양극 활물질, 리튬 이온 이차 전지, 및 차량

• Main Authors: RYO ARASAWA, SHIORI SAGA, SHUNICHI ITO, YOHEI MOMMA, YUJI IWAKI, JO SAITO, KUNIHIKO SUZUKI, SHUNPEI YAMAZAKI, KANTA ABE, TEPPEI OGUNI
• Format: Patent
• Language: Korean
• Published: 13.07.2023
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

열화의 요인이 되는 결함이 적거나 진행이 억제된 양극 활물질을 제공한다. 이차 전지에 사용되는 양극 활물질이고, 양극 활물질은 첨가 원소를 포함하는 코발트산 리튬을 가지고, 양극 활물질을 양극에 사용하고, 상대 전극으로서 리튬 전극을 사용한 셀에 대하여 사이클 시험을 수행한 후, 양극 활물질은 결함을 가지고, 결함의 근방 영역에 적어도 첨가 원소와 같은 원소를 가지는 양극 활물질이다. 첨가 원소는 양극 활물질의 표층부에도 포함된다. A positive electrode active material in which the number of defects that cause deterioration is small or progress of the defect is suppressed is provided. The positive electrode active material is used for a secondary battery. The positive electrode active material contains lithium cobalt oxide containing an additive element. After a cycle test is performed on a cell that uses the positive electrode active material for a positive electrode and a lithium electrode as a counter electrode, the positive electrode active material includes a defect and contains at least the same element as the additive element in a region in the vicinity of the defect. The additive element is contained also in a surface portion of the positive electrode active material.