期刊
CHEMICAL ENGINEERING JOURNAL
卷 428, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.131109
关键词
Lithium-sulfur batteries; Oxygen deficient; Catalytic activity; Separator; NiCo2O4-x
资金
- Changshu innovation and entrepreneurship leading talent project [CSRC1626]
- Suzhou innovation and entrepreneurship leading talent project [ZXL2018019]
- National Natural Science Foundation of China [11890702, 51721001]
- Jiangsu Province Prospective Joint Research on Pilot Project [BY2013072-03]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) - National Laboratory of Solid State Microstructures, Test Foundation of Nanjing University
The application of lithium-sulfur batteries faces challenges due to low kinetics, but by designing a urchin-like structure of NiCo2O4 catalyst, the conversion rate and efficiency of lithium polysulfides are improved, resulting in superior performance and longer lifespan of the battery.
Recently, lithium-sulfur batteries (LSBs) have been considered as the most potential energy storage system, but the application of LSBs is still confronted with significant challenges. One among the significant challenges is the low kinetics. In this work, we design the urchin-like structure of NiCo2O4 to expose more catalytic sites to accelerate the lithium polysulfides (LiPSs) conversion. And the oxygen deficient in NiCo2O4 with spinel type structure (space group Fd3m) leads to the excellent chemical affinity of NiCo2O4-x for LiPSs. Moreover, because of the optimal distribution of electron on (311) plane of NiCo2O4-x, the Gibbs free energies of the evolution from S8 to Li2S on (311) plane of NiCo2O4-x is much lower than that of NiCo2O4, illustrating the NiCo2O4-x with the higher catalytic activity. Therefore, the cell with the NiCo2O4-x modified separator exhibits a superior rate performance (632 mAh g+1 at 2.5 C) and a long cycle life (404 mAh g+1 at 1 C after 800 cycles) with excellent Li+ ion diffusion coefficient. The rational structural optimization makes NiCo2O4-x become the efficient catalyst of LSBs. And the results promote the development of bimetallic oxides as catalyst in LSBs.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据