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  Winding Process 1. Principle and Process Principle: The winding process involves the use of a fixed winding needle to wind and compress the pre-processed anode sheets, separator, and cathode sheets in sequence to form a cylindrical or elliptical shape. Process: The raw materials are stacked in the sequence of anode, separator, cathode, separator. Then, they are wound into cylindrical or elliptical shapes and placed into metal casings, either square or cylindrical. Specific steps include the unwinding of the anode and cathode sheets and separators, automatic alignment, automatic tension detection and control. The anode and cathode sheets are fed into the winding section by a clamp feeding mechanism, which, together with the separator , undergoes automatic winding according to specified process requirements. After the winding is completed, the machine automatically switches workstations, cuts the separator, attaches the end seal tape, and the finished bare cell is automatically dis...

The formation process is an indispensable step in the manufacturing of lithium-ion batteries, as it directly affects the battery’s performance, safety, and lifespan. One of the key roles during the formation process is the formation of a stable solid electrolyte interphase (SEI) film on the surface of the anode. The SEI film protects the anode material from further erosion by the electrolyte, preventing the dissolution of the anode material in the electrolyte and thus extending the battery’s lifespan. At the same time, a stable SEI film can prevent the continuous decomposition of the electrolyte during subsequent charging and discharging cycles, reducing internal side reactions and thereby minimizing performance degradation. The formation process of lithium batteries is divided into four steps: open-circuit charging, closed-circuit charging, closed-circuit aging, and closed-circuit discharging. 1.Open-Circuit Charging (Pre-charging or Gas Venting) This step primarily involves charging ...

Lithium metal batteries have attracted significant attention due to their high energy density. However, their development has been hindered by issues such as uncontrollable dendrite growth of lithium metal anodes, unstable solid electrolyte interphase (SEI), and poor cycling stability. Solid-state electrolytes (SSEs) are attractive due to their inherent safety, with polymer solid-state electrolytes (SPEs) receiving particular attention for their processability, cost-effectiveness, and good contact with electrodes. However, traditional SPEs (such as poly(ethylene oxide) (PEO)-based electrolytes) have low ionic conductivity (typically <10⁻⁵ S cm⁻¹ at room temperature), limiting their application at room temperature. Recently, Kang Feiyu, Lu Wei, Liu Ming, and He Yanbing’s team from Tsinghua University’s Shenzhen International Graduate School proposed a 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE) diluent to significantly modulate dipole-dipole interactions in polymer...

Comprehensive Solution for Negative Electrode Binders for Lithium Batteries                                                                                                                                                                                             Overview of Lithium-ion Battery Binders In the production of lithium-ion batteries, binders  are often referred to as "auxiliary materials" together with conductive agents, additives, etc., but they are an indispensable key material. Their main function is ...