NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

• Main Author: AMANO JUNKO
• Format: Patent
• Language: English; Japanese
• Published: 18.04.2024
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide a nonaqueous electrolyte secondary battery in which reduction of the capacity maintenance ratio is prevented.SOLUTION: A nonaqueous electrolyte secondary battery disclosed herein includes a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and a nonaqueous electrolyte. The negative electrode has a negative electrode current collector including a principal plane on which lithium metal is deposited during charging. The ratio of an average spacing (L) of recesses (L/Ra) on the principal plane to an arithmetic mean roughness (Ra) of the principal plane is between 7.6 and 40.0.SELECTED DRAWING: None 【課題】容量維持率の低下が抑制された非水電解質二次電池を提供する。【解決手段】本開示の非水電解質二次電池は、正極と、負極と、前記正極及び前記負極の間に配置されたセパレータと、非水電解質と、を備える。前記負極は、充電時にリチウム金属が析出する主面を含む負極集電体を有する。前記主面の算術平均粗さ（Ｒａ）に対する前記主面の凹部の平均間隔（Ｌ）の比（Ｌ／Ｒａ）は、７．６～４０．０である。【選択図】なし