Pa Aug 21st, Prof. MA Cheng wochokera ku yunivesite ya Science and Technology ya China (USTC) ndi ogwira nawo ntchito adakonza njira yabwino yothetsera vuto la kukhudzana ndi electrode-electrolyte yomwe ikulepheretsa chitukuko cha mabatire a Li a m'badwo wotsatira. Ma elekitirodi olimba olimba omwe adapangidwa mwanjira imeneyi amawonetsa luso lapadera komanso magwiridwe antchito.
Kusintha ma electrolyte amadzimadzi amadzimadzi m'mabatire wamba a Li-ion okhala ndi ma electrolyte olimba kumatha kuchepetsa zovuta zachitetezo, komanso kuswa "denga lagalasi" kuti mphamvu ikachuluke. Komabe, zida zodziwika bwino za electrode ndizolimba. Popeza kukhudzana kwa zinthu ziwiri zolimba sikutheka kukhala wapamtima ngati pakati pa zolimba ndi zamadzimadzi, pakadali pano mabatire otengera ma elekitirodi olimba amawonetsa kukhudzana kwa electrode-electrolyte kosakwanira komanso kusagwira bwino kwa cell yonse.
"Nkhani yokhudzana ndi electrode-electrolyte ya mabatire olimba kwambiri imakhala ngati ndodo yaifupi kwambiri ya mbiya yamatabwa," adatero Prof. MA Cheng wochokera ku USTC, mlembi wamkulu wa phunziroli. "Zowonadi, m'zaka izi ofufuza apanga kale maelekitirodi abwino kwambiri komanso ma electrolyte olimba, koma kusalumikizana bwino pakati pawo kukulepheretsabe kuyendetsa bwino kwa Li-ion."
Mwamwayi, njira za MA zitha kuthana ndi vuto lalikululi. Phunzirolo linayamba ndi kufufuza kwa atomu-ndi-atomu kwa gawo lodetsedwa mu prototype, perovskite-structured solid electrolyte. Ngakhale mawonekedwe a kristalo amasiyana kwambiri pakati pa zonyansa ndi ma electrolyte olimba, adawonedwa kuti apange ma epitaxial interfaces. Pambuyo pakuwunika kwatsatanetsatane kwamapangidwe ndi mankhwala, ofufuza adapeza kuti gawo lodetsedwa ndilokhazikika ndi ma elekitirodi apamwamba a Li-rich layered. Izi zikutanthauza kuti, ma electrolyte olimba amatha kuwonekera pa "template" yopangidwa ndi ma atomiki a electrode yogwira ntchito kwambiri, zomwe zimapangitsa kuti pakhale ma atomu apamtima.
"Izi ndizodabwitsa kwambiri," adatero wolemba woyamba LI Fuzhen, yemwe pano ndi wophunzira wa USTC. "Kupezeka kwa zonyansa m'zinthuzo ndi chinthu chofala kwambiri, chofala kwambiri moti nthawi zambiri sichidzanyalanyazidwa. Komabe, titaziyang'anitsitsa, tinapeza khalidwe losayembekezereka la epitaxial, ndipo linalimbikitsa mwachindunji njira yathu yowonjezeretsa kukhudzana kolimba."
Poyerekeza ndi njira yomwe imakonda kutsatiridwa mozizira, njira yomwe ofufuzawo apanga imatha kuzindikira kulumikizana kokwanira, kopanda msoko pakati pa ma electrolyte olimba ndi maelekitirodi pamlingo wa atomiki, monga zikuwonekera pa chithunzi cha microscopy cha atomic-resolution electron. （Zoperekedwa ndi gulu la MA.)
Potengera zomwe zachitika, ochita kafukufukuwo adawunikira mwadala ufa wa amorphous wokhala ndi mawonekedwe ofanana ndi ma electrolyte olimba opangidwa ndi perovskite pamtunda wa Li-rich layered pawiri, ndipo adazindikira bwino kukhudzana kosasinthika pakati pa zida ziwirizi zolimba mu electrode yophatikizika. Ndi vuto lolumikizana ndi ma elekitirodi-electrolyte litayankhidwa, ma elekitirodi olimba olimba otere adapereka mphamvu yofananira ndi yamagetsi olimba amadzimadzi. Chofunika kwambiri, ochita kafukufuku adapezanso kuti mtundu uwu wa epitaxial solid-solid contact ukhoza kulekerera kusiyana kwakukulu kwa lattice, motero njira yomwe akuganiza ikhoza kugwiritsidwa ntchito pa ma electrolyte ena ambiri a perovskite olimba ndi ma electrode osanjikiza.
"Ntchitoyi idawonetsa njira yomwe iyenera kutsatira," adatero MA. “Kugwiritsa ntchito mfundo yomwe yatchulidwa pano pa zinthu zina zofunika kwambiri kungathandize kuti maselo azitha kugwira bwino ntchito komanso sayansi yosangalatsa kwambiri. Tikuyembekezera zimenezi.”
Ofufuzawo akufuna kupitiriza kufufuza kwawo kumbali iyi, ndikugwiritsanso ntchito njira yomwe ikuperekedwa ku ma cathodes ena apamwamba kwambiri.
Kafukufukuyu adasindikizidwa pa Matter, nyuzipepala yapamwamba ya Cell Press, yotchedwa "Atomically Intimate Contact pakati pa Solid Electrolytes ndi Electrodes for Li Batteries". Wolemba woyamba ndi LI Fuzhen, wophunzira womaliza wa USTC. Othandizira a Prof. MA Cheng akuphatikizapo Prof. NAN Ce-Wen wochokera ku yunivesite ya Tsinghua ndi Dr. ZHOU Lin wochokera ku Ames Laboratory.
(Sukulu ya Chemistry ndi Material Sciences)
Ulalo wamapepala: https://www.cell.com/matter/fulltext/S2590-2385(19)30029-3
Nthawi yotumiza: Jun-03-2019