Na likristale tsa metsi e le li-electrolyte ka libeteri tsa lithium-ion li tla etsa hore ho khonehe ho theha lisele tsa tšepe tsa lithium tse tsitsitseng?

Boithuto bo khahlisang ke Univesithi ea Carnegie Mellon. Bo-rasaense ba entse tlhahiso ea ho sebelisa likristale tsa metsi liseleng tsa lithium-ion ho eketsa matla a bona a matla, botsitso le matla a ho tjhaja. Mosebetsi ha o e-s'o tsoele pele, kahoo re tla emela bonyane lilemo tse hlano hore li phethoe - haeba ho khoneha.

Likristale tsa metsi li fetotse liponts'o, joale li ka thusa libeteri

Lethathamo la tse kahare

• Likristale tsa metsi li fetotse liponts'o, joale li ka thusa libeteri
  • Likristale tsa metsi e le leqheka la ho fumana electrolyte e tiileng ea metsi

Ka bokhutšoanyane: baetsi ba lisele tsa lithium-ion hajoale ba batla ho eketsa matla a matla a lisele ha ba ntse ba boloka kapa ba ntlafatsa ts'ebetso ea lisele, ho kenyelletsa, ka mohlala, ho ntlafatsa botsitso ho matla a phahameng a ho tjhaja. Morero ke ho etsa hore libeteri li be bobebe, li bolokehe, 'me li potlakele ho tjhaja. E batla e tšoana le kgutlotharo e potlakileng-e theko e tlase.

E 'ngoe ea litsela tsa ho eketsa haholo matla a khethehileng a lisele (ka makhetlo a 1,5-3) ke tšebeliso ea li-anode tse entsoeng ka tšepe ea lithium (Li-metal).... Ha se carbon kapa silicon, joalo ka pele, empa lithium, e leng ntho e ikarabellang ka ho toba bakeng sa matla a sele. Bothata ke hore tokisetso ena e potlakela ho hlahisa lithium dendrites, li-protrusions tsa tšepe tseo ka mor'a nako li kopanyang li-electrode tse peli, li li senya.

Likristale tsa metsi e le leqheka la ho fumana electrolyte e tiileng ea metsi

Hona joale mosebetsi o ntse o tsoela pele oa ho paka li-anode ka thepa e sa tšoaneng ho etsa khetla e ka ntle e lumellang ho phalla ha li-ion tsa lithium empa e sa lumelle mehaho e tiileng ho hōla. Tharollo e ka 'nang ea e-ba teng bothateng hape ke tšebeliso ea electrolyte e tiileng - lerako leo li-dendrites li ke keng tsa kenella ka lona.

Bo-rasaense ba Univesithing ea Carnegie Mellon ba ile ba nka mokhoa o fapaneng: ba batla ho lula le proven metsi electrolyte, empa e thehiloeng likristale metsi. Likristale tsa metsi ke mehaho e bohareng ba metsi le likristale, ke hore, lintho tse tiileng tse nang le mohaho o hlophisitsoeng. Likristale tsa metsi ke metsi, empa limolek'hule tsa tsona li laetsoe haholo (mohloli).

Boemong ba limolek'hule, sebopeho sa electrolyte ea kristale ea metsi ke sebopeho sa kristale feela mme ka hona se thibela kholo ea dendrites. Leha ho le joalo, re ntse re sebetsana le mokelikeli, ke hore, mohato o lumellang li-ion ho phalla pakeng tsa li-electrode. Khōlo ea dendrite e koetsoe, meroalo e tlameha ho phalla.

Sena ha se boleloe thutong, empa likristale tsa metsi li na le tšobotsi e 'ngoe ea bohlokoa: hang ha motlakase o sebelisoa ho bona, o ka hlophisoa ka tatellano e itseng (joalokaha u ka bona, mohlala, ka ho sheba mantsoe ana le moeli pakeng tsa batsho. ditlhaku le bokamorao bo bobebe). Kahoo ho ka 'na ha etsahala hore ha sele e qala ho tjhaja, limolek'hule tsa kristale tsa metsi li tla be li behiloe ka lehlakoreng le fapaneng' me li "scrape" dendritic deposits ho tloha ho li-electrode.

Ka pono, sena se tla tšoana le ho koaloa ha liphahlo, re re, ka sekoting sa ventilation.

The downside of the situation is that Univesithi ea Carnegie Mellon e sa tsoa qala lipatlisiso ka li-electrolyte tse ncha... Ho se ho ntse ho tsejoa hore botsitso ba bona bo tlase ho feta ba li-electrolyte tse tloaelehileng tsa metsi. Ho senyeha ha lisele ho etsahala ka potlako, 'me sena ha se tataiso e re khahlang. Leha ho le joalo, ho ka etsahala hore ha nako e ntse e ea bothata bo tla rarolloa. Ho feta moo, ha rea ​​lebella ho hlaha ha metsoako ea boemo bo tiileng pejana ho halofo ea bobeli ea lilemo tse leshome:

> LG Chem e sebelisa li-sulfide liseleng tse tiileng. Khoebo e tiileng ea electrolyte pele ho 2028

Setšoantšo sa selelekela: Lithium dendrite li thehoa holim'a eleketrode ea sele ea lithium-ion e nyane haholo. Setšoantšo se seholo se lefifi ka holimo ke electrode ea bobeli. "Bubble" ea pele ea liathomo tsa lithium e hlaha ka nako e 'ngoe, e theha "whisker" eo e leng motheo oa dendrite e hlahang (c) PNNL Unplugged / YouTube:

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