Li⁺ ion-sieve (LIS) films, foams, or granules have been fabricated to immobilize LIS to overcome powder loss for Li extraction from seawater. However, the practical application is still restricted by their low swelling ability and poor flexibility to withstand harsh marine environment for a long time. Here, a highly elastic interconnected porous LIS nanocomposite hydrogel with tunable pore structure and flexibility, as well as good swelling property, is prepared by using LIS (viz. λ-MnO₂) as a pore self-modifier during the in-situ fabrication of polypyrrole (PPy) and polyvinyl alcohol (PVA) interpenetrating hydrogel (denoted as λ-MnO₂@IG). In addition to physical confinement interactions, the strong coordination/chelation and electrostatic interactions between λ-MnO₂ nanoparticles and polymer chains enable well-dispersed λ-MnO₂ nanoparticles to be confined in a rich network structure. Even at a marine environment (pH 8.3), the λ-MnO₂@IG hydrogel exhibits superior Li⁺ adsorption performance (20.6 mg g⁻¹ HMO), outperforming most adsorbents containing LIS. Specially, the porous hydrogel is easily recyclable and exhibits super-stable cyclic Li extraction performance, which are directly attributable to the further-improved pore structure in continuous regeneration process. This study provides a self-regulating strategy to design LIS porous hydrogels with controllable porosity, high flexibility, good swelling ability, and excellent cycle stability to address the growing Li⁺ demanding challenges.

Li ⁺离子筛 (LIS) 薄膜、泡沫或颗粒已被制造来固定 LIS，以克服从海水中提取锂时的粉末损失。然而，由于其溶胀能力低、柔韧性差，无法长期承受恶劣的海洋环境，其实际应用仍受到限制。_{在这里，在原位制造过程中，通过使用LIS（即λ-MnO 2}）作为孔自改性剂，制备了具有可调孔结构和柔韧性以及良好溶胀性能的高弹性互连多孔LIS纳米复合水凝胶。聚吡咯 (PPy) 和聚乙烯醇 (PVA) 互穿水凝胶（表示为 λ-MnO ₂@IG）。除了物理限制相互作用外，λ-MnO ₂纳米粒子和聚合物链之间的强配位/螯合和静电相互作用使分散良好的λ-MnO ₂纳米粒子能够被限制在丰富的网络结构中。即使在海洋环境（pH 8.3）中，λ-MnO ₂ @IG 水凝胶也表现出优异的 Li ⁺吸附性能（20.6 mg g ^-1HMO)，优于大多数含有 LIS 的吸附剂。特别是，多孔水凝胶易于回收并表现出超稳定的循环锂提取性能，这直接归功于连续再生过程中进一步改善的孔结构。本研究提供了一种自调节策略来设计具有可控孔隙率、高柔韧性、良好溶胀能力和出色循环稳定性的 LIS 多孔水凝胶，以应对日益增长的锂^离子需求挑战。