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Effect of Preloading Force on Cycling Stability and Interface Evolution of NaNi1 /3 Fe 1/3 Mn 1/3 O₂/Hard Carbon Sodium-Ion Batteries
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DOI：10.1039/D6NJ02056A.png)
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Abstract
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Compared with lithium-ion batteries; sodium-ion batteries still face problems; such as irreversible changes in the electrochemical cycle process and the expansion force caused by the instability of the cycle interface. In this work; the NaNi1/3Fe1/3Mn1/3O2(NNFM)/Hard Carbon sodium-ion batteries with a capacity of 28.0 Ah are used as the research object; and the different preloading forces (0; 100; 200; 300; 400 and 500 kgf) are applied to them for charging and discharging cycles. The analysis is performed by electrochemical measurement; X-ray diffraction (XRD); X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The experimental results indicate that the battery capacity decreases with the increase of the number of cycles. Specifically; the battery capacity drops the fastest when there is no preload; and the slowest when there is a preload of 300 kgf. Appropriate preload can ensure that all components are in full contact and reduce the interface impedance. It can also inhibit the loss of positive and negative active materials; thus improving the performance and cycle life of sodium-ion batteries. This work has certain guiding significance to improve the cycle life of sodium-ion battery and promote its engineering application in battery pack system.
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