A High-Performance Magnesium Triflate-based Electrolyte for Rechargeable Magnesium Batteries

Magnesium metal batteries (MMBs) have obtained the reputation owing to the high volumetric capacity, low reduction potential, and dendrite‐free deposition behavior of the Mg metal anode. However, the bivalent nature of the Mg2+ causes its strong coulombic interaction with the cathode host, which limits the reaction kinetics and reversibility of MMBs, especially based on oxide cathodes. Herein, a synergetic modulation of host pillaring and electrolyte formulation is proposed to activate the layered V2O5 cathode with expanded interlayers via sequential intercalations of poly(3,4‐ethylenedioxythiophene) (PEDOT) and cetyltrimethylammonium bromide (CTAB). The preservation of bundled nanowire texture, copillaring behavior of PEDOT and CTA+, dual‐insertion mode of Mg2+ and MgCl+ at cathode side enable the better charge transfers in both the bulk and interface paths as well as the interaction mitigation effect between Mg‐species cations and host lattices. The introduction of CTA+ as electrolyte additive can also lower the interface resistance and smoothen the Mg anode morphology. These modifications endow the full cells coupled with metallic Mg anode with the maximized reversible capacity (288.7 mAh g‐1) and superior cyclability (over 500 cycles at 500 mA g‐1), superior to most already reported Mg‐ion shuttle batteries even based on passivation‐resistant non‐Mg anodes or operated at higher temperatures.

Section: Resultsmentioning

confidence: 99%

Maximizing Magnesiation Capacity of Nanowire Cluster Oxides by Conductive Macromolecule Pillaring and Multication Intercalation

Yao

et al. 2021

“…A high average Coulombic efficiency of 99.4% was attained for Mg plating/stripping over 1000 cycles at 0.5 mA cm −2 and 0.1 mAh cm −2 , with stable cycling up to 3 mA cm −2 and 5 mAh cm −2 . [111] The presence of chloride ions has been shown to enhance the electrolyte's compatibility with Mg, and it is also expected to improve the performance of the cathode material by accelerating the oxidation of metal during the charging process. However, chloride-containing electrolytes can cause serious corrosion to non-noble metal current collectors such as Al, Cu, and stainless steel, and so, the use of a good corrosion-resistant material (e.g., Inconel 625, carbon paper or carbon cloth, Mo foil) would be necessary.…”

Section: Enhanced Electrolyte-electrode Compatibilitymentioning

confidence: 99%

Designing Nanostructured Metal Chalcogenides as Cathode Materials for Rechargeable Magnesium Batteries

Regulacio

Nguyen

Horia

et al. 2021

Self Cite

Rechargeable magnesium batteries (RMBs) are regarded as promising candidates for beyond‐lithium‐ion batteries owing to their high energy density. Moreover, as Mg metal is earth‐abundant and has low propensity for dendritic growth, RMBs have the advantages of being more affordable and safer than the currently used lithium‐ion batteries. However, the commercial viability of RMBs has been negatively impacted by slow diffusion kinetics in most cathode materials due to the high charge density and strongly polarizing nature of the Mg2+ ion. Nanostructuring of potential cathode materials such as metal chalcogenides offers an effective means of addressing these challenges by providing larger surface area and shorter migration routes. In this article, a review of recent research on the design of metal chalcogenide nanostructures for RMBs’ cathode materials is provided. The different types and structures of metal chalcogenide cathodes are discussed, and the synthetic strategies through which nanostructuring of these materials can be achieved are described. An organized summary of their electrochemical performance is also presented, along with an analysis of the current challenges and future directions. Although particular focus is placed on RMBs, many of the nanostructuring concepts that are discussed here can be carried forward to other next‐generation energy storage systems.

“…Fast charging strategy for other battery systems such as magnesium batteries is also of great concern. [164,165] Mg deposition tends to form uniform structures without dendrite growth, but issues including the conversion of magnesium polysulfides and the passivation of Mg anode have severe effect on the battery degradation. As ACBEs have high electrical conductivity and can greatly boost the ion mobility, they are very promising in the design of fast charging electrode for magnesium batteries.…”

Section: Other Batteriesmentioning

confidence: 99%

Aligned Carbon‐Based Electrodes for Fast‐Charging Batteries: A Review

Huang

Jiao

et al. 2021

The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/smll.202007676. Fast-charging batteries have attracted great attention, and are anticipated to charge electrical vehicles and consumer electronics to full-capacity in several minutes. However, commercial electrode materials in batteries generally have a limited rate performance and are difficult to be used in fast-charging batteries. Designing electrodes with an aligned structure is an effective way to shorten the ion transport path and improve the rate performance of a battery. The excellent electronic conductivity of carbon-based electrodes is another key factor for increasing the rate capability of rechargeable batteries. Therefore, aligned carbon-based electrodes (ACBEs) can significantly improve the power density by combining the advantages of an aligned structure and carbon-based materials. In this review, the mechanism, advantages, and challenges of ACBEs for fast-charging batteries are evaluated, and then the design and preparation methods of ACBEs based on their different dimensions are summarized, and their applications in different batteries are illustrated. Finally, the future development of ACBEs for fast-charging batteries is considered.