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Abstract

The conventional resources depletion (coal, gas, oil) and the climate change lead to the need for innovation, requiring the use of renewable energy and appropriate storage technologies. This trend involves the development of effective, reliable and cost-effective energy storage units. Our work focus on advanced energy materials for ultra-compact thermal energy storage at high temperatures (300-600掳C). Thus a theoretical study, based on both literature [1-3] and FactSage 7.0庐 software, is performed to compare the stoichiometric peritectic compounds with pure and eutectic ones currently considered (molten salts, metal alloys...). The objective is to know if the peritectics can surpass the performances of these latters. The theoretical results show that the stoichiometric peritectic compounds can provide, at constant temperature and ambient pressure, a potential energy density much higher than pure and eutectic materials. This is due to their capacity to combine all advantages provided by sensible, latent and thermochemical processes. No cutting-edge technology is required to be developped for using them, contrary to the thermochemical heat storage materials [4]. Moreover, we can envision also to use the peritectic compounds in cascade ways enabling hence a consideration of very wide ranges of temperature and energy density, making them applicable to a wider pan of applications. These encouraging results fully justify the choice of stoichiometric peritectic compounds. Now, several experimental attempts are launched to determine the appropriate methods and protocols to synthesize them. To date, our work leads to the successful synthesis of the peritectic compound based on LiOH-LiBr system. Recent Publications 1. Kenisarin M.M (2010) High-Temperature phase change materials for thermal energy storage. Renewable and Sustainable Energy Reviews 27:724-37. 2. Wei G, Wang G, Xu C, Ju X, Xing L, Du X, Yang Y (2018) Selection principles and thermophysical properties of high temperature phase change materials for thermal energy storage: A review. Renewable and Sustainable Energy Reviews 81:1771-86. 3. Reed S, Sugo H, Kisi E (2018) High temperature thermal storage materials with high energy density and conductivity. Solar Energy 163:307-14. 4. Achchaq F, Palomo del Barrio E (2017) A proposition of peritectic structures as candidates for thermal energy storage. Energy Procedia 139:346-51.

Biography

Fouzia Achchaq is Associated Professor at the University of Bordeaux and Researcher at TREFLE Department (Fluids & Transfers) of the I2M Institute and a member of TESLab (Thermal Energy Storage Laboratory), I2M/Abengoa Joint Research Unit. She has expertise in thermal energy storage materials used at high temperatures and contributes to an ANR Project Pc2TES (National Project, 2017-2020).

E-mail: fouzia.achchaq@u-bordeaux.fr