Enhancing Electrochemical Performance of Aluminum-Ion Batteries with Fluorinated Graphene Cathode.

In pursuit of high-performance aluminum-ion batteries, the selection of a suitable positive electrode material assumes paramount importance, and fluorinated graphene (FG) nanostructures have emerged as an exceptional candidate. In the scope of this study, a flexible tantalum foil is coated with FG to serve as the positive electrode for aluminum-ion batteries. FG positive electrode demonstrates a remarkable discharge capacity of 109 mA h g at a current density of 200 mA g, underscoring its tremendous potential for energy storage applications.

The Reverse of Electrostatic Interaction Force for Ultrahigh-Energy Al-Ion batteries.

The two-dimensional (2D) MXenes with sufficient interlayer spacing are promising cathode materials for aluminum-ion batteries (AIBs), yet the electrostatic repulsion effect between the surface negative charges and the active anions (AlCl ) hinders the intercalation of AlCl and is usually ignored. Here, we propose a charge regulation strategy for MXene cathodes to overcome this challenge. By doping N and Co, the zeta potential is gradually transformed from negative (Ti C T ) to near-neutral (Ti CNT ), and finally positive (Ti CNT @Co).

Design Strategies of High-Performance Positive Materials for Nonaqueous Rechargeable Aluminum Batteries: From Crystal Control to Battery Configuration.

Rechargeable aluminum batteries (RABs) have been paid considerable attention in the field of electrochemical energy storage batteries due to their advantages of low cost, good safety, high capacity, long cycle life, and good wide-temperature performance. Unlike traditional single-ion rocking chair batteries, more than two kinds of active ions are electrochemically participated in the reaction processes on the positive and negative electrodes for nonaqueous RABs, so the reaction kinetics and battery electrochemistries need to be given more comprehensive assessments. In addition, although nonaqueous RABs have made significant breakthroughs in recent years, they are still facing great challenges in insufficient reaction kinetics, low energy density, and serious capacity attenuation.

Enhanced storage behavior of quasi-solid-state aluminum-selenium battery.

The current aluminum batteries with selenium positive electrodes have been suffering from dramatic capacity loss owing to the dissolution of SeCl products on the Se positive electrodes in the ionic liquid electrolyte. For addressing this critical issue and achieving better electrochemical performances of rechargeable aluminum-selenium batteries, here a gel-polymer electrolyte which has a stable and strongly integrated electrode/electrolyte interface was adopted. Quite intriguingly, such a gel-polymer electrolyte enables the solid-state aluminum-selenium battery to present a lower self-discharge and obvious discharging platforms.

Alternate Storage of Opposite Charges in Multisites for High-Energy-Density Al-MOF Batteries.

The limited active sites of cathode materials in aluminum-ion batteries restrict the storage of more large-sized Al-complex ions, leading to a low celling of theoretical capacity. To make the utmost of active sites, an alternate storage mechanism of opposite charges (AlCl anions and AlCl cations) in multisites is proposed herein to achieve an ultrahigh capacity in Al-metal-organic framework (MOF) battery. The bipolar ligands (oxidized from 18π to 16π electrons and reduced from 18π to 20π electrons in a planar cyclic conjugated system) can alternately uptake and release AlCl anions and AlCl cations in charge/discharge processes, which can double the capacity of unipolar ligands.

Nonaqueous Rechargeable Aluminum Batteries: Progresses, Challenges, and Perspectives.

For significantly increasing the energy densities to satisfy the growing demands, new battery materials and electrochemical chemistry beyond conventional rocking-chair based Li-ion batteries should be developed urgently. Rechargeable aluminum batteries (RABs) with the features of low cost, high safety, easy fabrication, environmental friendliness, and long cycling life have gained increasing attention. Although there are pronounced advantages of utilizing earth-abundant Al metals as negative electrodes for high energy density, such RAB technologies are still in the preliminary stage and considerable efforts will be made to further promote the fundamental and practical issues.

The effect of graphitization degree of carbonaceous material on the electrochemical performance for aluminum-ion batteries.

Aluminum-ion batteries are currently regarded as the most promising energy storage batteries. The recent development of aluminum-ion batteries has been greatly promoted based on the use of graphitic carbon materials as a positive electrode. However, it remains unclear whether all carbonaceous materials can achieve excellent electrochemical behaviour similar to graphite.

SbSe nanorods with N-doped reduced graphene oxide hybrids as high-capacity positive electrode materials for rechargeable aluminum batteries.

For substantially promoting the unexpected rechargeable capability induced from the dissolution of SbSe positive electrode materials in aluminum batteries, here a novel prototype of a cell assembled by a hybrid of single-crystalline SbSe nanorods and N-doped reduced graphene oxide (SNG) coupled with a modified separator has been developed. With this specific cell design, the hybrid positive electrode material exhibits a high discharge potential (∼1.8 V) with a considerably high initial discharge capacity of up to 343 mA h g at a current density of 500 mA g.

Facile synthesis of Ni(HPO)(OH)/rGO nanorods with enhanced electrochemical performance for aluminum-ion batteries.

The electrochemical behaviors of the ultrashort nickel phosphite nanorods supported on reduced graphene oxide (Ni(HPO)(OH)/rGO nanorods), as a candidate for cathodic applications in aluminum-ion batteries, are firstly investigated. Ni(HPO)(OH)/rGO nanorods are synthesized by a facile solvothermal process. Ni(HPO)(OH) and Ni(HPO)(OH)/rGO cathodes both possess very high initial discharge capacities of 132.

Ordered WO nanorods: facile synthesis and their electrochemical properties for aluminum-ion batteries.

In this work, we have synthesized ordered WO nanorods via a facile hydrothermal process. And the series WO nanorods with oxygen vacancies are obtained via a subsequent thermal reduction process. The formation mechanisms of WO nanorods with different oxygen vacancies are proposed.

Exfoliation Mechanism of Graphite Cathode in Ionic Liquids.

Graphene has been successfully electrochemically exfoliated by electrolysis of cathode graphite in the aluminum-ion battery with ionic liquid electrolyte comprising AlCl and 1-ethyl-3-methylimidazolium chloride ([EMIm]Cl). The AlCl, AlCl, etc., intercalation into graphite flakes in ionic liquid of the aluminum-ion battery by different electrolysis processes to exfoliate graphite has been researched in detail.

High-Performance Aluminum-Ion Battery with CuS@C Microsphere Composite Cathode.

On the basis of low-cost, rich resources, and safety performance, aluminum-ion batteries have been regarded as a promising candidate for next-generation energy storage batteries in large-scale energy applications. A rechargeable aluminum-ion battery has been fabricated based on a 3D hierarchical copper sulfide (CuS) microsphere composed of nanoflakes as cathode material and room-temperature ionic liquid containing AlCl and 1-ethyl-3-methylimidazolium chloride ([EMIm]Cl) as electrolyte. The aluminum-ion battery with a microsphere electrode exhibits a high average discharge voltage of ∼1.