5. Self-discharge phenomena

Self-discharge phenomena in thermal batteries have various origins:

• partial solubility of lithium or lithium-based compounds in the electrolyte (table 8 );

• thermal decomposition of pyrite in contact with molten electrolyte ;

• partial solubility of sulfur species (Li ₂ S, FeS, FeS ₂ ) (figure 11 );

• formation of a parasitic phase between pyrite and electrolyte (phase J).

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