▎ 摘　　要

NOVELTY - Fireproof expansion film is claimed. The fireproof expansion film is composed of graphene oxide. USE - The film is useful in fire and explosion prevention of battery, preferably built-in battery of electronic device (claimed). ADVANTAGE - The film: can be thermally expanded when exposed to a certain temperature outside; produce large amount of non-toxic and harmless non-combustible gas; and has early warning effect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing fireproof expansion film comprising coating the graphene oxide dispersion on the base film, drying, and then removing the base film to obtain final product.