| Improving lithium-ion battery efficiency using Si-lithium titanium oxide and graphene coating |
Jin Woo Lee, Suk Jun Kim
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| School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education, Cheonan, 31253, South Korea |
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Received: September 2, 2024; Revised: November 11, 2024 Accepted: November 15, 2024. Published online: December 10, 2024. |
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| ABSTRACT |
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This paper introduces a novel approach to addressing the challenges related to the use of Si as an anode material in lithium-ion batteries (LIBs). Si is recognized for its high theoretical capacity but is limited by its significant volume expansion and low electrical conductivity. This study synthesized Si-embedded lithium titanium oxide (SLTO) by chemical vapor deposition. SLTO effectively mitigates the volume expansion of Si and enhances its overall electrochemical performance. Furthermore, a reduced graphene oxide (rGO) coating was applied to SLTO (rGO@SLTO) to establish a conductive network around the powder to improve the electrical conductivity and mitigate volume changes. X-ray diffraction and Raman spectroscopy confirmed the presence of well-coated rGO on the SLTO surface. Performance evaluation through charge-discharge tests and electrochemical impedance spectroscopy demonstrated that the optimized SLTO to rGO ratio significantly enhanced the electrical conductivity. The rGO@SLTO composite achieved an initial discharge capacity of 1890.1 mAh g−1 at 1 A g−1 and an initial Coulombic efficiency of 85.13%. The significantly reduced charge-transfer resistances (from 109.11 Ω without rGO to 14.54 Ω with rGO) also contributed to a significant improvement in the electrochemical performance of the LIBs. |
| Key words:
Lithium-ion batteries · Silicon anode · Lithium titanium oxide · Reduced graphene oxide · Chemical vapor deposition |
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