Hybrid capacitive deionization with anion-exchange membranes for lithium extraction

Anna Siekierka,Marek Bryjak,B Kaźmierczak,M Kutyłowska,J Danielewicz,H Jouhara,K Piekarska

doi:10.1051/e3sconf/20172200157

Abstract

Lithium is considered to be a critical material for various industrial fields. We present our studies on extraction lithium from diluted aqueous solution by novel hybrid system based on a membrane capacitive deionization and batteries desalination. Hybrid CDI is comprised by a lithium selective adsorbent, activated carbon electrode and anion-exchange membranes. Here, we demonstrated implication of various type of anion-exchange membranes and influence their properties on effective capacity and energy requirements in charge/discharge steps. We described a configuration with anion-exchange membrane characterized by adsorption capacity of 35 mg/g of Li + with 0.08Wh/g and removal efficiency of 60 % of lithium ions, using novel selective desalination technique.

Highlights

The global market for lithium salts is a fast growing and is expected to reach 30$ billion value by 2020
We evaluated a system built with lithium selective adsorbent as a anode, activated carbonaceous electrode for chloride ions capturing coated with anion-exchange membrane that prevented adsorption released lithium on the surface of counter electrode
Its characteristic can be found in Tab

Summary

Introduction

The global market for lithium salts is a fast growing and is expected to reach 30$ billion value by 2020. Information on individual lithium resources has been collected and divided into two main categories: extraction from natural as minerals, salt lakes, underground brines or seawater, and the recycling of lithium from electronic waste and lithium ions batteries [2]. Seawater desalination process require electric or thermal technology to separate saline water into two streams, fresh water with a low concentration of dissolved salts and a concentrated brine stream. A new concept of a “desalination battery” which has configuration similar to CDI, but with different electrode materials, was investigated. In this case, system is consist of cationic sodium insertion electrode and a chloride-capturing anionic electrode, made of Ag [4]. Batteries electrode pose higher specific capacity and lower energy requirement than capacitive deionization [4]

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