Pab neeg tshawb fawb ntawm Li Mingtao los ntawm Lub Tsev Kawm Ntawv ntawm Tshuaj Engineering ntawm Xi’an Jiaotong University tau ua tiav hauv kev siv cov roj teeb lithium-sulfur los ntawm kev tsim thiab tsim cov khoom siv cathode nrog ob txheej graphene tiv thaiv. Cov khoom siv cathode no muaj lub neej ntev.

2d intercalation G-C3N4 / graphene sandwich tsim ib tug multilayer shark net ntawm qhov zoo thiab tsis zoo electrodes ntawm lub roj teeb. Nws tuaj yeem tsis tsuas yog thaiv kev txav ntawm polysulfides ntawm qhov zoo thiab qhov tsis zoo electrodes los ntawm kev siv lub cev thiab tshuaj, tab sis kuj tseem ua kom lub zog ntawm lithium ions, yog li ua rau lub neej voj voog ntawm lub roj teeb.

Hauv kuv lub tebchaws, kev txhim kho cov roj teeb lithium-sulfur yog qhov qeeb, thiab nws tseem nyob rau hauv kev tshawb fawb thiab kev loj hlob theem, nrog rau ob peb cov kev siv tswv yim. Cov nyhuv shuttle tshwm sim los ntawm kev sib cais ntawm cov khoom nruab nrab ntawm lithium sulfide thaum lub sij hawm them thiab tshem tawm cov roj teeb lithium sulfur yog suav tias yog ib qho tseem ceeb ntawm kev txwv nws txoj kev siv.

Yav dhau los tus lwm thawj ntawm Qinghai Dr. Li Technician Technology ib zaug hais tias polysulfide yaj qhov chaw shuttle yog qhov teeb meem tseem ceeb tshaj plaws thiab nyuaj lithium-sulfur roj teeb, thiab lwm yam kev txhim kho kev ua haujlwm tseem nyob rau theem pib, tab sis nws zoo siab tias lithium-sulfur. cov roj teeb tuaj yeem siv los ua cov roj teeb thib ob. Nrog rau siab zog ceev, nws muaj kev loj hlob zeem muag.

Piv nrog rau tam sim no mainstream ternary NCM, theoretical tshwj xeeb lub zog ntawm sulfur cathode roj teeb yog siab li 2600Wh / kg, uas yog ntau tshaj kaum npaug ntawm cov tam sim no lug siv lithium roj teeb. Tsis tas li ntawd, sulfur reserves muaj ntau thiab pheej yig, uas yuav pab txo tus nqi ntawm cov tsheb fais fab uas siv los ntawm lithium roj teeb.

Hauv xyoo 2016, National Development thiab Reform Commission tau thov kom muaj kev ua tiav ntawm lithium-sulfur roj teeb thev naus laus zis nrog lub zog ntom ntom ntawm 300Wh / kg hauv “Lub Zog Technology Revolution thiab Innovation Action Plan (2016-2030)”.

Nyob rau hauv qhov sib piv, raws li Kev Ntsuas Kev Ntsuas los Txhawb Kev Txhim Kho Kev Lag Luam Automotive Fais Fab Kev Lag Luam thiab Kev Txhim Kho Nruab Nrab thiab Lub Sijhawm Ntev rau Kev Lag Luam Automotive tso tawm xyoo 2017, ib leeg-tshuab piv tuaj yeem ncav cuag ntau dua 300Wh / kg los ntawm 2020, thiab qhov piv ntawm ib lub tshuab tuaj yeem ncav cuag 500Wh los ntawm 2025. / kg saum toj no. Lub zog theoretical zog ceev ntawm lithium-sulfur roj teeb yog ntau dua 500Wh / kg, yog li nws raug suav tias yog kev txhim kho ntawm cov tiam tom ntej ntawm cov roj teeb lithium roj teeb tom qab lithium roj teeb.

