Three-dimensional porous FeS@N doped carbon nanosheets for high-rate and high-stable sodium/potassium storage

作者：Yuan, Jujun; Mu, Meiqi; Xu, Xijun^*; Gan, Yunfei; He, Haishan; Zhang, Xianke; Li, Xiaokang^*; Kuang, Fanguang; Li, Haixia; Liu, Jun^*

来源：Composites Part B: Engineering , 2022, 247: 110300.

DOI：10.1016/j.compositesb.2022.110300

• Anode material
• 3D FeS@NC nanosheets
• Sodium ion battery
• Potassium ion battery
• High capacity

The three-dimensional (3D) FeS@N doped Carbon (NC) nanosheets are successfully synthesized using a simple sol-gel method followed by a solid sulfidation process. As SIBs anode, the 3D FeS@NC nanosheets exhibit a maintainable capacity (254 mAh g-1 at 1.5 A g-1 upon 1100 cycles) and outstanding rate behaviour. As PIBs anode, the 3D FeS@NC nanosheets also exhibit a maintainable capacity (120 mAh g-1 at 1 A g-1 upon 1100 cycles) and outstanding rate behaviour. The excellent electrochemical performance can be attributed to the distinctive 3D porous FeS@NC nanosheets, which can inhibit the aggregation and pulverization of FeS, enhance electronic/ionic conductivity, firmly immobilize the dissolved polysulfides, and provide a larger contact area between active materials and electrolytes. Moreover, the N-doped carbon framework can also provide substantial active sites for Na+(K+) storage. Our synthesizing strategy can be potentially utilized for fabricating other 3D metal sulfide@C composites for SIB (PIB) anodes.

• 单位
  xk; 广东工业大学