| With the increasingly serious problem of environmental pollution,the search for clean energy has become one of the most pressing issues in the economy and society.As a new energy material,lithium ion battery materials have broad development prospects.In terms of material selection,transition metal oxides have become promising lithium-ion battery anode materials due to their high theoretical specific capacity and abundant sources,which have attracted much attention from researchers.However,the transition metal oxide undergoes volume expansion during charge and discharge,which causes the electrode to smash and lead to poor cycle performance of the lithium ion battery.In response to this problem,this article designs metal-organic framework materials?MOFs?As a component of a lithium ion battery anode material.Metal organic frameworks?MOFs?are a class of promising porous materials constructed by covalent bonding of metal ions and organic ligands.They are used in gas storage/separation,heterogeneous catalysis,biology,sensing,and proton/conductivity.It has a wide range of applications.Among the functional applications of MOFs,photocatalysis is one of the fastest growing application areas.With the large selection range offered by traditional inorganic and organic materials,the active catalytic sites and catalytic properties of MOF materials can be designed.The catalytic activity of MOF materials can be generated by either the framework or the guest.The pore sizes of MOF materials range from a few angstroms to a few nanometers.From small-sized gas molecules to large-sized inorganic and organic compounds,they are very suitable for being encapsulated by MOFs.Encapsulating guest catalytic molecules into the pores of MOFs provides an effective way to achieve MOF functionalization.In this paper,by properly constructing its nanostructures,designing metal-organic framework materials?MOFs?as components of lithium ion battery anode materials,the core is attached to the metal-organic framework material to regulate its morphology,and by optimizing the binder Kind and so on.Through continuous regulation and testing,the new material Fe2P-Fum-C designed and synthesized as a negative electrode material for lithium ion batteries has shown excellent lithium storage performance and long-cycle stability.Specific tasks include:?1?Under appropriate conditions,Fe-MIL-88A MOF material is synthesized by hydrothermal precipitation method.The size ranges from several hundred nanometers to several micrometers.It has a three-dimensional pore structure,which is beneficial to the full contact between the electrolyte and the material.It is beneficial to provide buffer for material volume expansion during charge and discharge.The material was tested for electrochemical performance and modified.?2?Phosphate firing treatment of the material,Fe2P-Fum-C test its electrochemical performance,the results show that it can provide higher capacity,after 200 cycles at 1.0 A g-11 can provide 1144 mAh g-11 Battery capacity and shows long cycle life at 3.0 A g-1.The capacity after 1400 cycles is 439 mAh g-1.MOF materials are processed by non-phosphorization firing,and the electrochemical performance of the tester is compared.By designing new materials,which have been improved compared to the original,and designing and analyzing new synthetic materials that may be applied in the future.?3?Based on the phosphating post-treatment material,it is modified and tested,and high-power batteries are prepared by adding different amounts of carbon nanotubes to the iron fumarate MOF anode material,and its capacity,high current discharge performance,Investigate the high load and cycle life,and how the test will affect the battery material.By investigating the addition of carbon nanotubes,it is beneficial to improve the overall performance of the battery.The battery with the content of 7.7%?w?carbon nanotubes has the best overall performance,especially in terms of high rate and high capacity. |
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