Txoj kev tswj hwm uas muaj nqi tsawg rau kev siv VAE Copolymers

Yog li cas VAE Copolymers tuaj yeem muaj kev tshuaj xyuas zoo dua rau qhov tsoo ntau nyob rau hauv kev kho cov cuab yeej

Qhov tsoo ntau ntawm cov khoom siv rau kev kho vs. PVDF thiab CMC/SBR systems

Kuam txawj ntse ntawm kev tshem tawm cov khoom sib tw zoo tshaj plaws (PVDF) los sis cov khoom sib tw CMC/SBR rau VAE copolymers yuav pab txhawm rau txo qhov nqi ntawm cov khoom nyob rau hauv 15 hli rau 20 hli vim tias lawv xav tau cov polymer tsawg dua rau txhua lub zog ntawm lub electrode. Qhov sib txawv loj tshaj plaws ntawm no yog PVDF xav tau N-Methyl-2-pyrrolidone (NMP) uas yog cov solvent uas muaj nqi siab thiab muaj txoj kev nyab xaiv. Vim tias VAE yog cov solvent uas muaj dej, nws pab cov tuam tshab txo qhov nqi ntawm kev xaiv, kev kho, thiab kev tshem tawm cov solvent uas muaj txoj kev nyab xaiv. Qhov tshwj xeeb lwm tus yog kev paub tseg rau cov kev cuam tshuam ntawm qhov nqi PVDF uas cuam tshuam los ntawm qhov muaj fluorine tsawg thiab cov lus qhia txog kev siv cov khoom uas muaj fluorine uas yog qhov txaus siab dua. Cov tuam tshab uas tsim 5 gigawatt hour ntawm kev tsim khoom tau pom tias lawv tau txo qhov nqi ntawm cov khoom thiab kev xa khoom rau 740,000 dollars ib tug xyoo tom qab lawv tshem tawm PVDF raws li cov kev saib xyuas ntawm Ponemon nyob rau hauv 2023.

Txo qhov siv hluav tais es los ntawm kev tsim khoom uas muaj dej thiab txo qhov ceev ntawm kev suav

Txoj kev siv hmoov uas siv nyob rau VAE ua rau qhov xav tau hluav tais (thermal energy) txog 40% nyob rau hauv kev siv hmoov uas siv lub tshuab (solvent based systems). Qhov kev suav (drying process) yog nyob rau hauv 80 thiab 90 degrees Celsius, uas yog 50 thiab 60 degrees ntsaum ntxiv yam uas xav tau rau NMP evaporation nyob rau PVDF applications. Qhov hloov ntawm degrees no muaj kev cuam tshuam ntau rau kev siv electricity thiab gas nyob rau qhov kev suav (curing stage). Qhov kev tshem tawm NMP recovery equipment kuj ua rau muaj kev sau energy vim tsis muaj kev xav tau rau cov solvent distillation towers uas tseem ceeb tshaj plaws yog 25 thiab 30 kilowatt hours per cubic meter. Cov lus nug uas xyuas rau lub neej thaum lub sijhawm (life cycle) qhia tias cov kev sau energy no txhua yam ua rau qhov kev sau energy rau txhua kilowatt hour ntawm kev tsim battery txog 18%. Qhov zoo tshaj plaws yog tias qhov no tsis cuam tshuam rau qhov quality raws li electrode density thiab qhov kev nyooj qhov kev nyooj ntawm cov khoom.

VAE Binder Qhia Dab Tsi: Sib Twv Lub Tswv Yim ntawm Electrochemical Stability thiab Cycle Life

Qhov ntau ntau ntawm qhov ntau (>)92% tom qab 200 zaug) nyob rau hauv NMC622/Li half-cells

VAE copolymers muaj kev pab zoo heev uas muaj 92% ntawm qhov capacity retention thaum muaj 200 charge-discharge cycles rau NMC622/Li half cells. Qhov no yog li 8 rau 12 percentage points zoo dua li qhov peb yuav pom rau cov binder materials tshwj xeeb. Qhov kev pab zoo no yog los ntawm qhov VAE copolymers yog qhov muaj kev tso cua zoo thiab muaj kev nyuaj ntsuag zoo rau cov active material particles, thiab qhov no pab tso cov particles hauv kev sib txuas thiab tsis tau tso cua tawm thaum muaj lithium insertion thiab extraction cycles. Qhov uas tshem VAE tshiab yog nws qhov elastic nature, uas tuaj yeem tiv taus qhov volume expansion thiab contraction rau 7% rau cov nickel-manganese-cobalt oxide cathodes uas muaj kev tswv yim loj thiab tsis tau tiv taus kev sib txuas rau hauv electrical connections. Cov lus tshuaj xyuas los ntawm lwm tus pheej yig tau pab tso cua tias energy densities yog 720 Wh/L lossis siab dua rau 0.5C rates. Txiav txim rau cov standard PVDF bound NMC622 electrodes uas kev pab yog 15-20% nqis thaum 150 cycles rau cov kev tshuaj xyuas zoo ib yam.

