An efficient molten-salt electro-deoxidation strategy enabling fast-kinetics and long-life aluminum-selenium batteries  

作　　者：Jiguo Tu Zheng Huang Cheng Chang Haiping Lei Shuai Wang Shuqiang Jiao 

机构地区：[1]State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing,China [2]School of Chemistry,Chemical Engineering and Biotechnology,Nanyang Technological University,Singapore,Singapore [3]School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing,China [4]School of Electrical and Electronic Engineering,Nanyang Technological University,Singapore,Singapore

出　　处：《SusMat》2024年第1期126-139,共14页可持续发展材料（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Number:51874019;Fundamental Research Funds for the Central Universities,Grant/Award Number:FRF-TP-19-079A1;State Scholarship Fund。

摘　　要：Aluminum-selenium(Al-Se)batteries have been considered as one of the most promising energy storage systems owing to their high capacity,energy density,and cost effectiveness,but Se falls challenges in addressing the shuttle effect of soluble intermediate product and sluggish reaction kinetics in the solid-solid conversion process during cycling.Herein,we propose an unprecedented design concept for fabricating uniform Se/C hollow microspheres with controllable morphologies through low-temperature electro-deoxidation in neutral NaCl-AlCl_(3) molten salt system.Such Se/C hollow microspheres are demonstrated to hold a favorable hollow structure for hosting Se,which can not only suppress the dissolution of soluble intermediate products into the electrolyte,thereby maintaining the structural integrity and maximizing Se utilization of the active material,but also promote the electrical/ionic conductivity,thus facilitating the rapid reaction kinetics during cycling.Accordingly,the as-prepared Se/C hollow microspheres exhibit a high reversible capacity of 720.1 mAh g^(−1)at 500 mA g^(−1).Even at the high current density of 1000 mA g^(−1),Se/C delivers a high discharge capacity of 564.0 mAh g^(−1),long-term stability over 1100 cycles and high Coulombic efficiency of 98.6%.This present work provides valuable insights into short-process recovery of advanced Se-containingmaterials and value-added utilization for energy storage.

关 键 词：aluminum-ion batteries hollow Se/C microspheres long-term cycling stability lowtemperature electro-deoxidation NaCl-AlCl_(3)molten salt 

分 类 号：TM91[电气工程—电力电子与电力传动]