A non-nucleophilic electrolyte based on all-inorganic salts with conditioning-free characteristic for rechargeable magnesium batteries  

作　　者：Jiaxin Wen Jingdong Yang Xueting Huang Xin Zhang Guangsheng Huang Jingfeng Wang Lingjie Li Fusheng Pan 

机构地区：[1]Chongqing Industry Polytechnic College,Chongqing 401120,PR China [2]National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,PR China [3]School of Chemistry and Chemical Engineering,Chongqing University,Chongqing 400044,PR China

出　　处：《Journal of Magnesium and Alloys》2024年第8期3357-3369,共13页镁合金学报（英文）

基　　金：supported by the Science and Technology Research Program of Chongqing Municipal Education Commission(Grant No.KJQN 202103202);the Doctoral Research Foundation of Chongqing Industry Polytechnic College(Grant No.2022GZYBSZK2-11).

摘　　要：Conditioning-free electrolytes with high reversibility of Mg plating/stripping are of vital importance for the commercialization of the superior rechargeable magnesium batteries(RMBs).In the present work,a non-nucleophilic electrolyte(denoted as MLCH)based on all-inorganic salts of MgCl_(2),LiCl and CrCl_(3) for RMBs is prepared by a straightforward one-step reaction.As a result,the MLCH electrolyte shows the noticeable performance of high ionic conductivity(3.40 mS cm^(−1)),low overpotential(∼46 mV vs Mg/Mg^(2+)),high Coulombic efficiency(∼93%),high anodic stability(SS,∼2.56 V vs Mg/Mg^(2+))and long-term(more than 500 h)cycling stability,especially the conditioning-free characteristic.The main equilibrium species in the MLCH electrolyte are confirmed to be the tetracoordinated anions of[LiCl2(THF)2]−and solvated dimers of[Mg_(2)(μ-Cl)3(THF)6]+.The addition of LiCl can assist the dissolution of MgCl_(2) and activation of the electrode/electrolyte interface,resulting in a superior Mg plating/stripping efficiency.The synergistic effect of LiCl,CrCl_(3),a small amount of HpMS and the absence of polymerization THF enable the conditioning-free characteristic of the MLCH electrolyte.Moreover,the MLCH electrolyte exhibits decent compatibility with the cathodic materials of CuS.The Mg/CuS full cell using the MLCH electrolyte presents a discharge specific capacity of 215 mAh g^(−1)at 0.1 C and the capacity can retain∼72%after 40 cycles.Notably,the MLCH electrolyte has other superiorities such as the broad sources of materials,low-cost and easy-preparation,leading to the potential prospect of commercial application.

关 键 词：Rechargeable magnesium batteries Non-nucleophilic electrolyte All-inorganic salt Conditioning-free Mg plating/stripping 

分 类 号：TM912[电气工程—电力电子与电力传动] O646.1[理学—物理化学]