Ti-Substitution Facilitating Anionic Redox and Cycle Stability in a P2-Type Na2/3Mn2/3Ni1/3O2 Na-Ion Battery Cathode DOI
Neha Dagar, Samriddhi Saxena, Hari Narayanan Vasavan

et al.

Energy & Fuels, Journal Year: 2025, Volume and Issue: 39(6), P. 3348 - 3358

Published: Jan. 30, 2025

P2-type layered oxides have attracted tremendous attention as the leading candidate for cathode material in Na-ion batteries owing to their ease of synthesis and facile diffusion. In this work, an in-depth investigation electrochemical behavior (space group P63/mmc) 10% Ti-doped Na2/3Mn2/3Ni1/3O2 is carried out different voltage ranges (1.5-4.0 V, 2.0-4.0 2.0-4.5 V). Ti4+ doping found disrupt Na-ion/vacancy ordering increase Na-O2 layer spacings, which results improved rate performance (~68 mAh g-1 at 5C V range). range, Na2/3Mn0.567Ti0.100Ni1/3O2 (NMNT) exhibits a reduced initial specific discharge capacity 140 significantly retention 71% after 100 cycles due enhanced reversibility anionic redox. Better charge-discharge cycling stability NMNT (80% 0.33C 1.5-4.0 range) evidences Ti4+-induced disruption cooperative Jahn-Teller distortion. Galvanostatic intermittent titration confirm higher Na+ diffusion coefficients NMNT. Interestingly, marginally cathode-electrolyte interphase resistance endorsed by impedance measurements, while overall cell charge-transfer are much lower (by ~45% ~56.7%, respectively) than Na2/3Mn2/3Ni1/3O2.

Language: Английский

Elevating the Concentration of Na Ions to 1 in P2 Type Layered Oxide Cathodes DOI Open Access
Hari Narayanan Vasavan, Samriddhi Saxena,

Velaga Srihari

et al.

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 16, 2025

Abstract Layered oxide cathodes, particularly those with P2 and P3 type structures, have lower specific capacities limited by the Na‐ion content in their structure. In this study, Na is elevated to its uppermost limit a cathode. The material synthesized monophasic P3, (with minor O3 phase), biphasic P3/P2 configuration. During electrochemical testing, compounds exhibited excellent performance, reaching 102 87 mAh g −1 , respectively, at 6C. A full cell fabricated using cathode demonstrated capacity of 123 0.1C retained 90% initial after 200 cycles 0.2C. structural integrity both materials supported operando synchrotron X‐ray diffraction data, which showed no phase transformations showing only 0.78% variation unit volume. These findings highlight transformative potential achieving high concentrations P2‐type materials, paving way for developing high‐performance sodium‐ion batteries.

Language: Английский

Citations

1
Probing the Compositional and Structural Effects on the Electrochemical Performance of Na(Mn‐Fe‐Ni)O2 Cathodes in Sodium‐Ion Batteries DOI Creative Commons
Samriddhi Saxena, Hari Narayanan Vasavan, Neha Dagar

et al.

Battery energy, Journal Year: 2025, Volume and Issue: unknown

Published: March 22, 2025

ABSTRACT This study systematically investigates an Mn‐Fe‐Ni pseudo‐ternary system for Na(Mn‐Fe‐Ni)O 2 cathodes, focusing on the effects of varying transition metal fractions structural and electrochemical properties. X‐ray diffraction reveals that increasing Mn content induces biphasic behavior. A higher Ni reduces c parameter, while Fe concentrations expand lattice. Average particle size increases with increase in Fe/Ni ratio. NaMn 0.500 0.125 0.375 O delivers a high specific capacity ~149 mAh g⁻¹ 2.0–4.0 V range. Galvanostatic charge‐discharge dQ/dV versus curves suggest Ni/Fe ratio > 1 enhances lowers voltage polarization materials. 0.250 demonstrated best rate performance, exhibiting 85.7% at 1C 69.7% 3C, compared to 0.1C, 0.625 (MFN‐512) excelled cyclic stability, retaining 93% after 100 cycles. The performance MFN‐512 full cell configuration was studied hard carbon as anode, resulting ~92 g −1 nominal ~2.9 0.1C rate, demonstrating its potential practical applications. Transmission electron microscopy confirmed nature MFN‐512, columnar growth P2 O3 phases. Electrochemical impedance spectroscopy revealed better‐performing samples have lower charge transfer resistance. Operando Synchrotron XRD reversible phase transformations driven by optimized ratios fraction. work outlines systematic approach optimizing low‐cost, high‐performance layered oxides.

Language: Английский

Citations

1
Durable Cu-doped P3-Na0.62Mn1-xCuxO2 Cathodes for High-Capacity Sodium-ion Battery DOI
Lunara Rakhymbay, Zhanar Zhakiyeva, Jiafu Yu

et al.

Journal of Materials Chemistry A, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Cu doping enhances the P3-Na 0.62 Mn 0.75 0.19 O 2 cathode's performance in sodium-ion batteries. It improves electrochemical properties, structural stability, and battery performance, making it a promising material for energy storage applications.

Language: Английский

Citations

0
Ti-Substitution Facilitating Anionic Redox and Cycle Stability in a P2-Type Na2/3Mn2/3Ni1/3O2 Na-Ion Battery Cathode DOI
Neha Dagar, Samriddhi Saxena, Hari Narayanan Vasavan

et al.

Energy & Fuels, Journal Year: 2025, Volume and Issue: 39(6), P. 3348 - 3358

Published: Jan. 30, 2025

P2-type layered oxides have attracted tremendous attention as the leading candidate for cathode material in Na-ion batteries owing to their ease of synthesis and facile diffusion. In this work, an in-depth investigation electrochemical behavior (space group P63/mmc) 10% Ti-doped Na2/3Mn2/3Ni1/3O2 is carried out different voltage ranges (1.5-4.0 V, 2.0-4.0 2.0-4.5 V). Ti4+ doping found disrupt Na-ion/vacancy ordering increase Na-O2 layer spacings, which results improved rate performance (~68 mAh g-1 at 5C V range). range, Na2/3Mn0.567Ti0.100Ni1/3O2 (NMNT) exhibits a reduced initial specific discharge capacity 140 significantly retention 71% after 100 cycles due enhanced reversibility anionic redox. Better charge-discharge cycling stability NMNT (80% 0.33C 1.5-4.0 range) evidences Ti4+-induced disruption cooperative Jahn-Teller distortion. Galvanostatic intermittent titration confirm higher Na+ diffusion coefficients NMNT. Interestingly, marginally cathode-electrolyte interphase resistance endorsed by impedance measurements, while overall cell charge-transfer are much lower (by ~45% ~56.7%, respectively) than Na2/3Mn2/3Ni1/3O2.

Language: Английский

Citations

0