Related Experiment Video
Updated: Jul 16, 2025
07:20
Screening of Coatings for an All-Solid-State Battery Using In Situ Transmission Electron Microscopy
Published on: January 20, 2023
2.6K
Synergy Between Surface Confinement and Heterointerfacial Regulations with Fast Electron/Ion Migration in InSe-PPy
Penglei Chen1,2, Xiangdong Pei3, Ruyi Liu4
1State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi, 830017, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|September 10, 2023
Summary
Layered indium selenide (InSe) nanoflakes coated with polypyrrole (PPy) demonstrate enhanced sodium-ion battery performance. This InSe@PPy composite offers superior capacity and stability by optimizing ion storage and reaction mechanisms.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Layered indium selenide (InSe) is a 2D semiconductor with promising properties like high carrier mobility and tunable bandgap.
- Limited research exists on InSe's ion storage behavior and electrochemical reaction mechanisms, hindering its application in energy storage.
Purpose of the Study:
- To design and synthesize InSe nanoflakes encapsulated in polypyrrole (InSe@PPy) for improved sodium-ion battery performance.
- To investigate the electrochemical reaction mechanism and ion storage behavior of the InSe@PPy composite.
- To enhance structural stability and conductivity for advanced energy storage applications.
Main Methods:
- In situ chemical oxidation polymerization to create InSe@PPy composite.
- Density functional theory (DFT) calculations to model heterostructure effects on electron transfer and ion diffusion.
- Electrochemical testing of sodium-ion batteries (cycling performance, rate capability).
- In situ X-ray diffraction (XRD), ex situ electrochemical impedance spectroscopy (EIS), and transmission electron microscopy (TEM) for mechanism investigation.
Main Results:
- The InSe@PPy composite exhibited high reversible capacity (336.4 mAh g⁻¹ after 500 cycles at 1 A g⁻¹) and excellent long-term stability (274.4 mAh g⁻¹ after 2800 cycles at 5 A g⁻¹).
- DFT calculations confirmed that the heterostructure enhances structural stability, electrical conductivity, and Na⁺ diffusion.
- Analysis revealed a combined reaction mechanism involving insertion, conversion, and alloying of InSe@PPy during cycling.
Conclusions:
- The InSe@PPy composite demonstrates significant potential as an anode material for high-performance sodium-ion batteries.
- Encapsulation in polypyrrole effectively mitigates volume changes and improves conductivity.
- Understanding the complex reaction mechanisms provides insights for designing next-generation 2D material-based energy storage systems.