Kwv tij txog kev kawm SEI thiab kev ntxiv ntawm kev txaus rau hauv qhov chaw sib sau tau pom los ntawm EIS

Khiav cov lus qhia ntawm kev siv electrochemical impedance spectroscopy (EIS) pom tias cov electrodes uas muaj VAE nyob hauv no muaj qhov tsi zoo. Cov khoom no ua tau cov duab cim ntawm solid-electrolyte interphase (SEI) uas nyob hauv qhov tseem ceeb thiab tsis ntau heev, vim tias cov resistance ntawm interface yog ib txwm ntau los rau hauv 5 ohm-cm squared tom qab 100 cycles. Qhov no yog ib yam li 40% zoo dua li cov PVDF systems. Ces yog dab tsi ua rau qhov no dhau? Nws seem tias cov hydroxyl groups hauv VAE muaj qhov cuab yeej loj rau qhov no. Lawv pab ua tau cov lithium ions nyob hauv qhov tseem ceeb thiab tshem tawm cov localized breakdowns hauv electrolyte uas yuav ua rau muaj dendrites. Ib qho yam zoo dua los ntawm VAE yog nws cov oxidation potential uas ntau dua 3.8 volts thaum sib piv rau lithium. Qhov no pab tshem tawm cov side reactions uas tsis xav tau, yog li cov charge transfer resistance tsis ntau dua 25 ohm-cm squared, tias thaum muaj 300 cycles. Thaum cov neeg tshawb nrhiav xyuas cov cross sections los ntawm scanning electron microscopy (SEM), lawv pom tias cov SEI layers yog ntau dua thiab zoo dua. Thiab puas muaj qhov tsi zoo? Cov kev pom ntawm qhov tseem ceeb no sib khaub rau qhov tseem ceeb ntawm high capacity retention uas peb tau pom hauv kev tshawb nrhiav.

Kev Taug Kev Ntseeg thiab Kev Taug Kev Tswj Hwm ntawm VAE-Bound Electrodes

Kev Taug Kev Ntseeg Zoo Heev ntawm kev Taug Kev (>5,000 flex cycles) uas pab ua kev Taug Kev ntawm lub tshuab tso cua

VAE binders muab cov khoom no cov kev ntseeg zoo heev. Cov lus test qhia tias cov electrodes tuaj yeem taugev ntau zaug — nyob rau hauv 5,000 zaug los sis — tsis txhob lossis kawg cov kev sib txuas los sis. Vim li no lawv yog zoo rau kev tshuab tso cua uas tuaj yeem taugev. Xav txog cov khoom uas tuaj yeem siv rau hauv qhov cua, cov lus screen uas tuaj yeem taugev, thiab cov lus phone uas tuaj yeem taugev, uas cov electrodes uas sib txuas los sis PVDF yuav taugev lossis kawg cov kev sib txuas tom qab taugev ntau zaug. Qhov uas VAE nyob ib leeg yog qhov lawv nyob zoo heev thaum taugev ntau zaug. Cov khoom nyob zoo dua vim li no cov kev sib txuas nyob zoo dua thaum taugev ntau zaug, uas yog qhov txaus nyob rau cov khoom uas tau siv hauv kev sib txuas thiab taugev hauv kev sib txuas.

Kev tshem tawm ntawm NMP recovery infrastructure cuam tshuam rau CAPEX los sis ~35%

