what do the electrode potentials mean??? Watch
Bit of a simplification, but its a good start.
It's electrode potential is -3.04V. Remember that electrode potentials are, in truth, standard REDUCTION potentials - they are the potential energy of REDUCTION so it's half equation is written as a Lithium cation gaining an electron. The negative value suggests it isn't a favourable process, so the opposite way around is very favourable - it's far more favourable for elemental Lithium to lose it's electron (E = +3.04 V).