Muaj ntau yam kev qhia ntawm graphite anode cov ntaub ntawv, thiab nws yog ib qho nyuaj rau coj mus rau hauv tus account, feem ntau nrog rau cov cheeb tsam tshwj xeeb, particle loj tis, kais ceev, compaction ceev, muaj tseeb ceev, thawj nqi thiab tso tawm tej peev xwm, thawj efficiency, thiab lwm yam. Tsis tas li ntawd, muaj cov ntsuas hluav taws xob xws li kev ua haujlwm ntawm lub voj voog, qhov ua tau zoo, qhov o, thiab lwm yam.Yog li, dab tsi yog qhov ntsuas kev ua haujlwm ntawm graphite anode cov ntaub ntawv?Cov ntsiab lus hauv qab no yog qhia rau koj los ntawm HCMilling (Guilin Hongcheng), cov chaw tsim khoomcov khoom siv anode sib tsoo zeb.

01 thaj chaw tshwj xeeb

Hais txog thaj tsam ntawm ib qho khoom ib chav tsev loj.Qhov me me, qhov loj ntawm qhov chaw tshwj xeeb.

Qhov tsis zoo electrode nrog cov khoom me me thiab qhov chaw siab tshwj xeeb muaj ntau txoj hauv kev thiab txoj hauv kev luv dua rau lithium ion tsiv teb tsaws, thiab tus nqi ua tau zoo dua.Txawm li cas los xij, vim yog thaj chaw loj ntawm kev sib cuag nrog cov electrolyte, thaj tsam rau kev tsim cov yeeb yaj kiab SEI kuj loj, thiab qhov kev ua haujlwm pib yuav qis dua..Cov khoom loj dua, ntawm qhov tod tes, muaj qhov zoo dua ntawm kev sib khi ntau dua.

Qhov chaw tshwj xeeb ntawm cov khoom siv graphite anode yog qhov zoo dua tsawg dua 5m2 / g.

02 Particle loj faib

Kev cuam tshuam ntawm qhov loj me ntawm cov khoom siv graphite anode ntawm nws cov khoom siv hluav taws xob yog tias qhov loj me ntawm cov khoom siv anode yuav cuam tshuam ncaj qha rau cov kais dej ntom ntom ntawm cov khoom thiab thaj chaw tshwj xeeb ntawm cov khoom.

Qhov loj ntawm tus kais ntom ntom yuav cuam tshuam ncaj qha rau lub ntim lub zog ntom ntom ntawm cov khoom, thiab tsuas yog qhov tsim nyog particle loj faib ntawm cov khoom tuaj yeem ua rau qhov ua tau zoo ntawm cov khoom siv.

03 Coj mus rhaub ceev

Lub kais ntom ntom yog qhov loj ntawm ib chav tsev ntim ntsuas los ntawm kev co uas ua rau cov hmoov tshwm nyob rau hauv ib daim ntawv nruj heev.Nws yog ib qho tseem ceeb qhia los ntsuas cov khoom siv.Lub ntim ntawm lithium-ion roj teeb yog txwv.Yog tias tus kais ceev ceev yog qhov siab, cov khoom siv nquag rau ib chav ntim muaj ib pawg loj, thiab cov ntim muaj peev xwm loj.

04 Compaction ceev

Lub compaction ceev yog tsuas yog rau cov ncej, uas yog hais txog qhov ceev tom qab dov tom qab cov khoom tsis zoo electrode active khoom thiab cov binder yog tsim rau hauv cov ncej, compaction ntom = thaj tsam ntom / (lub thickness ntawm tus ncej tom qab dov rho tawm. thickness ntawm tooj liab ntawv ci).

Lub compaction ceev yog ze ze rau daim ntawv tshwj xeeb muaj peev xwm, efficiency, internal kuj thiab roj teeb lub voj voog kev ua tau zoo.

Kev cuam tshuam cov yam ntxwv ntawm compaction ceev: particle loj, faib thiab morphology tag nrho muaj cov nyhuv.

