In situ formation of an intimate solid-solid interface by reaction between MgH_(2) and Ti to stabilize metal hydride anode with high active material content  

作　　者：Yixin Chen Atsushi Inoishi Shigeto Okada Hikari Sakaebe Ken Albrecht 

机构地区：[1]Interdisciplinary Graduate School of Engineering Sciences,Kyushu University,Kasuga-koen 6-1,Kasuga,Fukuoka 816-8580,Japan [2]Institute for Materials Chemistry and Engineering,Kyushu University,Kasuga-koen 6-1,Kasuga,Fukuoka 816-8580,Japan [3]Transdisciplinary Research and Education Centre for Green Technology,Kyushu University,Kasuga-koen 6-1,Kasuga,Fukuoka 816-8580,Japan

出　　处：《Journal of Magnesium and Alloys》2024年第8期3193-3203,共11页镁合金学报（英文）

基　　金：supported in part by JSPS KAKENHI grants (nos. JP21K05243 and JP22H04621;grants-in-aid for Scientific Research on Innovative Areas “Interface Ionics”);by a JST grant (no. JPMJFS2132,for the establishment of university fellowships toward the creation of science technology innovation);by the Suzuki foundation

摘　　要：MgH_(2) and TiH_(2) have been extensively studied as potential anode materials due to their high theoretical specific capacities of 2036 and 1024 mAh/g,respectively.However,the large volume changes that these compounds undergo during cycling affects their performance and limits practical applications.The present work demonstrates a novel approach to limiting the volume changes of active materials.This effect is based on mechanical support from an intimate interface generated in situ via the reaction between MgH_(2) and Ti within the electrode prior to lithiation to form Mg and TiH_(2).The resulting Mg can be transformed back to MgH_(2) by reaction with LiH during delithiation.In addition,the TiH_(2) improves the reaction kinetics of MgH_(2) and enhances electrochemical performance.The intimate interface produced in this manner is found to improve the electrochemical properties of a MgH_(2)-Ti-LiH electrode.An exceptional reversible capacity of 800 mAh/g is observed even after 200 cycles with a high current density of 1 mA/cm^(2) and a high proportion of active material(90 wt.%)at an operation temperature of 120℃.This study therefore showcases a new means of improving the performance of electrodes by limiting the volume changes of active materials.

关 键 词：All-solid-state battery In situ formation of solid electrolyte In situ formed intimate interface MgH_(2)anode 

分 类 号：O646[理学—物理化学] TM912[理学—化学]