| Liquid redox flow batteries（LRFBs）are considered as one of the most suitable technologies for large-scale energy storage due to its high safety and relatively independent equipment units.Compared with lithium-ion batteries（LIBs）,it has significant advantages such as flexible design and high security.It can not only meet the requirements of large-scale energy storage,but also realize the functions of peak shaving and frequency modulation of power grid.However,the energy density of LRFBs is limited by the solubility of active material,and it requires the expensive ion exchange membranes,which makes the cost of the battery relatively high,limiting its large-scale development.In recent years,in order to solve the problem of low energy density,a new type of LRFBs has been developed:lithium-based slurry battery（LSB）.It not only has the advantages of high voltage and high energy density of LIBs,but also has the characteristics of independent design of LRFBs.At present,the research on lithium-based slurry battery is mainly focused on the development of high-performance cathode and anode active materials.There is a lack of systematic research on the effect of the morphology and amounts of conductive additives in the electrode slurry on the electrochemical performance of the slurry battery.1.Based on the above introduction,this work starts from the study of the morphology and the amount of different conductive agents,and deeply explores the reasons for their impact on the electrochemical performance of the slurry battery,and finds a universal solution in the slurry battery through comparison.Firstly,the effects of the morphology of conductive additives on the physical and electrochemical properties of the slurry battery under the condition of the same amount of addition were preliminarily explored by comparing the current conventional zero-dimensional,one-dimensional,and two-dimensional conductive additives.By comparing the electrochemical performance of static batteries,the best of three conductive additives was selected,and the electrochemical performance of slurry batteries was tested using commercial lithium iron phosphate（Li Fe PO4）as the active materials.This work provides ideas for the selection of conductive additives in slurry batteries.2.Secondly,the conductive additives and active materials in the slurry battery undergo indirect separation under shear force during flow,which greatly affects the stability of the conductive network in the slurry.By regulating the composite method of conductive additives and active materials,the electrochemical performance of slurry batteries can be further improved.Therefore,this work designed a metal organic framework（MOF）as a precursor to uniformly disperse multi walled carbon nanotubes（MWCNTs）in the raw material to prepare MIL-100（Mn）/CNTs.After high-temperature calcination in Ar atmosphere,a composite material of conductive additives and active materials is prepared Mn O@C/CNTs.Compared with simple hybrid,this composite material has a more stable conductive network,and the active material formed after MOF carbonization is uniform in size and small in size,exhibiting better cycling and rate performance.This work provides ideas for designing new electrode materials for slurry batteries. |
