The ever-increasing demands for advanced lithium-ion batteries have greatly stimulated the quest for robust electrodes with a high areal capacity. Producing thick electrodes from a high-performance active material would maximize this parameter. However, above a critical thickness, solution-processed films typically encounter electrical/mechanical problems, limiting the achievable areal capacity and rate performance as a result. Herein, we show that two-dimensional titanium carbide or carbonitride nanosheets, known as MXenes, can be used as a conductive binder for silicon electrodes produced by a simple and scalable slurry-casting technique without the need of any other additives. The nanosheets form a continuous metallic network, enable fast charge transport and provide good mechanical reinforcement for the thick electrode (up to 450 µm). Consequently, very high areal capacity anodes (up to 23.3 mAh cm−2) have been demonstrated.
展开▼
机译：对高级锂离子电池的不断增长的需求极大地刺激了对具有高面积容量的坚固电极的需求。用高性能活性材料生产厚电极将使该参数最大化。然而，超过临界厚度，固溶处理的膜通常会遇到电气/机械问题，结果限制了可达到的面积容量和速率性能。本文中，我们显示了二维碳化钛或碳氮化物纳米片，称为MXenes，可以用作通过简单且可扩展的浆料浇铸技术生产的硅电极的导电粘合剂，而无需任何其他添加剂。纳米片形成了连续的金属网络，能够快速进行电荷传输，并为厚电极（最大450μm）提供良好的机械增强。因此，已经证明了非常高的面容量阳极（高达23.3 mAh cm -2 ）。
展开▼
