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| Home > Publications database > Exploring calcium pillaring of O3-type NaNi$_{0.9}$Ti$_{0.1}$O$_2$ cathodes to advance Na-ion battery technology > print |
| Home > Publications database > Exploring calcium pillaring of O3-type NaNi$_{0.9}$Ti$_{0.1}$O$_2$ cathodes to advance Na-ion battery technology > print |
| 001 | 633260 | ||
| 005 | 20250824054430.0 | ||
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| 100 | 1 | _ | |a An, Siyu |0 P:(DE-H253)PIP1107283 |b 0 |
| 245 | _ | _ | |a Exploring calcium pillaring of O3-type NaNi$_{0.9}$Ti$_{0.1}$O$_2$ cathodes to advance Na-ion battery technology |
| 260 | _ | _ | |a Amsterdam |c 2025 |b Elsevier |
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| 520 | _ | _ | |a NaNi$_{0.9}$Ti$_{0.1}$O$_2$ (NNTO), a promising sodium-ion cathode material, is capable of delivering high specific capacities but is compromised by structural degradation at high potentials and poor redox stability. Herein, we introduced varying amounts of Ca$^{2+}$ as pillaring ions into the intercalation sites of NNTO to examine their effect on structure and electrochemical performance. Laboratory X-ray diffraction and charge/discharge testing identified Na$_{0.95}$Ca$_{0.025}$Ni$_{0.9}$Ti$_{0.1}$O$_2$ (CaNNTO) as the optimal composition in terms of interlayer spacing, rate capability, and cycling stability. Specifically, the capacity retention after 200 cycles improved from 27 to 48 %. To elucidate the role of Ca$^{2+}$, synchrotron X-ray diffraction was performed, revealing that CaNNTO undergoes only about 3 % volume change in the initial cycle, compared to about 30 % for NNTO. This reduced volume variation was confirmed by cross-sectional electron microscopy and acoustic emission measurements. Hard and soft X-ray absorption spectroscopy further indicated a more reversible nickel redox (Ni$^{2+}$/Ni$^{3+}$/Ni$^{4+}$) in CaNNTO, and differential electrochemical mass spectrometry demonstrated that Ca$^{2+}$ incorporation helps suppress oxygen loss from the lattice, thereby directly stabilizing the cathode|electrolyte interface. Overall, calcium pillaring is found to effectively mitigate structural collapse and redox instabilities, making CaNNTO a more viable candidate for practical sodium-ion battery applications. |
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| 773 | _ | _ | |a 10.1016/j.cej.2025.160939 |g Vol. 509, p. 160939 - |0 PERI:(DE-600)2012137-4 |p 160939 |t The chemical engineering journal |v 509 |y 2025 |x 1385-8947 |
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