Related Experiment Video
Updated: Jun 6, 2025
10:58
Focused Ion Beam Fabrication of LiPON-based Solid-state Lithium-ion Nanobatteries for In Situ Testing
Published on: March 7, 2018
10.1K
In Situ Welding Ionic Conductive Breakpoints for Highly Reversible All-Solid-State Lithium-Sulfur Batteries
Zhonghao Hu1,2, Chuannan Geng1,2, Jiwei Shi2,3
1Shenzhen Geim Graphene Center, Shenzhen Key Laboratory for Graphene-based Materials, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China.
Journal of the American Chemical Society
|November 29, 2024
Summary
Researchers developed an in situ welding strategy using phosphorus pentasulfide (P2S5) to enhance solid-state lithium-sulfur batteries (SSLSBs). This method improves ionic conductivity and catalytic activity, boosting battery performance and energy density.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Poly(ethylene oxide) (PEO)-based solid-state lithium-sulfur batteries (SSLSBs) offer high energy density and safety.
- Dissolved lithium polysulfides (LiPS) and slow kinetics impede electrolyte networks, causing ionic conductive breakpoints and limiting performance.
Purpose of the Study:
- To address ionic conductive breakpoints and sluggish kinetics in PEO-based SSLSBs.
- To introduce an in situ welding strategy using phosphorus pentasulfide (P2S5) as a filler in solid cathodes.
Main Methods:
- In situ welding strategy using P2S5 as a filler in PEO-based solid cathodes.
- Investigating the reaction of P2S5 with LiPS to form lithium polysulfidophosphate (LSPS).
- Analyzing the catalytic effect of LSPS on sulfur redox reactions and its impact on the ionic conductive network.
Main Results:
- P2S5 reacts with LiPS to form ion-conducting LSPS, which welds ionic conductive network breakpoints and suppresses PEO interaction.
- LSPS catalyzes sulfur redox reactions, lowering activation energy from 0.87 to 0.75 eV and mitigating the shuttle effect.
- The assembled SSLSB achieved exceptional cycling stability and a high energy density of 358 Wh·kg-1 due to high sulfur utilization.
Conclusions:
- The in situ welding strategy effectively resolves ionic conductive breakpoints in PEO-based SSLSBs.
- LSPS formation enhances ionic conductivity and catalyzes sulfur redox reactions, improving battery performance.
- This approach offers a promising pathway for developing high-performance SSLSBs.