Qhov kev siv lub tshuab uas VAE siv yog qhov tso cia rau kev tswj hwm cov NMP recovery systems uas ob tug yuav tsum siv rau 35% ntawm cov lus uas cov thawj nyiaj siv rau kev kawm cov khoom sib xyaw. Thiab tsis yog tso cia rau kev npaj nyiaj xwb, tso cia rau kev tswj hwm cov kev ua haujlwm ntau yam. Tsis muaj kev txhawb nqa rau kev tswj hwm cov kev tswj hwm solvent emissions, tsis xav tau cov khoom sib xyaw uas muaj qhov tswj hwm rau kev tswj hwm kev tswj hwm kev tswj hwm, thiab tsis muaj kev tswj hwm rau kev tswj hwm cov vacuum distillation units. Thaum sib npaug nrog qhov tias cov khoom tuaj yeem sov rau qhov ceev ntau dua, cov thawj nyiaj tuaj yeem muaj cov khoom sib xyaw uas muaj qhov tswj hwm ntau dua thiab safety dua rau kev siv. Cov khoom sib xyaw no tuaj yeem siv tau ntau dua, ua rau cov thawj nyiaj tuaj yeem siv tau ntau dua thiab tsis muaj kev tswj hwm rau kev tswj hwm cov slurry stability thiab cov coatings zoo tshaj plaws.

Kev siv tau ntau dua: Tswj hwm qhov paradox ntawm VAE Molecular Weight Yield

Kuam txawj ntse ntawm kev txhawb nqa cov molecular weight distribution yog qhov tshwj xeeb heev thaum kawm ua VAE copolymer. Cov molecular weight zoo dua yuav pab paub zoo dua rau kev nyhaum, tab sis lawv muaj qhov tsis zoo. Thaum cov solution tau ua ntev dua, nws yuav pab los ua rau cov slurry tsis zoo, kev coating tsis zoo, thiab thaum tom qab yuav pab los ua rau cov electrode tsis tau zoo. Ntawd yog qhov kev tswj hwm tseem ceeb uas yuav tsum tau suav nrog qhov tswj hwm zoo. Yog tias cov molecular weight tau ua ntev dua, cov khoom yuav tsis tau zoo rau kev tswj hwm mechanical. Thaum cov viscosity zoo dua, nws yuav pab los ua rau cov thin film tsis tau zoo, thiab yuav pab los ua rau cov khoom muaj qhov tsis zoo li cov pinholes lossis cov clumps. Cov thawj coj ntawm lub hom phiaj ua cov khoom no yuav tswj hwm cov polymerization process los ua rau cov molecular weight zoo dua. Lawv yuav tswj hwm cov monomers uas lawv sau rau hauv system thiab cov initiator concentrations uas lawv siv. Cov kev tswj hwm no yuav pab los ua rau cov molecular weight zoo dua thiab tsis tshwj xeeb heev. Qhov uas tau? Cov viscosity yuav tsis txav ntau dua 10% thaum ua cov production runs. Qhov no txhais tau tias cov electrode yuav muaj qhov thickness zoo ib yam rau hauv 1.5 micrometers, thiab peb yuav pom cov khoom tsis zoo ntau dua. Thiab peb yuav paub tias cov films zoo dua yuav pab los ua rau cov cell assembly tau zoo dua thiab kev tswj hwm cov process tau zoo dua.

FAQ

Yog li cas VAE copolymers yog tsawg dua los ntawm qhov tshwm sim rau cov ntaub?

VAE copolymers yog tsawg dua los ntawm qhov tshwm sim rau cov ntaub vim tias lawv xav tau cov polymer tsawg dua rau maub txhua lub rooj thiab lawv yog hauv daim duab ntawm dej, thiab tsis xav tau cov solvent N-Methyl-2-pyrrolidone uas muaj ntau tshaj plaws thiab muaj kev puas tsuaj.

VAE copolymers ua li cas rau kev siv hluav tais tes nyob rau hauv kev tsim lub rooj thiab?

VAE copolymers ua kom kev siv hluav tais tes pom zoo dua 40% vim compared to traditional solvent-based systems los ntawm qhov ceev ntawm kev tsim thiab tsis xav tau cov khoom siv rau kev tshem tawm NMP.

Yog li cas yog qhov kev tswj hluav tais tes ntawm VAE copolymers?

VAE copolymers muaj qhov kev tswj hluav tais tes zoo dua 92% tom qab 200 zaug ntawm kev ntxuav thiab kev ntxuav pauv nyob rau hauv NMC622/Li half-cells, thiab zoo dua cov khoom siv rau kev tswj hluav tais tes uas tau siv ntau.

VAE ua li cas rau kev tswj hluav tais tes nyob rau hauv lub rooj thiab SEI?

VAE ua kom zoo dua rau kev tswj hluav tais tes los ntawm kev tsim lub rooj SEI uas zoo dua thiab muaj qhov kev ceev ntawm kev tswj hluav tais tes tsawg dua, vim tias lawv muaj cov hydroxyl groups thiab muaj qhov oxidation potential tsawg dua.