Carbon Quantum Dot Modified Reduced Graphene Oxide Framework for Improved Alkali Metal Ion Storage Performance
Shikai Jin1, Omar Allam1,2, Kyungbin Lee1
1George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA.
Small (Weinheim an Der Bergstrasse, Germany)
|August 4, 2022
Summary
This study developed a hybrid carbon material for enhanced alkali-ion batteries. The material shows improved capacity and stability for lithium-ion storage, offering insights for future battery designs.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Organic materials with redox-active oxygen groups are promising for alkali-ion storage.
- These materials offer earth-abundant constituents, tunable structures, and enhanced energy storage.
Purpose of the Study:
- To develop and investigate a hybrid carbon framework for Li-, Na-, and K-ion storage.
- To understand the redox mechanism and electrochemical properties of the new material.
- To explore the structure-electrochemical reactivity trends of carbon quantum dots (CQDs) for alkali-ion storage.
Main Methods:
- One-pot solvothermal reduction method to synthesize the hybrid carbon framework.
- Electrochemical testing for charge storage performance with Li-, Na-, and K-ions.
- Density functional theory (DFT) calculations to analyze CQD structure-electrochemical reactivity.
Main Results:
- The hybrid cathode demonstrated improved charge storage performance for alkali-ions.
- Impressive reversible capacity (257 mAh g-1 at 50 mA g-1) and rate capability (111 mAh g-1 at 1 A g-1) with Li-ion.
- Excellent cycling stability with 79% retention after 10,000 cycles for Li-ion.
Conclusions:
- The hybrid carbon framework incorporating CQDs enhances alkali-ion storage performance.
- DFT calculations revealed CQD structure-electrochemical reactivity trends for different alkali-ions.
- The findings offer valuable insights for designing CQD-based materials for optimal alkali-ion storage.
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