期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 6, 期 15, 页码 6675-6684出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta00206a
关键词
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资金
- National Natural Science Foundation of China [51774251]
- Hebei Science Foundation for Distinguished Young Scholars [B2017203313]
- Hundred Excellent Innovative Talents Support Program in Hebei Province [SLRC2017057]
- open funding from State Key Laboratory of Advanced Technology for Materials Synthesis and Processing (Wuhan University of Technology) [2017-KF-14]
In this work, we report a novel design of mixed P2 + T phase NaxCo0.1Mn0.9O2 (0.44 <= x <= 0.7) with interface rich characteristics for high performance sodium storage, whereby the tunneled T phase offers fast Na ion diffusivity and excellent structural stability, the layered P2 phase contributes to high specific capacity, and the P2 + T phase interface offers additional channels and active sites for charge transfer and excess charge storage. Consequently, the as-prepared NaxCo0.1Mn0.9O2 (0.44 <= x <= 0.7) demonstrates an excellent discharge capacity of 219 mA h g(-1) at a current rate of 0.1C (1C = 176 mA g(-1)), and retains 117 mA h g(-1) even at a high rate of 5C. This outstanding performance is significantly superior to that of pure T-type Na0.44Co0.1Mn0.9O2 and P2-type Na0.7Co0.1Mn0.9O2, and also outperforms state-of-the-art manganese-based cathodes. The kinetic analysis indicates the drastically improved Na+ diffusion coefficient of the P2 + T phase, which is 6 and 200 times that of the pure T and P phases, respectively. The good reversibility and structural stability is evidenced through an ex situ XRD study.
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