SOLID SOLUTION LITHIUM-CONTAINING TRANSITION METAL OXIDE AND LITHIUM ION SECONDARY BATTERY

• Main Authors: OSAWA, YASUHIKO, YAMAMOTO, SHINJI, ITO, ATSUSHI, KABURAGI, TOMOHIRO
• Format: Patent
• Language: English; French; Japanese
• Published: 08.08.2013
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OFSOLID INORGANIC COMPOUNDS; INORGANIC CHEMISTRY; METALLURGY; 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

A solid solution lithium-containing transition metal oxide, including a compound indicated by chemical formula (1). Chemical formula 1: Li1.5[NiaCobMnc[Li]d]O3.(In formula, a, b, c, and d fulfill the relationships 0<a@0.75, 0@b@0.5, 0<c@1.0, 0.05@d@0.25, and a+b+c+d=1.5.) A dQ/dV curve, obtained by differentiating a discharge side open circuit voltage curve obtained by charging/discharging a lithium ion secondary battery using said compound as the positive electrode active material therefor, fulfills numerical formula (1). Numerical formula 1: A/B@1.0 (in formula, A indicates the dQ/dV value in a peak (A) positioned between 3.0-3.5 V in the dQ/dV curve. B indicates the dQ/dV value in a peak (B) positioned between 3.5-4.0 V in the dQ/dV curve. L'invention concerne un oxyde de métal de transition contenant du lithium en solution solide, comprenant un composé indiqué par la formule chimique (1). Formule chimique 1: Li1,5[NiaCobMnc[Li]d]O3.(Dans la formule, a, b, c, et d satisfont les relations 0 < a @ 0,75, 0 @ b @ 0,5, 0 < c @ 1,0, 0,05 @ d @ 0,25 et a + b + c + d = 1,5). Une courbe de dQ/dV, obtenue en dérivant une courbe de tension en circuit ouvert côté décharge obtenue en chargeant / déchargeant une batterie rechargeable lithium-ion en utilisant ledit composé comme matériau actif d'électrode positive pour celle-ci, satisfait la formule numérique (1). Formule numérique 1 : A/B @ 1,0 (dans la formule, A indique la valeur de dQ/dV sur un pic (A) positionné entre 3,0 et 3,5 V sur la courbe de dQ/dV. B indique la valeur de dQ/dV sur un pic (B) positionné entre 3,5 et 4,0 V sur la courbe de dQ/dV).