Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China.
Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing, 100081, China.
Adv Mater. 2017 Dec;29(48). doi: 10.1002/adma.201700598. Epub 2017 Apr 21.
The modular assembly of microstructures from simple nanoparticles offers a powerful strategy for creating materials with new functionalities. Such microstructures have unique physicochemical properties originating from confinement effects. Here, the modular assembly of scattered ketjen black nanoparticles into an oval-like microstructure via double "Fischer esterification," which is a form of surface engineering used to fine-tune the materials surface characteristics, is presented. After carbonization, the oval-like carbon microstructure shows promise as a candidate sulfur host for the fabrication of thick sulfur electrodes. Indeed, a specific discharge capacity of 8.417 mAh cm at 0.1 C with a high sulfur loading of 8.9 mg cm is obtained. The large-scale production of advanced lithium-sulfur battery pouch cells with an energy density of 460.08 Wh kg @18.6 Ah is also reported. This work provides a radically different approach for tuning the performance of a variety of surfaces for energy storage materials and biological applications by reconfiguring nanoparticles into desired structures.
通过简单的纳米颗粒进行微结构的模块化组装为创造具有新功能的材料提供了一种强大的策略。这种微结构具有独特的物理化学性质，源于限制效应。在这里，通过双“费歇尔酯化”将分散的 Ketjen 黑纳米颗粒组装成椭圆形微结构，这是一种用于微调材料表面特性的表面工程形式。碳化后，椭圆形碳微结构有望成为制造厚硫电极的硫主体候选材料。实际上，在高硫负载量为 8.9mg cm 的情况下，以 0.1 C 的倍率可以获得 8.417 mAh cm 的比放电容量。还报道了具有 460.08 Wh kg@18.6 Ah 能量密度的先进锂硫电池袋式电池的大规模生产。这项工作通过将纳米颗粒重新配置成所需的结构，为通过调整各种储能材料和生物应用的表面性能提供了一种截然不同的方法。
