The formula for lithium oxide is Li2O.
Lithium oxide is an inorganic compound composed of lithium and oxygen. Lithium, which is an alkali metal, has a +1 charge, while oxygen, a non-metal, has a -2 charge. To balance the charges, two lithium ions (each with a +1 charge) combine with one oxygen ion (with a -2 charge). This results in the chemical formula Li2O.
In this compound, lithium donates one electron to oxygen, forming an ionic bond. This bond is what holds the lithium and oxygen atoms together in the compound.