Revealing the multiple cathodic and anodic involved charge storage mechanism in an FeSe₂ cathode for aluminium-ion batteries by in situ magnetometry

Abstract

Rechargeable aluminium-ion batteries (AIBs) are considered to be promising alternatives for current lithium-ion batteries (LIBs), since they can offer the possibilities of low cost with high energy-to-price ratios. Unlike in...

Architecting Hierarchical WO3 Agglomerates Assembled With Straight and Parallel Aligned Nanoribbons Enabling High Capacity and Robust Stability of Lithium Storage

“…For further comparison, Figures 3D-F illustrate the charge/discharge curves of hierarchical WO 3 agglomerates, WO 3 bricks, and WO 3 micro-spheres under a stationary current density of 100 mA g −1 within the voltage range of 0.01-3.0 V (vs. Li/Li + ). Note that, from all the three electrodes, the difference in discharge-specific capacity is quite obvious between the first two cycles, but achieves stability in the subsequent cycles, which can be possibly explained by the stable surface state and electrochemical reversibility after the initial activation process (Liang et al, 2021a;Wang et al, 2021). However, the hierarchical WO 3 agglomerate electrode exhibits a higher discharge capacity of 487.6 mAh g −1 after the first cycle, much better than WO 3 bricks (377.7 mAh g −1 ) and WO 3 micro-spheres (393.6 mAh g −1 ).…”

“…However, in spite of the mature technology of LIBs, which undergoes uncasting optimization for decades, the LIB systems are still seriously bottlenecked by conventional graphite materials on account of their low theoretical capacities, thus severely restricting the overall energy density of EES devices (Zhang and Qi, 2016;Qu et al, 2019). In this respect, considerable efforts were devoted to design and exploit novel alternative anode materials with larger reversible capacity and energy density (Li H. et al, 2021;Li Q. et al, 2021;Yue et al, 2022). As a renowned part of the potential electrode material family, tungsten trioxide (WO 3 ) has attracted tremendous attention due to its excellent chemical stability, high theoretical capacity (693 mAh g −1 ), and low cost (Yao et al, 2017;Bekarevich et al, 2020).…”

Revealing the Reaction and Fading Mechanism of FeSe2 Cathodes for Rechargeable Magnesium Batteries

“…As shown in Figure 3c, two peaks ascribing to Fe 2p 3/2 and Fe 2p 1/2 of Fe 2 + remained when discharged to 0.1 V. However, tiny peaks for Fe 2p 3/2 and Fe 2p 1/2 of metallic Fe 0 are present at 704.6 and 718.4 eV. [32] This signifies slightly conversion reaction for FeSe 2 upon discharged to 0.1 V (vs. Mg/Mg 2 + ). However, this conversion is of quite a low content as XPS only reflects the surface components, and the XRD results demonstrate the bulk phase did not undergo a conversion reaction.…”

Few‐Layered ReS2@CNTs as a High‐Performance Cathode for Aluminum‐Ion Batteries

“…Overall, the working mechanism during discharging can be summarized as Equations () and (), [ 69–71 ] Upon discharging, the Al anode releases Al 3+ that further reacts with [AlCl 4 ] − to form [Al 2 Cl 7 ] − . At the same time, the intercalation of Al 3+ takes place at the ReS 2 @CNTs cathode.…”