Exploring hybrid Mg2+/H+ reactions of C@MgMnSiO4 with boosted voltage in magnesium-ion batteries

Insights into the Reaction Mechanisms of Nongraphitic High-Surface Porous Carbons for Application in Na- and Mg-Ion Batteries

“…Theoretically, 156 mA h g −1 is assigned to 0.5 de-inserted Mg 2+ from MgMnSiO 4 (reaction #2). 34 The ICP results confirmed the extraction of 0.46 Mg 2+ corresponding to 143.5 mA h g −1 , which is related to the reachable specific charge (Table 3). By combining the results of the electrochemical curves with the ICP measure- ments, it is observed that the extra capacity could be attributed to the adsorption of bistriflimide ([TFSI] − ) ions and/or magnesium ions on the surface of the carbons.…”

“…The full cells combined an insertion cathode and a EDLC anode. 34 The observed charge capacity is high (314 mA h g −1 ), ascribed to the simultaneous Mg (de)-insertion at the cathode and [TFSI] − adsorption on the anode surface.…”

“…On the other hand, the MgMnSiO 4 cathode used for Mg-ion cells is prepared by a sol−gel procedure and then heated at 900 °C, as reported earlier by our group. 34 The cathodes are prepared by mixing and spreading an 80:10:10 weight ratio mixture of active materials (t-Na 5 V(PO 4 ) 2 F 2 or MgMnSiO 4 ), carbon black, and polyvinylidene fluoride (PVDF) binder onto aluminum or titanium foils and then drying for 2 h at 120 °C under dynamic vacuum. The capacity and energy density of the Na-ion full cell are determined based on the mass of the anode side.…”

Rational Design Strategy of Novel Energy Storage Systems: Toward High‐Performance Rechargeable Magnesium Batteries

“…Chevrel Small 2022, 18, 2200418 phase Mo 6 S 8 , the first reported intercalation cathode material that shows reversible Mg storage capability, delivered mediocre performance such as a low operating voltage (≈1.1 V) and moderate reversible capacity (128 mAh g −1 ). [34,67] Over the past twenty years, extensive efforts have been devoted to the search for alternative cathode materials, which succeeded in discovering a series of potential cathodes, including intercalation type cathodes (Prussian blue analogs [PBA], [68][69][70] polyanionic compounds such as MgMnSiO 4 , [71][72][73][74] layered oxide/sulfide, [75][76][77][78][79][80] spinel oxides such as MgMn 2 O 4 and MgCo 2 O 4 , [81][82][83] etc.) and conversion type cathodes (metal oxides, [84] metal chalcogenides, [85] organic material, [86,87] etc.).…”

A Theoretical Study of Local Electronic–Magnetic Properties for LiCoMnO4 in the Charge and Discharge Process

“…[16] In addition, the replacement of Mn 3þ by low-spin diamagnetic Co 3þ ions yields creation of Mn 4þ in LiMnO 4 , which makes spectroscopic (such as nuclear magnetic resonance (NMR) and electron paramagnetic resonance (EPR)) methods effective for replenishing the XRD techniques to investigate the local environment of TMs and to provide comparable EPR data about Mn 4þ with other multivalent-ion batteries. [17,18] This is because the odd electrons of Mn 4þ (3d 3 ) yield a half-integer spin S ¼ 3/2, which is especially suitable for EPR measurements. For example, the consecutive Li insertion and extraction in LiCoMnO 4 electrodes are studied by using EPR at 213 and 293 K, associated with three distinct signals.…”