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Advanced Lithium-Ion Capacitors Based on Pre-Lithiated Si/SiOx Negative Electrode

Tuesday, 31 May 2022: 08:05
West Meeting Room 216 (Vancouver Convention Center)
N. G. Kim, D. J. Chung (Hanyang University), M. S. Park (Kyung Hee University), and H. Kim (Hanyang University)
Lithium-ion capacitor (LIC) was developed to increase the energy density of conventional electrochemical double-layer capacitors. However, the inherent relatively low theoretical capacity and sluggish interfacial kinetics of conventionally used graphite anode in LIC should be overcome. In this work, we investigated pre-lithiated carbon coated Si/SiOx negative electrode and activated carbon positive electrode to develop high performance LIC. Si/SiOx nanoparticles were prepared by simple sol-gel reaction, followed by carbon coating and pre-lithiation process. LIC with pre-lithiated carbon coated Si/SiOx negative electrode showed improved rate capability and cycle performance at a current density of 850 mA g-1 lasting for up to 1000 cycles compared to LIC with the conventional graphite anode. These results show that pre-lithiated carbon coated Si/SiOx negative electrode is superior to the conventional graphite negative electrode. In this presentation, the pre-lithiation conditions and electrochemical properties of carbon coated Si/SiOx anode in LIC will be discussed more in detail.