碳化
中间相
材料科学
电化学
多孔性
化学工程
堆积
离子
锂(药物)
复合材料
电极
有机化学
化学
扫描电子显微镜
物理化学
液晶
医学
工程类
内分泌学
光电子学
作者
Xin Gong,Bin Lou,Ran Yu,Zhichen Zhang,Shuhai Guo,Gang Li,Bo Wu,Dong Liu
标识
DOI:10.1016/j.fuproc.2021.106832
摘要
To clarify the relationship between the chemical compositions of green mesocarbon microbeads (GMCMBs) and the electrochemical behavior of carbonized mesocarbon microbeads (CMCMBs) for lithium-ion batteries, GMCMBs were prepared by emulsifying mesophase pitch (MP) with various anisotropic contents derived from FCC decant oil. Subsequently, GMCMBs were carbonized at 1000 °C, and their electrochemical behaviors were investigated. It was found that the GMCMB prepared from MP with a high anisotropic content (98 vol%) exhibited highly ordered aromatic lamellae stacking (ID/IG = 0.68) and a high condensation degree (IOS = 0.268). Therefore, CMCMB-98 with a highly ordered structure (ID/IG = 1.01) and low porosity (SBET = 80 m2/g) was formed, resulting in a high initial coumbic efficiency (74.8%). In addition, the GMCMB prepared from MP with a low anisotropic content (12 vol%) had more alkyl side chains and light components (ICHS = 0.50 TS = 22.7 wt%). CMCMB-12 with high porosity (SBET = 390.65 m2/g) and disorder degree (ID/IG = 1.21) was produced after the carbonization process, leading to a high capacity and rapid solid-state diffusion speed of Li+. Hence, CMCMB-12 can deliver the highest reversible capacity (405 mAh g−1 at 500 mA g−1 over 200 cycles) and excellent rate performance.
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