Txhawm rau daws cov teeb meem kev ua tau zoo hauv kev siv cov roj teeb lithium-sulfur, suav nrog Qian Hanlin pab pawg ntawm University of Science thiab Technology ntawm Tuam Tshoj, pab pawg Wang Haihui ntawm South China University of Technology, Qingdao Zog thiab Lub Zog Cia Khoom Advanced Pab neeg tshawb fawb Technology ntawm Suav Academy ntawm Kev Tshawb Fawb, peb pab pawg Xiamen University Chemical Nan Fengzheng thiab Shanghai Jiaotong University Wang pab pawg tshawb fawb tau ua tiav kev vam meej.

Thaum Lub Kaum Hli 2018, Xib Fwb Wang, Yitaiqian thiab ntau lub University of Science thiab Technology ntawm Tuam Tshoj (University of Science thiab Technology) pom tias qhov kev ua tau zoo ntawm p-band chaw nruab nrab txoj hauj lwm ntawm valence electrons txheeb ze rau qib Fermi yog ib qho tseem ceeb hauv li. -S roj teeb Interface electron hloov cov tshuaj tiv thaiv. Cov kws tshawb fawb tau pom tias cov khoom siv cobalt-based sulfur-carrying nrog qhov tsawg tshaj plaws zoo polarization thiab qhov kev ua tau zoo tshaj plaws muaj peev xwm ntawm 417.3 Mahg-1 txawm nyob ntawm 40.0 ° C, uas sib haum rau tam sim no lub zog siab tshaj plaws ntawm 137.3 kwkg-1. Cov txiaj ntsig kev tshawb fawb tau luam tawm hauv “Joule”, ib phau ntawv xov xwm thoob ntiaj teb ntawm cov khoom siv hluav taws xob zoo heev.

Lithium-sulfur roj teeb yog hlau lithium roj teeb zoo roj teeb uas muaj leej faj ua cov electrode zoo. Txhawm rau daws qhov teeb meem kev nyab xeeb ntawm Li dendrites uas tsim nyob rau hauv cov hlau zoo electrode ntawm Shanghai Jiaotong University, Wang pab neeg tau npaj ib yam tshiab ntawm lithium roj teeb electrolyte tov (siv ob lithium fluorosulfonimide yaj nyob rau hauv triethyl phosphate thiab siab flash point fluoroether kom tau saturated electrolyte) . Piv nrog rau cov high-concentration electrolyte, cov electrolyte tshiab muaj tus nqi qis thiab qis viscosity, txhim khu kev tiv thaiv ntawm cov hlau Li electrode, tuaj yeem tshem tawm cov dendrites ntawm Li electrode, thiab tshem tawm cov kev phom sij ntawm kev nyab xeeb. Nyob rau tib lub sijhawm, kev nyab xeeb thiab kev ua haujlwm ntawm electrochemical tau txhim kho nyob rau hauv qhov kub thiab txias siab tshaj 60 ° C.

Ntxiv nrog rau kev tshawb fawb tshawb fawb, cov tuam txhab roj teeb kuj tseem siv cov roj teeb lithium-sulfur ua ib qho ntawm lawv cov peev txheej, ua kom muaj kev xav tau kev ua haujlwm zoo. Ntawm cov tuam txhab teev npe no, Tuam Tshoj Nuclear Titanium Dioxide, Tibet Kev Lag Luam Hauv Nroog, Jinlu Group, Guoxun High-tech, Npau Suav Vision Technology thiab lwm lub tuam txhab tau siv cov roj teeb lithium-sulfur.

