Cobalt-manganese Pyridine Carboxylic Acid And Cobalt-iron Metal Organic Framework Derived Materials And Energy Storage Research

Binary metal oxide with high theoretical specific capacity is attracting more attentions as anode materials for high performance lithium-ion batteries.Nevertheless,the large volume changes during cycles greatly hamper the actual application of anode materials in lithium-ion batteries.Herein,the new CoFe metal organic framework(CoFe-MOF)and Co Mn metal organic framework(Co Mn-MOF)with ligands of 3,5-Pyridinedicarboxylic acid(H₂pdc)and 1,10-Phenanthroline(Phen)were synthesized using a simplistic one-step hydrothermal approach.Add carbon by different ways to generate CoFe-MOF/C(1-4)bimetal MOF,then calcined in an inert atmosphere to obtained CoFe bimetal oxide(marked as HP-CoFe₂O₄/C(1-4))composite material and Co Mn bimetal oxide(marked as HP-Mn Co₂O₄/C)nanomaterial.The combination of activated carbon makes the performance more excellent,not only can improve the electronic conductivity,but also can buffer the volume change of the composite material during the lithiation/delithiation process.Electrochemical testing shows,compared with other carbon doping methods,HP-CoFe₂O₄/C-1 composite material has better electrochemical stability.When the current density is 200 m A g^-1,the first discharge specific capacity of the composite material can reach 984.5 m A h g^-1,and the reversible capacity of 451.9 m A h g^-1 can still be maintained after 100 cycles.When the current density of HP-Mn Co₂O₄/C nanomaterials is 200 m A g^-1,the first discharge specific capacity can reach 954.4 m A h g^-1,and it can still maintain a reversible capacity of 626 m A h g^-1 after 100 cycles.