A Vanadium‐Based Fluoroxide Cathode Material for Lithium‐Ion Storage with High Energy Density

Abstract

High‐performance lithium‐ion batteries (LIBs) are required for the rising energy storage demand, while their development depends mainly on cathode materials. Vanadium‐based compounds are considered to be promising due to the feasibility of multielectron reactions arising from the rich valence states of vanadium (+2 to +5). Herein, for the first time the electrochemical properties of a vanadium‐based fluoroxide, β‐KVOF3, as a cathode for LIBs, are reported. After optimization, a reversible capacity as high as 274 mAh g−1, a stable 300 cycles lifetime, and an energy density comparable to LiFePO4 (650 vs 550 Wh kg−1) are achieved. Experiments and simulation study of reaction mechanism illustrate that such performance originates from the reversible V3+/V5+ redox reaction, high structural stability of β‐KVOF3, and the pseudocapacitive process during charging and discharging. This study reveals that β‐KVOF3 is a promising cathode for Li‐ion storage and provides a new design idea for developing high‐performance LIBs cathode materials.

Microwave assisted synthesis for ϵ-MnO2 nanostructures on Ni foam as for rechargeable Li–O2 battery applications

“…Advancements in energy densities (100 to 250 Wh Kg −1 ) of lithium-ion (Li-ion or LIBs) batteries have played a pivotal role in powering portable electronics over the past two decades [1][2][3][4][5][6][7]. However, theoretical studies indicate that further increases in the energy density of Li-ion batteries may fall short of meeting the long-term requirements for e-mobility and power grid applications.…”

“…Notably, Li-air demonstrates a high theoretical specific energy density (energy stored per unit mass and volume) of approximately 5200 Wh kg −1 . Consequently, rechargeable Li-air (Li-O 2 ) batteries have emerged as a promising contender to serve as the next-generation energy storage and conversion device [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Synthesis and characterization of a new isoxazolone-based nonlinear optical crystal: MPMOI

“…Nonlinear optical (NLO) crystals have attracted more and more attention because of their promising applications in many technology fields, such as THz imaging and spectroscopy, optical data storage, and telecommunications. [1][2][3][4][5][6][7][8][9][10] Inorganic NLO crystals (e.g., ZnGeP 2 , ZnTe, and LiNbO 3 ) for a long time have been hotspot materials due to their excellent linear and nonlinear optical and mechanical properties. [11][12][13] Compared to inorganic crystals, their organic counterparts also have promising applications in some specific regions (e.g., terahertz range) because of their superior macroscopic optical nonlinearity, ultrafast response time, and phase-matching capability.…”

“…Nonlinear optical (NLO) crystals have attracted more and more attention because of their promising applications in many technology fields, such as THz imaging and spectroscopy, optical data storage, and telecommunications. 1–10 Inorganic NLO crystals ( e.g. , ZnGeP 2 , ZnTe, and LiNbO 3 ) for a long time have been hotspot materials due to their excellent linear and nonlinear optical and mechanical properties.…”