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Lotus-Root-Like Carbon Fibers Embedded with Ni-Co Nanoparticles for Dendrite-Free Lithium Metal Anodes
Chen Chen1, Jun Guan1, Nian Wu Li1
1State Key Lab of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
Advanced Materials (Deerfield Beach, Fla.)
|May 7, 2021
Summary
This study introduces a lotus-root-like host material for lithium-metal anodes, effectively suppressing dendrite growth and volume expansion. This innovation enables highly stable lithium anodes with prolonged cycling performance.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium (Li)-metal anodes face critical challenges from lithium dendrite growth and significant volume changes during cycling.
- These issues hinder the practical application and long-term stability of high-energy-density lithium batteries.
Purpose of the Study:
- To propose a spatial control strategy for fabricating a novel host material to mitigate lithium dendrite formation and volume expansion.
- To investigate the performance of lotus-root-like Ni-Co hollow prisms@carbon fibers (NCH@CFs) as a host for stable lithium-metal anodes.
Main Methods:
- Fabrication of NCH@CFs with homogeneously distributed bimetallic Ni-Co particles on N-doped carbon fibers.
- Utilizing the 3D conductive network and hierarchical hollow structure of NCH@CFs to guide lithium deposition.
- Electrochemical testing of Li plating/stripping performance at a current density of 1 mA cm⁻² for 1200 hours.
Main Results:
- NCH@CFs demonstrated reduced overpotential for Li nucleation due to bimetallic Ni-Co particles acting as nucleation sites.
- The 3D conductive network effectively altered the electric field distribution.
- The hierarchical hollow structure provided ample void space, accommodating volume expansion and promoting uniform, non-dendritic Li growth, resulting in stable cycling for 1200 hours with low voltage hysteresis.
Conclusions:
- The NCH@CFs host successfully addresses the critical issues of lithium dendrite growth and volume expansion in Li-metal anodes.
- This engineered host material significantly enhances the stability and cycle life of lithium-metal batteries, paving the way for practical applications.
