Effect of conductive agent on the electronic conductivity of mixed powder & electrode

Positive and negative electrode powder materials, separators, electrolytes, conductive agents, binders, current collectors, etc. are the main raw materials for the manufacture of lithium-ion batteries; the production of lithium-ion batteries is the process of processing these raw materials into batteries under the optimal process conditions. Changes in the parameters of these raw materials require targeted optimization and adjustment of the process conditions to obtain lithium-ion batteries with optimal electrical performance. The design of the parameters of the positive and negative electrode sheets of lithium-ion batteries is the key to the development of lithium battery processes, including active material loading, porosity, thickness, and the ratio between active materials, conductive agents, and binders. Among them, the type , content, and performance of the conductive agent are key factors affecting the electron transmission during the charging and discharging process of lithium-ion batteries, and the electron conduction characteristics directly determine the quality of the electrochemical performance.

Lithium battery double-layer coating technology principle

Double-layer coating is a multi-layer microstructure design for lithium-ion battery pole pieces to improve electrode performance, such as:

Sun Jie's team from Tianjin University: Micro-multifunctional additives significantly improve the ultra-high voltage performance of 4.8 V nickel-rich cathode and silicon-oxygen anode batteries

Determined to win ‖ Sun Jie's team from Tianjin University: Micro-multifunctional additives significantly improve the ultra-high voltage performance of 4.8 V nickel-rich cathode and silicon-oxygen anode batteries

 In December 2024 , Professor Sun Jie, Dr. Zhang Yiming of Tianjin University and Dr. Wang Lue of Guolian Automotive Power Battery Research Institute Co., Ltd. published an online paper in the journal Advanced Energy Materials (impact factor > 24.4) titled " Trace Multifunctional Additive Enhancing 4.8 V Ultra-High Voltage Performance of Ni-Rich Cathode and SiO _x  Anode Battery ". The study proposed a functional group integration strategy for the molecular structure design of additives, and developed a single, trace multifunctional electrolyte additive through the active synergy of multiple functional groups and electronic structures. 2- Cyano -3- fluoropyridine -5- boronic acid pinacol ester (FTDP) can simultaneously construct a strong CEI and SEI on the surface of the positive and negative electrodes , and play a multifunctional role in scavenging HF , quenching free radicals and inhibiting the dissolution of transition metal ions. With only 0.2 wt.% FTDP added , NCM811/Li batteries exhibited excellent electrochemical performance even under the harsh conditions of ultra-high voltage (4.8 V) , high temperature (60 °C) , and high rate  (10 C) . The capacity retention rate of 1.6 Ah NCM811/SiO x soft-pack batteries was as high as 84.0% after 300 cycles at _a current of 1.0 A. This work provides a practical reference for the rational screening and design of trace multifunctional electrolyte additives to promote the development of high energy density lithium-ion batteries .    

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