Daim ntawv thov ntawm cov xim tej hub hauv lithium roj teeb

Lithium-ion roj teeb muaj qhov ua tau zoo xws li kev ua haujlwm siab, lub peev xwm loj, me me, lub teeb yuag, kev tiv thaiv ib puag ncig thiab lub neej ntev. Lawv tau siv dav hauv ntau yam khoom siv hluav taws xob txawb thiab hluav taws xob tsheb. Txawm li cas los xij, tseem muaj qee qhov teeb meem nyob rau hauv kev nyab xeeb ntawm cov roj teeb lithium-ion, tshwj xeeb tshaj yog lawv cov teeb meem kev nyab xeeb nyob rau hauv cov xwm txheej xws li qhov kub siab, overcharge, thiab luv Circuit Court, uas tau dhau los ua teeb meem kev kho mob uas yuav tsum tau kov yeej thaum lub hwj chim-hom lithium-ion roj teeb thov rau ntawm lub loj.

Tam sim no, ntau lub chaw tsim khoom siv cov roj teeb lithium siv cov hmoov sib xyaw ua ke los lo cov ncej tsis zoo los yog cov ceramic cais tawm thiab lwm cov ntaub ntawv muaj feem xyuam nrog" ceramic hmoov" txhawm rau txhim kho kev nyab xeeb ntawm cov roj teeb lithium. Qhov tseeb, ceramic hmoov tsis yog" ceramic" ;, tab sis nano-qhov loj me alumina hais. Nano alumina yog ib qho ntawm cov khoom siv tshwj xeeb nano nrog cov ntawv thov tseem ceeb thiab kev txhim kho kev cia siab. Nws muaj cov qauv ntawm cov yam ntxwv zoo xws li lub siab thermal stability, tshuaj lom neeg ruaj khov, tiv thaiv corrosion thiab siab hardness. Nws yog dav siv hauv cov ntaub ntawv ceramic thiab cov khoom siv roj ntsha. Cov ntaub ntawv kho mob, cov khoom siv hluav taws xob semiconductor, cov chaw nqa tawm, tiv thaiv txheej txheej saum npoo thiab cov khoom siv kho qhov muag. Nws yog qhov tseeb vim tias muaj cov thermal stability zoo uas nano-alumina tau txiav txim siab ua cov khoom zoo thermal rwb thaiv tsev thiab cia siab tias yuav ua rau muaj txiaj ntsig zoo rau kev txhim kho kev nyab xeeb ntawm cov roj teeb lithium-ion.

Tam sim no, nano-alumina feem ntau yog siv los pleev roj electrodes lossis diaphragms txhawm rau txhim kho kev nyab xeeb ntawm diaphragm thiab txo qhov luv luv ntawm cov hluav taws xob hauv.

1. Anode tej hub xim

Txog rau tam sim no, hmoov av ceramic feem ntau xyaw nrog CMC thiab yaj hauv dej deionized los tsim cov slurry. Lub slurry yog tom qab ntawd pleev xim rau ntawm cov ncej thooj, thiab lub xeev ntawm tus ncej nyob hauv qab SEM tom qab ziab yog pom hauv daim duab 1. Hauv cov duab (a) thiab (b) hauv daim duab 1, nws pom tseeb tias cov xeb txheej yog sib npaug. faib rau ntawm nplaim hluav taws xob tsis zoo nyob rau hauv daim ntawv ntawm hais. Cov nyhuv ntawm cov pa roj carbon txheej ntawm cov kev ua haujlwm ntawm cov roj teeb lithium yog raws li hauv qab no:

Daim duab 1. SEM ntawm ob yam ntawm cov tsis muaj qhov tsis zoo ncej daim hlau

1. Cov xim ua tiav tsis muaj tseeb pom muaj peev xwm ntawm lub peev xwm ntawm lub roj teeb lithium;

2. Ntxiv cov hmoov ceramic yuav ua rau kom muaj zog sab hauv ntawm cov roj teeb lithium. Qhov no yog vim tias qhov tseem ceeb ntawm cov kev ua tiav cov xim txheej yog Al2O3, uas tsis yog kev coj ua. Kev kho cov nplais hluav taws xob nyob rau saum npoo ntawm cov khoom siv tsis zoo electrode yuav cuam tshuam txoj kev ntawm cov hluav taws xob mus rau qhov tsis zoo electrode, yog li lub cev tsis kam ntawm lub roj teeb yuav nce ntxiv;

