Hollow sphere structured Co₃V₂O₈ as a half-conversion anode material with ultra-high pseudocapacitance effect for potassium ion batteries

Abstract

New electrode materials with high capacity and cycling stability are desirable for potassium ion batteries. Herein, we synthesize a hollow sphere structured Co3V2O8 (HS-Co3V2O8) and use it as a new...

Zero-Strain Sodium Lanthanum Titanate Perovskite Embedded in Flexible Carbon Fibers as a Long-Span Anode for Lithium-Ion Batteries

“…Quantificationally, the pseudocapacitive contribution can be calculated through eq , in which the response current ( i ) under a given potential ( V ) consists of two parts, one from the capacitive-controlled part ( k 1 ( V ) v ) and another one from the diffusion-controlled part ( k 2 ( V ) v 1/2 ). Under a certain potential, the value of k 1 and k 2 remain unchanged …”

Confined Assembly of Hydrated Vanadium Oxide into Hollow Mesoporous Carbon Nanospheres for Fast and Stable K+ Storage Capability

“…The cycling stability of O d -VOH@C is better than those of most vanadium-based anode materials for potassium-ion storage, as shown in Figure 3e. [35][36][37][38][39][40][41][42][43][44] To explore the underlying promotion for the fast and stable K + storage, the redox pseudo-capacitive contribution was measured using the CV method. O d -VOH and O d -VOH@C show a similar CV shape (Figure 4a; Figure S11a, Supporting Information), indicating a similar K + storage mechanism for the two samples.…”

Stable Solid Electrolyte Interface Achieved by Separator Surface Modification for High-Performance Anode-free Potassium Metal Batteries

“…Potassium and sodium ion batteries are attractive because of their low redox potentials, high energy densities, and abundant resources (compared with lithium). − The design of high load and high energy density electrodes is helpful to promote their development and application. − In addition, potassium metal anodes with a lower cost, lower redox potential, and higher abundance are more likely to be used in high power grid energy storage systems. − Unfortunately, the practical application of K metal batteries (KMBs) is restricted by some complex issues. First, the higher chemical activity between K metal and electrolytes as well as the larger volume change during potassium plating/stripping will inevitably lead to the formation of an unstable solid electrolyte interface (SEI) during charge/discharge processes. − In addition, uneven deposition of potassium ions (K + ) will lead to uncontrollable K dendrite formation. , These factors inevitably lead to the low Coulombic efficiency (CE), poor cycle performance, and weak rate performance of K metal anodes …”