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Oxygen-Containing Functional Groups Regulating the Carbon/Electrolyte Interfacial Properties Toward Enhanced K+
Yufan Peng1, Zhen Chen2,3, Rui Zhang1
1College of Materials Science and Engineering, Hunan Joint International Laboratory of Advanced Materials and Technology of Clean Energy, Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, Hunan University, Changsha, 410082, People's Republic of China.
Nano-Micro Letters
|September 13, 2021
Summary
Oxygen-doped graphite oxide enhances potassium ion battery anodes by improving K+ storage. Specific oxygen groups (C=O, COOH) boost capacity and create a stable solid electrolyte interphase (SEI) for better performance.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Oxygen-containing functional groups are known to improve potassium ion (K+) storage in carbonaceous materials.
- The precise mechanism for this performance enhancement in potassium ion batteries (PIBs) remains incompletely understood.
- Graphite oxide (GO) is a promising carbonaceous material for energy storage applications.
Purpose of the Study:
- To investigate the role of oxygen functional groups in GO as an anode material for PIBs.
- To elucidate the K+ storage mechanism in oxygen-doped graphite oxide.
- To establish the relationship between oxygen functional groups and solid electrolyte interphase (SEI) formation.
Main Methods:
- Electrochemical testing of oxygen-doped graphite oxide (GO) and raw graphite as anode materials for PIBs.
- In situ Raman spectroscopy to study the K+ storage mechanism.
- In situ Fourier transform infrared (FT-IR) spectroscopy and in situ electrochemical impedance spectroscopy (EIS) to analyze SEI formation.
Main Results:
- Oxygen-doped GO exhibits superior rate capability and long-term cycle performance compared to raw graphite.
- An adsorption-intercalation hybrid K+ storage mechanism is identified, with capacity enhancement primarily from reversible K+ adsorption/desorption at oxygen sites.
- Carboxyl (COOH) and carbonyl (C=O) groups are identified as the key contributors to capacity enhancement, while C-O-C and OH groups have less impact.
- Oxygen functional groups effectively regulate SEI composition, leading to a more conductive, intact, and robust SEI layer.
Conclusions:
- Oxygen-doped graphite oxide is a highly effective anode material for potassium ion batteries.
- The study clarifies the K+ storage mechanism in GO, highlighting the crucial role of specific oxygen functional groups.
- A direct correlation is established between the type and content of oxygen functional groups and the resulting SEI properties, offering insights for designing advanced anode materials.
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