05 Muaj tseeb tiag

Qhov hnyav ntawm cov khoom ib chav tsev ntim ntawm cov khoom nyob rau hauv ib tug kiag li ntom (tsis suav nrog internal voids).

Txij li qhov tseeb qhov ceev yog ntsuas nyob rau hauv lub xeev compacted, nws yuav siab tshaj qhov tapped ceev.Feem ntau, qhov tseeb qhov ceev> compacted ntom> tapped ntom.

06 Thawj tus nqi thiab tso tawm muaj peev xwm

Cov khoom siv graphite anode muaj peev xwm hloov tsis tau nyob rau hauv thawj zaug them-tso tawm voj voog.Thaum lub sij hawm thawj zaug them cov txheej txheem ntawm lithium-ion roj teeb, qhov saum npoo ntawm cov khoom siv anode yog intercalated nrog lithium ions thiab cov kuab tshuaj molecules hauv cov electrolyte yog co-ntxig, thiab qhov saum npoo ntawm cov khoom siv anode decomposes los ua SEI.Passivation zaj duab xis.Tsuas yog tom qab qhov tsis zoo electrode nto tau them tag nrho los ntawm SEI zaj duab xis, cov kuab tshuaj molecules tsis tuaj yeem cuam tshuam, thiab cov tshuaj tiv thaiv tau nres.Lub cim ntawm SEI zaj duab xis siv ib feem ntawm lithium ions, thiab ib feem ntawm lithium ions tsis tuaj yeem muab rho tawm los ntawm qhov chaw ntawm qhov tsis zoo electrode thaum lub sij hawm tso tawm, yog li ua rau irreversible peev xwm poob, yog li txo lub peev xwm ntawm thawj paug.

07 Thawj Coulomb Efficiency

Qhov taw qhia tseem ceeb rau kev ntsuas qhov kev ua tau zoo ntawm cov khoom siv anode yog nws thawj qhov kev ua haujlwm tawm-tso tawm, tseem hu ua thawj Coulomb efficiency.Thawj zaug, Coulombic efficiency ncaj qha txiav txim siab qhov ua tau zoo ntawm cov khoom siv electrode.

Txij li thaum SEI zaj duab xis feem ntau yog tsim nyob rau saum npoo ntawm cov khoom siv electrode, thaj chaw tshwj xeeb ntawm cov khoom siv electrode ncaj qha cuam tshuam rau thaj tsam tsim ntawm SEI zaj duab xis.Qhov loj dua ntawm qhov chaw tshwj xeeb, qhov loj dua qhov chaw sib cuag nrog cov electrolyte thiab qhov loj dua qhov chaw rau kev tsim SEI zaj duab xis.

Nws feem ntau ntseeg tau tias kev tsim cov yeeb yaj kiab SEI ruaj khov yog qhov zoo rau kev them nyiaj thiab tawm ntawm lub roj teeb, thiab qhov tsis ruaj khov SEI zaj duab xis yog qhov tsis zoo rau cov tshuaj tiv thaiv, uas yuav txuas ntxiv haus cov electrolyte, thicken lub thickness ntawm SEI zaj duab xis, thiab nce lub internal kuj.

08 Lub voj voog ua haujlwm

Lub voj voog kev ua haujlwm ntawm lub roj teeb hais txog tus lej ntawm cov nqi them thiab kev tso tawm uas lub roj teeb tau ntsib nyob rau hauv ib qho kev them nqi thiab kev tso tawm tawm thaum lub roj teeb muaj peev xwm poob mus rau tus nqi teev.Hais txog kev ua haujlwm ntawm lub voj voog, SEI zaj duab xis yuav cuam tshuam qhov kev nthuav tawm ntawm lithium ions mus rau qee yam.Raws li tus naj npawb ntawm cov voj voog nce, SEI zaj duab xis tseem yuav poob tawm, tev tawm, thiab tso nyiaj rau ntawm qhov chaw ntawm qhov tsis zoo electrode, uas ua rau maj mam nce ntxiv hauv qhov tsis zoo ntawm cov electrode, uas ua rau muaj cua sov thiab muaj peev xwm poob. .

