COMPOSITE NEGATIVE ELECTRODE ACTIVE MATERIAL, METHOD FOR PREPARING SAME, NEGATIVE ELECTRODE COMPRISING SAME, AND SECONDARY BATTERY

• Main Authors: OH, Ilgeun, KIM, Kwanghyun, LEE, Yong Ju, CHAE, Byung Joon, PARK, Semi, SHIN, Sun Young
• Format: Patent
• Language: English; French; Korean
• Published: 12.01.2023
• Subjects: BASIC ELECTRIC ELEMENTS; CASTING; ELECTRICITY; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; PERFORMING OPERATIONS; POWDER METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; TRANSPORTING; WORKING METALLIC POWDER

The present invention relates to a composite negative electrode active material comprising: silicon-based oxide particles; and a metal distributed on the surface, inside, or on the surface and inside of the silicon-based oxide particles, wherein the average diameter of aggregates, as obtained by a specific method, is 65 nm or less. The composite negative electrode active material has a uniform and small aggregate diameter, and thus deterioration in the lifespan performance of the composite negative electrode active material, which is affected by the volumetric expansion and contraction of silicon during charging and discharging, can be minimized. La présente invention concerne un matériau actif d'électrode négative composite comprenant : des particules d'oxyde à base de silicium ; et un métal réparti sur la surface, à l'intérieur, ou sur la surface et à l'intérieur des particules d'oxyde à base de silicium, le diamètre moyen des agrégats, tels qu'obtenus par un procédé spécifique, étant inférieur ou égal à 65 nm. Le matériau actif d'électrode négative composite a un diamètre d'agrégat uniforme et petit, et par conséquent une détérioration des performances de durée de vie du matériau actif d'électrode négative composite, qui sont affectées par l'expansion et la contraction volumétriques du silicium pendant la charge et la décharge, peut être réduite au minimum. 본 발명은 실리콘계 산화물 입자; 및 상기 실리콘계 산화물 입자의 표면, 내부, 또는 표면 및 내부에 분포된 금속;을 포함하는 복합 음극 활물질로서, 특정 방법에 의해 얻어지는 집합체 직경의 평균 값이 65nm 이하인 복합 음극 활물질에 관한 것이다. 상기 복합 음극 활물질은 균일하고 작은 집합체 직경을 가짐으로써, 충방전 시 실리콘의 부피 팽창 및 수축이 미치는 복합 음극 활물질의 수명 성능 저하를 최소화할 수 있다.