期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 7, 页码 6317-6326出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b17771
关键词
conductive binder; secondary-phase morphology; porous composite electrode; electrochemically active area; electrode microstructural characterization; Li-ion battery
资金
- U.S. Department of Energy [DE-AC36-08GO28308]
- Alliance for Sustainable Energy, LLC
- Computer Aided Engineering for Batteries (CAEBAT HI) program
- U.S. Government
Lithium-ion battery electrodes exhibit complex interplay among multiple electrochemically coupled transport processes, which rely on the underlying functionality and relative arrangement of different constituent phases. The electrochemically inactive solid phases (e.g., conductive additive and binder, referred to as the secondary phase), while beneficial for improved electronic conductivity and mechanical integrity, may partially block the electrochemically active sites and introduce additional transport resistances in the pore (electrolyte) phase. In this work, the role of mesoscale interactions and inherent stochasticity in porous electrodes is elucidated in the context of short-range (interface) and long-range (transport) characteristics. The electrode microstructure significantly affects kinetically and transport-limiting scenarios and thereby the cell performance. The secondary-phase morphology is also found to strongly influence the microstructure-transport-kinetics interactions. Apropos, strategies have been proposed for performance improvement via electrode microstructural modifications.
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