POSITIVE ELECTRODE FOR LITHIUM-SULFUR SECONDARY BATTERY HAVING PATTERN, MANUFACTURING METHOD THEREFOR, AND LITHIUM-SULFUR SECONDARY BATTERY INCLUDING SAME

• Main Authors: PARK, Gi Su, LEE, Seong Ho, KIM, Bong Soo
• Format: Patent
• Language: English; French; Korean
• Published: 01.04.2021
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

Provided are a positive electrode which is for a lithium-sulfur secondary battery and includes a positive electrode active material layer having an engraved pattern formed therein, a manufacturing method therefor, and a lithium-sulfur secondary battery including same. The positive electrode active material layer has a porosity of 50 to 65%. The engraved pattern has a width of 1 to 100 μm and has a depth equivalent to 30 to 99% of the thickness of the positive electrode active material layer. The volume ratio between the positive electrode active material layer and the engraved pattern is 4:1 to 40:1. Applying the positive electrode to a lithium-sulfur secondary battery can significantly improve the energy density per unit volume. L'invention concerne une électrode positive destinée à une batterie secondaire au lithium-soufre et comprenant une couche de matériau actif d'électrode positive comportant un motif gravé formé à son intérieur, un procédé de fabrication associé, et une batterie secondaire au lithium-soufre comprenant ladite électrode positive. La couche de matériau actif d'électrode positive présente une porosité comprise entre 50 et 65 %. Le motif gravé présente une largeur comprise entre 1 et 100 µm et une profondeur équivalente à 30 à 99 % de l'épaisseur de la couche de matériau actif d'électrode positive. Le rapport de volume entre la couche de matériau actif d'électrode positive et le motif gravé est compris entre 4:1 et 40:1. L'application de l'électrode positive à une batterie secondaire au lithium-soufre peut améliorer considérablement la densité d'énergie par unité de volume. 음각 패턴이 형성된 양극 활물질층을 포함하는 리튬-황 이차전지용 양극, 이의 제조방법 및 이를 포함하는 리튬-황 이차전지가 제공된다. 상기 양극 활물질층은 50 내지 65%의 기공도를 가진다. 상기 음각 패턴은 1 내지 100㎛의 폭을 가지고, 양극 활물질층의 두께를 기준으로 30 내지 99%의 깊이를 가진다. 상기 양극 활물질층과 음각 패턴의 부피비는 4:1 내지 40:1이다. 상기 양극은 리튬-황 이차전지에 적용 시 단위 부피당 에너지 밀도를 현저하게 개선할 수 있다.