High Energy Density Battery: Using Advanced Carbon to Provide Sufficient Electrolyte Pathways and Increase the SeS2Content

Abstract

Inthisstudy,therelationshipbetweenthecarbonmorphologyandtheSeS2/Cbatteryisinvestigated.Previously,scientistshavedifficultyforsolvinglowdischargevoltage(<1.7V)ofthefirstcyclewhenSeS2contentisincreasedmorethan65wt.%[1,2],whichinterferestoreachthehighenergydensityduetoalowweightpercentageofactivematerialsinthecathode.Toaddressthisissue,advancedorderedmesoporouscarbons(OMCs)thatmodifiedthetotalporevolumeandmorphologiesareadapted.TherearethreetypesofOMCshapesthathavedifferentmorphologiesandtotalporevolumeasshowninFig.1:rod-type(R-OMC,2.26cm3/g),platelet-type(P-OMC,2.05cm3/g)andgrain-type(G-OMC,1.33cm3/g).TheP-OMCandtheR-OMCseemtosolvethisproblembecausethelargeporevolume(>2cm3/g)ofOMCcanprovidessufficientamountsofelectrolytepathwayseventhoughtheycontainhighSeS2(75wt.%)inthecomposites,sotheyresultinahighdischargevoltage(1.9V)ofthefirstcyclewithhighloadingcondition.