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Published on: November 11, 2013
Stable Lithium Metal Batteries in Ester Electrolytes Enabled by High-Entropy Alloy-Modified Graphitized Carbon Paper
Meina Huang1, Jinping Xu1, Taiyu Lyu1
1Key Laboratory of Advanced Energy Storage Technology, Fujian Province University; Fujian Provincial Industry Technologies Development Base for New Energy; Collaborative Innovation Platform for Advanced Electrochemical Energy Storage Technology; National User-Side Energy Storage Innovation Research and Development Center; Tan Kah Kee Innovation Laboratory (IKKEM); College of Energy, Xiamen University, Xiamen, Fujian, China.
A novel high-entropy alloy anode enhances lithium metal battery performance by improving lithium uniformity and stability. This breakthrough addresses dendrite formation and volume expansion, paving the way for advanced energy storage solutions.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium metal batteries offer high energy density but suffer from dendrite formation, dead lithium, and volume expansion.
- These issues hinder their practical application and long-term stability.
Purpose of the Study:
- To develop an innovative anode strategy for lithium metal batteries.
- To address challenges like lithium dendrite formation and volume expansion.
- To enhance the stability and performance of lithium metal anodes.
Main Methods:
- Synthesized a high-entropy alloy (HEA) of Mg, Ag, Cu, Mn, and Ni on graphitized carbon paper.
- Utilized impregnation and high-temperature thermal reduction for anode fabrication.
- Employed a three-dimensional (3D) collector with synergistic HEA nanoparticles and LiC6.
Main Results:
- The HEA anode demonstrated enhanced lithiophilicity, promoting uniform lithium nucleation.
- Symmetric cells achieved over 2400 h of cycling stability at 0.5 mA cm-2/1 mAh cm-2 in ester electrolytes.
- Full cells with an NCM-811 cathode showed high coulombic efficiency (99.6% at 0.5 C after 200 cycles, 99.8% at 1 C after 300 cycles).
Conclusions:
- Designing amphiphilic lithium sites on 3D collectors is an effective strategy for optimizing lithium metal battery anodes.
- The developed HEA anode significantly improves cycling stability and coulombic efficiency.
- This work offers new directions for advancing lithium metal battery technology.
