Rechargeable Mg batteries are one of the most promising candidates for next-generation batteries because of their safety, low cost, and high energy density. However, passivation of the Mg anode by the formation of an ion-blocking interphase layer in common organic electrolytes requires an electrolyte compatible with Mg. Herein, we propose a facile and processable method to fabricate Mg²⁺ ion-permeable protective polymer layers for Mg metal anodes. The trifluoromethanesulfonimide (TFSI) anion can be grafted onto a poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) polymer backbone, significantly amorphizing the structure and boosting Mg²⁺ ion conductivity through the polymer layer. TFSI anion grafting is validated through spectroscopic analyses, and the mechanism of grafting is primarily ascribed to the polarity of the PVDF-HFP molecule. This anion-grafted polymer can form a film-like, high-surface-coverage coating layer on the Mg surface, preventing Mg from directly contacting the electrolyte. The Mg anode with this Mg²⁺ ion-permeable protection layer presents markedly improved performance in both Mg symmetric cells and Mg/V₂O₅ full cells using a common electrolyte of Mg(TFSI)₂ in propylene carbonate. We expect that this study will stimulate Mg battery research through the use of various common organic electrolytes.

可充电镁电池因其安全、低成本和高能量密度而成为下一代电池最有希望的候选者之一。然而，通过在普通有机电解质中形成离子阻挡界面层来钝化 Mg 阳极需要与 Mg 相容的电解质。在此，我们提出了一种简便且可加工的方法来制造用于 Mg 金属阳极的 Mg ²⁺离子可渗透保护聚合物层。三氟甲磺酰亚胺 (TFSI) 阴离子可以接枝到聚 (偏二氟乙烯-共聚-六氟丙烯) (PVDF-HFP) 聚合物骨架上，显着改变结构并提高 Mg ²⁺通过聚合物层的离子传导性。TFSI 阴离子接枝通过光谱分析得到验证，接枝机制主要归因于 PVDF-HFP 分子的极性。这种阴离子接枝聚合物可以在 Mg 表面形成膜状、高表面覆盖率的涂层，防止 Mg 直接接触电解质。具有这种 Mg ^{2+离子可渗透保护层的 Mg 阳极在 Mg 对称电池和使用 Mg(TFSI)} ₂在碳酸亚丙酯中的普通电解质的 Mg/V ₂ O ₅全电池中都表现出显着改善的性能。我们预计这项研究将通过使用各种常见的有机电解质来刺激镁电池的研究。