NOVELTY - A high ratio power lithium ion battery is formed by stacking or rolling and packaging a positive electrode, a gel polymer electrolyte film, a polyethylene porous film, a gel polymer electrolyte film and a negative electrode, where the positive electrode and the negative electrode comprise active materials, respectively. The positive electrode active material is lithium-nickel compound or modified lithium-nickel compound. The negative electrode active material is lithium-nickel-manganese compound or lithium-nickel-manganese-metal compound.    USE - High ratio power lithium ion battery.    ADVANTAGE - The specific power of the lithium ion battery can be effectively increased. The lithium ion battery has high safety performance, better storage performance and prolonged service life. The lithium ion battery can be manufactured in a simple manner with low requirements on environment.    DETAILED DESCRIPTION - A high ratio power lithium ion battery is formed by stacking or rolling and packaging a positive electrode, a gel polymer electrolyte film, a polyethylene porous film, a gel polymer electrolyte film and a negative electrode, where the positive electrode and the negative electrode comprise active materials, respectively. The positive electrode active material is lithium-nickel compound (LiNi0.5Mn1.5O4) or modified lithium-nickel compound (LixNi0.5-yMn1.5-zMy+zO4-w), where y and z is greater than 0, x is in range of 0.9-1.1, sum of y and z is in range of 0-0.1, and w is in range of 0-2. The negative electrode active material is lithium-nickel-manganese compound (LiNi0.5Mn1.5O4) or lithium-nickel-manganese-metal compound (LixNi0.5-yMn1.5-zMy+zO4-w), where w is chosen from carbon, zinc oxide, silicon oxide or aluminum oxide. The M is chosen from aluminum, magnesium, titanium, chromium, zirconium, copper, Molybdenum, iron, cobalt, vanadium, fluorine, tin base composite material, natural graphite, artificial graphite, carbon fiber or middle phase carbon micro balloon. An INDEPENDENT CLAIM is also included for a method for preparing a high ratio power lithium ion battery.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram illustrating a method for preparing a high ratio power lithium ion battery.'(Drawing includes non-English language text)'