Potassium-Sulfur Batteries: A New Member of Room-Temperature Rechargeable Metal-Sulfur Batteries

作者：Zhao, Qing; Hu, Yuxiang; Zhang, Kai; Chen, Jun^*

来源：Inorganic Chemistry, 2014, 53(17): 9000-9005.

DOI：10.1021/ic500919e

• CATHODE MATERIAL
• OXYGEN REDUCTION
• POROUS CARBON
• LITHIUM
• PERFORMANCE
• COMPOSITE
• CAPACITY
• NANOSTRUCTURES
• NANOPARTICLES
• ELECTROLYTES

We report room-temperature rechargeable potassium-sulfur (K-S) batteries using ordered mesoporous carbon (CMK-3)/sulfur and polyanilime (PANI) coated CMK3/sulfur composites as the cathode and metallic potassium as the anode. The electrochemical reaction mechanism was investigated by electrochemical tests, TEM, XRD, and Raman spectra. It was found that K-S batteries delivered two reduction peaks located at about 2.1 and 1.8 V and one oxidation peak at about 2.2 V, respectively. Meanwhile, K2S3 was the major discharge product that could be charged to reversibly form S and K ion. Through optimization of sulfur content, the CMK-3/sulfur composite with 40.8 wt % S displayed an initial discharge capacity of 512.7 mAh g(-1) and a capacity of 202.3 mAh g(-1) after 50 cycles at a current density of 50 mA g(-1). A coating of conductive polyanilime (PANI) on the CMK-3/sulfur composite is effective in enhancing the cycling performance. In comparison, PANI@CMK-3/sulfur composite showed a capacity of 329.3 mAh g(-1) after 50 cycles at 50 mA g(-1). The results shed light on the basic study of rechargeable K-S batteries.

• 出版日期2014-9-1
• 单位南开大学