Silicon anodes tau nyiam cov xim zoo nkauj hauv kev lag luam roj teeb.Piv nroglithium-ion roj teebsiv graphite anodes, lawv muaj peev xwm muab 3-5 zaug loj dua.Lub peev xwm loj dua txhais tau hais tias lub roj teeb yuav kav ntev dua tom qab txhua qhov kev them nqi, uas tuaj yeem txuas ntxiv kev tsav tsheb ntawm lub tsheb fais fab.Txawm hais tias silicon muaj ntau thiab pheej yig, cov nqi them tawm ntawm Si anodes raug txwv.Thaum lub sij hawm txhua lub voj voog tawm, lawv lub ntim yuav nthuav dav heev, thiab txawm tias lawv lub peev xwm yuav poob qis, uas yuav ua rau tawg ntawm electrode hais los yog delamination ntawm electrode zaj duab xis.

Pab pawg KAIST, coj los ntawm xibfwb Jang Wook Choi thiab xibfwb Ali Coskun, tau tshaj tawm rau 20 Lub Xya Hli ib qho molecular pulley nplaum rau lub peev xwm loj lithium ion roj teeb nrog silicon anodes.

Pab pawg KAIST tau koom ua ke molecular pulleys (hu ua polyrotaxanes) rau hauv cov roj teeb electrode binders, suav nrog ntxiv cov polymers rau lub roj teeb electrodes los txuas cov electrodes rau hlau substrates.Cov rings nyob rau hauv polyrotane yog ntsia hlau rau hauv lub cev pob txha thiab tuaj yeem txav mus los ntawm cov pob txha.

Cov nplhaib hauv polyrotane tuaj yeem txav tau yooj yim nrog lub ntim hloov ntawm silicon hais.Lub nplhaib ntawm lub nplhaib tuaj yeem ua kom zoo ntawm cov khoom siv silicon, yog li ntawd lawv yuav tsis tawg rau hauv cov txheej txheem hloov pauv tas li.Nws yog noteworthy tias txawm crushed silicon hais yuav nyob twj ywm coalescent vim lub siab elasticity ntawm polyrotane adhesives.Kev ua haujlwm ntawm cov nplaum tshiab yog qhov sib txawv ntawm qhov sib txawv ntawm cov nplaum uas twb muaj lawm (feem ntau yooj yim linear polymers).Cov nplaum uas twb muaj lawm muaj qhov txwv elasticity thiab yog li tsis tuaj yeem tuav cov khoom zoo.Cov nplaum yav dhau los tuaj yeem cuam tshuam cov khoom tawg thiab txo lossis txawm tias poob lub peev xwm ntawm silicon electrodes.

Tus sau ntseeg tias qhov no yog ib qho kev qhia zoo heev ntawm qhov tseem ceeb ntawm kev tshawb fawb hauv paus.Polyrotaxane yeej qhov khoom plig Nobel xyoo tas los rau lub tswv yim ntawm "cov khoom siv tshuab"."Mechanical bonding" yog ib lub tswv yim tshiab uas tau muab ntxiv rau cov khoom siv tshuaj lom neeg xws li covalent bonds, ionic bonds, coordination bonds and metal bonds.Kev tshawb fawb ntev ntev yog maj mam daws cov teeb meem ntev ntev ntawm cov roj teeb thev naus laus zis ntawm tus nqi npaj txhij txog.Cov kws sau ntawv kuj tau hais tias tam sim no lawv tab tom ua haujlwm nrog cov chaw tsim khoom roj teeb loj los ua ke lawv cov molecular pulleys rau hauv cov khoom siv roj teeb tiag.

Sir Fraser Stoddart, 2006 Noble Laureate Chemistry Award tus yeej ntawm Northwestern University, tau hais ntxiv tias: "Cov nyiaj siv tshuab tau zoo dua thawj zaug hauv qhov chaw khaws cia lub zog.Pab pawg KAIST txawj siv cov cuab yeej cuab tam hauv cov hlua khi-ntiv nplhaib polyrotaxanes thiab ua haujlwm alpha-cyclodextrin kauv polyethylene glycol, kos ib qho kev ua tiav ntawm kev ua haujlwm ntawm lithium-ion roj teeb ntawm kev ua lag luam, thaum rub-shaped aggregates nrog mechanical binders.Cov khoom sib xyaw hloov cov khoom siv ib txwm siv nrog ib daim ntawv cog lus tshuaj, uas yuav muaj kev cuam tshuam loj rau cov khoom siv thiab cov khoom siv.