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Toward Fast-Charging and Dendritic-Free Li Growth on Natural Graphite Through Intercalation/Conversion on MoS2
Joo Hyeong Suh1, Sang A Han2, Soo Young Yang3
1Department of Advanced Materials Engineering for Information and Electronics, Integrated Education Institute for Frontier Science & Technology (BK21 Four), Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin, 17104, Republic of Korea.
Molybdenum disulfide (MoS2) coating on graphite anodes improves lithium-ion battery fast-charging by stabilizing the solid-electrolyte interphase (SEI). This enhances cycling performance and reduces charging times for electric vehicles.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Fast charging of lithium-ion batteries causes uneven lithium plating on graphite anodes, degrading performance and posing safety risks.
- The solid-electrolyte interphase (SEI) layer formation is critical for long-term cycling stability but is affected by side reactions during fast charging.
- Optimizing SEI properties is essential for enhancing battery performance under demanding charging conditions.
Purpose of the Study:
- To investigate the effect of molybdenum disulfide (MoS2) coating on natural graphite (NG) anodes for lithium-ion batteries.
- To analyze how MoS2 coating modulates the SEI layer properties during fast charging.
- To evaluate the impact of MoS2 coating on electrochemical performance, charging speed, and cycling stability.
Main Methods:
- Coating natural graphite (NG) with molybdenum disulfide (MoS2).
- Electrochemical characterization of MoS2-coated NG anodes under fast-charging conditions.
- Analysis of SEI layer composition and stability using intercalation and conversion reactions.
- Fabrication and testing of full-cell configurations to assess practical performance.
Main Results:
- MoS2 coating transforms into Li2S and Mo nanoclusters, altering SEI composition and enhancing stability.
- The modified SEI layer promotes faster Li+ transport and reduces interfacial resistance.
- MoS2-NG anodes exhibit improved fast-charging capability and stable cycling over 300 cycles at 3.0 C-charging/1.0 C-discharging.
- Full cells achieve an 80% state of charge in just 14.7 minutes.
Conclusions:
- MoS2 coating is an effective strategy to improve the fast-charging performance and long-term cycling stability of graphite anodes.
- The modulated SEI layer by MoS2 is key to enabling rapid Li+ transport and reducing degradation.
- This technology shows significant potential for applications requiring fast charging, such as electric vehicles.
