Enhanced charge storage capacity and high rate capabilities of Ni₂Co-layered double hydroxides/expanded-graphite composites as anodes for Li-ion batteries

Abstract

The expanded graphite has been used as a matrix to grow Ni2Co-LDH and this enabled to obtain stability and fast charging capabilities when used as anode for Li-ion batteries. The experimental findings are supported by DFT calculations.

Determination of Hansen Solubility Parameter and In Situ Visualization of Dispersion Stability of Solution-Processed Antimonene

“…Along with that, voltage hysteresis is a crucial parameter to assess the electrode reversibility, which basically represents the gap between peak potentials of oxidation and reduction. A narrower hysteresis indicates better reversibility of the electrode. − The voltage hysteresis for Sb is found to be 0.293 V, whereas it is reduced to only 0.258 V in the case of the Sb/f-CNT composite, suggesting better reversibility in the latter case.…”

NbO2 a Highly Stable, Ultrafast Anode Material for Li- and Na-Ion Batteries

“…The relationship between the measured current ( i ) and the scan rate (ν) at a specific potential can be expressed as , i = a ν b or , 0.25em log ( i ) = log 0.25em a + b log 0.25em ν where a and b are adjustable parameters. The b -value depicts the type of charge storage mechanism and can be computed from the slope of the log ( i ) vs log (ν) plot. , The capacitive process dominates the charge storage mechanism when the b -value is close to 1. In contrast, the diffusion-limited process dominates when close to 0.5 …”

“…The b-value depicts the type of charge storage mechanism and can be computed from the slope of the log (i) vs log (ν) plot. 9,33 The capacitive process dominates the charge storage mechanism when the bvalue is close to 1. In contrast, the diffusion-limited process dominates when close to 0.5.…”

“…In this context, Li-ion batteries (LIBs) and Na-ion batteries (SIBs) are at the forefront of research and have made significant contributions to realizing various applications ranging from portable electronics to automobiles. The electrochemical energy storage devices demand active materials with high energy density, fast-charging capabilities, and long cycling stability. − Graphite is one of the most commonly used anode materials for LIBs, having low specific capacity and limited fast-charging capabilities. − Recently, SIB has also garnered significant attention considering its availability and low cost of sodium resources . For SIB, hard carbon is commonly used as an anode and has similar drawbacks to graphite. − Thus, it is critical to find alternative anode materials with high energy density, high-rate capabilities, and excellent stability for LIB and SIB to realize next-generation batteries. , …”

“…13−15 Thus, it is critical to find alternative anode materials with high energy density, highrate capabilities, and excellent stability for LIB and SIB to realize next-generation batteries. 9,16 In this context, various nanomaterials have been utilized as potential anodes for LIBs and SIBs. However, they suffer from multiple challenges, such as high volume expansion, poor cycling stability, unstable solid-electrolyte interphase (SEI) formation, low Coulombic efficiency, poor electronic conductivity, etc., limiting their applicability.…”