Yang Tao, Song Yan, Tian Xiaodong, Song Huaihe, Liu Zhanjun
CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, Shanxi, P.R. China.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, P.R. China.
Chemistry. 2020 Dec 9;26(69):16514-16520. doi: 10.1002/chem.202003493. Epub 2020 Nov 3.
Pitch has been used to prepare electrodes by high-temperature heat treatments for supercapacitors, lithium-ion batteries, on account of its rich aromatic ring structure. Here, the toluene-soluble component of pitch is used to prepare a kind of laminated carbon. This was realized by a template-free synthesis at low temperature with the addition of pressure. The toluene-soluble component has a small molecular weight, which makes the thermal deformation ability stronger and then enhances the orientation of the carbon layer with the help of pressure. The prepared anode exhibits a splendid electrochemical performance compared with the traditional graphite anode. A high stable capacity of approximately 550 mAh g at 50 mA g , which is much higher than graphite (372 mAh g ), is obtained. Also, when the current density is up to 2 A g , the capacity is about 150 mAh g . Surprisingly, it also delivers a superior cycling performance. And when used as the anode/cathode electrode for lithium-ion capacitors, a high energy density can be obtained. The present work offers an opportunity to utilize the pitch source in lithium energy storage with promising cycle life, high energy/power density, and low cost.
由于其丰富的芳香环结构，沥青已被用于通过高温热处理制备用于超级电容器、锂离子电池的电极。在此，沥青的甲苯可溶成分被用于制备一种层状碳。这是通过在低温下无模板合成并施加压力来实现的。甲苯可溶成分分子量小，这使得热变形能力更强，进而在压力的帮助下增强了碳层的取向。与传统石墨阳极相比，制备的阳极表现出优异的电化学性能。在50 mA g 时获得了约550 mAh g 的高稳定容量，这远高于石墨（372 mAh g ）。此外，当电流密度高达2 A g 时，容量约为150 mAh g 。令人惊讶的是，它还具有优异的循环性能。并且当用作锂离子电容器的阳极/阴极时，可以获得高能量密度。目前的工作为在锂储能中利用沥青源提供了机会，具有良好的循环寿命、高能量/功率密度和低成本。
