Lithium precipitation, thickening of the electrode surface passivation film, loss of reversible lithium, and degradation of the active material structure can all lead to a decline in the lifespan of lithium-ion batteries. Among them, the negative electrode is the primary factor causing capacity decay in the battery. This article summarizes the main principles of negative…

Description of the problem The coating of lithium-ion battery electrodes mainly consists of two parts: coating and baking. The coating process determines key parameters such as coating width and coating amount, while the baking process has a significant impact on the electrode’s microstructure. Furthermore, the microstructure of the electrode greatly affects the battery’s wettability, adhesion, and…

1.The reason for the appearance of black on the surface of disassembled lithium battery electrodes The possible reasons for the black appearance on the surface of lithium battery electrodes during disassembly are as follows: 1.1 Formation of SEI film: On the negative electrode surface of a lithium-ion battery, a thin film called SEI is formed. This…

What is battery thermal management? Batteries have similar characteristics to humans in that they cannot tolerate extreme heat or cold, and their optimum operating temperature is typically between 15-40°C. However, the working environment of a car can vary widely, with temperatures ranging from -20°C to 55°C being common. So, what can be done in such…

1.lithium precipitation and SEI film in lithium batteries This article provides a comprehensive analysis of the capacity degradation mechanism in lithium-ion batteries. It categorizes and organizes the factors that influence the aging and lifespan of lithium-ion batteries. It elaborates in detail on various mechanisms such as overcharging, SEI film growth and electrolyte, self-discharge, active material loss,…

Viscosity is the degree of resistance to flow within a fluid, and its definition formula is: viscosity η = shear force τ / shear rate γ. The shear force τ is the force per unit area experienced by a fluid along a tangent in shear flow, as shown in the figure. Its definition formula is: Where F…

Over the past decade, the lithium-ion battery industry has transitioned from semi-automatic to standalone automation, and then gradually towards full automation and intelligence. Throughout this process, there have been minimal major changes in battery manufacturing processes. However, with the continuous and rapid growth of battery demand, exceeding 100% annually, and the ongoing upgrades in battery…

In the new energy industry, the production process of lithium batteries involves several key steps, including mixing and slurring, coating, winding, cutting and shaping, stacking or winding, assembly, electrolyte injection, sealing and welding, and packaging. During the processes of mixing and slurring, cutting and shaping, winding or stacking, as well as sealing and welding, a…

The electrode sheets of lithium-ion batteries are made by coating electrode slurry onto metal foils. The electrode slurry consists of the following materials dispersed in organic solvents: Active material: Lithium-ion intercalation/deintercalation host.Conductive additives: Facilitate electronic conduction.Binder: Used to bond the active material and conductive additives. For high-capacity batteries, it is necessary to reduce the proportion…

The battery jelly roll is a type of Archimedean spiral. According to the relevant theory, the relationship between the radius r of the jelly roll and the total rotation angle ϕ can be calculated using the following equation： When the radius of the jelly roll needle in the battery is r0, Among them, ϕ is the total angle…

Commonly used technologies for humidity control in lithium battery drying rooms include the following: Dehumidifier: A dehumidifier is a common humidity control device that lowers indoor humidity by removing moisture from the air. It can automatically adjust its operation based on the set humidity level and maintain the humidity within an appropriate range. Desiccant: A…

During the manufacturing process of lithium-ion batteries, there are three crucial factors that must be strictly controlled: dust, metallic particles, and moisture. Poor control of dust and metallic particles can directly lead to internal short circuits and fire accidents in the battery. Similarly, inadequate control of moisture can also cause significant harm to battery performance…