Membrane-Free Alkali Metal-Iodide Battery with a Molten Salt

Research output: Contribution to journalResearch articleContributedpeer-review



Batteries with liquid metal electrodes are attractive candidates for sustainable energy-storage applications due to low manufacturing cost and high recyclability. These batteries should be developed for lower operating temperature, higher cell voltage, and membrane-free cell configuration. Herein, a new type of a membrane-free cell relying on liquid alkali metals and iodide is demonstrated. As a proof-of-concept study, membrane-free alkali metal-iodide (A-AI) batteries are constructed by a facile cell assembly introducing current collectors, LiI–LiCl–KI–CsI salt mixture, and an insulator without relying on solid-state mediums for separating electrolytes. For the initial assembly, no active electrode materials are required since they are naturally formed during battery operation. Despite the unoptimized cell construction, the membrane-free A-AI batteries show promising electrochemical performance such as a reliable stability for 250 cycles. The cells are able to handle a high current density and show a relatively low self-discharge rate, which implies the possibility of an iodine-concentrated layer at the bottom of the cell. This is further supported by postmortem analyses using neutron radiography. X-ray photoemission spectroscopy is performed to identify the changes in the iodine concentration in the cell.


Original languageEnglish
Article number2300051
Number of pages12
JournalEnergy technology
Issue number7
Publication statusPublished - 7 Apr 2023

External IDs

WOS 000963931500001


ASJC Scopus subject areas


  • alkali metal-iodide batteries, liquid metal electrodes, low-temperature molten salts, membrane-free energy storage, neutron radiography, Membrane-free energy storage, Neutron radiography, Liquid metal electrodes, Low-temperature molten salts, Alkali metal-iodide batteries