A PF6−-Permselective Polymer Electrolyte with Anion Solvation Regulation Enabling Long-Cycle Dual-Ion Battery,Advanced Materials

当前位置： X-MOL 学术 › Adv. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

A PF6−-Permselective Polymer Electrolyte with Anion Solvation Regulation Enabling Long-Cycle Dual-Ion Battery
Advanced Materials ( IF 27.4 ) Pub Date : 2021-12-24 , DOI: 10.1002/adma.202108665
Hongzhu Jiang _{1,

2} , Xiaoqi Han ₃ , Xiaofan Du ₁ , Zheng Chen ₁ , Chenglong Lu ₁ , Xintong Li ₁ , Huanrui Zhang ₁ , Jingwen Zhao ₁ , Pengxian Han ₁ , Guanglei Cui _{1,

4}

Affiliation

Graphitic carbon that allows reversible anion (de)intercalation is a promising cathode material for cost-efficient and high-voltage dual-ion batteries (DIBs). However, one notorious but overlooked issue is the incomplete interfacial anion desolvation, which not only reduces the oxidative stability of electrolytes, but also results in solvent co-intercalation into graphite layers. Here, an “anion-permselective” polymer electrolyte with abundant cationic quaternary ammonium motif is developed to weaken the PF₆⁻–solvent interaction and thus facilitates PF₆⁻ desolvation. This strategy significantly inhibits solvent co-intercalation as well as enhances the oxidation resistance of electrolyte, ensuring the structural integrity of graphite. As a result, the as-assembled graphite||Li cell achieves a superior cyclability with an average Coulombic efficiency of 99.0% (vs 95.7% for baseline electrolyte) and 87.1% capacity retention after 2000 cycles even at a high cutoff potential of 5.4 V versus Li⁺/Li. Besides, this polymer also forms a robust cathode electrolyte interface, working together to enable a long-life DIB. This strategy of tuning anion coordination environment provides a promising solution to regulate solvent co-intercalation chemistry for DIBs.

中文翻译：

一种具有阴离子溶剂化调节的 PF6−- 选择性渗透聚合物电解质，可实现长循环双离子电池

允许可逆阴离子（脱）嵌入的石墨碳是一种很有前途的阴极材料，可用于具有成本效益的高压双离子电池（DIB）。然而，一个臭名昭著但被忽视的问题是不完全的界面阴离子去溶剂化，这不仅降低了电解质的氧化稳定性，而且导致溶剂共嵌入石墨层。在这里，开发了一种具有丰富阳离子季铵基序的“阴离子选择性渗透”聚合物电解质，以削弱 PF ₆^-溶剂相互作用，从而促进 PF ₆^-去溶剂化。该策略显着抑制了溶剂共嵌入，并增强了电解质的抗氧化性，确保了石墨的结构完整性。因此，组装后的石墨||Li 电池具有出色的循环性能，平均库仑效率为 99.0%（基线电解质为 95.7%），即使在 5.4 V 的高截止电位下，2000 次循环后容量保持率也为 87.1%相对于 Li ⁺ /Li。此外，这种聚合物还形成了坚固的阴极电解质界面，共同作用以实现长寿命的 DIB。这种调节阴离子配位环境的策略为调节 DIB 的溶剂共插层化学提供了一种有前景的解决方案。

更新日期：2021-12-24

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南