The present application provides a precursor solution, a modified film comprising the same, and a
lithium battery. The modified film is formed on the two poles or the separator film of the battery by a photo-
polymerization reaction or
thermal curing of the precursor solution. The
lithium battery with the modified film can effectively improve the charge-
discharge capacity, cycle life and safety. The modified film can be applied to a roll-to-roll process. In the charge-
discharge cycle process, the formation of
lithium dendrites can be effectively inhibited or reduced, and the modified film has good cycle life and safety. In the state of lithium-
sulfur batteries and lithium-
iodine batteries, the shuttle effect can be inhibited or reduced. The above characteristics are beneficial to improve the
product value of lithium-
ion batteries,
lithium metal batteries,
anode-free lithium batteries, lithium-
sulfur batteries and lithium-
iodine batteries.