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

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

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