MOF Surface Method For The Ultrafast And One-step Generation Of Metal-oxide-NP@MOF Composites As Lithium Storage Materials

NP@MOF composites have be seen as the lithium ion battery materials,greatly improving the electrochemical performance of lithium ion battery test in recent years,gradually becoming a rising"star material"in the field of electrochemical.However,the method of preparation of NP@MOF composites is primitive,such as grinding,solution osmosis,chemical vapor deposition?CVD?and so on,these steps are trival,harsh conditions,high cost,not suitable for mass production.Thus,to establish a fast approach to prepare NP@MOF composite materials is urgent need.This paper intends to carry out a kind of role sites on the surface of the MOF,which is a new type,efficient and fast?even one step method?method of the preparation of NP@MOF nanocomposite and its performance research.It uses MOFs as substrates,in a special"phenol-Fe?III?"as the theoretical basis of the chemical reaction,loading Fe₂O₃to MOFs surface in the form of nano film and getting strong framework through deep hydrolysis reaction.Finally,we get Fe₂O₃@MOF nanocomposites,which has rules of porosity,high specific surface area,good electric properties.And then,we adopt five materials of the phenol MOFs,to explore whether the phenol to protons or not,whether phenol in the presence of holes or not,how much the phenol on the relationship between the content of loading Fe₂O₃ nanoparticles and affect the performance of lithium-ion batteries.This thesis is mainly composed of five parts.?1?We select 2,5-dihydroxy terephthalic acid as oxygen ligand,select divalent metal zinc ions as the center,to get MOF-74 through solvent thermal.And then we adopt a way of“the phenol-Fe?III?”reaction and the depth of the hydrolysis to get Fe₂O₃@MOF-74nanocomposites.Finally,we assemble lithium ion batteries,and to get electrochemical tests.?2?We select 2,5-dihydroxy terephthalic acid as oxygen ligand,select divalent metal zinc ions as the center,to get UTSA-74 through solvent thermal.And then we adopt a way of“the phenol-Fe?III?”reaction and the depth of the hydrolysis to get Fe₂O₃@UTSA-74 nanocomposites.Finally,we assemble lithium ion batteries,and to get electrochemical tests.?3?We select 2,5-dihydroxy terephthalic acid as oxygen ligand,select bivalent magnesium ions as the center,to get Mg?DHT??DMF?₂ through solvent thermal.And then we adopt a way of“the phenol-Fe?III?”reaction and the depth of the hydrolysis to get Fe₂O₃@Mg?DHT??DMF?₂ nanocomposites.Finally,we assemble lithium ion batteries,and to get electrochemical tests.?4?We select 2,5-dihydroxy terephthalic acid as oxygen ligand,select tetravalent zirconium ion as the center,to get UIO-66-?OH?₂ through solvent thermal.And then we adopt a way of“the phenol-Fe?III?”reaction and the depth of the hydrolysis to get Fe₂O₃@UIO-66-?OH?₂ nanocomposites.Finally,we assemble lithium ion batteries,and to get electrochemical tests.?5?We select 2-hydroxy terephthalic acid as oxygen ligand,select tetravalent zirconium ion as the center,to get UIO-66-?OH?through solvent thermal.And then we adopt a way of“the phenol-Fe?III?”reaction and the depth of the hydrolysis to get Fe₂O₃@UIO-66-?OH?nanocomposites.Finally,we assemble lithium ion batteries,and to get electrochemical tests.