LITHIUM SECONDARY BATTERY

• Main Authors: KIM, Ki Woong, JUNG, Do Hwa, SONG, Jung Whan, NOH, Tae Gyun, LEE, Yoon Jae, LEE, Woo Sirl
• Format: Patent
• Language: English; French; Korean
• Published: 30.07.2020
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The present invention provides a lithium secondary battery comprising: a positive electrode comprising aluminum-doped bimodal lithium cobalt oxide which comprises a first lithium cobalt oxide and a second lithium cobalt oxide having different average particle sizes (D50) from each other; a negative electrode comprising a bimodal graphite which comprises a first graphite and a second graphite having different average particle sizes (D50) from each other; and a first additive which is a nitrile-based compound, wherein the first lithium cobalt oxide and the second lithium cobalt oxide each independently comprise aluminum with a concentration of 2500 to 4000 ppm. La présente invention concerne un accumulateur au lithium comprenant: une électrode positive comprenant de l'oxyde de lithium-cobalt bimodal dopé à l'aluminium qui comprend un premier oxyde de lithium-cobalt et un second oxyde de lithium-cobalt ayant des tailles de particules moyennes (D50) différentes entre elles; une électrode négative comprenant un graphite bimodal qui comprend un premier graphite et un second graphite ayant des tailles de particules moyennes (D50) différentes entre elles; et un premier additif qui est un composé à base de nitrile, le premier oxyde de cobalt-lithium et le second oxyde de cobalt-lithium comprenant chacun indépendamment de l'aluminium ayant une concentration comprise entre 2 500 et 4 000 ppm. 본 발명은 평균 입경(D50)이 서로 다른 제1리튬 코발트 산화물 및 제2리튬 코발트 산화물을 포함하고, 알루미늄이 도핑된 바이모달 리튬 코발트 산화물을 포함하는 양극; 평균 입경(D50)이 서로 다른 제1흑연 및 제2흑연을 포함하는 바이모달 흑연을 포함하는 음극; 및 니트릴계 화합물인 제1첨가제를 포함하고, 상기 제1리튬 코발트 산화물 및 제2리튬 코발트 산화물은 각각 독립적으로 알루미늄을 2500 ppm 내지 4000 ppm의 농도로 포함하는 것인 리튬 이차 전지를 제공한다.