In Situ Formation of a Cathode-Electrolyte Interface with Enhanced Stability by Titanium Substitution for High Voltage Spinel Lithium-Ion Batteries

Title
In Situ Formation of a Cathode-Electrolyte Interface with Enhanced Stability by Titanium Substitution for High Voltage Spinel Lithium-Ion Batteries
Author
선양국
Keywords
LI-ION; ELECTROCHEMICAL PROPERTIES; LIMN1.5NI0.5-XMXO4 M; NEGATIVE ELECTRODES; LINI0.5MN1.5O4; GRAPHITE; PERFORMANCE; CELLS; DISSOLUTION; CHEMISTRY
Issue Date
2015-07
Publisher
WILEY-BLACKWELL
Citation
ADVANCED MATERIALS INTERFACES, v. 2, NO 10, Page. 1-10
Abstract
Although LiNi0.5Mn1.5O4 (LNMO) high-voltage spinel is a promising candidate for a next generation cathode material, LNMO/graphite full cells experience severe capacity fading caused by degradation reactions at electrode/electrolyte interfaces and consequent active Li+ loss in the cells. In this study, it is first reported that in situ formation of a Ti-O enriched cathode/electrolyte interfacial (CEI) layer on a Ti-substituted LiNi0.5Mn1.2Ti0.3O4 (LNMTO) spinel cathode effectively mitigates electrolyte oxidation and transition metal dissolution, which improves the Coulombic efficiency and cycle life of LNMTO/graphite full cells. The Ti-O enriched CEI layer is produced in situ during an initial cycling of LNMTO as a result of selective Mn and Ni dissolution at its surface, as evidenced by various surface characterizations using X-ray photoelectron spectroscopy, transmission electron microscopy, time-of-flight secondary ion mass spectrometry, Raman spectroscopy, and synchrotron-based soft X-ray absorption spectroscopy. The Ti-O enriched CEI has an advantage over traditional LNMO powder coatings, namely the formation of conformal CEI without compromising electronic conduction pathways between cathode particles.
URI
http://onlinelibrary.wiley.com/doi/10.1002/admi.201500109/fullhttp://hdl.handle.net/20.500.11754/26411
ISSN
2196-7350
DOI
10.1002/admi.201500109
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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