Luo Sainan, Lu Jiali, Qi Zixin, Ruan Jiafeng, Li Ziyue, Li Jiacheng, Yuan Tao, Pang Yuepeng, Zheng Shiyou
School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China.
Inorganic Chemistry I, Technische Universität Dresden, Dresden 01069, Germany..
J Colloid Interface Sci. 2026 Jan;701:138691. doi: 10.1016/j.jcis.2025.138691. Epub 2025 Aug 11.
Lithium-sulfur (LiS) batteries offer high theoretical energy density and low material cost, yet their practical application is limited by poor conductivity, sluggish redox kinetics, and the polysulfide shuttle effect. A promising strategy to overcome these challenges involves the rational design of carbon-supported metal catalysts with high conductivity, strong polysulfide adsorption, and abundant accessible active sites to enhance reaction kinetics. Herein, we report a dual‑carbon-constrained cobalt selenide (CoSe) nanocatalyst, derived from a metal-organic framework, as an efficient sulfur host. The hierarchical three-dimensional conductive network-comprising ultrathin carbon nanosheets and in-situ grown carbon nanotubes-facilitates rapid electron and ion transport while providing numerous active sites. Uniformly dispersed CoSe nanoparticles act as bifunctional adsorption-catalysis centers, promoting polysulfide conversion and effectively suppressing the shuttle effect. As a result, the cathode achieves a high specific capacity of 1385.7 mAh g at 0.2 A g, maintains 728.5 mAh g at 5 A g, and demonstrates excellent long-term cycling stability. This study presents a viable design approach for carbon-supported metal catalysts, offering a pathway toward the advancement of LiS battery technology.
锂硫（LiS）电池具有高理论能量密度和低材料成本，但其实际应用受到导电性差、氧化还原动力学迟缓以及多硫化物穿梭效应的限制。一种克服这些挑战的有前景的策略涉及合理设计具有高导电性、强多硫化物吸附能力和丰富可及活性位点的碳负载金属催化剂，以增强反应动力学。在此，我们报道了一种源自金属有机框架的双碳约束硒化钴（CoSe）纳米催化剂，作为一种高效的硫载体。由超薄碳纳米片和原位生长的碳纳米管组成的分级三维导电网络促进了快速的电子和离子传输，同时提供了大量活性位点。均匀分散的CoSe纳米颗粒充当双功能吸附催化中心，促进多硫化物转化并有效抑制穿梭效应。结果，该阴极在0.2 A g下实现了1385.7 mAh g的高比容量，在5 A g下保持728.5 mAh g，并展现出优异的长期循环稳定性。本研究提出了一种可行的碳负载金属催化剂设计方法，为锂硫电池技术的进步提供了一条途径。
