title: Lithium recovery from brine using a λ-MnO2/activated carbon hybrid supercapacitor system.
abstract: Lithium is one of the most important elements in various fields including energy storage, medicine manufacturing and the glass industry, and demands for lithium are constantly increasing these days. The lime soda evaporation process using brine lake water is the major extraction method for lithium, but this process is not only inefficient and time-consuming but also causes a few environmental problems. Electrochemical recovery processes of lithium ions have been proposed recently, but the better idea for the silver negative electrodes used in these systems is required to reduce its cost or increase long term stability. Here, we report an electrochemical lithium recovery method based on a λ-MnO2/activated carbon hybrid supercapacitor system. In this system, lithium ions and counter anions are effectively captured at each electrode with low energy consumption in a salt solution containing various cationic species or simulated Salar de Atacama brine lake water in Chile. Furthermore, we designed this system as a flow process for practical applications. By experimental analyses, we confirmed that this system has high selectivity and long-term stability, with its performance being retained even after repetitive captures and releases of lithium ions.
authors: School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Republic of Korea.
authors: Seoni
authors: S
authors: Kim
authors: School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Republic of Korea.
authors: Jaehan
authors: J
authors: Lee
authors: School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Republic of Korea; Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea.
authors: Jin Soo
authors: JS
authors: Kang
authors: School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Republic of Korea.
authors: Kyusik
authors: K
authors: Jo
authors: School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Republic of Korea.
authors: Seonghwan
authors: S
authors: Kim
authors: School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Republic of Korea; Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea.
authors: Yung-Eun
authors: YE
authors: Sung
authors: School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Republic of Korea. Electronic address: jeyong@snu.ac.kr.
authors: Jeyong
authors: J
authors: Yoon
mesh_terms: D017610:Calcium Compounds / Q000378:metabolism; D002606:Charcoal / Q000737:chemistry; D002677:Chile; D055664:Electrochemical Techniques / Q000379:methods*; D008094:Lithium / Q000302:isolation & purification*; D017895:Manganese Compounds / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry* / Q000378:metabolism; D012492:Salts / Q000378:metabolism*; D012972:Sodium Hydroxide / Q000378:metabolism
chemical_list: D017610:Calcium Compounds; D017895:Manganese Compounds; D010087:Oxides; D012492:Salts; C017082:brine; D002606:Charcoal; C004569:soda lime; D012972:Sodium Hydroxide; C027424:manganese oxide; D008094:Lithium
keywords: Activated carbon; Hybrid supercapacitor; Lithium recovery; λ-MnO(2)