5 years ago

Designing Air-Stable O3-Type Cathode Materials by Combined Structure Modulation for Na-Ion Batteries

Designing Air-Stable O3-Type Cathode Materials by Combined Structure Modulation for Na-Ion Batteries
Yu-Guo Guo, Enyuan Hu, Chuying OuYang, Xiqian Yu, Ya-Xia Yin, Hu-Rong Yao, Jienan Zhang, Eli Stavitski, Yue Gong, Peng-Fei Wang, Xiao-Qing Yang, Lin Gu, Li-Jun Wan
As promising high-capacity cathode materials for Na-ion batteries, O3-type Na-based metal oxides always suffer from their poor air stability originating from the spontaneous extraction of Na and oxidation of transition metals when exposed to air. Herein, a combined structure modulation is proposed to tackle concurrently the two handicaps via reducing Na layers spacing and simultaneously increasing valence state of transition metals. Guided by density functional theory calculations, we demonstrate such a modulation can be subtly realized through cosubstitution of one kind of heteroatom with comparable electronegativity and another one with substantially different Fermi level, by adjusting the structure of NaNi0.5Mn0.5O2 via Cu/Ti codoping. The as-obtained NaNi0.45Cu0.05Mn0.4Ti0.1O2 exhibits an increase of 20 times in stable air-exposure period and 9 times in capacity retention after 500 cycles, and even retains its structure and capacity after being soaked in water. Such a simple and effective structure modulation reveals a new avenue for high-performance O3-type cathodes and pushes the large-scale industrialization of Na-ion batteries a decisive step forward.

Publisher URL: http://dx.doi.org/10.1021/jacs.7b05176

DOI: 10.1021/jacs.7b05176

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