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Publication Type : Journal Article
Thematic Areas : Nanosciences and Molecular Medicine
Publisher : Electrochimica Acta
Source : Electrochimica Acta, Volume 235, p.191 - 199 (2017)
Url : http://www.sciencedirect.com/science/article/pii/S0013468617306072
Keywords : Li-ion batteries
Campus : Kochi
School : Center for Nanosciences
Center : Amrita Center for Nanosciences and Molecular Medicine Move, Nanosciences
Department : Nanosciences, Nanosciences and Molecular Medicine
Verified : No
Year : 2017
Abstract : Abstract A scalable wet chemical process for conformal TiO2 coating on silicon nanoparticles is investigated for Li-ion battery applications. The stable core-shell composite nanoparticles along with polyacrylic acid (PAA) binder was studied as an anode in Li-ion batteries and compared with bare-Si as a control. By limiting the charge capacity to 1500 mAh g−1, we established stable cycling (zero fade) for over 50 cycles for the core-shell compared to inferior stability (only 30% capacity retention) of the bare-Si nanoparticles at 0.1C rate. Stable capacity of 800 mAh g−1 at 1C rate over 100 cycles was also demonstrated for the core-shell nanoparticle electrode. Transmission electron microscopy and X-ray photoelectron spectroscopy characterizations indicate that in absence of TiO2 the solid electrolyte interface (SEI) layer which forms around Si was about 8–10 nm and composed of Li2O and LiF. In contrast, the {SEI} layer around the TiO2 shell has been thinner (about 2–3 nm) and composed of LiF and LixPFyOz, that stabilized the surface leading to improved cycling stability. Thinner {SEI} layer and its composition led to lower charge transfer resistance while the interface between the composite and the Cu-current collector has better adhesion compared to the bare-Si electrode. Impedance spectroscopy measurements confirmed the above.
Cite this Research Publication : J. John, Gangaja, B., Shantikumar V Nair, and Dr. Dhamodaran Santhanagopalan, “Conformal coating of TiO2 shell on silicon nanoparticles for improved electrochemical performance in Li-ion battery applications”, Electrochimica Acta, vol. 235, pp. 191 - 199, 2017.