Mo2C-Co heterostructure with carbon nanosheets decorated carbon microtubules: Different means for high-performance lithium-sulfur batteries
Yating Cui, Siyu Ji, Yujie Zhu, Jingyu Xi
Abstract
The practical applications of lithium sulfur batteries (LSBs) are hindered by notorious shuttle effect and sluggish conversion kinetics of intermediate polysulfides . Herein, Mo 2 C-Co heterogeneous particles decorated two-dimensional (2D) carbon nanosheets grown on hollow carbon microtubes (CCC@MCC) are synthesized. Three-dimensional (3D) carbon framework with Mo 2 C-Co heterogeneous particles combines the conductivity, adsorption and catalysis, effectively trapping and accelerating the conversion of polysulfides . As evidenced experimentally, the hetero-structured Mo 2 C-Co with high Li + diffusion coefficient enables uniform precipitation and complete oxidation of Li 2 S. Meanwhile, CCC@MCC is found to have multiple application possibilities for lithium-sulfur batteries. As an interlayer, the cells deliver an excellent capacity of 881.1 mAh/g at 2C and still retain 438.2 mAh/g after 500 cycles under the low temperature of 0 ℃. As a sulfur carrier, the cell with a sulfur loading of 7.0 mg cm −2 exhibits a high area capacity of 5.3 mAh cm −2 . This work provides an effective strategy to prepare heterostructured material and imaginatively exploit the application potential of it.