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Title: On the Impact of Mechanics on Electrochemistry of Lithium-Ion Battery Anodes

Journal Article · · JOM. Journal of the Minerals, Metals & Materials Society

Models exploring electrochemistry-mechanics coupling in liquid electrolyte lithium-ion battery anodes have traditionally incorporated stress impact on thermodynamics, bulk diffusive transport, and fracture, while stress-kinetics coupling is more explored in the context of all solid-state batteries. Here, we showcase the existence of strong link between active particle surface pressure and reaction kinetics affecting performance even in liquid electrolyte systems. Traction-free and immobile particle surface mechanical boundary conditions are used to delineate the varying pressure magnitudes in graphite host during cycling. Both tensile and compressive stresses are generated in traction-free case, while a fixed surface subjects the entire particle to a compression state. Pressure magnitudes are nearly two to three orders of magnitude higher for the latter resulting in significant depression of open circuit potential and improvement of exchange current densities compared to stress-free state. The results demonstrate the need for incorporating stress-kinetics linkage in models and provide a rationale for putting battery electrodes under compression to improve kinetics.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO); USDOE
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
2217253
Alternate ID(s):
OSTI ID: 2229363
Report Number(s):
NREL/JA-5700-87942; MainId:88717; UUID:39a67183-607d-4f86-9bf3-839c48111108; MainAdminId:71258
Journal Information:
JOM. Journal of the Minerals, Metals & Materials Society, Vol. 76, Issue 3; ISSN 1047-4838
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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