High-Loading Lithium–Sulfur Batteries with MnO2 Coated Carbon Microspheres
Author Information
Author(s): Dai Liqin, Yi Zonglin, Xie Lijing, Su Fangyuan, Guo Xiaoqian, Wang Zhenbing, Cheng Jiayao, Chen Chengmeng
Primary Institution: Shanxi Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences
Hypothesis
Can the in situ growth of MnO2 nanosheets on carbon microspheres improve the performance of lithium-sulfur batteries?
Conclusion
The HPCs/S@MnO2 composite cathode exhibits excellent electrochemical performance with high sulfur loading and stable cycling stability.
Supporting Evidence
- The HPCs/S@MnO2 electrode with 7 mg cm−2 sulfur loading shows a low-capacity decay rate of 0.063% per cycle after 200 cycles.
- The composite exhibits enhanced rate capability up to 5 C at sulfur loading of 4.0 mg cm−2.
- A Li–S pouch cell with a capacity of 2.5 Ah demonstrates high cycling stability.
- The design effectively suppresses the polysulfide shuttle effect and improves sulfur utilization.
Takeaway
This study shows that adding a special layer of MnO2 to carbon microspheres helps lithium-sulfur batteries hold more sulfur and work better for a longer time.
Methodology
The study involved synthesizing HPCs/S@MnO2 composites and evaluating their electrochemical performance in lithium-sulfur batteries.
Limitations
The study does not address the long-term stability of the MnO2 layer under various operational conditions.
Digital Object Identifier (DOI)
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