Lithium metal batteries show great potential in energy storage because of their high energy density. Nevertheless, building a stable solid electrolyte interphase (SEI) and restraining the dendrite growth are difficult to realize with traditional liquid electrolytes. Solid and gel electrolytes are considered promising candidates to restrain the dendrites growth, while they are still limited by low ionic conductivity and incompatible interphases. Herein, a dual‐salt (LiTFSI‐LiPF₆) gel polymer electrolyte (GPE) with 3D cross‐linked polymer network is designed to address these issues. By introducing a dual salt in 3D structure fabricated using an in situ polymerization method, the 3D‐GPE exhibits a high ionic conductivity (0.56 mS cm⁻¹ at room temperature) and builds a robust and conductive SEI on the lithium metal surface. Consequently, the Li metal batteries using 3D‐GPE can markedly reduce the dendrite growth and achieve 87.93% capacity retention after cycling for 300 cycles. This work demonstrates a promising method to design electrolytes for lithium metal batteries.

中文翻译：

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用于无枝晶锂金属电池的具有 3D 交联聚合物网络的双盐凝胶聚合物电解质

锂金属电池由于其高能量密度而在储能方面显示出巨大的潜力。然而，传统的液体电解质很难实现构建稳定的固体电解质界面（SEI）并抑制枝晶生长。固体和凝胶电解质被认为是抑制枝晶生长的有希望的候选者，但它们仍然受到低离子电导率和不相容界面的限制。本文设计了具有3D交联聚合物网络的双盐（LiTFSI-LiPF _{6 ）凝胶聚合物电解质（GPE）来解决这些问题。}通过在使用原位聚合方法制造的3D结构中引入双盐，3D-GPE表现出高离子电导率（室温下为0.56 mS cm ^{-1 ），并在锂金属表面上构建了坚固且导电的SEI。}因此，使用3D-GPE的锂金属电池可以显着减少枝晶生长，并在循环300次后实现87.93%的容量保持率。这项工作展示了一种设计锂金属电池电解质的有前途的方法。