Two-Dimensional V₂O₅ Nanosheets as an Advanced Cathode Material for Realizing Low-Cost Aqueous Aluminum-Ion Batteries

Abstract

Aluminum-ion batteries (AIBs) show tremendous promise and advantages, which make them useful for both grid and off-grid energy storage applications. In this paper, an interconnected sheet-like morphology of low-cost V2O5 is reported as a cathode material to improve the capacity, rate capability, and cycling stability of AIBs. The V2O5-based cathode is able to deliver an initial discharge capacity of ∼140 mA h g–1, at a high current density of 0.5 A g–1, with an excellent capacity retention of 96% after 1000 cycles at 1 A g–1, which is among the best cathode performances reported for aqueous AIBs. The fast intercalation and deintercalation of Al3+ between the stacked layers of V2O5 help in ensuring such high-performance characteristics. Notably, the smaller lattice expansion (∼1.4%) of V2O5 indicates that the expansion and contraction of the crystal structure occur reversibly during the charge–discharge process. The stability of the material is established by analyzing the X-ray diffraction patterns of the material after cycling. Such studies have remained ignored in AIBs till date.

Poly(3-Methylthiophene)/Graphene Composite Cathode for Rechargeable Aluminum-Ion Batteries

“…The ability of aluminum to provide three charges per ion is of significant interest. Currently, studies on the mechanism of three-charge transfer often correspond to sulfide (such as VS 2 , FeS 2 , MoS 2 , − − Co 3 S 4 , Mo 6 S 8 , WS 2 ), sulfur, and oxide (such as V 2 O 5 , − CuO, TiO 2 , , Al x MnO 2 , VO 2 , MoO 3 , ) materials. The transfer of multiple charges results in a higher specific capacity.…”

Methyl‐Symmetrically Substituted Poly(3,4‐Dimethylthiophene) as Cathode for Aluminum Ion Batteries

“…Oxides [7][8][9][10][11][12][13][14][15][16][17][18][19][20] and sulfides [21][22][23][24][25][26][27] are commonly used as cathode materials and can achieve high capacity by realizing of threeelectron reaction. However, Al 3 + ion insertion causes a strong interaction with the host and deteriorates the battery performance.…”

Insight into the Storage Mechanism of Sandwich-Like Molybdenum Disulphide/Carbon Nanofibers Composite in Aluminum-Ion Batteries

“…In 2015, Lin introduced a model of AIBs utilizing a novel ionic liquid (AlCl 3 /[EMIm]Cl) as the electrolyte, marking a significant breakthrough in the field of AIBs [ 8 ]. Subsequently, various materials have been integrated into the cathode materials of non-aqueous AIBs, including metal oxides (such as MnO 2 and V 2 O 5 ) [ 9 , 10 ], transition metal chalcogenides (such as CuS 2 , VS 2 , and Co 9 S 8 ) [ 11 , 12 , 13 ], carbon-based materials (such as graphene, graphitic carbon, and graphitic foam) [ 14 , 15 , 16 ], and other materials (such as MXenes and conducting polymers) [ 17 , 18 ]. Among them, carbon-based materials are one of the most used in AIBs, with advantages such as high discharge voltage and good cycle stability.…”