阴极
电化学
钠
材料科学
氧化物
氧化钠
化学工程
相(物质)
离子
动力学
化学
电极
冶金
物理化学
有机化学
工程类
物理
量子力学
作者
Iqra Moeez,Ali Hussain Umar Bhatti,Min-kyung Cho,Dieky Susanto,Muhammad Akbar,Ghulam Ali,Kyung Yoon Chung
摘要
Sodium-ion batteries employ P2-type layered transition metal oxides as promising cathode materials, primarily due to their abundant natural reserves and environmentally friendly characteristics. However, structural instability and complex phase transitions during electrochemical cycling pose significant challenges to their practical applications. Employing cation substitution serves as a straightforward yet effective strategy for stabilizing the structure and improving the kinetics of the active material. In this study, we introduce a honeycomb-layered Na2+xNi2TeO6 (NNTO) cathode material with variable sodium content (x = 0, 0.03, 0.05, 0.10). Physicochemical characterizations reveal that excess sodium content at the atomic scale modifies the surface and suppresses phase transitions, all while preserving the crystal structure. This results in enhanced cyclic performance and improved electrochemical kinetics at room temperature. Furthermore, we investigated the performance of the NNTO cathode material containing 10% excess sodium at a relatively high temperature of 60 ℃, where it exhibits 71.6% capacity retention compared to 60% for the pristine. Overall, our results confirm that a pre-constructed surface layer (induced by excess sodium) effectively safeguards the Ni-based cathode material from surface degradation and phase transitions during the electrochemical processes, thus exhibiting superior capacity retention relative to the pristine NNTO cathode. This study of correlation between structure and performance can potentially be applied for the commercialization of SIBs.
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