期刊
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
卷 45, 期 10, 页码 15036-15048出版社
WILEY
DOI: 10.1002/er.6782
关键词
conversion anode; energy storage; Li‐ ion battery; Na‐ ion battery; sol‐ gel process; volume expansion
资金
- Korea Institute of Science and Technology [2E30202]
- National Research Foundation of Korea [2017M1A2A2044477]
- Ministry of Trade, Industry & Energy of Korea [20012318]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20012318] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
NiCo2O4 nanoparticles with sizes of 5-10 nm were prepared using a simple sol-gel method and evaluated as the anode in Li/Na-cells. The anode exhibited excellent performance in the Li battery but poor cycle retention in the Na battery. Structural analysis revealed significant volume expansion in the Na battery, leading to irreversible challenges for the NiCo2O4 anode.
NiCo2O4 nanoparticles (5-10 nm) were prepared by a simple sol-gel method and evaluated in the Li/Na-cell as an anode. The anode exhibited excellent lithium storage capacity (1050 and 860 mAh g(-1) at specific currents of 0.1 and 0.5 A g(-1), respectively) and outstanding cycling performance of over 200 cycles. However, it showed a moderate sodium storage capacity with poor cycle retention. A clear comparison of the structural stability of the electrode determined via the cross-sectional scanning electron microscopy (SEM) micrographs indicates swelling and extensive volume expansion in the Na cell. The investigations conducted using in situ X-ray diffraction (XRD) and ex situ X-ray absorption spectroscopy (XAS) reveal the limited reduction of Co and Ni oxidation states and a minimal degree of conversion during Na uptake. This study highlights the ability of NiCo2O4 nanoparticles to withstand high mechanical stress during the conversion reaction with Li, thus providing excellent performance. Conversely, the NiCo2O4 anode with Na could not be overcome massive volume expansion and irreversibility by reducing the size of particles in nano-dimension.
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