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Modification of LiMn2O4 Cathodes to Boost Kinetics Match via rGO for High-Performance Rocking-Chair Lithium-Ion
Haoquan Li1, Nuo Chen1, Tianfu Liu1
1Institute of Soft-Matter and Advanced Functional Materials, Carbon New Materials Industry Technology Center of Gansu Province, Key Laboratory of Special Function Materials and Structure Design of Ministry of Education, School of Materials and Energy, Lanzhou University, Lanzhou City, 730000 Gansu Province, China.
Rocking-chair lithium-ion capacitors (RLICs) use a modified lithium manganate (LMO) and reduced graphene oxide (rGO) cathode. This composite enhances conductivity and anode matching, improving energy storage performance for practical applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Rocking-chair lithium-ion capacitors (RLICs) offer improved performance over traditional lithium-ion capacitors (LICs).
- Key challenges for RLICs include poor cathode conductivity and cathode-anode material mismatch, hindering commercialization.
- Electrolyte consumption during cycling in LICs leads to increased internal resistance.
Purpose of the Study:
- To develop a modification strategy for enhancing cathode conductivity and improving cathode-anode matching in RLICs.
- To address the limitations of poor conductivity in cathode materials for energy storage devices.
- To provide a viable approach for developing energy storage devices suitable for production and real-world applications.
Main Methods:
- In situ growth of lithium manganate (LMO) integrated into a three-dimensional conductive network using reduced graphene oxide (rGO).
- Fabrication of an RLIC by combining the optimized LMO/rGO composite cathode with an activated carbon (AC) anode.
- Electrochemical performance testing, including rate capability, ion diffusion, cycling stability, and energy/power density measurements.
Main Results:
- The LMO/rGO composite cathode exhibited significantly improved conductivity, lithium-ion diffusion rates, and cycling stability.
- The assembled RLIC demonstrated a high energy density of 239.11 Wh/kg at 400 W/kg.
- Remarkable energy density of 39.9 Wh/kg was maintained even at a high power density of 200 kW/kg.
Conclusions:
- The proposed modification strategy effectively enhances cathode conductivity and optimizes cathode-anode matching in RLICs.
- The LMO/rGO composite cathode is crucial for the superior electrochemical performance of the developed RLICs.
- This approach offers a promising pathway for the development of advanced energy storage solutions for practical applications.
