Why is a detailed understanding of charge diffusion important?

Detailed understanding of charge diffusion processes in a lithium-ion battery is crucial to enable its systematic improvement. Experimental investigation of diffusion at the interface between activ...

What is the ion transport mechanism in lithium-based batteries?

The composition, structure, and the formation mechanism of the solid–electrolyte interphase (SEI) in lithium-based (e.g., Li-ion and Li metal) batteries have been widely explored in the literature. However, very little is known about the ion transport through the SEI.

What are the two types of diffusion?

The diffusion can be classified into two simple categories: direct exchange mechanism and ring mechanism, as shown in Fig. 2 . [ 18 ] The former is formed by two neighboring atoms moving simultaneously, and the latter corresponds to a ring of three (or more) atoms moving as a group by one atom distance.

What role does diffusion rate play in the formation of Li dendrites?

In the electrolyte solution, the diffusion rate of Li + ions arriving at the anode surface from the bulk electrolyte (similar to the electroplating process) plays a key role in the formation of Li dendrites. 9

Why is diffusion characterized by Brownian motion?

From the microscopic viewpoint, diffusion is characterized by the Brownian motion of atoms or molecules. In solid materials, the amplitude of a particle’s vibration near its equilibrium position at a given temperature is smaller than that at its melting point.

Can a solid phase diffusivity be underestimated if electrolytic diffusion is non-negligible?

In such a case, the solid phase diffusivity may be underestimated if the overpotential caused by the liquid diffusion is non-negligible when compared to that caused by the solid diffusion. To exclude the influence of the electrolytic diffusion, Kang et al. developed an improved GITT method by preparing a high-density bulk sample .