Wang Jia, Shao Di, Fan Zengjie, Xu Chong, Dou Hui, Xu Miao, Ding Bing, Zhang Xiaogang
Jiangsu Key Laboratory of Electrochemical Energy-Storage Technologies, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
Shanghai Institute of Space Power-Sources/State Key Laboratory of Space Power-Sources, Shanghai 200233, China.
ACS Appl Mater Interfaces. 2024 May 22;16(20):26209-26216. doi: 10.1021/acsami.4c02959. Epub 2024 May 11.
Thick electrodes with high mass loading and increased content of active materials are critical for achieving higher energy density in contemporary lithium-ion batteries (LIBs). Nonetheless, producing thick electrodes through the commonly used slurry coating technology remains a formidable challenge. In this study, we have addressed this challenge by developing a dry electrode technology by using ultralong multiwalled carbon nanotubes (MWCNT) as a conductive additive and secondary binder. The mixing process of electrode compositions and the fibrillation process of the polytetrafluoroethylene (PTFE) binder were optimized. The resulting LiCoO (LCO) electrode exhibited a remarkable mass loading of 48 mg cm and an active material content of 95 wt %. Notably, the thick LCO electrode demonstrated a superior mechanical strength and electrochemical performance. After 100 cycles at a current density of 1/3 C, the electrode still exhibited a capacity retention of 91% of its initial capacity. This dry electrode technology provides a practicable and scalable approach to the powder-to-film LIB electrode manufacturing process.
具有高质量负载和更高活性材料含量的厚电极对于在当代锂离子电池（LIBs）中实现更高的能量密度至关重要。尽管如此，通过常用的浆料涂覆技术生产厚电极仍然是一项艰巨的挑战。在本研究中，我们通过开发一种干电极技术来应对这一挑战，该技术使用超长多壁碳纳米管（MWCNT）作为导电添加剂和二次粘合剂。优化了电极组合物的混合过程和聚四氟乙烯（PTFE）粘合剂的原纤化过程。所得的LiCoO（LCO）电极表现出48 mg cm的显著质量负载和95 wt%的活性材料含量。值得注意的是，厚LCO电极表现出优异的机械强度和电化学性能。在1/3 C的电流密度下循环100次后，该电极仍保持其初始容量的91%。这种干电极技术为从粉末到薄膜的LIB电极制造过程提供了一种可行且可扩展的方法。
