Silica based materials are important candidates as anodes for lithium ion batteries due to their high specific capacity, low production and material cost and abundance in the earth crust. Silica lithiation leads to reversible and irreversible reactions to produce silicon, lithium oxide and lithium silicates. The final composition of these products confers a variety of electrochemical performances, particularly concerning their specific capacity and stability/cyclability of the electrodes. Knowledge on the thermochemistry of these reactions is relevant to analyze the thermodynamic stability and potential occurrence of the different phases. In this work, the free energy of reaction for the lithiation of silica is calculated for different products. The

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