The growing demand for portable electronic devices, electric vehicles, and large smart grids has driven the rapid development of energy storage technologies. Due to its high theoretical specific capacity, abundant natural reserves, low cost, and environmental friendliness, sulfur is considered to be a promising next-generation energy storage system. However, the poor conductivity of sulfur, the shuttle effect of polysulfides, and the volume expansion during charge and discharge cycles still restrict the commercialization process of lithium-sulfur batteries. Hollow doped carbon materials can relieve volume expansion due to large cavities, and heteroatom doping can increase the binding capacity of polysulfides, achieving high specific capacity and long cycle life of lithium-sulfur batteries. However, most of the hollow carbon materials are isolated, which increases the interface resistance of the material, and the looseness of the stack also reduces the volumetric energy density of the battery. The development of interconnected hollow-structure heteroatom-doped carbon materials as sulfur host materials is of great significance for improving the performance of lithium-sulfur batteries.
With the support of the National Natural Science Foundation of China (21471151, 21673241) and the Strategic Leading Science and Technology Project of the Chinese Academy of Sciences (XDB20030200), the research team of Wang Ruihu, State Key Laboratory of Structural Chemistry, Fujian Institute of Material Structure, Chinese Academy of Sciences used ZIF 8 The core-shell structure (ZIF-) is used as a precursor, and the dicyandiamide ion (DCA) is introduced using an anion exchange strategy. The core-shell structure is decomposed and cross-linked by high-temperature carbonization, and a type of interconnected hollow nitrogen doping is successfully prepared. Hybrid porous carbon material (HNPC). This structure can reduce the interface resistance of the material, enhance the adsorption capacity of polysulfide, and improve the utilization rate of the active material, so that the battery can still reach 562 mA h g after 800 cycles of stable cycling at a rate of 8 @ ImIP2 C The specific capacity of -1, the electrochemical performance is significantly better than traditional heteroatom-doped carbon materials. The above research work was published in "Advanced Functional Materials" (Adv. Funct. Mater. 2019, 29, 1902322. DOI: 10.1002 / adfm.201902322). The first author of the article is Li Zhonglin.
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