Iterative Synthesis of Contorted Macromolecular Ladders for Fast-Charging and Long-Life Lithium Batteries
Iterative Synthesis of Contorted Macromolecular Ladders for Fast-Charging and Long-Life Lithium Batteries
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DOI：
10.1021/jacs.2c06527
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发表时间：
2022-07-25
影响因子：
15
通讯作者：
Xu, Yunyao
中科院分区：
文献类型：
--
作者：
Jin, Zexin;Cheng, Qian;Xu, Yunyao
我们在这里报告了一个迭代合成的长螺旋苝二酰亚胺（hPDI[n]）纳米带的长度高达16个稠合苯环。这些扭曲的、梯形共轭的、原子级精确的纳米带显示出作为有机快速充电和长寿命电池阴极的巨大潜力。通过调节hPDI[n]低聚物的长度，我们可以同时调节材料的电导率和离子扩散率。阶梯的长度调节电子传输的共轭和锂离子传输的扭曲。最长的低聚物hPDI[6]在制造为锂电池中的阴极时，具有高导电性和高离子扩散性。这种电极材料具有高功率密度，可以在不到1分钟的时间内充电到其最大容量的66%。值得注意的是，这种材料还具有出色的循环稳定性，可以运行高达10，000充电？放电循环而没有任何明显的容量衰减。本文介绍的设计原理为有机电池电极的可持续性、快速充电和持久性指明了一条清晰的道路。
We report here an iterative synthesis of long helical perylene diimide (hPDI[n]) nanoribbons with a length up to 16 fused benzene rings. These contorted, ladder-type conjugated, and atomically precise nanoribbons show great potential as organic fast-charging and long-lifetime battery cathodes. By tuning the length of the hPDI[n] oligomers, we can simultaneously modulate the electrical conductivity and ionic diffusivity of the material. The length of the ladders adjusts both the conjugation for electron transport and the contortion for lithium-ion transport. The longest oligomer, hPDI[6], when fabricated as the cathode in lithium batteries, features both high electrical conductivity and high ionic diffusivity. This electrode material exhibits a high power density and can be charged in less than 1 min to 66% of its maximum capacity. Remarkably, this material also has exceptional cycling stability and can operate for up to 10,000 charging???discharging cycles without any appreciable capacity decay. The design principles described here chart a clear path for organic battery electrodes that are sustainable, fast-charging, and long lasting.Superscript/Subscript Available