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Structural effects of anomalous current densities on manganese hexacyanoferrate for Li-ion batteries

Mullaliu, Angelo; Belin, S.; Stievano, L.; Giorgetti, M.; Passerini, Stefano

Abstract:
A battery management system (BMS) plays a pivotal role in providing optimal performance of lithium-ion batteries (LIBs). However, the eventual malfunction of the BMS may lead to safety hazards or reduce the remaining useful life of LIBs. Manganese hexacyanoferrate (MnHCF) was employed as the positive electrode material in a Li-ion half-cell and subjected to five cycles at high current densities (10 A g$_{MnHCF}$$^{−1}$) and to discharge at 0.1 A g$_{MnHCF}$$^{−1}$, instead of classical charge/discharge cycling with initial positive polarization at 0.01 A g$_{MnHCF}$$^{−1}$, to simulate a current sensor malfunctioning and to evaluate the electrochemical and structural effects on MnHCF. The operando set of spectra at the Mn and Fe K-edges was further analyzed through multivariate curve resolution analysis with an alternating least squares algorithm (MCR–ALS) and extended X-ray absorption fine structure (EXAFS) spectroscopy to investigate the structural modifications arising during cycling after the applied electrochemical protocol. The coulombic efficiency in the first cycle was dramatically affected; however, the local structural environment around each photo absorber recovered during charging. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000126019
Veröffentlicht am 16.11.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2076-3417
KITopen-ID: 1000126019
Erschienen in Applied Sciences
Band 10
Heft 21
Seiten Art.-Nr.: 7573
Schlagwörter Prussian blue analog; manganese hexacyanoferrate; MCR-ALS; XAFS; EXAFS; li-ion batteries; battery management system
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