Core Viewpoint - The article emphasizes the critical role of binders in lithium-ion batteries, highlighting their importance despite being considered auxiliary materials. Binders ensure the structural integrity, cycle life, and safety performance of batteries, influencing key factors such as SEI film formation and charge transfer [3][26]. Part 01: Introduction - Binders, although occupying a small mass fraction in electrodes, are essential materials that adhere active substances and conductive agents to the current collector, maintaining electrical contact and structural integrity [3]. Part 02: Basic Properties of Binders - The bonding strength of binders arises from intermolecular forces, chemical bonds, and electrostatic attraction. Three theories explain the bonding mechanism: diffusion theory, electrostatic theory, and adsorption theory [4]. Part 03: Failure Mechanisms - Binder failure can disrupt ion/electron transport, leading to active material loss and battery capacity degradation. The main failure mechanisms include interface damage, binder rupture due to stress, and adhesive material fracture [7]. Evaluation Methods for Binders - Various methods are used to evaluate binders, including: - Bond strength testing through peel tests and electron microscopy [8]. - Mechanical strength testing via tensile, shear, and fatigue tests [9]. - Scratch testing to assess adhesion strength and mechanical properties [9]. - Dispersion testing to analyze the impact of binders on slurry uniformity [10]. - Glass transition temperature (Tg) assessment to determine the binder's adhesive capability [10]. - Thermal stability testing using TGA and DSC to evaluate thermal safety [11]. Equipment Development - ChuanYuan Technology has developed high-precision sampling equipment (UP series) to address the challenges in binder distribution analysis, achieving a precision of ±1μm for sample collection [12][13]. Industry Impact - The UP series Binder floating instrument has established a solid intellectual property barrier with nearly 10 patents, including PCT international patents, and has gained trust from major players in the new energy sector [13][26]. Conclusion - The article concludes that binders, often overlooked, are crucial for battery performance. The introduction of high-precision tools allows for a better understanding of binder distribution, which can enhance battery consistency and reliability [26].