NOVELTY - Long-life high-power lithium ion battery comprises a positive pole, a negative pole, a diaphragm (4) and electrolyte (3).    USE - The long-life high-power lithium ion battery is used in electrochemical energy storage technology innovation.    ADVANTAGE - The better volume of the lithium ion battery can be kept under the great current charging and discharging; the circulating stability is better; and the service life is longer.    DETAILED DESCRIPTION - Long-life high-power lithium ion battery comprises a positive pole, a negative pole, a diaphragm (4) and electrolyte (3), where the positive pole is a positive electrode piece (1) formed by frontally and reversely coating a coating material on an aluminum foil; the coating material is composed of spinel type lithium manganate, conducting agent and adhesive; the negative pole is a negative electrode piece (2) formed by frontally and reversely coating a coating material on an aluminum foil; the coating material is composed of lithium titanate, conducting agent and adhesive; and the positive electrode piece (1) and the negative electrode piece (2) are suspended in the electrolyte (3). An INDEPENDENT CLAIM is a preparation method of long-life high-power lithium ion battery comprising a positive pole preparation process and a negative pole preparation process, where the positive pole preparation process is as follows: 80-90% of lithium manganate by mass, 5-15% of conducting agent by mass and 5-10% of adhesive by mass are dissolved in the water solution or N-methylpyrrolidone, and are stirred in a ball milling manner to form the positive pole slurry; the slurry is evenly coated on the frontal and reverse surfaces of the aluminum foil, and is dried, then is rolled and cut to form the positive electrode piece (1); the negative pole preparation process is as follows: 75-90% of lithium titanate by mass, 5-20% of conducting agent by mass and 5-10% of adhesive by mass are dissolved in the water solution or N-methylpyrrolidone, and are stirred in a ball milling manner to form the negative pole slurry; the slurry is evenly coated on the frontal and reverse surfaces of the aluminum foil, and is dried, then is rolled and cut to form the negative electrode piece (2).