材料科学
阴极
氧化物
结合能
电化学
氧气
过渡金属
金属
离子
纳米技术
化学工程
电极
物理化学
原子物理学
催化作用
化学
有机化学
冶金
工程类
物理
作者
Hurong Yao,Xinguang Yuan,Xu‐Dong Zhang,Yüjie Guo,Lituo Zheng,Huan Ye,Ya‐Xia Yin,Jiaxin Li,Yuming Chen,Yiyin Huang,Zhigao Huang,Yu‐Guo Guo
标识
DOI:10.1016/j.ensm.2022.11.005
摘要
O3-type layered oxides NaTmO2 are promising cathodes for Na-ion batteries. However, their practical applications have been greatly hindered by the high air affinity of lattice Na, originating from the reaction of NaTmO2 with H2O/CO2 in air accompanying the production of Na1-xTmO2 and NaOH/Na2CO3, which leads to serious loss of active Na and performance degradation. Here we propose that the air storage stability can be significantly improved by introducing a weak orbital hybridization between transition metal and oxygen layers. The weakened hybridization can facilitate more charge transfer from sodium to oxygen to form a stronger Na−O binding energy, suppressing the unfavorable active Na loss. With the tailored electronic structure in transition metal layer and more active Na being reserved in Na layers, the optimized material exhibits a smooth electrochemical profile, a high capacity of 137.5 mAh g−1, and an improved active Na retention of 90.4% after air exposure, in sharp contrast with plateau curve, 101.1 mAh g−1 and 58.0% of unmodified sample. This research provides a new insight to design air stable layered oxide materials to push their mass production and practical applications.
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