Thermal Modulation of MOF and Its Application in Lithium–Sulfur Batteries

• DOI: 10.1021/acsami.9b16337
• Publication Date: 2019-11-19T16:33:10Z
• Authors: Jing Han; Shu Gao; Ruxing Wang; Kangli Wang; Mao Jiang; Jie Yan; Kai Jiang
• Keywords: Modulation (music); Lithium–sulfur battery

The applications of metal-organic frameworks (MOFs) as sulfur hosts focus on pristine MOFs and their carbonization products for establishing high-performance lithium-sulfur batteries (LSBs). However, the mechanism that modulates specific nanostructures compositions at different treatment temperatures still needs further exploration. In this work, we modulate pyrolysis UiO-66-NH2@rGO (U@rGO) a predetermined temperature by thermogravimetric (TG) analysis systematically investigate microstructure chemical characteristic evolution. composite processed 300 °C (U@rGO-P300) results in rearrangement an octahedral nanophase into amorphous material while retaining large number functional groups -NH2 COO-, which lead to additional nanostructure interface high Brunauer-Emmett-Teller (BET) surface area 298.4 m2 g-1. Moreover, newly created abundant suboxidative Zr3+ atom sites serve polysulfide anchor transfer mediator active sites. assembled LSBs could deliver capacity 906.1 retain 801.7 mA h g-1 after cycles 1C with low fading rate around 0.05% per cycle improved performance 619.1 4C. Li+ diffusion coefficients are significantly increased 10-60 times. This work provides simple route activate metal MOF category state, leading intriguing unanticipated properties.