A Novel Pentanary Metal Oxide Cathode with P2/O3 Biphasic Structure for High-Performance Sodium-Ion Batteries
- Authors
- Liang, Xinghui; Sun, Yang-Kook
- Issue Date
- Oct-2022
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- Fe; Mg; Li co-substitutions; Mn-based layered oxides; multicomponent structures; P2; O3 biphasic cathodes; sodium-ion batteries
- Citation
- ADVANCED FUNCTIONAL MATERIALS, v.32, no.44, pp.1 - 12
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED FUNCTIONAL MATERIALS
- Volume
- 32
- Number
- 44
- Start Page
- 1
- End Page
- 12
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/191148
- DOI
- 10.1002/adfm.202206154
- ISSN
- 1616-301X
- Abstract
- The rapid capacity loss suffered by P2-type Mn-based layered oxide cathode materials, caused by deleterious high-voltage phase transformations and the dissolution of active materials, greatly limits their application in large-scale sodium-ion battery installations. In this study, a novel P2/O3 biphasic cathode is developed using a multi-element (Fe, Mg, and Li) co-substitution strategy. The results of ex situ X-ray diffraction analyses and the absence of significant voltage plateaus in the charge-discharge profiles of cells featuring the proposed cathode indicate that deleterious phase transformations and concomitant lattice mismatch in the high-voltage region are effectively suppressed because of the topotactic intergrown structure of the resulting cathode. The optimized cathode also demonstrates improved structural stability and enhanced Na+ diffusion kinetics, owing to the incorporation of stabilizing dopant pillars and suppressed metal-ion dissolution. Hence, the resulting Na half cell demonstrates a high initial capacity of 170.5 mA h g(-1) at 0.1 C and excellent rate capability (106.6 mA h g(-1) at 10 C). Furthermore, the resulting Na full cell, featuring a hard carbon anode, displays excellent cycling stability (72.1% capacity retention after 400 cycles), demonstrating its practical viability. This study presents the design and optimization of high-performance Mn-based cathodes.
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