Txawm hais tias cov roj teeb lithium-sulfur muaj qee qhov teeb meem hauv cov txheej txheem ntawm kev ua tiav lub zog zoo tagnrho, muaj cov kev xav tau ntau dua rau kev ua kom nyias nyias ntawm qee qhov kev siv roj teeb, xws li tsheb tsis muaj neeg tsav tsheb (UAV), submarines, thiab tub rog nqa hnab. Rau cov khoom siv hluav taws xob rau lwm lub hom phiaj, txij li qhov hnyav yog qhov tseem ceeb tshaj li tus nqi lossis lub neej, cov roj teeb lithium-sulfur tau pib muab tso rau hauv kev siv. Lub roj teeb lithium-sulfur tshiab tsim los ntawm British start-up tuam txhab Oxis Zog tuaj yeem khaws yuav luag ob npaug ntawm lub zog ib kilogram ntawm lithium roj teeb tam sim no siv hauv tsheb hluav taws xob. Txawm li cas los xij, lawv tsis tuaj yeem nyob ntev thiab yuav ua tsis tiav tom qab kwv yees li 100 lub voj voog tawm. Lub hom phiaj ntawm Oxis cov nroj tsuag me me yog tsim kom muaj 10,000 txog 20,000 roj teeb ib xyoos. Nws tau hais tias lub roj teeb tau ntim rau hauv lub hnab nyias nyias qhov loj ntawm lub xov tooj ntawm tes. Vim li cas peb thiaj li yuav tsum txhawb kev tsim kho thiab rov ua dua tshiab ntawm cov roj teeb lithium kom sai li sai tau? Txawm hais tias kuv lub teb chaws cov peev txheej lithium nyob rau qib plaub hauv ntiaj teb, vim tias qib tsis zoo ntawm lithium ore, qhov nyuaj ntawm kev ua kom huv, thiab tus nqi siab, ntau cov lithium ore raug xa tawm txhua xyoo, thiab qib ntawm kev vam meej txawv teb chaws tshaj 85%. . Tsis tas li ntawd, Suav xav tau kuj tau tsav tus nqi roj teeb-qib lithium carbonate soaring. Nyob rau hauv xyoo tas los no, tus nqi tau nce ze li peb zaug, uas tau nce tus nqi ntawm cov khoom lag luam hauv Suav teb lithium roj teeb. Ntawm qhov tod tes, kev tshem tawm cov roj teeb lithium yog qhov muaj nuj nqis “hauv nroog kuv”. Cov ntsiab lus hlau yog ntau dua li cov ore, lithium, cobalt, npib tsib xee thiab lwm yam hlau zoo nkauj. Kev rov ua dua tshiab thiab rov ua dua tshiab tuaj yeem txhim kho kev siv cov peev txheej, txo qis kev xa tawm, thiab txo qis sab nraud nyob ntawm thiab tiv thaiv kev ruaj ntseg ntawm lub teb chaws cov peev txheej zoo. Zhang Tianren tau hais tias, ntawm qhov tod tes, los ntawm kev xav ntawm kev tiv thaiv kev ua qias tuaj thiab tiv thaiv ib puag ncig, yog tias cov roj teeb lithium pov tseg tsis raug pov tseg, lawv kuj yuav ua rau muaj kev puas tsuaj loj rau thaj chaw ecological.

Txhawm rau txhim kho kev rov qab zoo dua thiab rov siv cov roj teeb lithium rau lub zog tshiab, tiv thaiv ib puag ncig ecological, thiab ua kom muaj kev nyab xeeb ntawm lub teb chaws cov peev txheej, muaj peb qhov teeb meem tseem ceeb: qhov tsis zoo ntawm cov khoom siv rov ua dua tshiab, kev siv tshuab tsis paub tab, thiab tsis muaj zog. kev txhawb zog mechanism. Ntau yam tau tso tawm cov lus qhia los txhawb kev noj qab haus huv thiab kev loj hlob ntawm kuv lub teb chaws lub zog tshiab kev lag luam tsheb.

Kev ua kom nrawm ntawm kev tsim cov qauv thiab kev sib koom ua ke ntawm cov qauv kev tswj hwm yog lub hauv paus rau kev ua haujlwm cuam tshuam. Nws tau hais tias cov tuam haujlwm muaj feem cuam tshuam nrawm rau kev tsim cov qauv kev tswj hwm, cov qauv kev tshaj lij thiab cov qauv ntsuas kev ntsuas rau kev rov ua dua tshiab thiab rov siv cov roj teeb siv dua. Txhawb cov cheeb tsam uas muaj kev lag luam zoo los tsim cov kev saib xyuas lub zog tshiab lithium roj teeb, rov qab ua dua, thiab rov ua dua cov phiaj xwm thiab kev siv cov kev ntsuas, thiab dhau los ntawm cov kws tsav dav hlau ua ntej, tshawb nrhiav cov kev ntsuas hauv lub tebchaws uas muaj ntau dua nyob rau hauv kev lag luam tiag tiag thiab ua haujlwm tau zoo dua.