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Published on: November 11, 2013
High ICE Hard Carbon Anodes for Lithium-Ion Batteries Enabled by a High Work Function.
Naiqing Ren1, Lifeng Wang1, Xiaodong He1
1CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, University of Science and Technology of China, Hefei, Anhui 230026, China.
Improving hard carbon anodes for lithium-ion batteries (LIBs) is crucial. This study enhances initial Coulombic efficiency (ICE) by introducing C-Cl bonds, reducing solid electrolyte interface (SEI) film formation for better battery performance.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Hard carbons (HC) from biomass are sustainable anodes for lithium-ion batteries (LIBs).
- Low initial Coulombic efficiency (ICE) of HC anodes limits their practical application in full cells.
- Reducing solid electrolyte interface (SEI) formation is key to improving ICE.
Purpose of the Study:
- To enhance the ICE of hard carbon anodes for LIBs.
- To investigate the effect of surface modification on HC anode performance.
- To provide a method for reducing SEI formation in LIBs.
Main Methods:
- Surface modification of cotton-derived hard carbon with C-Cl bonds.
- X-ray absorption near-edge structure (XANES) spectroscopy.
- Density functional theory (DFT) calculations.
Main Results:
- Introduction of C-Cl bonds enhanced the work function of the HC anode.
- Cl-doping inhibited solvent molecule reduction and SEI film formation.
- ICE improved from 64.8% to 78.1%.
Conclusions:
- Surface modification with C-Cl bonds is an effective strategy to improve HC anode ICE.
- Reduced SEI formation contributes to enhanced battery performance.
- This approach offers a promising route for developing high-performance LIB anodes.
