Periodic Reporting for period 1 - NEW MONO 2D FUN GER (Atomically thin pristine germanane with diverse chemical functionalities for energy storage: sodium/lithium ion batteries)
Période du rapport: 2022-09-01 au 2024-08-31
The main goal of this project was to investigate the electrochemical performance of functionalized germanane-carbon composites in sodium-ion batteries (SIBs), complemented by select studies in lithium-ion batteries (LIBs), to understand their structure-property relationships. Initially, the focus was on modifying surface chemistry using carbon materials and exploring their impact on the electronic properties. As the project progressed, the emphasis shifted toward synthesizing and evaluating novel 2D monoelemental materials, specifically silicane (SiH) and germanane (GeH), through a scalable and cost-effective process.
We successfully synthesized innovative 2D SiH and GeH materials with various compositions (Si0.25Ge0.75H Si0.50Ge0.50H and Si0.75Ge0.25H) via chemical exfoliation of their Zintl phases. These materials displayed large surface areas, high mechanical flexibility, and fast electron mobility, positioning them as promising candidates for energy storage applications. Among the tested compositions, the Si0.50Ge0.50H electrode delivered the best performance, achieving a discharge capacity of 1059 mAh g−1 after 60 cycles at a current density of 75 mA g−1.
To further understand the lithiation/delithiation mechanisms, we performed ex-situ electrochemical analysis on the Si0.50Ge0.50H material. The study provided key insights into the c-Li15(SixGe1-x)4 phase after lithiation and the a-Si0.50Ge0.50 phase after delithiation, offering new perspectives on the (de)lithiation processes in germanane-silicane alloys. These findings deepen our understanding of their electrochemical behavior and open up opportunities for future research.
Overall, this project made significant advancements in synthesizing and characterizing germanane-based materials and highlighted their potential in energy storage applications, particularly for use in rechargeable batteries. These breakthroughs lay the groundwork for further exploration and application of 2D materials in next-generation battery technologies.
We successfully synthesized innovative 2D SiH and GeH materials with various compositions (Si0.25Ge0.75H Si0.50Ge0.50H and Si0.75Ge0.25H) via chemical exfoliation of their Zintl phases. These materials displayed large surface areas, high mechanical flexibility, and fast electron mobility, positioning them as promising candidates for energy storage applications. Among the tested compositions, the Si0.50Ge0.50H electrode delivered the best performance, achieving a discharge capacity of 1059 mAh g−1 after 60 cycles at a current density of 75 mA g−1.
To further understand the lithiation/delithiation mechanisms, we performed ex-situ electrochemical analysis on the Si0.50Ge0.50H material. The study provided key insights into the c-Li15(SixGe1-x)4 phase after lithiation and the a-Si0.50Ge0.50 phase after delithiation, offering new perspectives on the (de)lithiation processes in germanane-silicane alloys. These findings deepen our understanding of their electrochemical behavior and open up opportunities for future research.
Overall, this project made significant advancements in synthesizing and characterizing germanane-based materials and highlighted their potential in energy storage applications, particularly for use in rechargeable batteries. These breakthroughs lay the groundwork for further exploration and application of 2D materials in next-generation battery technologies.
Introduction:
The project focused on exploring the electrochemical performance of 2D materials, specifically silicane (SiH) and germanane (GeH) with tunable compositions, in lithium-ion batteries and sodium-ion batteries.
Work Performed:
We synthesized 2D SiH and GeH materials through chemical exfoliation of Zintl phases and tested their electrochemical properties. Extensive structural and electrochemical analyses were conducted to optimize the materials for battery applications. Ex-situ electrochemical analyses were also performed to investigate the lithiation/delithiation mechanisms.
Main Achievements:
The Si0.50Ge0.50H composition demonstrated the highest performance, with a discharge capacity of 1059 mAh g−1 after 60 cycles at a current density of 75 mA g−1. These findings indicate a significant advancement in using 2D germanane-silicane alloy materials for high-performance energy storage.
Outcomes:
The project successfully advanced the understanding of 2D material applications in rechargeable batteries and identified Si0.50Ge0.50H as a promising candidate for future battery development.
The project focused on exploring the electrochemical performance of 2D materials, specifically silicane (SiH) and germanane (GeH) with tunable compositions, in lithium-ion batteries and sodium-ion batteries.
Work Performed:
We synthesized 2D SiH and GeH materials through chemical exfoliation of Zintl phases and tested their electrochemical properties. Extensive structural and electrochemical analyses were conducted to optimize the materials for battery applications. Ex-situ electrochemical analyses were also performed to investigate the lithiation/delithiation mechanisms.
Main Achievements:
The Si0.50Ge0.50H composition demonstrated the highest performance, with a discharge capacity of 1059 mAh g−1 after 60 cycles at a current density of 75 mA g−1. These findings indicate a significant advancement in using 2D germanane-silicane alloy materials for high-performance energy storage.
Outcomes:
The project successfully advanced the understanding of 2D material applications in rechargeable batteries and identified Si0.50Ge0.50H as a promising candidate for future battery development.
The project delivered results that significantly exceeded the current state of the art in lithium-ion batteries. While existing battery materials struggle with limited capacity and stability, the newly developed 2D materials (silicane and germanane composites) demonstrated exceptional electrochemical performance, including a discharge capacity of 1059 mAh g−1 after 60 cycles, substantially higher than traditional graphite materials.
In addition, our research unveiled a previously unknown phase transition mechanism during the (de)lithiation process, offering a deeper understanding of the material’s behavior at the atomic level. This discovery paves the way for improved energy storage technologies by enabling more efficient charge-discharge cycles, significantly advancing the science behind next-generation batteries.
To unlock the full commercial potential of these findings, further research is needed to optimize material synthesis for large-scale production. Collaboration with industry partners and access to funding for demonstration projects will be essential to advance these innovations from the lab to the market.
In addition, our research unveiled a previously unknown phase transition mechanism during the (de)lithiation process, offering a deeper understanding of the material’s behavior at the atomic level. This discovery paves the way for improved energy storage technologies by enabling more efficient charge-discharge cycles, significantly advancing the science behind next-generation batteries.
To unlock the full commercial potential of these findings, further research is needed to optimize material synthesis for large-scale production. Collaboration with industry partners and access to funding for demonstration projects will be essential to advance these innovations from the lab to the market.