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Scalable fabrication of ultra-fine lithiophilic nanoparticles encapsulated in soft buffered hosts for long-life anode-free Li 2 S-based cells.
- Source :
-
Nanoscale [Nanoscale] 2023 Sep 29; Vol. 15 (37), pp. 15318-15327. Date of Electronic Publication: 2023 Sep 29. - Publication Year :
- 2023
-
Abstract
- Minimizing the amount of metallic lithium (Li) to zero excess to achieve an anode-free configuration can help achieve safer, higher energy density, and more economical Li metal batteries. Nevertheless, removal of excess Li creates challenges for long-term cycling performance in Li metal batteries due to the lithiophobic copper foils as anodic current collectors. Here, we improve the long-term cycling performance of anode-free Li metal batteries by modifying the anode-free configuration. Specifically, a lithiophilic Au nanoparticle-anchored reduced graphene oxide (Au/rGO) film is used as an anodic modifier to reduce the Li nucleation overpotential and inhibit dendrite growth by forming a lithiophilic Li <subscript> x </subscript> Au alloy and solid solution, which is convincingly evidenced by density functional theory calculations and experimentally. Meanwhile, the flexible rGO film can also act as a buffer layer to endure the volume expansion during repeated Li plating/stripping processes. In addition, the Au/rGO film promotes a homogeneous distribution of the electric field over the entire anodic surface, thus ensuring a uniform deposition of Li during the electrodeposition process, which is convincingly evidenced by finite element simulations. As expected, the Li||Au/rGO-Li half-cell shows a highly stable long-term cycling performance for at least 500 cycles at 0.5 mA cm <superscript>-2</superscript> and 0.5 mA h cm <superscript>-2</superscript> . A Li <subscript>2</subscript> S-based anode-free full cell allows achieving a stable operation life of up to 200 cycles with a capacity retention of 63.3%. This work provides a simple and scalable fabrication method to achieve anode-free Li <subscript>2</subscript> S-based cells with high anodic interface stability and a long lifetime.
Details
- Language :
- English
- ISSN :
- 2040-3372
- Volume :
- 15
- Issue :
- 37
- Database :
- MEDLINE
- Journal :
- Nanoscale
- Publication Type :
- Academic Journal
- Accession number :
- 37682066
- Full Text :
- https://doi.org/10.1039/d3nr03035k