Lithium roj teeb anode cov ntaub ntawv thiab lub neej yav tom ntej
Lithium-ion roj teeb yog lub roj teeb uas muaj peev xwm rov qab tau, uas feem ntau yog tsim los ntawm tsib qhov tseem ceeb: zoo electrode, tsis zoo electrode, electrolyte, separator thiab tam sim no collector.
Lub luag haujlwm tseem ceeb ntawm cov khoom siv hluav taws xob zoo thiab tsis zoo yog ua kom cov lithium ions ntau dua ywj pheej rho tawm / ntxig, kom paub txog kev ua haujlwm ntawm kev them nyiaj thiab tawm.
Thaum lub sijhawm them nyiaj, lithium ions raug rho tawm los ntawm cov khoom siv hluav taws xob zoo thiab muab tso rau hauv cov khoom siv tsis zoo electrode los ntawm electrolyte. Nyob rau tib lub sij hawm, electrons ntws tawm ntawm qhov zoo electrode los ntawm sab nraud Circuit Court thiab ntws mus rau qhov tsis zoo electrode;
Thaum lub roj teeb lithium raug tso tawm, lithium ions raug rho tawm los ntawm cov hluav taws xob tsis zoo thiab rov ua dua hauv cov khoom siv hluav taws xob zoo los ntawm electrolyte. Nyob rau tib lub sijhawm, electrons ntws los ntawm qhov tsis zoo electrode mus rau qhov zoo electrode los ntawm sab nraud Circuit Court.
Dab tsi yog cov khoom siv anode ntawm lithium roj teeb?
Cov khoom siv hluav taws xob tsis zoo yog cov khoom thauj ntawm lithium ions thiab cov khoom siv hluav taws xob hauv cov txheej txheem them roj teeb, thiab ua lub luag haujlwm ntawm lub zog cia thiab tso tawm. Nws yog ib qho tseem ceeb uas txiav txim siab qhov ua tau zoo ntawm cov roj teeb lithium-ion thiab tuav cov ntshav ntawm lub zog roj teeb kev nyab xeeb.
Cov khoom siv tsis zoo electrode yuav tsum muaj tsawg kawg yog 7 yam hauv qab no
1. Cov tshuaj muaj peev xwm tsawg, tsim muaj qhov sib txawv loj nrog cov khoom siv hluav taws xob zoo, yog li tau txais lub roj teeb muaj zog;
2. Nws yuav tsum muaj lub voj voog tshwj xeeb siab dua;
3. Li+ yuav tsum tau yooj yim ntxig thiab muab rho tawm hauv cov khoom siv hluav taws xob tsis zoo, thiab muaj kev ua haujlwm siab coulombic, kom thiaj li muaj peev xwm muaj peev xwm ruaj khov thiab tawm hluav taws xob thaum lub sijhawm Li+ cov txheej txheem rho tawm;
4. Zoo hluav taws xob conductivity thiab ion conductivity;
5. Nws muaj kev ruaj ntseg zoo thiab muaj qee qhov kev sib raug zoo nrog electrolytes;
7. Lub hauv paus ntawm cov ntaub ntawv yuav tsum muaj kev nplua nuj, tsis muaj nqi, yooj yim hauv kev tsim khoom; nyab xeeb, ntsuab thiab tsis muaj kuab paug.
Cov ntaub ntawv anode uas ua tau raws li cov xwm txheej saum toj no yeej tsis muaj nyob rau tam sim no, yog li kev tshawb fawb ntawm cov ntaub ntawv tshiab anode nrog lub zog ceev, kev nyab xeeb zoo, tus nqi qis, thiab cov khoom siv tau yooj yim tau dhau los ua haujlwm ceev, uas tseem yog lub ntsiab lus kub hauv kev tshawb fawb ntawm lithium roj teeb nyob rau theem no.
Kev tshawb nrhiav thiab yav tom ntej ntawm cov khoom siv anode rau cov roj teeb lithium
Graphene / Zirconium Hydrogen Phosphate (ZrP) cov khoom siv sib xyaw yog siv los ua cov khoom siv tsis zoo electrode ntawm lithium roj teeb, uas tuaj yeem kov yeej cov khoom siv roj teeb.
Cov teeb meem ntawm cov khoom siv hluav taws xob tsis zoo thiab qhov loj ntim nthuav dav muaj cov yam ntxwv ntawm lub voj voog ruaj khov thiab muaj zog hluav taws xob conductivity.
