Silicon anodes tau nyiam kev saib xyuas zoo hauv kev lag luam roj teeb. Piv nrogcov roj teeb lithium-ionsiv cov graphite anodes, lawv tuaj yeem muab lub peev xwm loj dua 3-5 npaug. Lub peev xwm loj dua txhais tau tias lub roj teeb yuav kav ntev dua tom qab txhua qhov them, uas tuaj yeem ncua qhov kev tsav tsheb ntawm cov tsheb fais fab. Txawm hais tias silicon muaj ntau thiab pheej yig, lub voj voog them-tso tawm ntawm Si anodes yog txwv. Thaum lub sijhawm txhua lub voj voog them-tso tawm, lawv qhov ntim yuav nthuav dav heev, thiab txawm tias lawv lub peev xwm yuav poob qis, uas yuav ua rau tawg ntawm cov khoom electrode lossis delamination ntawm cov zaj duab xis electrode.

Pawg neeg KAIST, coj los ntawm Xibfwb Jang Wook Choi thiab Xibfwb Ali Coskun, tau tshaj tawm rau hnub tim 20 Lub Xya Hli ib qho nplaum molecular pulley rau cov roj teeb lithium ion loj nrog silicon anodes.

Pawg neeg KAIST tau muab cov molecular pulleys (hu ua polyrotaxanes) tso rau hauv cov roj teeb electrode binders, suav nrog kev ntxiv cov polymers rau cov roj teeb electrodes kom txuas cov electrodes rau cov hlau substrates. Cov nplhaib hauv polyrotane raug ntsia rau hauv cov pob txha polymer thiab tuaj yeem txav mus los tau yooj yim raws li pob txha.

Cov nplhaib hauv polyrotane tuaj yeem txav mus los tau yooj yim nrog qhov hloov pauv ntawm cov khoom silicon. Qhov sib txhuam ntawm cov nplhaib tuaj yeem ua kom cov duab ntawm cov khoom silicon zoo, yog li lawv yuav tsis tawg hauv cov txheej txheem hloov pauv tas mus li. Nws yog qhov tsim nyog tias txawm tias cov khoom silicon uas raug tsoo tuaj yeem sib sau ua ke vim yog qhov elasticity siab ntawm cov nplaum polyrotane. Lub luag haujlwm ntawm cov nplaum tshiab yog qhov sib txawv ntawm cov nplaum uas twb muaj lawm (feem ntau yog cov polymers yooj yim linear). Cov nplaum uas twb muaj lawm muaj qhov elasticity tsawg thiab yog li ntawd tsis tuaj yeem tswj tau cov duab ntawm cov khoom. Cov nplaum yav dhau los tuaj yeem tawg cov khoom tawg thiab txo lossis txawm tias poob lub peev xwm ntawm silicon electrodes.

Tus sau ntawv ntseeg tias qhov no yog ib qho kev qhia zoo heev txog qhov tseem ceeb ntawm kev tshawb fawb yooj yim. Polyrotaxane yeej qhov khoom plig Nobel xyoo tas los rau lub tswv yim ntawm "mechanical bonds". "Mechanical bonding" yog lub tswv yim tshiab uas tuaj yeem ntxiv rau cov tshuaj sib txuas lus, xws li covalent bonds, ionic bonds, coordination bonds thiab metal bonds. Kev tshawb fawb ntev ntev maj mam daws cov teeb meem ntev ntawm cov thev naus laus zis roj teeb ntawm tus nqi tsis tau xav txog. Cov kws sau ntawv kuj tau hais tias lawv tam sim no ua haujlwm nrog lub tuam txhab tsim roj teeb loj los koom ua ke lawv cov pulleys molecular rau hauv cov khoom roj teeb tiag tiag.

Sir Fraser Stoddart, tus yeej khoom plig Noble Laureate Chemistry Award xyoo 2006 ntawm Northwestern University, ntxiv tias: "Cov khoom sib txuas tau rov zoo thawj zaug hauv ib puag ncig khaws cia lub zog. Pab pawg KAIST tau siv cov khoom sib txuas hauv cov polyrotaxanes thiab alpha-cyclodextrin kauv polyethylene glycol ua haujlwm tau zoo, cim qhov kev tawg hauv kev ua tau zoo ntawm cov roj teeb lithium-ion hauv kev ua lag luam, thaum cov khoom sib xyaw ua ke nrog cov khoom sib txuas. Cov tshuaj sib xyaw hloov cov khoom siv ib txwm muaj nrog tsuas yog ib qho khoom sib txuas, uas yuav muaj kev cuam tshuam loj rau cov khoom ntawm cov ntaub ntawv thiab cov khoom siv.