Monovalent cation permselective membranes (MCPMs) manifest remarkable effectiveness and potential in lithium extraction whereas facing the challenge to achieve high permselectivity and high Li⁺ permeability simultaneously. In this work, Zn-TCPP, a kind of two-dimensional nanosheet with abundant negative charges, was successfully synthesized via surfactant-assisted method and introduced into surface cross-linked SPES membrane to fabricate MCPMs. The physicochemical properties, electrochemical properties and Li⁺/Mg²⁺ separation performance of resulted MCPMs were systematically estimated. As ions passing through the membrane, dense PVA/GA crosslinked layer separated Li⁺ and Mg²⁺ by pore-size sieving effect. Afterwards, uniformly distributed Zn-TCPP nanosheets with rich negative charges and physically adsorbed water molecules elevated the charge density and water content in the membrane and thus expedited Li⁺ transporting. Therefore, high Li⁺/Mg²⁺ permselectivity ($P_{{\mathit{Mg}}^{2+}}^{{\mathit{Li}}^{+}}=$ 8.99) and Li⁺ permeation flux ($J_{{\mathit{Li}}^{+}}=$ 9.12 × 10⁻⁹ mol cm⁻²∙s⁻¹) were obtained. Furthermore, membrane surface resistance was reduced from 108.99 Ω cm² to 24.12 Ω∙cm². This study points out the feasibility of the new method for accelerating monovalent ion transport and alleviating the restriction between ion permeation and permselectivity in selective ion exchange membranes.

单价阳离子选择性渗透膜 (MCPM) 在锂提取中表现出显着的有效性和潜力，同时面临着同时实现高选择性渗透率和高 Li ⁺渗透率的挑战。在这项工作中，通过表面活性剂辅助方法成功合成了一种具有丰富负电荷的二维纳米片Zn-TCPP，并将其引入表面交联的SPES膜中以制备MCPMs。系统评价了所得MCPMs的物理化学性质、电化学性质和Li ⁺ /Mg ^{2+分离性能。}当离子穿过膜时，致密的 PVA/GA 交联层将 Li ⁺和 Mg ^2+分开通过孔径筛分效应。之后，具有丰富负电荷和物理吸附水分子的均匀分布的 Zn-TCPP 纳米片提高了膜中的电荷密度和水含量，从而加速了 Li ⁺的传输。因此，高的 Li ⁺ /Mg ²⁺渗透选择性（${磷}_{{\mathit{镁}}^{2+}}^{{\mathit{李}}^{+}}=$8.99) 和 Li ⁺渗透通量 (${Ĵ}_{{\mathit{李}}^{+}}=$得到9.12 × 10 ^-9  mol cm ^-2 ∙s ^-1 )。此外，膜表面电阻从 108.99 Ω cm ²降低到 24.12 Ω∙cm ²。该研究指出了加速单价离子传输和缓解选择性离​​子交换膜中离子渗透和渗透选择性限制的新方法的可行性。