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Mixed ionic/electronic conducting nanosheet arrays for stable lithium storage
Mouping Fan1, Zexi Huang1, Youchen Chen1
1Institute of Batteries, School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, People's Republic of China.
Nanotechnology
|August 31, 2021
Summary
Researchers developed a novel lithiophilic nanosheet array collector (Ni-LONSs) for lithium metal batteries (LMBs). This collector promotes uniform lithium deposition and enhances battery lifespan, addressing dendrite growth issues in LMBs.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium metal batteries (LMBs) offer high energy density but suffer from lithium dendrite growth, hindering practical application.
- Developing effective current collectors is crucial for stable lithium metal anode performance.
Purpose of the Study:
- To engineer a lithiophilic current collector for uniform lithium deposition and improved cycling stability in LMBs.
- To investigate the electrochemical performance of a novel Ni-LONSs collector for lithium metal anodes.
Main Methods:
- Fabrication of lithiophilic nanosheet arrays (Ni-LONSs) composed of electronic conductor Ni and ionic conductor Li2O on Ni foil.
- Electrochemical testing of Ni-LONSs collectors in symmetric lithium cells and LiFePO4//Li full cells.
Main Results:
- The Ni-LONSs collector demonstrated excellent lithium storage performance, inducing uniform Li deposition due to the lithiophilic Li2O layer.
- Ni-LONSs collector exhibited superior cycling stability (97.2% CE after 280 cycles) compared to bare Ni foil (95.7% CE after 100 cycles).
- Extended cycling lifespan of 340 h for Ni-LONSs collector versus 120 h for Ni foil at 0.5 mA cm-2 with 1.0 mAh cm-2.
Conclusions:
- The Ni-LONSs collector, with its mixed ionic/electronic conducting properties and nanosheet array structure, effectively suppresses lithium dendrites.
- This lithiophilic collector shows great potential for advancing the practical application and development of high-performance lithium metal batteries.
