MULTILAYER GRAPHITE, MANUFACTURING METHOD THEREOF AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a graphite having excellent discharge property and excellent cycle property in heavy current in the case of being used as a negative electrode active material for a non-aqueous electrolyte secondary battery such as a lithium secondary battery and a non-aqueous electrolyte secondary battery having the properties by using the same. SOLUTION: A boron-containing graphite coated layer based on a mesophase pitch and a boron compound is formed on the surface of graphite to be a base material by applying the mesopitch having the boron compound on the surface of the graphite to be the base material and firing at a high temperature to produce the multiple-layered graphite and the non-aqueous electrolyte secondary battery is formed by using the multilayer graphite as the negative electrode active material. The thickness of the boron-containing graphite coated layer is preferably 10-500 nm.