Design And Synthesis Of Bimetal-Organic Frameworks For Li-ion Batteries

Energy conversion and storage are a major global challenge due to issues associated with fossil fuels,such as pollution and non-sustainability.Energy storage devices are needed to store renewable energy.Li-ion batteries are promising electrochemical systems for these applications.Metal-organic frameworks（MOFs）are a type of crystalline materals with tunable pore diameter and high surface area,which stemed from the coordinating of metal centers/clusters and multidentate organic linkers.Pristine MOFs have been exploited as alternatives to conventional graphite anode materials.Recently,bi-metal-oxides have received enormous attention by its higher electronic conductivity than single-metal-oxides.In addition,metal sulfides have been reported as promising LIBs anode candidates.However,they suffer from some drawbacks,such as poor kinetics and dissolution of polysulfides in the electrolyte.By anchoring sulfur active site in MOFs may effectively control the loss of sulfur.Thus,the exploitation of S-doped bimetalic MOFs for LIBs anode materials is very important.Three novel isomorphic chiral bimetalic MOFs have been synthesized.These MOFs are used as anode materials in LIBs.We studied the relation beween the LIBs performance and bimetalic MOFs containing different metal component.[(FeCo_0.5O₂)(C₁₅O₈H₇)]·8DMF（1）[(FeNi_0.5O₂)(C₁₅O₈H₇)]·8DMF（2）[(FeCo_0.5O₂)(C₁₅O₈H₇)]·8DMF（3）At the same time,a novel S-doped bimetalic MOF has been synthesized.The capacity retention rate of S-doped bimetalic MOF are excellent,which indicates the success of this kind of strategy.[（Fe₂Co）（C₆SO₄H₂）3]·（C₃NO）3（4）...