Baenjiniere ba Univesithing ea California San Diego ba thehile libeteri tsa lithium-ion tse sebetsang hantle tlas'a serame se batang le mocheso o batang haholo, ha li ntse li paka matla a mangata.Bafuputsi ba ile ba finyella sena ka ho hlahisa electrolyte e sa fetoheng feela le e matla ho pholletsa le mocheso o pharaletseng, empa hape e lumellana le anode e matla le cathode.
Libetri tse mamellang mochesoli hlalositsoe pampiring e hatisitsoeng bekeng ea July 4 ho Proceedings of the National Academy of Sciences (PNAS).
Libetri tse joalo li ne li ka lumella likoloi tsa motlakase sebakeng se batang hore li tsamaee hole ka tefiso e le ’ngoe;ba ka boela ba fokotsa tlhokahalo ea mekhoa e pholileng ho boloka lipakete tsa libeteri tsa likoloi hore li se ke tsa chesa haholo libakeng tse chesang, ho boletse Zheng Chen, moprofesa oa nanoengineering UC San Diego Jacobs School of Engineering le mongoli e moholo oa thuto.
"U hloka ts'ebetso ea mocheso o phahameng libakeng tseo mocheso oa tikoloho o ka fihlelang lipalo tse tharo 'me litsela li chesa le ho feta.Likoloi tsa motlakase, lipakete tsa betri hangata li ka tlas'a fatše, haufi le litsela tsena tse chesang, "ho hlalosa Chen, eo hape e leng setho sa lefapha la UC San Diego Sustainable Power and Energy Center.Hape, libeteri li futhumala feela ka lebaka la ho ba le motlakase nakong ea ts'ebetso.Haeba libeteri li sitoa ho mamella mocheso ona ka mocheso o phahameng, ts'ebetso ea tsona e tla fokotseha kapele. "
Litekong, libeteri tsa bopaki ba mohopolo li bolokile 87.5% le 115.9% ea matla a tsona ho -40 le 50 C (-40 le 122 F), ka ho latellana.Ba ne ba boetse ba e-na le ts'ebetso e phahameng ea Coulombic ea 98.2% le 98.7% ho lithempereichara tsena, ka ho latellana, ho bolelang hore libeteri li ka ba le litefello tse eketsehileng le ho qeta nako pele li khaotsa ho sebetsa.
Libetri tse entsoeng ke Chen le basebetsi-'moho le tsona li mamella serame le mocheso ka lebaka la electrolyte ea bona.E entsoe ka tharollo ea metsi ea dibutyl ether e kopantsoeng le letsoai la lithium.Ntho e ikhethang ka dibutyl ether ke hore limolek'hule tsa eona li tlama ka mokhoa o fokolang ho li-ion tsa lithium.Ka mantsoe a mang, limolek'hule tsa electrolyte li ka tlohela li-ion tsa lithium ha betri e ntse e sebetsa.Tšebelisano ena e fokolang ea limolek'hule, bafuputsi ba e fumane thutong e fetileng, e ntlafatsa ts'ebetso ea betri ka mocheso o ka tlaase ho zero.Ho feta moo, dibutyl ether e ka nka mocheso habonolo hobane e lula e le metsi mochesong o phahameng (e na le ntlha e belang ea 141 C, kapa 286 F).
Ho tsitsisa lik'hemik'hale tsa lithium-sulfur
Ntho e ikhethang ka electrolyte ena ke hore e lumellana le betri ea lithium-sulfur, e leng mofuta oa betri e nchafalitsoeng e nang le anode e entsoeng ka tšepe ea lithium le cathode e entsoeng ka sebabole.Libetri tsa lithium-sulphur ke karolo ea bohlokoa ea mahlale a morao-rao a betri hobane a ts'episa matla a phahameng a matla le litšenyehelo tse tlase.Li ka boloka matla a fetang makhetlo a mabeli ka kilogram e le 'ngoe ho feta libeteri tsa kajeno tsa lithium-ion - sena se ka etsa habeli palo ea likoloi tsa motlakase ntle le keketseho ea boima ba pakete ea betri.Hape, sebabole se ngata haholo ebile ha se na bothata ho tsoa mohloling ho feta cobalt e sebelisoang li-cathode tsa betri tsa lithium-ion.
Empa ho na le mathata ka libeteri tsa lithium-sulfur.Ka bobeli cathode le anode li sebetsa hantle haholo.Li-cathode tsa Sulfur li sebetsa haholo hoo li qhibilihang nakong ea ts'ebetso ea betri.Taba ena e mpefala ka mocheso o phahameng.Mme lithium metal anode li tloaetse ho etsa meaho e kang nale e bitsoang dendrites e ka phunyang likarolo tsa betri, e etsa hore e tsamaee nako e khuts'oane.Ka lebaka leo, libeteri tsa lithium-sulfur li tšoarella ho fihlela ho mashome a potoloho.
"Haeba u batla betri e nang le matla a mangata a matla, hangata ho hlokahala hore u sebelise k'hemistri e thata haholo, e rarahaneng," ho boletse Chen."Matla a phahameng a bolela hore liketso tse ngata li etsahala, ho bolelang hore ho na le botsitso bo fokolang, ho senyeha ho eketsehileng.Ho etsa betri e nang le matla a phahameng e tsitsitseng ke mosebetsi o boima ka bo oona - ho leka ho etsa sena ka mefuta e mengata ea mocheso ho thata le ho feta. "
Dibutyl ether electrolyte e entsoeng ke sehlopha sa UC San Diego e thibela litaba tsena, esita le ka mocheso o phahameng le o tlaase.Libetri tseo ba li lekileng li bile le bophelo bo bolelele ba libaesekele ho feta betri e tloaelehileng ea lithium-sulfur."Electrolyte ea rona e thusa ho ntlafatsa lehlakore la cathode le lehlakoreng la anode ha e ntse e fana ka conductivity e phahameng le botsitso ba sefahleho," ho boletse Chen.
Sehlopha se ile sa boela sa etsa boenjiniere ba sulfur cathode hore e tsitse haholoanyane ka ho e hlomathisetsa ho polymer.Sena se thibela sebabole se eketsehileng hore se se ke sa qhibiliha ka har'a electrolyte.
Mehato e latelang e kenyelletsa ho eketsa k'hemistri ea betri, ho e etsa hore e sebetse ka mocheso o phahameng le ho feta le ho lelefatsa bophelo ba potoloho.
Pampiri: "Litekanyetso tsa khetho ea solvent bakeng sa libeteri tsa lithium-sulfur tse mamellang mocheso."Bangoli-'moho ba kenyelletsa Guorui Cai, John Holoubek, Mingqian Li, Hongpeng Gao, Yijie Yin, Sicen Yu, Haodong Liu, Tod A. Pascal le Ping Liu, kaofela ha UC San Diego.
Mosebetsi ona o ile oa tšehetsoa ke thuso ea Early Career Faculty ho tsoa ho NASA's Space Technology Research Grants Program (ECF 80NSSC18K1512), National Science Foundation ka UC San Diego Materials Research Science and Engineering Centre (MRSEC, DMR-2011924), le Ofisi ea Mahlale a Likoloi a Lefapha la Matla la US ka Lenaneo la Advanced Battery Materials Research Program (Battery500 Consortium, konteraka DE-EE0007764).Mosebetsi ona o ile oa etsoa ka karolo e itseng ho San Diego Nanotechnology Infrastructure (SDNI) ho UC San Diego, setho sa National Nanotechnology Coordinated Infrastructure, e tšehetsoeng ke National Science Foundation (faho ea ECCS-1542148).
Nako ea poso: Aug-10-2022