Samsung Advanced Institute of Technology , Gyeonggi-do 443-803 , Republic of Korea.
ACS Appl Mater Interfaces. 2018 Jul 25;10(29):24549-24553. doi: 10.1021/acsami.8b07012. Epub 2018 Jul 11.
High-performance lithium-ion batteries (LIBs) are in increasing demand for a variety of applications in rapidly growing energy-related fields including electric vehicles. To develop high-performance LIBs, it is necessary to comprehensively understand the degradation mechanism of the LIB electrodes. From this viewpoint, it is crucial to investigate how the electrical properties of LIB electrodes change under charging and discharging. Here, we probe the local electrical properties of LIB electrodes with nanoscale resolution by scanning spreading resistance microscopy (SSRM). Via quantitative and comparative SSRM measurements on pristine and degraded LIB anodes of Si-C composites blended with graphite (Gr) particles, the electrical degradation of the LIB anodes is visualized. The electrical conductivity of the Si-C composite particles considerably degraded over 300 cycles of charging and discharging, whereas the Gr particles maintained their conductivity.
高性能锂离子电池（LIB）在电动汽车等快速发展的能源相关领域的各种应用中需求不断增加。为了开发高性能的 LIB，有必要全面了解 LIB 电极的降解机制。从这个角度来看，研究 LIB 电极在充电和放电过程中电性能如何变化至关重要。在这里，我们通过扫描扩展电阻显微镜（SSRM）以纳米级分辨率探测 LIB 电极的局部电性能。通过对掺有石墨（Gr）颗粒的 Si-C 复合材料的原始和退化 LIB 阳极进行定量和比较 SSRM 测量，可视化了 LIB 阳极的电退化。Si-C 复合颗粒的电导率在 300 次充电和放电循环后明显下降，而 Gr 颗粒则保持其电导率。
