Study On The Preparation And Application Of A Manganese Containing Complex And Its Derivatives As Electrodes

Now,lithium ion batteries have gradually come to our lives.Around us,lithium ion batteries can be used in electronic products such as mobile phones,tablet computers and so on.The reason for the wide application of lithium ion batteries is owing to the following advantages:high specific capacity,large working voltage,long cycle life,environmental protection,and so on.At present,the main cathode materials of lithium ion battery are Li CoO₂and three yuan material,and the anode is mainly graphite material.At present,the development of a good performance electrode material is the focus of the current researchers.In this paper,manganese containing organometallic coordination polymers and their derivatives were successfully prepared by hydrothermal synthesis,and their applications in lithium ion batteries were studied.In this paper,manganese containing metal organic coordination complex and their derivatives were successfully prepared by hydrothermal synthesis and high temperature solid state reaction,and their applications in lithium ion batteries were studied.（1）A metal organic coordination complex with discrete structure was synthesized by hydrothermal synthesis,and its structure,phase purity and morphology were characterized.The electrochemical performance of the electrode is good.Under the current density of50mA/g,the first discharge specific capacity can reach 7459.6mAh/g.It is calcined in the air as a precursor and forms the mixed oxides of Mn₃O₄ and Mn₂O₃ to make a battery,and the specific capacity of the first discharge can reach 699.2m Ah/g.After 100 cycles,the specific capacity can reach about 200mAh/g.（2）Through different sintering temperatures,it can be judged to contain different metal oxides.Among them,the products obtained by sintering at 850℃are convinced to be pure phase of Mn₂O₃.In addition,the sintered products at 750℃and 950℃are both mixed and confirmed to contain Mn₂O₃ and Mn₃O₄ by the analysis of the powder XRD patterns.（3）The electrochemical properties of sintered products at different temperatures were tested.The first discharge specific capacity of samples sintered at 750℃is 1261.2mAh/g.The specific discharge capacity of the sample sintered at 850℃is 699.2mAh/g.The specific discharge capacity of the sample sintered at 950℃is 879.3mAh/g.（4）We analyzed and explored the reasons for the high specific capacity of the battery made with the complex.Through reasoning and experimental analysis,we can find out the reason of higher specific capacity and found where the dissolved copper foil exists.（5）During the preparation of Li MnPO₄,the pure phase of Li MnPO₄ was hydrothermally synthesized at low cost by simplifying the experimental conditions.It has been analyzed by other testing methods such as powder XRD and so on.It is confirmed that the product is LiMnPO₄.The compound was made as anode material for lithium ion battery and its electrochemical performance was tested.