Lithium ion battery and preparation method thereof

• Main Authors: XING SHINA, LOU CHENYANG
• Format: Patent
• Language: Chinese; English
• Published: 14.01.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention relates to a lithium ion battery and a preparation method thereof. The lithium ion battery comprises a positive electrode, a negative electrode and a diaphragm, wherein the positive electrode adopts a ternary material with D50 of 5 [mu] m-7 [mu] m as a positive electrode active material, and a microporous aluminum foil is adopted as a positive electrode current collector. The positive electrode of the lithium ion battery adopts the specific composition and structure, so that the cycle performance of the lithium ion battery can be obviously improved, meanwhile, the temperature rise of high-rate discharge of the high-capacity lithium ion battery is reduced, and the service life of the lithium ion battery is prolonged. 本发明涉及一种锂离子电池及其制备方法，所述锂离子电池包括正极、负极和隔膜，所述正极采用的正极活性物质为D50为5μm-7μm的三元材料，并采用微孔铝箔作为正极集流体；本发明所述锂离子电池的正极采用上述特定组成和结构，其能明显改善锂离子电池的循环性能，同时降低高容量锂离子电池大倍率放电的温升，延长锂离子电池的使用寿命。