低碳化学与化工2026，Vol.51Issue(8)：82-91,10.DOI:10.12434/j.issn.2097-2547.20260125
SPS/LMO/CNT膜的构筑及其电驱动锂离子的分离性能研究
Construction of SPS/LMO/CNT membrane and its electro-driven separation performance for lithium ions
摘要
Abstract
The efficient selective separation of lithium ions(Li+)from high-magnesium-lithium ratio salt lake brine is a key issue that urgently needs to be addressed in the development of the salt lake lithium extraction industry in China.Electrochemically switched ion permselectivity(ESIP)technology,by integrating ion selective recognition and continuous permeation transport mechanisms,provides an effective approach for the efficient,continuous and selective separation of Li+.To address the inherent insufficient conductivity and poor film-forming performance of lithium manganese oxide(LMO),a SPS/LMO/CNT ternary composite membrane electrode was designed and prepared using sulfonated polystyrene(SPS)as the binding matrix,carbon nanotubes(CNT)as the conductive framework,and LMO as the Li+selective recognition unit.The membrane electrode was applied in an ESIP system to systematically investigate its electrochemical response mechanism and Li+separation performance.The results demonstrate that the SPS/LMO/CNT membrane not only exhibits a synergistic response behavior of electric double-layer capacitance and pseudocapacitance,but also enables reversible deintercalation and intercalation of Li+.Under the optimal LMO loading amount(400 mg),the Li+removal rate of the SPS/LMO/CNT membrane reaches 67.86%.In the coexisting system of Li+and magnesium ions,the Li+selectivity of the SPS/LMO/CNT membrane is higher than 20,demonstrating excellent Li+selective recognition and migration capabilities.Meanwhile,the dense cross-linked network structure formed by the interactions among SPS,LMO and CNT endows the membrane with good cycling stability,enabling five consecutive Li+separation cycles.关键词
锂离子/电控离子渗透/SPS/LMO/CNT/选择性分离Key words
lithium ion/electrochemically switched ion permselectivity/SPS/LMO/CNT/selective separation分类
化学化工引用本文复制引用
任宏伟,武晓岗,王洁,杜晓,郝晓刚..SPS/LMO/CNT膜的构筑及其电驱动锂离子的分离性能研究[J].低碳化学与化工,2026,51(8):82-91,10.基金项目
山西省高等学校科技创新项目(2024L421) （2024L421）
山西省基础研究计划(自由探索类)项目(202403021222350). （自由探索类）
