VS₄‐Decorated Carbon Nanotubes for Lithium Storage with Pseudocapacitance Contribution

Abstract

The application of metal oxides and sulfides for lithium‐ion batteries (LIBs) is hindered by the limited Li+ diffusion kinetics and inevitable structural damage. Pseudocapacitance for electrochemical lithium storage provides an effective and competitive solution for developing electrode materials with large capacity, high rate capability, and stability. Herein, a composite composed of VS4 nanoplates tightly bound to carbon nanotubes (VS4/CNTs) is developed to demonstrate pseudocapacitance‐assisted lithium storage. The texture of the assembled VS4 nanoplates supplies efficient electrolyte/ion diffusion, as well as exposed surface for pseudocapacitive behavior. The effective coupling between VS4 and CNTs ensures fast electron transfer and high stability. The VS4/CNTs anode exhibits high capacity of 1144 mAh g−1 at 0.1 A g−1, superior cycling stability (capacity retention of 100 % at 1 A g−1 after 400 cycles), and good rate capability. The pseudocapacitive behavior plays an important role in determining the excellent electrochemical properties, contributing to the increased charge rate and reaching as high as 42 % of the total charge at a scan rate of 1 mV s−1. This study demonstrates the potential application of metal sulfides with pseudocapacitive contribution in LIBs.

Regulating Zinc Deposition Behaviors by the Conditioner of PAN Separator for Zinc‐Ion Batteries

“…The b value close to 0.5 indicates that the corresponding redox reaction is controlled by the diffusion reaction. [ 22 ] In addition, the contribution of capacitance and diffusion control behavior to the whole capacitance indicates that the charge‐storage mechanism of the Zn/PAN/NVO cells is mainly determined by the diffusion process (Figure 3c). The PAN separator does not affect the charge storage mechanism of NVO in AZIBs.…”

A scalable ball milling strategy to endow SnS anode electrodes with free volume property for enhanced electrochemical performance

“…5c, d. The current of the CV can be divided into the diffusion-controlled part and surface absorption/desorptioncontrolled part according to B. E. Conway's law: 39,40…”

Carbon Nanotubes Coupled with Metal Ion Diffusion Layers Stabilize Oxide Conversion Reactions in High-Voltage Lithium-Ion Batteries

“…These results imply the coexistence of diffusion-controlled and surface-mediated processes . The percentage of capacitive current contribution was calculated using a previously reported approach; , the current response i ( v ) is divided into the surface capacitive process ( k 1 v ) and diffusion-controlled processes ( k 2 v 1/2 ) (i.e., i ( v ) = k 1 v + k 2 v 1/2 , where i ( v ), k 1 v , and k 2 v 1/2 correspond to the integral capacity, surface-mediated capacity, and diffusion-controlled capacity, respectively). The values of k 1 and k 2 obtained at different potentials for our anode are shown in Figure S17.…”