymer electrolyte membrane based on a highly porous lithium sulfonated polyether ether ketone electrospun nanofiber membrane (es-LiSPCE) is designed to serve as both a separator and a lithium ion conductor. Impregnation of the ethylene carbonate (EC)/dimethyl carbonate (DMC) (v/v = 1 : 1) solvent mixture and 1 M LiFP₆ in EC/PC (v/v = 1 : 1) yields gel pure es-LiSPCE and es-LiSPCE/1 M LiFP₆ in an EC/PC (v/v = 1 : 1) membrane, respectively, which display high ionic conductivity, low interfacial compatibility and a high lithium ion transference number. Combined scanning electron microscopy (SEM) images and the long-term stripping/plating cycling test of lithium foil confirm that such a membrane is greatly favorable for inhibiting the formation of a concentration gradient and thus suppressing lithium dendrite growth. In addition, the fully aromatic polyether ether ketone backbone enables high thermal dimensional stability and high polarity and high polarity enables fast electrolyte wetting of the es-LiSPCE membrane. Notably, Li/LiFePO₄ cells fabricated using es-LiSPCE membranes demonstrate promising rate capacity at 6C, and excellent electrochemical stability for 1500 cycles even at 6C. Therefore, it is believed that such an electrolyte can serve as an alternative to conventional polyolefin-based separators for high energy density lithium metal batteries.

中文翻译：

通过es-LiSPCE单离子导电纳米纤维膜有效抑制锂枝晶生长

金属锂是下一代阳极材料的潜在候选者。然而，锂金属阳极的实际应用已经受到不受控制的枝晶形成的阻碍。在本文中，基于高度多孔的锂磺化聚醚醚酮电纺纳米纤维膜（es-LiSPCE）的具有成本效益的单一锂离子导电聚合物电解质膜被设计为既用作隔板又用作锂离子导体。在EC / PC（v / v = 1：1）中浸渍碳酸亚乙酯（EC）/碳酸二甲酯（DMC）（v / v = 1：1）和1 M LiFP _6的溶剂得到纯的es-LiSPCE和es-LiSPCE / 1 M LiFP ₆在EC / PC（v / v = 1：1）膜中分别显示高离子电导率，低界面相容性和高锂离子转移数。结合扫描电子显微镜（SEM）图像和锂箔的长期剥离/镀覆循环测试，证实了这种膜非常有利于抑制浓度梯度的形成，从而抑制了锂枝晶的生长。此外，全芳族聚醚醚酮骨架可实现高的热尺寸稳定性和高极性，而高极性则可实现es-LiSPCE膜的快速电解质润湿。值得注意的是，Li / LiFePO ₄使用es-LiSPCE膜制造的电池在6C时显示出有希望的倍率容量，甚至在6C时也能保持1500个循环的出色电化学稳定性。因此，据信这种电解质可以替代用于高能量密度锂金属电池的常规聚烯烃基隔膜。

更新日期：2020-02-10

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