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Reduced Graphene Oxide/LiI Composite Lithium Ion Battery Cathodes
Sanghyeon Kim, Sung-Kon Kim1, Pengcheng Sun
1School of Chemical Engineering, Chonbuk National University , 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Republic of Korea.
Nano Letters
|October 21, 2017
Summary
Researchers developed a novel reduced graphene oxide/lithium iodide (rGO/LiI) composite cathode for safer, high-performance lithium-ion batteries. This innovation overcomes challenges associated with traditional Li-iodine batteries, enabling stable cycling and high energy density.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-iodine chemistry offers high power and energy density for electrochemical energy storage.
- Traditional Li-iodine batteries face safety and fabrication issues due to Li metal and elemental iodine's high vapor pressure.
Purpose of the Study:
- To circumvent safety and fabrication challenges by utilizing lithium iodide (LiI) as a cathode material.
- To present the fabrication and electrochemical performance of a reduced graphene oxide (rGO)/LiI composite cathode for Li-ion batteries.
Main Methods:
- Fabrication of a composite cathode by coating LiI onto reduced graphene oxide (rGO) via infiltration and drying.
- Electrochemical characterization of the free-standing rGO/LiI electrodes, including cycling stability, rate performance, and hysteresis measurements.
Main Results:
- The rGO/LiI composite cathode demonstrated stable long-term cycling over 100 cycles at 0.5 C with a high specific capacity of 200 mAh g⁻¹.
- The electrodes exhibited good rate performance and minimal hysteresis (0.056 V at 1 C), with significantly suppressed shuttling.
- Improved electrochemical performance is attributed to strong interactions between LiI and rGO, and the 3D structure enhancing ion and electron transport.
Conclusions:
- The developed rGO/LiI composite cathode enables the use of LiI as a viable Li-ion battery cathode, overcoming limitations of traditional Li-iodine systems.
- The composite structure enhances electrochemical properties, offering a promising alternative for high-performance and safer energy storage solutions.
