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Synthesis of Li4SiO4

https://doi.org/10.3390/ijms20040928

“Li4SiO4 material is usually synthesized by the solid-state reaction method, and the preparation process is illustrated by Equation (1) [22,23], and a core-shell model was suggested for the solid-state reaction between Li2CO3 and SiO2, which is shown in Figure 2. In the first step, Li2CO3 reacts with SiO2 at their contact part, and a thin Li2SiO3 layer is formed. Li2SiO3 is the intermediate product, which continues to react with Li2CO3 to form Li4SiO4 eventually. Li4SiO4 and Li2SiO3 layers become thicker with the reaction, and internal SiO2 is covered by the layers in the meantime. Thus, Li+ and O2− must diffuse through the product layer before contacting with internal SiO2, and it is the limited step that limiting the synthesis of Li4SiO4, because the diffusion process is much slower than the reaction. Consequently, alternative synthesis methods and precursors for the synthesis of Li4SiO4 have been reported, which will be discussed in the following section [24].”

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Figure 2. Core-shell model for synthesis of Li4SiO4 by the solid-state route [24].”

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