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Researchers Zhang Huamin and Li Xianfeng, researchers of the Institute of Energy Storage Technology (DNL17) of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, have made progress in the research of non-fluorine porous ion-conducting membranes for flow batteries.
The team confirmed through research that building a cross-linked network structure can effectively improve membrane selectivity and stability (Advanced Functional Materials, 2015, 25(17): 2583-2589). At the same time, the crosslinked network structure was introduced into the non-fluorine porous ion-conducting membrane pore structure, which greatly improved the selectivity and stability of the non-fluorine porous ion-conducting membrane in the flow cell operating environment. The developed membrane material was in solution. Continuous operation of more than 6,000 cycles in the flow battery environment, the performance remains stable. The related results were published on Advanced Functional Materials (Advanced Functional Materials, 2016, 26(2), 210-218).
In order to solve the contradiction between non-fluorine porous ion conductive membrane selectivity and conductivity, and further improve the performance of non-fluorine porous ion conductive membrane, the team successfully developed high selectivity, high conductivity, and low Cost of non-fluorine porous ion-conducting membrane; The cell membrane assembled by the developed membrane material has an energy efficiency of more than 90% under the charge and discharge conditions of 80 mA/cm2, and after 10,000 cycles of charge-discharge cycles, the cell performance is not significantly attenuated. Excellent stability. The results of this study were selected as the cover was published in Energy & Environmental Science 2016, 9, 441-447, and highly reviewed by reviewers. The reviewer believes that this is a pioneering work from the authoritative research group for flow cells. This work has long-term implications for the development of vanadium flow batteries. (This is a ground breaking membrane work in the field of VRB from a well-respected group. Their effort and novelty are to be commended, which will have immediate and long-lasting impact for the vanadium redox flow battery technology).
The above research results are the new progress made by the team on the original proposal of ion-screening ion-free screening. (Energy & Environmental Science 2013, 6, 776; Energy & Environmental Science 2012, 5, 6299; Energy & Environmental Science 2011, 4, 1147; Energy & Environmental Science 2011 4, 1676; Chemsus Chem 6 (2013) 328; J. Mater Chem. A, 2014, 2, 9524; Chem. Commun 2014, 50, 4596).
Recently, the research team made new progress. The research results were published online in the form of communication in German Applied Chemistry (Angew. Chem. Int. Ed. 55, 2016, 3058-3062).
The research team broke through the shackles of the traditional “ion exchange transfer†mechanism, and originally proposed the concept of “ion sieving conduction†without ion exchange groups (Energy Environ. Sci. 2011, 4, 1676). The ion-conducting membrane is introduced into the flow battery. Based on this, a series of research work has been carried out around the design of high-performance porous ion-conducting membranes and a series of advances have been made. (Energy & Environmental Science, 2016, 9, 441-447, Energy & Environmental Science 2013, 6, 776; Energy & Environmental Science 2012, 5, 6299; Energy & Environmental Science 2011, 4, 1147; Adv. Funct. Mater. , 2015, 25, 2583; Adv. Funct. Mater. 2016, 26, 210-218).
In the study of porous ion-conducting membranes for flow batteries, the most difficult problem lies in the study of its ion transport mechanism. The porous membrane material prepared by traditional phase transformation is generally asymmetric structure, with high pore curvature and poor penetration, and it is difficult to directly verify the mechanism of ion-screening. Therefore, how to accurately prepare an ion-conducting membrane with a pore diameter between the proton radius (<0.24 nm) and the vanadium ion radius (>0.6 nm) and having a through structure is very important. ZSM-35 is a molecular sieve with a FER framework structure. It possesses a vertically intersecting two-dimensional pore structure with a pore size (0.35 nm to 0.54 nm) between the proton radius and the vanadium ion radius. For this reason, the research team successfully introduced it into the porous membrane structure and achieved accurate screening of vanadium ions and protons. The single cell assembled with the prepared film has an energy efficiency of more than 81% under a 200 mA/cm 2 charge and discharge condition. This work has important guiding significance for the development of high-performance porous ion-conducting membranes.
The research work was supported by the National Natural Science Foundation of China, the outstanding young scientists of the Chinese Academy of Sciences, and the Ministry of Education's Energy and Material Chemistry Collaborative Innovation Center.
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