POSITIVE ELECTRODE FOR LITHIUM SECONDARY BATTERY, AND LITHIUM SECONDARY BATTERY

• Main Authors: LEE KYUNG MIN, LEE SU RIM, JEON SUNG WOOK, LEE HAE YEON
• Format: Patent
• Language: English; Japanese
• Published: 26.07.2024
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide a positive electrode for a lithium secondary battery, and a lithium secondary battery comprising the same.SOLUTION: The positive electrode for a lithium secondary battery sequentially includes, on a positive electrode current collector, a first mixture layer and a second mixture layer, and employs heterogeneous fluorine-based binders different in miscibility and molecular weight for the first mixture layer and the second mixture layer. Accordingly, the positive electrode not only can secure the safety of the battery by increasing the penetration resistance in the case where a metal body such as a nail penetrates the electrode from an outside, but also advantageously realizes excellent lifespan characteristics of the battery by being capable of enhancing the interface adhesive force of each layer constituting the positive electrode and wettability of the mixture layer to an electrolyte solution.SELECTED DRAWING: None 【課題】本発明は、リチウム二次電池用の正極およびそれを含むリチウム二次電池に関する。【解決手段】前記リチウム二次電池用の正極は、正極集電体上に第１合材層および第２合材層を順次に含み、かつ第１合材層と第２合材層に混和性および分子量が異なる異種のフッ素系バインダーを用いることで、外部から釘のような金属体が電極を貫通する場合に貫通抵抗を増加させて電池の安全性を確保し得るのみならず、正極を構成する各層の界面接着力と合材層の電解液に対する濡れ性を高めることができるので、電池の寿命特性に優れるという利点がある。【選択図】なし