In Situ Formation of a Cathode-Electrolyte Interface with Enhanced Stability by Titanium Substitution for High Voltage Spinel Lithium-Ion Batteries
- Authors
- Kim, Jung-Hyun; Pieczonka, Nicholas P. W.; Lu, Peng; Liu, Zhongyi; Qiao, Ruimin; Yang, Wanli; Tessema, Misle M.; Sun, Yang Kook; Powell, Bob R.
- Issue Date
- Jul-2015
- Publisher
- WILEY-BLACKWELL
- Keywords
- capacity fading; cathode/electrolyte interfacial layers; high-voltage spinel; manganese dissolution; Ti-substitution
- Citation
- ADVANCED MATERIALS INTERFACES, v.2, no.10
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED MATERIALS INTERFACES
- Volume
- 2
- Number
- 10
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/24938
- DOI
- 10.1002/admi.201500109
- ISSN
- 2196-7350
- 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.
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