Wei Lai

TL;DR: In this paper, the AC impedance response of mixed ionic and electronic conductors (MIECs) is derived from first principles and quantitatively compared with experimental data, and a broad spectrum of electrical and thermodynamic properties is extracted solely from the measurement of impedance spectra over wide oxygen partial pressure and temperature ranges.

TL;DR: The quantitative results unambiguously confirm the mosaic (particle-by-particle) pathway of intercalation and suggest that the rate-limiting process of charging is initiating the phase transformation by, for example, a nucleation-like event.

TL;DR: Lithium rechargeable microbatteries are demonstrated at the cubic millimeter scale providing energy densities normally achieved only in batteries more than 100 times larger in volume, and two specific materials innovations enable this achievement.

TL;DR: In this paper, formal volume averaging of reformulated generalized Poisson-Nernst-Planck (PNP) equations in the form of concentration and electrochemical potential, or in form of equivalent circuit on a representative porous microstructure, lead to "upscaled" equations similar to those in Newman's model.

TL;DR: In this paper, a connection between the local bonding asymmetry and anharmonic rattling modes in tetrahedrite thermoelectrics, enabled by the chemically active electron lone pairs, was established.