09 Kev nthuav dav

Muaj kev sib raug zoo ntawm kev nthuav dav thiab lub voj voog lub neej.Tom qab qhov tsis zoo electrode nthuav dav, thawj zaug, cov tub ntxhais winding yuav raug deformed, cov khoom tsis zoo electrode yuav tsim microcracks, SEI zaj duab xis yuav tawg thiab reorganized, cov electrolyte yuav tau noj, thiab lub voj voog kev ua haujlwm yuav deteriorated;thib ob, lub diaphragm yuav raug nyem.Kev kub siab, tshwj xeeb tshaj yog extrusion ntawm lub diaphragm ntawm txoj cai-lub kaum sab xis ntawm lub pob ntseg pob ntseg, yog qhov hnyav heev, thiab nws yooj yim ua rau micro-short circuit lossis micro-hlau lithium nag lossis daus nrog kev nce qib ntawm lub voj voog hluav taws xob.

Raws li kev nthuav dav nws tus kheej muaj kev txhawj xeeb, lithium ions yuav muab tso rau hauv graphite interlayer spacing thaum lub sij hawm graphite intercalation txheej txheem, ua rau muaj kev nthuav dav ntawm interlayer spacing thiab nce ntim.Qhov kev nthuav qhia no yog irreversible.Tus nqi ntawm kev nthuav dav yog cuam tshuam rau qib ntawm kev taw qhia ntawm qhov tsis zoo electrode, qib kev taw qhia = I004 / I110, uas tuaj yeem suav los ntawm XRD cov ntaub ntawv.Cov khoom siv anisotropic graphite nyhav dhau los ua lattice expansion nyob rau hauv tib qho kev taw qhia (C-axis kev taw qhia ntawm graphite siv lead ua) thaum lub sij hawm lithium intercalation txheej txheem, uas yuav ua rau ib tug loj ntim expansion ntawm lub roj teeb.

10Rate kev ua tau zoo

Lub diffusion ntawm lithium ions nyob rau hauv graphite anode cov ntaub ntawv muaj ib tug muaj zog directionality, uas yog, nws tsuas yog muab tso rau perpendicular mus rau lub kawg lub ntsej muag ntawm C-axis ntawm graphite siv lead ua.Cov khoom siv anode nrog cov khoom me me thiab qhov tshwj xeeb ntawm thaj chaw muaj qhov ua tau zoo dua.Tsis tas li ntawd, electrode nto kuj (vim SEI zaj duab xis) thiab electrode conductivity kuj cuam tshuam rau tus nqi kev ua tau zoo.

Ib yam li lub voj voog lub neej thiab kev nthuav dav, lub isotropic tsis zoo electrode muaj ntau lithium ion thauj raws, uas daws cov teeb meem ntawm kev nkag tsawg dua thiab qis diffusion tus nqi hauv cov qauv anisotropic.Feem ntau ntawm cov ntaub ntawv siv thev naus laus zis xws li granulation thiab txheej txheej los txhim kho lawv qhov kev ua tau zoo.

HCMilling (Guilin Hongcheng) yog cov chaw tsim khoom ntawm anode cov ntaub ntawv sib tsoo zeb.HLMX seriescov khoom siv anode super- zoo ntsug zeb, HCHcov khoom siv anode ultra-zoo zebthiab lwm yam graphite sib tsoo zeb ua los ntawm peb tau dav siv nyob rau hauv zus tau tej cov graphite anode cov ntaub ntawv.Yog tias koj muaj kev xav tau, thov hu rau peb kom paub meej cov khoom siv thiab muab cov ntaub ntawv ua raws li peb:

Raw khoom npe

Cov khoom zoo (mesh / μm)

muaj peev xwm (t / h)