(Lithium metal anode) Chikamu chepakati pechiso che electrolyte itsva inobva kuanion

Solid Electrolyte Interphase (SEI) inoshandiswa zvakanyanya kutsanangura chikamu chitsva chinoumbwa pakati peanode ne electrolyte mumabhatiri ari kushanda. Mabhatiri esimbi e lithium (Li) ane simba rakawanda anokanganiswa zvakanyanya ne dendritic lithium deposition inotungamirwa ne non-uniform SEI. Kunyangwe iine zvakanakira zvakasiyana mukuvandudza kufanana kwe lithium deposition, mumashandisirwo anoshanda, mhedzisiro ye anion-derived SEI haina kunaka. Munguva pfupi yapfuura, boka rekutsvagisa raZhang Qiang kubva kuTsinghua University rakaronga kushandisa anion receptors kugadzirisa chimiro che electrolyte kuti vagadzire anion-derived SEI yakagadzikana. Iyo tris(pentafluorophenyl)borane anion receptor (TPFPB) ine maatomu e boron asina electron inoshanda ne bis(fluorosulfonimide) anion (FSI-) kuderedza kudzikira kwe FSI-. Pamusoro pezvo, kana paine TFPPB, mhando yemaion clusters (AGG) e FSI- mu electrolyte yakachinja, uye FSI- inoshanda neLi+ yakawanda. Saka, kuora kweFSI- kunosimudzirwa kugadzira Li2S, uye kugadzikana kweSEI inobva kuanion kunovandudzwa.

SEI inoumbwa nezvigadzirwa zve electrolyte zvinoderedza kuora. Maumbirwo nechimiro cheSEI zvinonyanya kudzorwa nechimiro che electrolyte, kureva kuti, kudyidzana kuri pakati pe solvent, anion, neLi+. Maumbirwo e electrolyte anochinja kwete chete nerudzi rwe solvent ne lithium salt, asiwo nekuwanda kwemunyu. Mumakore achangopfuura, high-concentration electrolyte (HCE) uye localized high-concentration electrolyte (LHCE) zvakaratidza mabhenefiti akasiyana mukusimbisa lithium metal anodes nekugadzira stable SEI. Molar ratio ye solvent kune lithium salt yakaderera (pasi pe2) uye anions anounzwa mu first solvation sheath yeLi+, zvichigadzira contact ion pairs (CIP) uye aggregation (AGG) muHCE kana LHCE. Maumbirwo eSEI anozodzorwa nemaanions muHCE neLHCE, iyo inonzi anion-derived SEI. Pasinei nekushanda kwayo kwakanaka mukusimbisa lithium metal anodes, ma SEI anowanikwa ne anion haana kukwana mukusangana nematambudziko emamiriro ezvinhu anoshanda. Saka, zvakakosha kuwedzera kugadzikana uye kufanana kweSEI inobva kuanion kuti tikwanise kukunda matambudziko aripo mumamiriro ezvinhu chaiwo.

Maanion ari muchimiro cheCIP neAGG ndiwo anonyanya kukonzera SEI inobva kuanion. Kazhinji, chimiro cheelectrolyte chemaanion chinodzorwa zvisina kunanga neLi+, nekuti positive charge yemamorekuru anonyungudutsa uye anonyungudutsa haana kusimba uye haagone kushanda zvakananga nemaanion. Nokudaro, nzira itsva dzekugadzirisa chimiro chemaanion electrolytes nekushanda zvakananga nemaanion dzinotarisirwa zvikuru.