Nan Wang,Yanna NuLi,Shuojian Su,Jun Yang,Jiulin Wang
A comparative study on the effects of different binders on the electrochemical performance of rechargeable magnesium batteries with Mo 6 S 8 cathode is conducted for the first time. The selected binders are commercial organic-soluble polyvinylidene fluoride (PVDF), water-soluble poly(acrylic acid) (PAA), poly(vinyl alcohol) (PVA), gelatin, sodium alginate (SA) and Beta-cyclodextrin (β-CD). The binders significantly affect the physical properties, thus the electrochemical performance of Mo 6 S 8 cathode. Compared with those using traditional PVDF binder, Mo 6 S 8 electrodes with PAA and PVA exhibit enhanced cycling stabilities and rate capabilities, which are attributed to the improved cohesion among the electrode constituents and adhesion between the electrode laminate and the current collector. In addition, the anodic stability of these binders is not only related to the chemical structure of binders, but also to the uniformity of electrode surface . SA binder shows low anodic stability duo to containing easily oxidized groups. Non-uniform electrode surface decreases the anodic stability of PVDF based Mo 6 S 8 electrode. Gelatin can be used as a binder in the formulation of high voltage cathodes for rechargeable magnesium batteries.
Feilure Tuerxun,Yasen Abulizi,Yanna NuLi,Shuojian Su,Jun Yang,JiuLin Wang
High concentration magnesium borohydride/tetraglyme electrolyte for rechargeable magnesium batteries is simply prepared by dissolving inorganic magnesium salt Mg(BH 4 ) in tetraglyme (TG) ether solvent with good safety. 90 °C heating treatment is performed in the preparation process and LiBH 4 as a chelating agent is added to improve the electrochemical performance. Mg deposition–dissolution performance and the electrochemical window of the electrolyte on non-inert stainless steel (SS), nickel (Ni), copper (Cu) electrodes and inert platinum (Pt) electrode are systematically studied by cyclic voltammetry and constant current discharge–charge measurements. 0.5 mol L −1 heated Mg(BH 4 ) 2 /LiBH 4 /TG ([LiBH 4 ] = 1.5 mol L −1 ) solution shows good electrochemical performance with 2.4 V ( vs . Mg RE) anodic stability on stainless steel, close to 100% Mg deposition/dissolution efficiency and high cycling reversibility . Furthermore, the reversible electrochemical process of Mg intercalation into Mo 6 S 8 cathode with excellent cycling performance in the electrolyte indicates the feasible application in rechargeable magnesium batteries.
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