5 years ago

Systematic Study of Effect on Enhancing Specific Capacity and Electrochemical Behaviors of Lithium–Sulfur Batteries

Systematic Study of Effect on Enhancing Specific Capacity and Electrochemical Behaviors of Lithium–Sulfur Batteries
Shenglin Xiong, Aihua Yuan, Junhao Zhang, Kan Mi, Baojuan Xi, Man Huang
Herein, a flexible method is designed to engineer nitrogen-doped carbon materials (NC) with different functional and structural specialties involving N-doping level, graphitization, and surface area via tuning the carbonization temperature of the pre-prepared zeolitic imidazolate framework-8 (ZIF-8 ) crystals. With the aim to unveil the effect of these features on the electrochemical performance of sulfur cathode, these samples are evaluated as sulfur host and comprehensively investigated. NC-800 (800 °C, 10.45%N, 1032.4 m2 g−1) exhibits the best electrochemical capability comparing with NC-700 (700 °C, 16.59%N, 891.4 m2 g−1) and NC-900 (900 °C, 7.59%N, 987.6 m2 g−1). High surface area and N-doping can work together to well increase the capacity of sulfur cathode, thanks to the improved transportation of charge carriers and effective anchoring of active sulfur, while the latter specialty just makes sulfur cathode have decent capacity in case of low surface area. Graphitization and quaternary nitrogen favorably improve the electric conductivity of the electrode, empowering the improvement of discharge capacity initially and rendering the good cyclability cooperatively relying on the effective immobilization of active materials. The related results suggest the significance of rational design of carbon maxtrix for sulfur to improve the performance of Li-S batteries. In Li–S batteries, the specific capacity and the electrochemical behaviors are adequately enhanced by the interaction of functional and structural specialties into carbon matrix involving heteroatom doping, graphitization, and surface area, guiding the design of advanced host materials toward high-performance Li–S batteries.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/aenm.201701330

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