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Microstructure Design of Metal Selenides for Sodium-Ion Battery Anodes
Jian Wang1, Zhaowei Sun1, Kaizhao Wang1
1Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China.
Small (Weinheim an Der Bergstrasse, Germany)
|September 2, 2025
Summary
Advanced microstructural engineering of metal selenides significantly enhances their performance as anodes for sodium-ion batteries (SIBs). Tailored designs overcome challenges like volume expansion and poor conductivity, enabling stable, high-capacity energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Sodium-ion batteries (SIBs) are crucial for next-generation energy storage.
- Metal selenides show promise as SIB anodes due to high theoretical capacities.
- Challenges include volume expansion, poor conductivity, and structural instability.
Purpose of the Study:
- To review microstructural engineering strategies for metal selenide anodes in SIBs.
- To discuss how these strategies address inherent material limitations.
- To highlight advancements in performance and stability.
Main Methods:
- Microstructural engineering: micro-morphology design (0D-3D, hierarchical), heteroatom doping, defect engineering (vacancies, grain boundaries), heterostructure engineering.
- Analysis of fundamental principles, synthesis methods, and impact on electronic structure and ion diffusion.
- Critical discussion of synergistic effects on electrochemical performance.
Main Results:
- Engineered microstructures effectively mitigate volume expansion and improve conductivity.
- Tailored designs enhance specific capacity, rate capability, and cycling stability.
- Strategies modulate electronic structure, ion diffusion, active sites, and mechanical integrity.
Conclusions:
- Microstructural engineering is key to unlocking the potential of metal selenide anodes for SIBs.
- Optimized designs lead to high-performance, stable, and practical anode materials.
- Future research should focus on innovative design paradigms for advanced SIBs.
