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 LiCoO₂ (LCO) electrode exhibited a remarkable mass loading of 48 mg cm^–2 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.

中文翻译：

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用于二次粘合剂辅助干涂技术的超长碳纳米管高面积容量阴极


具有高质量负载和增加活性材料含量的厚电极对于当代锂离子电池（LIB）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个艰巨的挑战。在这项研究中，我们通过使用超长多壁碳纳米管（MWCNT）作为导电添加剂和辅助粘合剂开发干电极技术来解决这一挑战。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LiCoO ₂ (LCO)电极表现出48 mg cm ^–2 的显着质量负载和95 wt%的活性材料含量。值得注意的是，厚的 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，该电极仍表现出其初始容量的91%的容量保持率。这种干电极技术为粉末薄膜锂离子电池电极制造工艺提供了一种实用且可扩展的方法。