Construction of SPS/LMO/CNT membrane and its electro-driven separation performance for lithium ions

REN Hongwei; WU Xiaogang; WANG Jie; DU Xiao; HAO Xiaogang

doi:10.12434/j.issn.2097-2547.20260125

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Construction of SPS/LMO/CNT membrane and its electro-driven separation performance for lithium ions

更新时间：2026-07-03

- Construction of SPS/LMO/CNT membrane and its electro-driven separation performance for lithium ions
- Pages: 1-10(2026)
- 作者机构：
  
  1.山西能源学院能源化学与材料工程系，山西晋中 030600
  2.潍柴动力股份有限公司内燃机与动力系统全国重点实验室，山东潍坊 261061
  3.山西工程科技职业大学汽车工程学院，山西晋中 030619
  4.太原理工大学化学与化工学院，山西太原 030024
- 作者简介：
- 基金信息：
- DOI：10.12434/j.issn.2097-2547.20260125
  CLC： TQ150.9
- Received：17 March 2026，
  
  Revised：2026-05-04，
  
  Online First：02 July 2026，
- 稿件说明：
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任宏伟,武晓岗,王洁等.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,

REN Hongwei,WU Xiaogang,WANG Jie,et al.Construction of SPS/LMO/CNT membrane and its electro-driven separation performance for lithium ions[J].Low-Carbon Chemistry and Chemical Engineering,
任宏伟,武晓岗,王洁等.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, DOI：10.12434/j.issn.2097-2547.20260125.

REN Hongwei,WU Xiaogang,WANG Jie,et al.Construction of SPS/LMO/CNT membrane and its electro-driven separation performance for lithium ions[J].Low-Carbon Chemistry and Chemical Engineering, DOI：10.12434/j.issn.2097-2547.20260125.

摘要

高镁锂比盐湖卤水的锂离子（Li

）高效选择性分离，是我国盐湖提锂产业发展亟待解决的关键问题。电控离子渗透（ESIP）技术通过整合离子选择性识别与连续渗透传输机理，为Li

高效连续选择性分离提供了有效途径。针对锰酸锂（LMO）本征导电性不足、成膜性能差的问题，以磺化聚苯乙烯（SPS）为黏结基质、碳纳米管（CNT）为导电骨架和LMO为锂选择性识别单元，设计制备了SPS/LMO/CNT三元复合膜电极，并将其应用于ESIP系统中，系统探究了膜的电化学响应机制及其对Li

的分离性能。结果表明，SPS/LMO/CNT膜不仅呈现出双电层电容与赝电容协同响应行为，还可实现Li

的可逆脱嵌。最优LMO负载量（400 mg）下，SPS/LMO/CNT膜对Li

的去除率可达67.86%。在Li

和镁离子共存体系中，SPS/LMO/CNT膜对Li

的选择性可达20以上，展现出优异的Li⁺选择性识别与迁移能力。同时，SPS、LMO和CNT相互作用形成的致密交联网络结构赋予了膜良好的循环稳定性，可实现连续5次Li⁺分离循环。

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 t

he 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

Keywords

references

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