Phase Separating Electrode Materials Chemical Inductors

Particle-Level Modeling of the Charge-Discharge Behavior of Nanoparticulate Phase-Separating Li-Ion Battery Electrodes

In nanoparticulate phase-separating electrodes, phase separation inside the particles can be hindered during their charge/discharge cycles even when a thermodynamic driving force for phase separation exists. In such cases, particles may (de)lithiate discretely in a process referred to as mosaic instability. This instability could be the key to elucidating the complex charge/discharge dynamics in nanoparticulate phase-separating electrodes. In this paper, the dynamics of the mosaic instability is studied using Smoothed Boundary Method simulations at the particle level, where the concentration a…

全有机自分离三维纳米架构电化学能量存储器件

All-organic self-separating three-dimensionally nanoarchitected electrochemical energy storage devices

该研究设计了一种全有机三维纳米架构电化学能量存储器件，通过自分离技术实现固态全电池循环，展示了高容量和新设计方法。

Nonequilibrium Thermodynamics of Porous Electrodes

We reformulate and extend porous electrode theory for non-ideal active materials, including those capable of phase transformations. Using principles of non-equilibrium thermodynamics, we relate the cell voltage, ionic fluxes, and Faradaic charge-transfer kinetics to the variational electrochemical potentials of ions and electrons. The Butler-Volmer exchange current is consistently expressed in terms of the activities of the reduced, oxidized and transition states, and the activation overpotential is defined relative to the local Nernst potential. We also apply mathematical bounds on effective …

Entering voltage hysteresis in phase separating materials: revealing the thermodynamic origin of a newly discovered phenomenon and its impact on the electric response of a battery

Hysteresis is a general phenomenon regularly observed in measurements of various materials properties such as magnetism, elasticity, capillary pressure, adsorption, battery voltage etc. Usually, the hysteretic behaviour is an intrinsic property that cannot be avoided or circumvented in dynamic operation of the system. Here we show, however, that at least as regards the hysteretic behaviour of phase-separating battery materials, one can enter (deeply) into the hysteretic loop in specific, yet realistic, transient operating conditions. Within the hysteretic loop a (significant) portion of partic…

原位光谱叠层成像揭示氧化还原活性电极中的动态电荷存储与降解路径

Operando spectro-ptychography reveals dynamical charge-storage and degradation pathways in redox-active electrodes

开发快速原位软X射线光谱叠层成像平台，以纳米级时空分辨率追踪碱性Fe阳极中快速可逆充放电与缓慢溶解-再沉积竞争过程，揭示容量衰减机制。