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Monolayer Contact Doping of Silicon Surfaces and Nanowires Using Organophosphorus Compounds
Published on: December 2, 2013
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Electron-donor doping enhanced Li storage in electride Ca2N monolayer: a first-principles study
Hewen Wang1,2, Musheng Wu2, Zhengfang Tian1
1College of Chemistry and Chemical Engineering, Hubei Key Laboratory for Processing and Application of Catalytic Materials, Huanggang Normal University, Huanggang 438000, People's Republic of China.
Summary
Compressive strain enables lithium (Li) storage in Ca2N monolayers by enhancing Li adsorption. Electron-donor doping, particularly with O and F, further improves Li-ion battery anode performance and maintains excellent rate capabilities.
Area of Science:
- Materials Science
- Computational Chemistry
- Electrochemistry
Background:
- Lithium (Li) adsorption on Ca2N monolayers was previously deemed energetically unfavorable for Li storage.
- Ca2N monolayers showed promise for sodium (Na) storage but not Li storage.
Purpose of the Study:
- To investigate methods for enabling Li storage in Ca2N monolayers.
- To explore the potential of modified Ca2N materials as anodes for Li-ion batteries.
Main Methods:
- First-principles calculations were employed to study Li adsorption on Ca2N monolayers.
- Compressive strain effects on Li-Ca2N interactions were analyzed.
- Charge distribution analysis was performed.
- Electron-donor doped Ca2N materials were computationally screened.
Main Results:
- Compressive strain significantly enhances Li adsorption on Ca2N, preventing Li clustering and enabling storage.
- Enhanced Li adsorption is attributed to increased surface charge density and confined charge distribution under strain.
- Oxygen (O) and Fluorine (F) doped Ca2N exhibit excellent performance, with predicted Li storage capacities of ~567.9 and ~565.9 mAh g-1, respectively.
- Doping does not alter the metallic electronic structure or low Li-ion migration barriers, ensuring good rate performance.
Conclusions:
- Compressive strain is a viable strategy to facilitate Li storage in 2D electrides like Ca2N.
- Electron-donor doping offers a pathway to optimize Ca2N-based materials for high-performance Li-ion battery anodes.
- This research provides insights into Li interactions with 2D materials and suggests material modification approaches for battery applications.
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