Fabrication And Performance Study Of Metal Oxide/Conjugated Microporous Polymer Based Hard Carbon Compounds

Mesoporous activated carbon(MAC)and conjugated microporous polymers(CMP)have good adsorption and stable chemical properties.In this paper,We obtain the preparation of porous composites materials by calcinating the two substances(MAC and CMP)and the metal salt solution in high temperature.Porous hard carbon(PHC)can be obtained by calcinating CMP in high temperature.The morphology and microstructure of the composites are characterized by electrochemical methods and XRD,SEM,TEM,elemental analysis and specific surface area measurement.The main contents of this paper are as follows:Part 1: In this paper,four manganese acetate with different mass percentage of MAC are mixed in distilled water and then dried and moved to the calciner for thermal decomposition to obtain the MnO/MAC composite materials(the content of MAC is 24 %?34 %?49 %).Its results show that: the MnO/MAC composite materials have the best rate performance and cycle performance when the content of MAC is24 %.The specific discharge and charge capacity of 0.2 C are 1086.1 m Ah/g and600.6 m Ah/g at the first time.the charge specific capacity of the 24 % MAC composite is 185.7 m Ah/g at the rate of 20 C.after 100 charge and discharge cycles at the rate of 1 C,the charge specific capacity is 363.6 m Ah/g,the capacity retention rate is still 99.1 %.Part 2: We use CMP and the metal salt solution are mixed and then moved to the calcining furnace with nitrogen protection to obtain the metal oxide/PHC composite materials with constant temperature.we obtain the metal oxides(MnO,Ni O,Li2 O,Co O)/PHC composites with the mass fraction of metal oxides is 10 %.The four kinds of materials are tested at the constant current charging and discharging,It can be concluded that MnO(10 %)/PHC composites has the best electrochemical performance.Under the rate of 60 C,the specific charge capacity is 192.7 m Ah/g.After 80 cycles at the rate of 1 C,The specific capacity is obviously higher than its initial capacity.Consequently.MnO(10 %)/PHC composites exhibit the best rate performance and cycle performance.In this part,We can obtain the MnO/PHC compound materials(the content of MnO is10 %,20 % and 40 %)by drying and thermolysis after the CMP and the manganese acetate solution mixed with different mass percentages.Comparing the electrochemical properties and the data analysis of the three composites,we canconclude that with the increase of the mass fraction of metal oxide(MnO),the rate performance and cycle performance of the material are decreasing.Thus,The electrochemical properties of MnO(10 %)/PHC composites are better than the other two composites.the MnO(10 %)/PHC composites and PHC material are further studied,the results show that:The charge specific capacity are 192.7 m Ah/g and 181.8 m Ah/g at the rate of 60 C.The MnO(10 %)/PHC composites have higher reversible capacity than PHC material at the rate of 1 C with the cycle of 300 times and at the rate of 2 C with the cycle of 700 times,The experimental results show that the MnO(10 %)/PHC composite has the best electrochemical performance.The scanning and transmission electron microscopy analysis shows that MnO nanoparticles are embedded into PHC nanoparticles in MnO(10%)/PHC composite.