1. Lithium cia mechanism ntawm graphene / ZrP composites
1. Lithium cia tus cwj pwm ntawm graphene cov ntaub ntawv
Graphene muaj cov kab hluav taws xob zoo dua thiab ion kis tau tus mob, uas muaj txiaj ntsig zoo rau kev ua kom cov nqi them thiab tso tawm. Thaum graphene siv los ua cov khoom siv tsis zoo electrode, cov tshuaj tiv thaiv cov mis raws li hauv qab no:
Txawm hais tias graphene muaj qhov siab Li+ diffusion tus nqi thiab muaj lub peev xwm siab thaum thawj zaug thiab cov txheej txheem tawm thaum siv los ua cov khoom siv tsis zoo rau cov roj teeb lithium, lub peev xwm ntawm graphene yuav sai sai tom qab ob peb ua tiav thiab tawm mus. thiab siv tsis tau ib leeg. Cov khoom siv lithium roj teeb anode, qhov no yog vim tias cov khoom siv graphene yuav hnov mob nrog lub lithium roj teeb electrolyte thaum thawj zaug thiab tawm, thiab qhov chaw sib cuag nrog cov electrolyte yuav loj dua thaum lub voj voog hluav taws xob, uas yuav ua rau cov txheej txheem sib sau ua ke, ua rau muaj kev sib cuag nrog cov electrolyte. nyob rau hauv irreversibility thiab instability. Passivation ntawm SEI zaj duab xis, thaum npaj graphene yog ib qho yooj yim rau agglomerate thiab accumulates vim lub lamellar qauv, uas ua rau nws coulombic efficiency tsawg.
2. Synergistic nyhuv ntawm graphene/ZrP composite cov ntaub ntawv
Kev sib xyaw ntawm zirconium hydrogen phosphate thiab graphene tuaj yeem tsis tsuas yog txhim kho cov conductivity ntawm lub roj teeb thiab txhim kho nws qhov ntim nthuav dav, tab sis kuj muaj peev xwm cia lithium zoo thiab tuaj yeem ua kom muaj peev xwm ntawm cov khoom sib xyaw. Piv nrog rau lwm cov ntaub ntawv carbon, graphene muaj qhov zoo ntawm thaj chaw loj tshwj xeeb, muaj zog txhua yam, thiab hluav taws xob zoo. Kev tshawb fawb ntawm SnO 2, FeSb 2 thiab lwm yam ntaub ntawv tau qhia tias kev taw qhia ntawm graphene tuaj yeem txhim kho nws txoj kev ua haujlwm ntawm electrochemical.
2. Lub hauv paus ntsiab lus ua haujlwm ntawm graphene / ZrP composite
graphene / zirconium hydrogen phosphate composite khoom yog npaj los ntawm solvothermal txoj kev, uas yuav ua rau cov generated graphene adhere rau saum npoo ntawm zirconium hydrogen phosphate nyob rau hauv situ kom tau zirconium hydrogen phosphate thiab graphene composite khoom. Tom qab calcination, cov graphene tuaj yeem nyob rau hauv zirconium hydrogen phosphate Oxygen vacancies yog tsim nyob rau hauv cov siv lead ua lattice, yog li ua rau tus naj npawb ntawm cov cab kuj thiab lattice defects, thiab txhim kho conductivity. Lub xub ntiag ntawm graphene enables tsim ib tug conductive network ntawm zirconium hydrogen phosphate nanoparticles, uas yog zoo los txhim kho tag nrho cov conductivity ntawm cov khoom. Nyob rau tib lub sijhawm, graphene yog siv los ua cov yeeb yaj kiab hloov tau yooj yim los pleev xim rau saum npoo ntawm zirconium hydrogen phosphate, uas tuaj yeem cuam tshuam qhov ntim nthuav tawm thaum lub sijhawm them thiab tawm.
Thib peb, lub peev xwm zeem muag ntawm graphene / ZrP cov ntaub ntawv sib xyaw
1. Txoj kev npaj muaj cov yam ntxwv ntawm kev ua haujlwm yooj yim thiab yooj yim, muaj zog rov tsim dua tshiab, tsis muaj nqi thiab tsis muaj kuab paug rau ib puag ncig;
2. Cov khoom siv sib xyaw ntawm zirconium hydrogen phosphate thiab graphene npaj los ntawm txoj kev no yog siv los ua cov khoom siv tsis zoo ntawm cov roj teeb lithium, uas tuaj yeem kov yeej cov teeb meem ntawm cov roj teeb tsis zoo thiab cov txiaj ntsig loj ntawm kev nthuav dav, thiab muaj cov yam ntxwv ntawm lub voj voog ruaj khov. thiab muaj zog conductivity;
3. Vim tias graphene muaj cov khoom siv hluav taws xob zoo thiab thaj chaw loj, nws tuaj yeem txhim kho cov khoom siv roj teeb zoo, thiab tib lub sijhawm, txheej txheej ntawm graphene tuaj yeem txhim kho qhov ntim nthuav dav ntawm cov khoom siv roj teeb thiab txhim kho cov khoom siv hluav taws xob zoo. ntawm cov khoom siv roj teeb sib xyaw.
