Li 4 SiO 4 -Based Heat Carrier Derived from Different Silica Sources for Thermochemical Energy Storage

Xicheng Wang, Wentao Xia, Wenlong Xu, Zengqiao Chen (), Xiaohan Ren () and Yuandong Yang ()
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Xicheng Wang: Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China
Wentao Xia: Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China
Wenlong Xu: Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China
Zengqiao Chen: Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China
Xiaohan Ren: Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China
Yuandong Yang: Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China

Energies, 2024, vol. 17, issue 9, 1-13

Abstract: Thermochemical energy storage (TCES) is one of the key technologies facilitating the integration of renewable energy sources and mitigating the climate crisis. Recently, Li 4 SiO 4 has been reported to be a promising heat carrier material for TCES applications, owing to its moderate operation temperature and stability. During the synthetic processes, the properties of the Si source used directly influence the performance of derived Li 4 SiO 4 materials; however, the internal relations and effects are not yet clear. Hence, in this work, six kinds of SiO 2 sources with different phases, morphology, particle size, and surface area were selected to synthesize a Li 4 SiO 4 -based TCES heat carrier. The physicochemical properties of the SiO 2 and the corresponding derived Li 4 SiO 4 were characterized, and the comprehensive performance (e.g., heat storage/releasing capacity, rate, and cyclic stability) of the Li 4 SiO 4 samples was systematically tested. It was found that the silica microspheres (SPs), which possess an amorphous phase, uniform micro-scale structure, and small particle size, could generate Li 4 SiO 4 TCES materials with a highest initial capacity of 777.7 kJ/kg at 720 °C/900 °C under pure CO 2 . As a result, the SP-L showed an excellent cumulative heat storage amount of 5.84 MJ/kg within 10 heat-releasing/storage cycles, which was nearly 1.5 times greater than the value of Li 4 SiO 4 derived from commonly used silicon dioxide. Furthermore, the effects of the utilized Si source on the performance of as-prepared Li 4 SiO 4 and corresponding mechanisms were discussed, which offers guidance for the future selection of Si sources to produce high-performance Li 4 SiO 4 -based TCES heat carriers.

Keywords: Li 4 SiO 4; silicon source; CO 2 capture; thermochemical energy storage (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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