I-Silicon anode itsale umdla omkhulu kwishishini lebhetri.Xa kuthelekiswa neiibhetri ze-lithium-ionusebenzisa i-graphite anodes, inokubonelela ngama-3-5 amandla amakhulu.Umthamo omkhulu uthetha ukuba ibhetri iya kuhlala ixesha elide emva kwentlawulo nganye, enokwandisa kakhulu umgama wokuqhuba izithuthi zombane.Nangona i-silicon ininzi kwaye inexabiso eliphantsi, imijikelo yokukhupha intlawulo ye-Si anode inomda.Ngethuba lokujikeleza kwentlawulo-ukukhutshwa, umthamo wabo uya kwandiswa kakhulu, kwaye i-capacitance yabo iya kuncipha, okuya kubangela ukuphulwa kweengqungquthela ze-electrode okanye i-delamination yefilimu ye-electrode.

Iqela le-KAIST, elikhokelwa nguNjingalwazi uJang Wook Choi kunye noProfesa u-Ali Coskun, babike ngomhla we-20 kaJulayi i-adhesive ye-molecular pulley ye-lithium ion ibhetri enkulu ene-silicon anodes.

Iqela le-KAIST lidibanise i-pulleys ye-molecular (ebizwa ngokuba yi-polyrotaxanes) kwii-binders ze-electrode zebhetri, kubandakanywa nokongeza iipolymers kwii-electrodes zebhetri ukuze zifake i-electrodes kwii-substrates zetsimbi.Izangqa kwi-polyrotane zikrwelwe kwi-polymer skeleton kwaye zinokuhamba ngokukhululekileyo ecaleni kwamathambo.

Amakhonkco kwi-polyrotane angakwazi ukuhamba ngokukhululekileyo kunye nokuguqulwa kwevolumu yamasuntswana e-silicon.I-slip of rings inokugcina ngokufanelekileyo imilo ye-silicon particles, ukwenzela ukuba ayiyi kutshabalalisa kwinkqubo yokutshintsha umthamo oqhubekayo.Kuyaphawuleka ukuba amasuntswana e-silicon atyunyuziweyo anokuhlala emanyene ngenxa yokuqina okuphezulu kwe-polyrotane adhesives.Umsebenzi we-adhesives entsha uhluke kakhulu kwi-adhesives ekhoyo (ngokuqhelekileyo i-polymers elula elula).I-adhesives ekhoyo ine-elasticity encinci kwaye ngoko ayikwazi ukugcina ngokuqinileyo i-particle shape.Izinto ezincamathelayo zangaphambili zinokusasaza amasuntswana atyumkileyo kwaye zinciphise okanye zide ziphulukane nomthamo we-silicon electrode.

Umbhali ukholelwa ukuba lo ngumboniso ogqwesileyo wokubaluleka kophando olusisiseko.I-Polyrotaxane iphumelele i-Nobel Prize kunyaka odlulileyo kwimbono "ye-mechanical bonds"."I-Mechanical bonding" yingcamango esandul 'ukuchazwa enokuthi yongezwe kwiibhondi zekhemikhali zakudala, ezifana ne-covalent bonds, i-ionic bonds, i-coordination bonds kunye neebhondi zetsimbi.Uphando olusisiseko lwexesha elide lujongana ngokuthe ngcembe nemingeni yexesha elide yobuchwepheshe bebhetri ngesantya esingalindelekanga.Ababhali bakwakhankanye ukuba ngoku basebenza nomenzi omkhulu webhetri ukudibanisa iipulleys zabo zeemolekyuli kwiimveliso zebhetri zokwenyani.

UMhlekazi uFraser Stoddart, ophumelele iBhaso leNoble Laureate Chemistry ngo-2006 kwiYunivesithi yaseNorthwestern, wongeze ngelithi: “Iibhondi zoomatshini ziphinde zachacha okokuqala kwindawo yokugcina amandla.Iqela le-KAIST lisebenzise ngobuchule i-binders mechanical binders kwi-slip-ring polyrotaxanes kunye ne-alpha-cyclodextrin spiral polyethylene glycol, ephawula ukuphumelela ekusebenzeni kweebhetri ze-lithium-ion kwimarike, xa i-pulley-shaped aggregates ene-binders mechanical.Iikhompawundi zithatha indawo yezinto eziqhelekileyo kunye nebhondi enye yeekhemikhali, eya kuba nefuthe elibalulekileyo kwiipropati zezixhobo kunye nezixhobo.