NONAQUEOUS ELECTROLYTE SOLUTION TYPE LITHIUM ION SECONDARY BATTERY

• Main Authors: YUASA, SACHIE, OKUDA, CHIKAAKI, MIZUTANI, MAMORU, HIRUTA, OSAMU, TSUJIKO, AKIRA, IMAMINE, TAKAHITO, ITOU, YUICHI, TAKEUCHI, YOUJI, SAWADA, HIROSHI, HARA, TOMITARO, SASAKI, TSUYOSHI
• Format: Patent
• Language: English; French; Japanese
• Published: 21.04.2011
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; COMPOUNDS THEREOF; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

Disclosed is a lithium ion secondary battery which uses a two-phase compound as a positive electrode active material and has excellent durability. The lithium ion secondary battery comprises: an electrode body that has a positive electrode containing a positive electrode active material and a negative electrode containing a negative electrode active material; and a nonaqueous electrolyte solution that contains a lithium salt in an organic solvent. The positive electrode active material is mainly composed of a lithium-containing two-phase compound and additionally contains particles that are formed from a lithium transition metal oxide having a lamellar structure. The particles of the lamellar oxide have an average particle diameter of 2 µm or less and are contained in the positive electrode active material in an amount of 5% by mass or less. L'invention concerne une batterie secondaire au lithium-ion qui utilise un composé biphasique comme matériau actif d'électrode positive et qui a une excellente durabilité. La batterie secondaire au lithium-ion comprend : un corps électrode qui a une électrode positive contenant un matériau actif d'électrode positive et une électrode négative contenant un matériau actif d'électrode négative ; et une solution électrolyte non aqueuse qui contient un sel de lithium dans un solvant organique. Le matériau actif d'électrode positive est principalement composé d'un composé biphasique contenant du lithium et contient en outre des particules qui sont formées à partir d'un oxyde de métal de transition lithié ayant une structure lamellaire. Les particules de l'oxyde lamellaire ont un diamètre de particule moyen de 2 µm ou moins et sont contenues dans le matériau actif d'électrode positive dans une quantité de 5 % en masse ou moins.