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Three-dimensional micro-nanostructures based on binary transitional metal sulfides with doped carbon protector
Wei Bai1, Yanan Wei1, Zhirong Wang1
1Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control, College of Safety Science and Engineering, Nanjing Tech University, Nanjing 211816, China.
Journal of Colloid and Interface Science
|March 31, 2023
Summary
This study introduces a new tin sulfide/cobalt sulfide composite anode (SnS/Co9S8@HC) for safer, high-performance lithium-ion batteries. The material significantly enhances thermal stability and electrochemical capacity, addressing key battery limitations.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-ion batteries face limitations due to insufficient lithium-ion reservoirs and thermal runaway risks.
- Current materials like Li4Ti5O12 and TiO2 offer improved safety but sacrifice electrochemical performance due to low theoretical capacities.
Purpose of the Study:
- To design and evaluate a novel three-dimensional micro-nanostructure anode material for enhanced lithium-ion battery safety and performance.
- To investigate the electrochemical properties and thermal stability of the designed SnS/Co9S8@HC composite.
Main Methods:
- Synthesis of a three-dimensional micro-nanostructure composite of binary transitional metal sulfides (SnS/Co9S8) protected by doped carbon (HC).
- Electrochemical testing of the SnS/Co9S8@HC anode in lithium-ion cells, including capacity, coulombic efficiency, and cycling stability assessments.
- Thermal runaway analysis comparing the SnS/Co9S8@HC anode with a graphite anode using differential scanning calorimetry (DSC) or similar techniques.
Main Results:
- The SnS/Co9S8@HC anode demonstrated a high initial capacity of 1104.8 mAh g-1 at 0.1-1 A g-1 with 97.1% coulombic efficiency.
- Excellent cycling stability was observed, retaining 450.3 mAh g-1 after 1000 cycles with a low capacity decay rate of 0.033% per cycle.
- The SnS/Co9S8@HC anode significantly improved thermal safety, with a reduced maximum thermal runaway temperature of 473.5 ± 6.2°C compared to graphite.
- The material also showed potential as a sodium-ion battery anode, with an initial capacity of 631.7 mAh g-1 and low decay rate.
Conclusions:
- The developed SnS/Co9S8@HC composite offers a promising solution for superior electrochemical performance and enhanced thermal safety in lithium-ion batteries.
- The hierarchical structure and multi-phase composition contribute to the material's stability and efficiency.
- This work provides insights for designing advanced transitional metal sulfide-based materials for next-generation energy storage devices.
