Hydrated Bi‐Ti‐Bimetal Ethylene Glycol: A New High‐Capacity and Stable Anode Material for Potassium‐Ion Batteries

Abstract

Potassium-ion batteries have emerged not only as low-cost alternatives to lithium-ion batteries, but also as high-voltage energy storage systems. However, their development is still encumbered by the scarcity of highperformance electrode materials that can endure successive potassium-ion uptake. Herein, a hydrated Bi-Ti bimetallic ethylene glycol (H-Bi-Ti-EG) compound is reported as a new high-capacity and stable anode material for potassium storage. H-Bi-Ti-EG possesses a long-range disordered layered framework, which helps to facilitate electrolyte ingress into the entire Bi nanoparticles. A suite of spectroscopic analyses reveals the in situ formation Bi nanoparticles within the organic polymer matrix, which can alleviate stresses caused by the huge volume expansion/contraction during deep cycles, thereby maintaining the superior structural integrity of H-Bi-Ti-EG organic anode. As expected, H-Bi-Ti-EG anode exhibits a high capacity and superior long-term cycling stability. Importantly for potassium storage, it can be cycled at current densities of 0.1, 0.5, 1, and 2 Ag −1 for 800, 700, 1000, and even 6000 cycles, retaining charging capacities of 361, 206, 185, and 85.8 mAh g −1 , respectively. The scalable synthetic method along with the outstanding electrochemical performance of hydrated Bi-Ti-EG, which is superior to other reported Bi-based anode materials, places it as a promising anode material for high-performance potassium storage.

Strong coordination interaction in amorphous Sn-Ti-ethylene glycol compound for stable Li-ion storage

“…This observation is a testament to the transformation of C=O to C-C-O-Li, which is partially irreversible and is responsible for the low initial coulombic efficiency of the electrode. However, the partially reversible transformation contributes to the high capacity of Sn-Ti-EG [48,49] . During the initial charge process from states d to g, the evolution of the O K-edge XANES spectra becomes reversible.…”

Insights on advanced g‐C3N4 in energy storage: Applications, challenges, and future

“…44,45 The primary issues concerning positive electrode materials include limited specific capacity, phase transition during charge-discharge cycles, cycle life, and interface reactions. [46][47][48] These challenges call for dedicated research and development efforts to overcome these limitations and unlock the full potential of energy storage technologies. The primary challenges associated with anode materials encompass electrode material agglomeration, specific capacity, safety concerns, phase and volume changes during charge-discharge cycles, cycle life, and rate performance.…”

“…Specifically, electrode materials are categorized into positive and negative types, each presenting its unique merits and drawbacks in the context of energy storage 44,45 . The primary issues concerning positive electrode materials include limited specific capacity, phase transition during charge–discharge cycles, cycle life, and interface reactions 46–48 . These challenges call for dedicated research and development efforts to overcome these limitations and unlock the full potential of energy storage technologies.…”

SnS2 nanoparticles embedded in sulfurized polyacrylonitrile composite fibers for high‐performance potassium‐ion batteries

“…[14] Despite the above advantages, the large radius of K + (1.38 Å) hampers its insertion into electrode materials and induces significant volume changes during electrochemical reactions, incurring cracking or pulverization of electrode materials. [15][16][17] Various anode materials, such as carbonaceous materials, [18][19][20] metal alloys, [21][22][23] metal oxides, [24,25] and metal sulfides, [26][27][28][29] have been extensively studied. Among them, transition metal sulfides are attractive candidates due to their high theoretical specific capacity, low electronegativity, unique crystal structure, and good redox activity.…”