▎ 摘　　要

NOVELTY - High-capacity lithium battery, comprises anode, cathode, separator i.e. modified cyanate ester film and electrolyte. USE - The high-capacity lithium battery is useful in the technical field of lithium-batteries. ADVANTAGE - The high-capacity lithium battery reduces rigid tensile strength and liquid retention after copolymerization of cyanate resin, improves the cyclability of lithium batteries and prolong service life of lithium battery; utilizes self-made additive is silicon-containing cyclophosphazene with double-terminal amino group improving heat resistance of electrolyte, reduces capacitance loss and ensures the cycle of lithium batteries. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing high-capacity lithium battery, comprising preparing anode, diaphragm, electrolyte, and preparing high-capacity lithium battery.