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

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Journal of Magnesium and Alloys 2024年第8期12卷 3357-3369页

作者： Jiaxin Wen Jingdong Yang Xueting Huang Xin Zhang Guangsheng Huang Jingfeng Wang Lingjie Li Fusheng Pan Chongqing Industry Polytechnic College Chongqing 401120PR China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044PR China School of Chemistry and Chemical Engineering Chongqing UniversityChongqing 400044PR China

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 *** 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 *** 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 *** 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 ***,the MLCH electrolyte exhibits decent compatibility with the cathodic materials of *** 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 ***,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

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A non-nucleophilic gel polymer magnesium electrolyte compatible with sulfur cathode

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Nano Research 2020年第10期13卷 2749-2754页

作者： Haiyan Fan Yuxing Zhao Jianhua Xiao Jifang Zhang Min Wang Yuegang Zhang School of Nano-Tech and Nano Bionics University of Science and Technology of ChinaHefei 230026China i-Lab Suzhou Institute of Nano-Tech and Nano BionicsChinese Academy of SciencesSuzhou 215123China Department of Physics Tsinghua UniversityBejing 100084China

Magnesium/sulfur battery(Mg/S)has recently received wide attention due to its high theoretical energy density(3,260 Wh/L)and low *** further improve its safety and flexibility,developing a polymer electrolyte that can be compatible with both electrophilic S and Mg is ***,we report a magnesium chloride-(fluorinated tetraethylene glycolic)borate(MgCl-FTGB)based non-nucleophilic,gel-type polymer electrolyte for Mg/S battery via a facile synthetic method through commercially available *** electrolyte coupled with glass fiber allows reversible Mg deposition/dissolution(100%coulombic efficiency)with low polarization(500μA/cm^2,300/300 mV),and shows a wide electrochemical window of 4.8 V(***/Mg^2+).Mg/S battery assembled with this electrolyte can cycle over 50 times with a high specific discharge capacity retention of over 1,100 mAh/g.

关键词： magnesium/sulfur battery polymer electrolyte non-nucleophilic electrolyte safety

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Boosting the cycling stability of rechargeable magnesium batteries by regulating the compatibility between nanostructural metal sulfide cathodes and non-nucleophilic electrolytes

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Nano Research 2023年第2期16卷 2399-2408页

作者： Xiaolan Xue Xinmei Song Anyang Tao Wen Yan Xiao Li Zhang Zuoxiu Tie Zhong Jin Key Laboratory of Mesoscopic Chemistry of MOE Jiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China School of Materials Science and Physics China University of Mining and TechnologyXuzhou 221116China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Suzhou Tierui New Energy Technology Co.Ltd. Suzhou 215228China Nanjing Tieming Energy Technology Co.Ltd. Nanjing 210093China

Rechargeable magnesium batteries are attractive candidates for energy storage due to their high theoretical specific capacities,free of dendrite formation and natural abundance of ***,the development of magnesium secondary batteries is severely limited by the lack of high-performance cathode materials and the incompatibility of electrode materials with ***,we report the application of CuS nanoflower cathode material based on the conversion reaction mechanism for highly reversible magnesium batteries with boosted electrochemical performances by adjusting the compatibility between the cathode and *** applying non-nucleophilic electrolytes based on magnesium bis(hexamethyldisilazide)and magnesium chloride dissolved in the mixed solvent of tetrahydrofuran and N-butyl-N-methyl-piperidinium bis((trifluoromethyl)sulfonyl)imide(Mg(HMDS)_(2)-MgCl_(2)/THF-PP14TFSI)or magnesium bis(trifluoromethanesulfonyl)imide,magnesium chloride and aluminium chloride dissolved in dimethoxyethane(Mg(TFSI)2-MgCl_(2)-AlCl_(3)/DME),the magnesium batteries with CuS nanoflower cathode exhibit a high discharge capacity of~207 mAh·g^(–1)at 100 mA·g^(–1)and a long life span of 1,000 cycles at 500 mA·g^(–1).This work suggests that the rational regulation of compatibility between electrode and electrolyte plays a very important role in improving the performance of multi-valent ion secondary batteries.

关键词： rechargeable magnesium batteries conversion reaction mechanism CuS nanoflower cathode non-nucleophilic electrolyte cycling lifespan

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