Synergistic Effect of Anchoring Transitional/Interstitial Sites on Boosting Structural and Electrochemical Stability of O3-Type Layered Sodium Oxides DOI
Ke Xue, Shenglong Yang, Feiyan Lai

et al.

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 17(1), P. 1286 - 1294

Published: Dec. 18, 2024

O3-type layered oxides are considered promising cathode materials for next-generation high-energy-density sodium-ion batteries (SIBs). However, they face challenges, such as low rate capacity and poor cycling stability, which arise from structural deformation, sluggish Na+ diffusion kinetics, interfacial side reactions. Herein, a synergistic substitution strategy transitional interstitial sites was adopted to improve the structure stability kinetics of NaNi0.2Fe0.4Mn0.4O2. Simulation results indicate that Co3+/B3+ codoping effectively lowers migration energy barrier. In addition, effect provides ultralow lattice strain during repeated deintercalation/intercalation. situ characterization verified complex phase transformation charge discharge suppressed, thereby significantly improving stability. At 1 3 C, retention modified O3–Na(Ni0.2Fe0.4Mn0.4)0.96Co0.04B0.02O2 (NFMCB) improved 29.6% 1.7% 86.7% 88.6% after 200 cycles, respectively. Even at 10 it could still produce 107.2 mAh·g–1. Furthermore, full cells assembled with this material commercial hard carbon exhibit high density 316.2 Wh·kg–1 80.8% cycles C. It is expected will facilitate commercialization oxides.

Language: Английский

Synergistic Effect of Anchoring Transitional/Interstitial Sites on Boosting Structural and Electrochemical Stability of O3-Type Layered Sodium Oxides DOI
Ke Xue, Shenglong Yang, Feiyan Lai

et al.

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 17(1), P. 1286 - 1294

Published: Dec. 18, 2024

O3-type layered oxides are considered promising cathode materials for next-generation high-energy-density sodium-ion batteries (SIBs). However, they face challenges, such as low rate capacity and poor cycling stability, which arise from structural deformation, sluggish Na+ diffusion kinetics, interfacial side reactions. Herein, a synergistic substitution strategy transitional interstitial sites was adopted to improve the structure stability kinetics of NaNi0.2Fe0.4Mn0.4O2. Simulation results indicate that Co3+/B3+ codoping effectively lowers migration energy barrier. In addition, effect provides ultralow lattice strain during repeated deintercalation/intercalation. situ characterization verified complex phase transformation charge discharge suppressed, thereby significantly improving stability. At 1 3 C, retention modified O3–Na(Ni0.2Fe0.4Mn0.4)0.96Co0.04B0.02O2 (NFMCB) improved 29.6% 1.7% 86.7% 88.6% after 200 cycles, respectively. Even at 10 it could still produce 107.2 mAh·g–1. Furthermore, full cells assembled with this material commercial hard carbon exhibit high density 316.2 Wh·kg–1 80.8% cycles C. It is expected will facilitate commercialization oxides.

Language: Английский

Citations

0