Showing papers by "Gholam-Abbas Nazri published in 2017"
TL;DR: In this article, three types of carbon-based nanostructures are embedded in a paraffin to investigate their heat transfer performance for thermal management applications, and the experimental results indicate that the addition of nanoadditives can improve the heat conduction of solid phase Paraffin with slight latent heat degradation.
125 citations
TL;DR: In this paper, a 3D layer structure of a pouch-type cell is modeled to understand the distribution of temperature and current density across the pouch type Lithium-Ion Battery (LIB), and the results obtained by the 3D model were validated by using experimental results obtained from LIBs.
91 citations
TL;DR: An improved pseudo 3D coupled electrochemical-thermal model that can be implemented into active or passive battery thermal management systems (BTMS) is presented in this paper. But the model does not consider the thermal properties of the battery.
79 citations
TL;DR: In this article, the effects of various operating and design parameters on the thermal performance of a battery module consisted of six building block cells were investigated, and a pseudo 3D electrochemical-thermal model coupled with conjugate heat transfer and fluid dynamics simulations was used to assess the effectiveness of two indirect liquid thermal management approaches under the FUDC driving cycle.
60 citations
TL;DR: The 1Mg-LFS/C nanocomposite delivered the highest initial discharge capacity and also exhibited the best rate capability and cycle stability (94% retention after 100 charge-discharge cycles at 1C).
Abstract: A series of porous Li2Fe1-xMgxSiO4/C (x = 0, 0.01, 0.02, 0.04) nanocomposites (LFS/C, 1Mg-LFS/C, 2Mg-LFS and 4Mg-LFS/C) have been synthesized via a solvo-thermal method using the Pluronic P123 polymer as an in situ carbon source. Rietveld refinement of the X-ray diffraction data of Li2Fe1-xMgxSiO4/C composites confirms the formation of the monoclinic P21 structure of Li2FeSiO4. The addition of Mg facilitates the growth of impurity-free Li2FeSiO4 with increased crystallinity and particle size. Despite having the same percentage of carbon content (∼15 wt%) in all the samples, the 1Mg-LFS/C nanocomposite delivered the highest initial discharge capacity of 278 mA h g-1 (∼84% of the theoretical capacity) at the C/30 rate and also exhibited the best rate capability and cycle stability (94% retention after 100 charge-discharge cycles at 1C). This is attributed to its large surface area with a narrow pore size distribution and a lower charge transfer resistance with enhanced Li-ion diffusion coefficient compared to other nanocomposites.
18 citations
10 Oct 2017
TL;DR: In this article, nano-structured In-doped LiFePO4/C samples were prepared by sol-gel method followed by a selective high temperature (600 and 700 °C) annealing in a reducing environment of flowing Ar/H2 atmosphere.
Abstract: We have prepared nano-structured In-doped (1 mol %) LiFePO4/C samples by sol–gel method followed by a selective high temperature (600 and 700 °C) annealing in a reducing environment of flowing Ar/H2 atmosphere. The crystal structure, particle size, morphology, and magnetic properties of nano-composites were characterized by X-ray diffraction (XRD), scanning electron microsopy (SEM), transmission electron microscopy (TEM), and 57Fe Mossbauer spectroscopy. The Rietveld refinement of XRD patterns of the nano-composites were indexed to the olivine crystal structure of LiFePO4 with space group Pnma, showing minor impurities of Fe2P and Li3PO4 due to decomposition of LiFePO4. We found that the doping of In in LiFePO4/C nanocomposites affects the amount of decomposed products, when compared to the un-doped ones treated under similar conditions. An optimum amount of Fe2P present in the In-doped samples enhances the electronic conductivity to achieve a much improved electrochemical performance. The galvanostatic charge/discharge curves show a significant improvement in the electrochemical performance of 700 °C annealed In-doped-LiFePO4/C sample with a discharge capacity of 142 mAh·g−1 at 1 C rate, better rate capability (~128 mAh·g−1 at 10 C rate, ~75% of the theoretical capacity) and excellent cyclic stability (96% retention after 250 cycles) compared to other samples. This enhancement in electrochemical performance is consistent with the results of our electrochemical impedance spectroscopy measurements showing decreased charge-transfer resistance and high exchange current density.
2 citations