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Published on: March 7, 2018
Constructing Ag@SiO2-TiO2 Nanofiber Interlayers with a Three-Dimensional Lithiophilic Gradient Framework for an
Weihao Zhao1, Jinxin Fan2, Yuan Tian1
1Institute for New Energy Materials and Low-Carbon Technologies, Tianjin Key Laboratory of Advanced Functional Porous Materials, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, P. R. China.
Researchers developed a novel gradient structure using silver nanoparticles within a 3D framework to stabilize lithium metal anodes. This interlayer suppresses dendrite growth, significantly extending battery lifespan and improving stability for rechargeable lithium batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Lithium metal batteries offer high energy density due to the Li metal anode's capacity.
- Challenges include Li dendrite growth and volume changes during cycling, hindering practical application.
Purpose of the Study:
- To design and fabricate a multifunctional interlayer for stabilizing Li metal anodes.
- To suppress Li dendrite formation and improve the cycling performance of lithium metal batteries.
Main Methods:
- Fabrication of a 3D nanofiber framework incorporating Ag nanoparticles, amorphous SiO2, and TiO2 via electrospinning.
- Utilizing the structure as an interlayer between a separator and Li metal foil.
- Testing Li||Li symmetric batteries and full cells with the developed interlayer.
Main Results:
- The Ag@SiO2-TiO2 interlayer exhibited a flexible 3D structure that accommodates volume changes and promotes uniform Li+ distribution.
- The gradient lithiophilic structure effectively regulated Li+ flux and suppressed Li dendrite growth.
- Li||Li symmetric batteries achieved a 1500-hour lifespan, and full cells maintained 94.6% capacity after 1000 cycles.
Conclusions:
- The developed 3D lithiophilic gradient structure is effective in enhancing the stability and cycle life of Li metal anodes.
- This approach offers a promising strategy for designing advanced interlayers for high-performance rechargeable lithium batteries.
