TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The contents of the thermal activation materials in the first electrode material layers are different from each other, and increase with decreasing of distance between the first electrode material layers and the second plate. The content of the thermal activation material in each of the first electrode material layers is 0.1-10 wt.%, preferably 1-2.5 wt.%. The thermal activation material includes a nitrogen-containing polymer, which is formed by a reaction between bismaleimide monomers and barbituric acid. The nitrogen-containing polymer is formed by a reaction between diones and a group including amines, amides, imides, maleimides or imines. The diones include barbituric acid, acetylacetone or their derivatives. The lithium battery includes a conductive material of each of the first electrode material layers comprising lithium cobalt dioxide, lithium manganese oxide, lithium nickel manganese cobalt oxide of formula (LiNixCOyMnzO2), lithium nickel cobalt aluminum oxide of formula (LiNixCoyAlzO2) or lithium iron phosphate, when the first plate is an positive electrode plate. The composition of the conductive materials of the first electrode material layers are different from each other, when the contents of the thermal activation materials in the first electrode material layers are the same as each other. The first plate comprises a top electrode material layer close to the second plate, and a bottom electrode material layer away from the second plate, which includes a ratio of a thickness of the top electrode material layer to a thickness of the bottom electrode material layer is 10:90-90:10. The second plate is a negative electrode, when the first plate is a positive electrode, and vice versa. The second electrode plate is formed by number of second electrode material layers stacked on one another, and at least one of the second electrode material layers including a thermal activation material.x-z = 0-1.