3. Lub voj voog ua tiav ntawm cov roj teeb cov roj ceramic zoo dua li cov roj teeb uas tsis muaj cov xim ua kua ceramic. Tsis tas li ntawd, los ntawm txheej txheej ceramic hmoov nyob rau saum npoo ntawm qhov tsis zoo electrode, los ntawm kev ua kom cov nyhuv passivation tsis zoo ntawm cov hluav taws xob tsis zoo thiab txhim kho cov hluav taws xob hluav taws xob, qhov tsis zoo ntawm cov hluav taws xob ua tau zoo ntawm lub roj teeb nyob hauv qhov kub cia qhov chaw yuav ua tau zoo suppressed. SEM tsom xam ntawm cov roj teeb ncej daim tom qab caij tsheb kauj vab yog muaj nyob hauv daim duab 2 pom.

Daim duab 2. SEM ntawm cov ncej tsis zoo tom qab ob lub voj voog

Nws tuaj yeem pom los ntawm daim duab hais tias cov nplaim hluav taws xob tsis zoo-cov xim coated cov hluav taws xob tsis zoo yog them nrog txheej txheej ntawm cov xaim hluav taws xob zoo, uas yog kwv yees tias yog qhov sib txuas ua ke los ntawm lithium deposition thaum lub sijhawm them thiab tawm txheej txheem, thaum lub nplaim ceramic coated tsis zoo electrode yog tus du thiab ceramic Tusyees faib nyob rau saum npoo ntawm ncej daim. Nws tuaj yeem suav tau tias qhov kev ua haujlwm ntawm lub roj teeb muaj feem cuam tshuam nrog cov xim txheej ceramic. Thaum lub sijhawm ua haujlwm ntawm lub roj teeb, cov yeeb yaj kiab tsis zoo SEI yuav loj hlob thiab ua tuab dua. Zaj yeeb yaj kiab dhau los ntawm SEI tuab yuav tsis tsuas haus ntau cov lithium ions, tab sis kuj tseem ua rau muaj lithium thaum them nyiaj. Ions tsis tuaj yeem txig tau zoo hauv cov electrode tsis zoo, tab sis ua rau nplaim hluav taws xob tsis zoo los sis rau saum npoo ntawm qhov chaw cais tawm, uas ua rau muaj peev xwm ploj thaum lub voj voog. Txheej txheej txheej ntawm cov nplais hluav taws xob cais ntawm cov nplaim hluav taws xob tsis zoo tuaj yeem tiv thaiv kev loj hlob ntawm qhov tsis zoo electrode SEI zaj duab xis, yog li txo cov poob ntawm lithium ions thaum lub voj voog. Tsis tas li ntawd, qhov hluav taws xob yuav txuas ntxiv mus rau lub sijhawm thaum lub roj teeb, thiab cov xim txheej ceramic muaj qee qhov muaj peev xwm nqus tau, uas tuaj yeem txhim kho qhov muaj peev xwm tuav tau cov roj hluav taws xob tsawg thaum lub sijhawm them ntev thiab tawm mus. Yog li ntawd, cov xim txheej ceramic tuaj yeem txhim kho qhov kev ua haujlwm ntawm lub zog ternary lithium-ion roj teeb.

4. Qhov kev nyab xeeb ntawm cov roj teeb coated ceramic yog siab dua qhov ntawm cov roj teeb uas tsis yog ceramic. Ob lub roj teeb sib txawv tau raug rau acupuncture thwmsim nyob hauv tib qho kev sim, thiab cov txiaj ntsig tau qhia nyob hauv daim duab 3.

Daim duab 3. Txais yuav cov txiaj ntsig ntawm ob lub roj teeb

Nws tuaj yeem pom los ntawm Daim Duab 3 tias qhov kub siab tshaj plaws ntawm acupuncture ntawm cov roj teeb ceramic-123.1 ℃. Tom qab ntsuas, lub roj teeb me ntsis o tsis muaj pa taws lossis tawg; lub siab tshaj plaws kub ntawm cov hluav taws xob tsis-ceramic-410 ℃. Thaum lub sijhawm kuaj, lub roj teeb tawg thiab haus luam yeeb, lub hau sab saum toj tau tawg, thiab qhov kev sim ua tsis tiav. Yog vim li cas rau qhov tshwm sim saum toj no tej zaum yuav cuam tshuam nrog cov xim pleev xim rau ntawm cov nplaim hluav taws xob tsis zoo. Txij li rab koob punching simulates luv luv hauv lub roj teeb, ntau cov cua sov yuav tsim nyob rau hauv lub sijhawm luv luv, thiab cov xim txheej ceramic ntawm qhov tsis zoo electrode nto tuaj yeem ncua kev kub thaum lub sijhawm rab koob punching txheej txheem. Ua kom nce siab, yog li ncua lub thermal hloov mus rau qhov hluav taws xob, thiab zam qhov tawg ntawm lub roj teeb vim muaj cov roj loj ntau hauv lub sijhawm luv. Yog li no, cov xim txheej ceramic ua kom zoo dua qub kev nyab xeeb ntawm cov roj ntsha lithium-ion.

