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Synergistically Coupling Atomic-Level Defect-Manipulation and Nanoscopic-Level Interfacial Engineering Enables Fast
Wenxi Zhao1,2, Xiaoqing Ma1, Xiaodeng Wang3
1School of Electronic Information Engineering, Yangtze Normal University, Fuling, Chongqing, 408100, China.
Small (Weinheim an Der Bergstrasse, Germany)
|January 31, 2024
Summary
This study introduces a novel 3D anode material (ANDC@SnSSe@C) for sodium-ion batteries, demonstrating excellent capacity, long cycle life, and rate capability by incorporating selenium ligands and carbon encapsulation to enhance performance.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Transition metal chalcogenides (TMCs) show promise for batteries but require structural optimization.
- Atomic-level defect manipulation and nanoscopic architecture design are key to enhancing TMC performance.
Purpose of the Study:
- To develop a novel anode material for high-efficiency sodium-ion batteries.
- To investigate the impact of anionic ligands and carbon encapsulation on material properties and electrochemical performance.
Main Methods:
- Synthesis of a 3D biconcave hollow-tyre-like anode (ANDC@SnSSe@C) using Aspergillus niger spores.
- Experimental investigations including electrochemical testing and ex situ characterizations.
- Theoretical analyses to understand defect-induced properties and ion migration.
Main Results:
- The ANDC@SnSSe@C anode exhibits abundant structural defects and Na+ reactivity sites due to selenium ligands and carbon encapsulation.
- The material shows enhanced ion migration, wider interlayer spacing, and mitigated volume expansion.
- Exceptional reversible capacity, 83.4% capacity retention over 2000 cycles at 20.0 A g-1, and excellent rate capability were achieved.
Conclusions:
- The developed ANDC@SnSSe@C anode effectively resolves critical issues in sodium-ion battery charge-discharge processes.
- The material demonstrates significant potential for high-performance sodium-ion batteries and hybrid capacitors.
- The study highlights the importance of defect engineering and architectural design in advanced energy storage materials.
