Chen Bing-Hong, Chuang Shang-I, Liu Wei-Ren, Duh Jenq-Gong
Department of Materials Science and Engineering, National Tsing Hua University , No. 101, Section 2, Kuang-Fu Road, Hsinchu 30013, Taiwan.
Department of Chemical Engineering, Chung Yuan Christian University , 2200, Chung Pei Road, Chung Li 32023, Taiwan.
ACS Appl Mater Interfaces. 2015 Dec 30;7(51):28166-76. doi: 10.1021/acsami.5b05858. Epub 2015 Dec 18.
In this study, a jumbo silicon/silicon carbide (Si/SiC) composite (JSC), a novel anode material source, was extracted from solar power industry cutting waste and used as a material for lithium-ion batteries (LIBs), instead of manufacturing the nanolized-Si. Unlike previous methods used for preventing volume expansion and solid electrolyte interphase (SEI), the approach proposed here simply entails applying surface modification to JSC-based electrodes by using nitrogen-atmospheric pressure plasma jet (N-APPJ) treatment process. Surface organic bonds were rearranged and N-doped compounds were formed on the electrodes through applying different plasma treatment durations, and the qualitative examinations of before/after plasma treatment were identified by X-ray photoelectron spectroscopy (XPS) and electron probe microanalyzer (EPMA). The surface modification resulted in the enhancement of electrochemical performance with stable capacity retention and high Coulombic efficiency. In addition, depth profile and scanning electron microscope (SEM) images were executed to determine the existence of Li-N matrix and how the nitrogen compounds change the surface conditions of the electrodes. The N-APPJ-induced rapid surface modification is a major breakthrough for processing recycled waste that can serve as anode materials for next-generation high-performance LIBs.
在本研究中，一种新型负极材料源——大型硅/碳化硅（Si/SiC）复合材料（JSC），从太阳能行业切割废料中提取出来，并用作锂离子电池（LIBs）的材料，而非制造纳米硅。与以往用于防止体积膨胀和固态电解质界面（SEI）的方法不同，这里提出的方法只需通过使用氮大气压等离子体射流（N-APPJ）处理工艺对基于JSC的电极进行表面改性。通过施加不同的等离子体处理持续时间，电极上的表面有机键被重新排列，形成了氮掺杂化合物，并且通过X射线光电子能谱（XPS）和电子探针微分析仪（EPMA）对等离子体处理前后进行了定性检查。表面改性导致电化学性能增强，具有稳定的容量保持率和高库仑效率。此外，还进行了深度剖析和扫描电子显微镜（SEM）图像分析，以确定Li-N基体的存在以及氮化合物如何改变电极的表面状况。N-APPJ诱导的快速表面改性是处理可作为下一代高性能LIBs负极材料的回收废料的一项重大突破。
