多硫化物
材料科学
异质结
电解质
聚丙烯腈
阴极
硫黄
化学工程
电化学
锂(药物)
阳极
电极
复合材料
光电子学
化学
聚合物
冶金
内分泌学
物理化学
工程类
医学
作者
Luqiao Jin,Huazhong Liu,Shouyu Hong,Jia Li,Jianxin Cai,Zhenyu Yang,Ze Zhang,Ji Yu
标识
DOI:10.1021/acs.jpcc.3c07313
摘要
Heterojunction structures as an advanced strategy may promote the synergistic effect of different component materials; the rational design of heterojunctions allows them to exhibit various advantages when applied to lithium–sulfur batteries. Hollow CoSn(OH)6 was used as a precursor, and polyacrylonitrile PAN and sulfur powder were used as raw materials. N-doped carbon nanofiber-encapsulated CoS2/SnS2 heterostructured materials CoS2/SnS2@CNFs were prepared by an electrostatic spinning technique and in situ vulcanization and applied to the lithium–sulfur battery cathode. A hollow cubic material with structural stability and a physical domain-limiting effect, that is, the CoS2/SnS2 heterostructure, was effectively constructed, and rapid charge transfer was realized by a built-in electric field induced to form by the heterogeneous interface. Meanwhile, the fiber-like network structure facilitates the wetting of the electrolyte and shortens the ion transfer path. The results show that a CoS2/SnS2@CNFs@S-based battery exhibits an excellent electrochemical performance. The initial discharge specific capacities were 1204.3 mAh g–1 at a current density of 0.1 C and 615.2 mAh g–1 at 4 C. The long-cycle performance showed that the cells only exhibited an ultralow decay rate of 0.067% per week on average after 1000 cycles at 2C. When the sulfur loading was increased to 5.3 mg cm–2 and the electrolyte/sulfur ratio was 6 μL mg–1, excellent cycling stability was still demonstrated after 250 weeks of cycling at 0.2C.
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