Neurons-system-like structured SnS2/CNTs composite for high-performance sodium-ion battery anode

• 作者: Ling Zhu Xue-Xian Yang Yan-Hong Xiang Peng Kong Xian-Wen Wu
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: MICRO/NANOSTRUCTURED ELECTRODE MATERIALS FOR ELECTROCATALYSIS AND BATTERY
• 页码范围: 1383-1390
• 页数: 8页
• 语种: 英文

摘要

Sodium-ion batteries (SIBs) have attracted sig-nificant attention with respect to renewable energy power generation systems because of the abundant reserves of sodium on earth.However,anode materials are presently limited by low energy density,poor rate performance and inferior cycling stability.In recent years,tin disulfide(SnS2) with a particular layered structure has been con-sidered as a promising anode material for SIBs due to its high theoretical capacity and low cost.Herein,a nervous-system-like structured SnS2/CNTs composite was suc-cessfully synthesized via a hydrothermal method.The SnS2 sheets were strung with carbon nanotubes (CNTs) to form a hierarchical porous structure,which is effective for elec-trolyte diffusion and electronic transmission.The large distance of the (001) plane (0.5899 nm) of SnS2 favors Na+ insertion-extraction dynamics.Benefitting from these structural characteristics,SnS2/CNTs electrodes exhibit high specific capacity,excellent rate performance and superior cycling stability.A high charge capacity of 642 mAh·g-1 was released at 0.2 A·g-1,and then,a high reversible capacity of 427 mAh·g-1 was retained after 100 cycles.Even charged at 2 A·g-1,the SnS2/CNTs electrode maintained a capacity of 282 mAh·g-1.The nervous-sys-tem-like structure of the SnS2/CNTs composite provides a novel strategy for the development of SIBs with high electrochemical performance.