Abstract
Mesoporous Li2FeSiO4/C nanocomposites (LFS-FNS and LFS-NS) were prepared from fumed nano silica (FNS) and nano silica (NS) through facile solid-state reactions, respectively. XRD analysis indicates that the crystalline structures of LFS-FNS and LFS-NS are indexed to monoclinic Li2FeSiO4 of P21. SEM results prove that the particle size of LFS-FNS and FNS (25~40 nm) is smaller than that of LFS-NS and NS, revealing the particle size of Li2FeSiO4/C nanocomposites can be tuned by choosing different silica. TEM further indicates Li2FeSiO4 nanoparticles are uniformly dispersed in the amorphous carbon networking of LFS-FNS. Pore structure analysis indicates the external surface areas of LFS-FNS as well as LFS-NS are 51.4 and 36.1 m2 g−1, indicating the pore properties of mesoporous Li2FeSiO4/C nanocomposites can be controlled by using different silica as silicon resource. The reduced particle size and high external surface area shorten the lithium-ion diffusion path and make LFS-FNS possess better electrochemical performance over LFS-NS. The discharge capacity of LFS-FNS is as high as 172 mA h g−1 at 0.1 C.
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This research was supported by the Gansu Provincial Science Fund (1606RJZA180) and the National Nature Science Foundation of China (No. 21466020).
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Zhang, Q., Yan, C., Guo, J. et al. Mesoporous Li2FeSiO4/C nanocomposites with enhanced performance synthesized from fumed nano silica. Ionics 24, 2555–2563 (2018). https://doi.org/10.1007/s11581-017-2399-9
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DOI: https://doi.org/10.1007/s11581-017-2399-9