Recently, the team of Xianfeng Li, a researcher in the Energy Storage Technology Research Department of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and Zhizhang Yuan, an associate researcher, have made progress in alkaline zinc iron flow battery ion conduction membranes, and prepared high-performance alkaline zinc iron flow battery ion conduction.
Energy storage technology is the key technical support for building a clean, low-carbon, safe and efficient energy system
The energy storage technology of alkaline zinc iron flow battery has the characteristics of low cost, high safety, high open circuit voltage, and environmental friendliness
It has application prospects in the fields of distributed energy storage .
At present, alkaline zinc-iron flow batteries still have stability problems caused by zinc dendrites and zinc accumulation; in addition, the operating current of the battery is relatively low (that is, the battery power density is low), resulting in high system costs
In recent years, the team has used the structural design of ion-conducting membranes to control the charging characteristics of ion-conducting membranes (Nat.
, 2018), thermal conductivity (Angew.
, 2020), and mechanical strength (iScience , 2018), etc.
, achieved the uniform deposition of zinc and greatly improved the cycle life of the battery
In this study, in order to increase the working current density of alkaline zinc-iron flow batteries, the research team introduced hydrotalcite nanomaterials (LDHs) into alkaline zinc-iron flow batteries, and designed and prepared high-performance hydrotalcite composite ion-conducting membranes.
By effectively controlling the size of the hydrotalcite layer spacing and using the rich hydrogen bond network between the hydrotalcite layers, the research team improved the ion selectivity and ion conductivity of the membrane
The alkaline zinc-iron flow battery assembled with the hydrotalcite composite ion-conducting membrane has an energy efficiency of 82% at a working current density of 200 mA/cm 2
In addition, the team also cooperated with Zheng Anmin, a researcher at the Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, and through AIMD molecular dynamics simulations, revealed the rapid transfer mechanism of OH- in the composite film through the Grotthuss mechanism between LDHs layers
The research results provide a new idea for the design of high-performance ion-conducting membranes
The related research results were titled Layered Double Hydroxide Membrane with High Hydroxide Conductivity and Ion Selectivity for Energy Storage Device, which was recently published in "Nat.
Hu Jing, a 2016 doctoral student at Dalian Institute of Physics, is the first author of the paper
The research work was supported by the National Natural Science Foundation of China, the Electrochemical Engineering Laboratory of the Chinese Academy of Sciences, the Youth Innovation Promotion Association of the Chinese Academy of Sciences, and the Cross Innovation Team of the Chinese Academy of Sciences
High-performance alkaline zinc iron flow battery ion conductive membrane