SECONDARY BATTERY AND PREPARATION METHOD THEREFOR

• Main Authors: SHENG, Maohua, JI, Bifa, TANG, Yongbing, ZHANG, Fan
• Format: Patent
• Language: English; French; German
• Published: 28.06.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The present invention relates to the field of batteries, and more specifically to a secondary battery and a method for preparing the same. The secondary battery comprises a battery negative electrode, an electrolyte liquid, a diaphragm and a battery positive electrode, the battery negative electrode comprises a negative electrode current collector, and the negative electrode current collector also acts as a negative electrode active material; the electrolyte liquid comprises an electrolyte and a solvent, the electrolyte is a lithium salt; the battery positive electrode comprises a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer comprises a positive electrode active material capable of reversibly de-intercalating lithium ions. In the present invention, since a metal or metal alloy or metal composite is simultaneously used as the negative electrode current collector and the negative electrode active material, thus no additional negative electrode active material needs to be added, thereby effectively reducing the weight and volume of the battery; and in the meantime, the capacity of the battery is effectively increased. Further, the energy density of the battery is remarkably improved, the production cost is reduced, the production process is simplified, and the secondary battery of the present invention has a good charging and discharging cycle performance.