Li Jiahao, Gao Bo, Shi Zeyuan, Chen Jiayang, Fu Haiyang, Liu Zhuang
Key Laboratory for Ecological Metallurgy of Multimetallic Mineral, Ministry of Education, Northeastern University, Shenyang 110819, China.
Materials (Basel). 2023 Jul 12;16(14):4956. doi: 10.3390/ma16144956.
An interlayer nanocomposite (CC@rGO) consisting of a graphene heterojunction with CoO and CoS was prepared using a simple and low-cost hydrothermal calcination method, which was tested as a cathode sulfur carrier for lithium-sulfur batteries. The CC@rGO composite comprises a spherical heterostructure uniformly distributed between graphene sheet layers, preventing stacking the graphene sheet layer. After the introduction of cobalt heterojunction on a graphene substrate, the Co element content increases the reactive sites of the composite and improves its electrochemical properties to some extent. The composite exhibited good cycling performance with an initial discharge capacity of 847.51 mAh/g at 0.5 C and a capacity decay rate of 0.0448% after 500 cycles, which also kept 452.91 mAh/g at 1 C and in the rate test from 3 C back to 0.1 C maintained 993.27 mAh/g. This article provides insight into the design of cathode materials for lithium-sulfur batteries.
采用简单低成本的水热煅烧法制备了一种由氧化钴和硫化钴的石墨烯异质结组成的层间纳米复合材料（CC@rGO），并将其作为锂硫电池的正极硫载体进行了测试。CC@rGO复合材料包含均匀分布在石墨烯片层之间的球形异质结构，可防止石墨烯片层堆叠。在石墨烯基底上引入钴异质结后，Co元素含量增加了复合材料的反应位点，并在一定程度上改善了其电化学性能。该复合材料表现出良好的循环性能，在0.5 C下初始放电容量为847.51 mAh/g，500次循环后容量衰减率为0.0448%，在1 C下也保持452.91 mAh/g，在从3 C回到0.1 C的倍率测试中保持993.27 mAh/g。本文为锂硫电池正极材料的设计提供了思路。
