There are no lithium atoms present in either the reactants or the products of this reaction.
As you stated, the reaction of vinegar (acetic acid) and baking soda (sodium hydrogen carbonate) produces sodium acetate, water and carbon dioxide according to the equation:
[C_2H_4O_2 + NaHCO_3 -> NaC_2H_3O_2 + CO_2 + H_2O]