Zou Feng, Liu Kewei, Cheng Chung-Fu, Ji Yijie, Zhu Yu
Nanotechnology. 2020 Nov 27;31(48):485404. doi: 10.1088/1361-6528/abae9b.
Due to its high capacity (1675 mAh g), Li-S batteries have been considered as one of the ideal energy storage systems. The grand challenges of lithium-sulfur batteries are sulfur immobilization and improving electrical conductivity of cathode composite. The carbon-sulfur (C-S) composites and the polar materials (Ni(OH), TiO, MnO, TiS, CoS, etc) integration have been proven to be two of the most effective routes to achieving good Li-S battery performance. However, each strategy has drawbacks: the C-S composites have low volume density and the polar materials are often lack of electrical conductivity. Therefore, the hybridization of carbon and polar materials shall provide synergistic effects achieving ideal sulfur cathode. Herein, a hybrid material with carbon-coated NiS nanoparticles grown on graphene sheets was synthesized through a hydrothermal reaction followed by two steps of annealing. The obtained composite has a well-balanced ratio between graphene and NiS. An optimized energy density was demonstrated in lithium-sulfur cells.
由于其高容量（1675毫安克），锂硫电池被认为是理想的储能系统之一。锂硫电池面临的重大挑战是硫的固定和提高正极复合材料的电导率。碳硫（C-S）复合材料与极性材料（Ni(OH)、TiO、MnO、TiS、CoS等）的整合已被证明是实现良好锂硫电池性能的两种最有效途径。然而，每种策略都有缺点：C-S复合材料的体积密度低，极性材料往往缺乏导电性。因此，碳和极性材料的杂化应能产生协同效应，从而实现理想的硫正极。在此，通过水热反应并经过两步退火，合成了一种在石墨烯片上生长有碳包覆硫化镍纳米颗粒的混合材料。所获得的复合材料在石墨烯和硫化镍之间具有良好的平衡比例。在锂硫电池中展示了优化的能量密度。
