(Lithium metal anode) Interfacial phase ya electrolyte yatsopano yochokera ku anion

Solid Electrolyte Interphase (SEI) imagwiritsidwa ntchito kwambiri pofotokoza gawo latsopano lomwe limapangidwa pakati pa anode ndi electrolyte m'mabatire ogwira ntchito. Mabatire achitsulo a lithiamu (Li) okhala ndi mphamvu zambiri amalepheretsedwa kwambiri ndi dendritic lithium deposition motsogozedwa ndi non-uniform SEI. Ngakhale kuti ili ndi ubwino wapadera pakukweza kufanana kwa lithiamu deposition, mu ntchito zenizeni, zotsatira za anion-derived SEI sizoyenera. Posachedwapa, gulu lofufuza la Zhang Qiang kuchokera ku Tsinghua University linapereka lingaliro logwiritsa ntchito anion receptors kusintha kapangidwe ka electrolyte kuti apange anion-derived SEI yokhazikika. Tris(pentafluorophenyl)borane anion receptor (TPFPB) yokhala ndi maatomu a boron osowa ma electron imalumikizana ndi bis(fluorosulfonimide) anion (FSI-) kuti ichepetse kukhazikika kwa FSI-. Kuphatikiza apo, pamaso pa TFPPB, mtundu wa ma ion clusters (AGG) a FSI- mu electrolyte wasintha, ndipo FSI- imalumikizana ndi Li+ yambiri. Chifukwa chake, kuwonongeka kwa FSI- kumalimbikitsidwa kuti kupange Li2S, ndipo kukhazikika kwa SEI yochokera ku anion kumawonjezeka.

SEI imapangidwa ndi zinthu zochepetsera kuwonongeka kwa electrolyte. Kapangidwe ndi kapangidwe ka SEI zimayendetsedwa makamaka ndi kapangidwe ka electrolyte, kutanthauza kuti, kuyanjana kwa microscopic pakati pa solvent, anion, ndi Li+. Kapangidwe ka electrolyte kamasintha osati kokha ndi mtundu wa solvent ndi mchere wa lithiamu, komanso ndi kuchuluka kwa mchere. M'zaka zaposachedwa, electrolyte yochuluka kwambiri (HCE) ndi electrolyte yochuluka kwambiri (LHCE) yawonetsa ubwino wapadera pakukhazikika kwa anode yachitsulo cha lithiamu popanga SEI yokhazikika. Chiŵerengero cha molar cha solvent ku mchere wa lithiamu ndi chochepa (chosakwana 2) ndipo anions amalowetsedwa mu sheath yoyamba ya solvation ya Li+, ndikupanga ma contact ion pairs (CIP) ndi aggregation (AGG) mu HCE kapena LHCE. Kapangidwe ka SEI pambuyo pake kamayendetsedwa ndi anions mu HCE ndi LHCE, yomwe imatchedwa anion-derived SEI. Ngakhale kuti imagwira ntchito bwino pakukhazikika kwa anode yachitsulo cha lithiamu, ma SEI omwe amapezeka pano ndi anion sakwanira kuthana ndi zovuta za mikhalidwe yogwira ntchito. Chifukwa chake, ndikofunikira kupititsa patsogolo kukhazikika ndi kufanana kwa SEI yochokera ku anion kuti tithetse mavuto omwe alipo pamikhalidwe yeniyeni.

Ma anion omwe ali mu mawonekedwe a CIP ndi AGG ndi omwe amatsogolera kwambiri ku SEI yochokera ku anion. Kawirikawiri, kapangidwe ka electrolyte ka anions kamayendetsedwa mwanjira ina ndi Li+, chifukwa mphamvu yabwino ya mamolekyulu osungunulira ndi osungunuka imakhala yofooka ndipo singathe kuyanjana mwachindunji ndi anion. Chifukwa chake, njira zatsopano zowongolera kapangidwe ka ma electrolyte a anionic polumikizana mwachindunji ndi anion zikuyembekezeredwa kwambiri.