Solid Electrolyte Interphase (SEI) yog dav siv los piav txog cov theem tshiab tsim ntawm cov anode thiab cov electrolyte hauv cov roj teeb ua haujlwm.Lub zog loj ntom ntom lithium (Li) cov roj teeb hlau muaj kev cuam tshuam loj heev los ntawm dendritic lithium deposition coj los ntawm non-uniform SEI.Txawm hais tias nws muaj qhov tshwj xeeb zoo hauv kev txhim kho qhov sib xws ntawm lithium deposition, hauv kev siv cov tswv yim, cov nyhuv ntawm anion-derived SEI tsis zoo tagnrho.Tsis ntev los no, Zhang Qiang cov kev tshawb fawb pab pawg los ntawm Tsinghua University tau thov kom siv cov tshuaj anion receptors los kho cov qauv electrolyte los tsim cov anion-derived SEI ruaj khov.Lub tris (pentafluorophenyl) borane anion receptor (TPFPB) nrog electron-deficient boron atoms cuam tshuam nrog bis (fluorosulfonimide) anion (FSI-) kom txo qis stability ntawm FSI-.Tsis tas li ntawd, nyob rau hauv lub xub ntiag ntawm TFPPB, hom ion pawg (AGG) ntawm FSI- hauv cov electrolyte tau hloov, thiab FSI- cuam tshuam nrog ntau Li +.Yog li ntawd, lub decomposition ntawm FSI- yog txhawb los tsim Li2S, thiab stability ntawm anion-derived SEI yog txhim kho.
SEI yog tsim los ntawm kev txo qis decomposition khoom ntawm electrolyte.Cov muaj pes tsawg leeg thiab cov qauv ntawm SEI feem ntau yog tswj los ntawm cov qauv ntawm cov electrolyte, uas yog, microscopic cuam tshuam ntawm hnyav, anion, thiab Li +.Cov qauv ntawm cov electrolyte hloov tsis tau tsuas yog nrog cov kuab tshuaj thiab lithium ntsev, tab sis kuj nrog cov concentration ntawm ntsev.Nyob rau hauv xyoo tas los no, high-concentration electrolyte (HCE) thiab localized high-concentration electrolyte (LHCE) tau qhia tshwj xeeb zoo hauv stabilizing lithium hlau anodes los ntawm kev tsim ib tug ruaj khov SEI.Cov molar piv ntawm cov kuab tshuaj rau lithium ntsev yog tsawg (tsawg dua 2) thiab cov anions tau nkag mus rau hauv thawj kev daws teeb meem ntawm Li +, tsim kev sib cuag ion khub (CIP) thiab kev sib sau ua ke (AGG) hauv HCE lossis LHCE.Cov muaj pes tsawg leeg ntawm SEI yog tom qab tswj los ntawm anions hauv HCE thiab LHCE, uas yog hu ua anion-derived SEI.Txawm hais tias nws qhov kev ua tau zoo txaus nyiam hauv kev ruaj khov lithium hlau anodes, cov anion-derived SEIs tam sim no tsis txaus los ua kom tau raws li cov kev cov nyom ntawm cov tswv yim.Yog li ntawd, nws yog ib qho tsim nyog los txhim kho kev ruaj ntseg thiab sib xws ntawm anion-derived SEI kom kov yeej cov kev cov nyom hauv cov xwm txheej tiag tiag.
Anions nyob rau hauv daim ntawv ntawm CIP thiab AGG yog lub ntsiab precursors rau anion-derived SEI.Feem ntau, cov qauv electrolyte ntawm anions yog kev tswj tsis ncaj los ntawm Li +, vim tias qhov zoo ntawm cov kuab tshuaj thiab cov kuab tshuaj molecules tsis muaj zog hauv zos thiab tsis tuaj yeem cuam tshuam ncaj qha nrog anions.Yog li ntawd, cov tswv yim tshiab rau kev tswj cov qauv ntawm anionic electrolytes los ntawm kev cuam tshuam ncaj qha nrog anions yog qhov xav tau heev.
Post lub sij hawm: Nov-22-2021