2. Tej hub diaphragm

Tam sim no, cov kws tshawb nrhiav tsuas yog txhim kho kev ua haujlwm roj teeb nyob rau hauv cov nqe lus ntawm qhov zoo thiab tsis zoo, cais tawm, electrolytes, thiab roj teeb tsim. Ntawm lawv, cov lim cais ceramic yog txoj hauv kev zoo los txhim kho kev ua haujlwm ntawm roj teeb. Tej hub cais tsis tuaj yeem tsis tsuas txhim kho kev nyab xeeb ntawm roj teeb, tab sis kuj tseem txhim kho roj teeb kev ua haujlwm thiab txo tus nqi txo tus kheej. Muaj ntau txoj hauv kev tsim khoom rau cov khoom siv ua kom zoo nkauj ua kom zoo nkauj, xws li tshuaj vapor deposition thiab txheej txheej saum npoo. Ceramic diaphragm tuaj yeem txhim kho lub voj voog thiab kev nyab xeeb kev ua haujlwm ntawm cov roj teeb lithium ion, tab sis nws cov txheej txheem npaj tsis yooj yim los tswj, thiab cov ceramic ntawm daim diaphragm kuj tseem poob thaum lub voj voog.

1. Qhov txawv ntawm Morphological

Nquag siv cov diaphragms ntawm cov lag luam yog ua los ntawm PP, PE, lossis ob yam kev sib xyaw ua ke. Txawm hais tias cov microporous polyolefin separator no muaj cov tshuab zoo zog thiab tshuaj lom neeg ruaj khov, cov cais tawm no muaj kev ntxhov siab sab hauv thaum lub sijhawm npaj, thiab cov kev ntxhov siab tawm hauv qhov chaw sov, thiab cov cais tawm yuav muaj qhov pom tseeb thermal shrinkage effect, uas ua rau qhov zoo thiab tsis zoo electrodes sab hauv lub roj teeb Kev sib chwv ncaj qha ntawm cov khoom ua rau lub luv luv ntawm sab hauv thiab muaj kev nyab xeeb tsis ua haujlwm. Txheej nano alumina hais txog saum npoo ntawm lub tshuab hluav taws xob cais tuaj yeem txhim kho kev nyab xeeb ntawm cov roj teeb lithium. Tom qab yaj thiab cov hmoov sib xyaw ua ke nrog PVDF thiab NMP thiab dispersing uniformly, lub tshuab txheej tshuab tig mus rau lub tsho ua kom zoo li cov hmoov ceramic ntawm PE diaphragm. Lub tuab ntawm cov pa roj carbon txheej tuaj yeem tswj tau, thiab tom qab ntawd cov ntaub qhwv ceramic ua los ntawm kev ziab ntawm 80 ° C rau 24 teev. Lub micro morphology ntawm ceramic diaphragm yog muaj nyob hauv daim duab 4.

Daim duab 4. Micro morphology ntawm PE thiab ceramic diaphragm

Nws tuaj yeem pom los ntawm daim duab uas cov txheej txheem nano-A2O3 lo npog lub ntsej muag ntawm PE membrane, thiab muaj kev faib tawm tsis ncaj ntawm cov voids loj ntawm cov lus. Qhov muaj ntawm cov voids loj loj tuaj yeem pab txhawb kev nkag mus thiab rho tawm ntawm Li + thiab Nws muaj cov dej ua kom zoo thiab ua kom muaj kua kom zoo rau lub tshuab hluav taws xob, kom nws tsis txhob cuam tshuam lub txim thiab tawm ntawm cov roj teeb lithium tom qab txheej xim.

2. Qeb kawm ntawm tshav kub shrinkage

Cov xim pleev xim ua kom zoo dua txhawm rau txhim kho qhov kub kub tsis kam ntawm cov diaphragm. Tso cov diaphragm tso tawm thiab cov diaphragm zoo tib yam rau hauv ib lub thawv ntawm qhov sib txawv rau 2 teev. Muaj qhov sib txawv loj ntawm shrinkage ntawm ob hom diaphragms. Cov kev sim tshuaj sim tau qhia hauv daim duab 5.

Daim duab 5. Ob theem ntawm diaphragm shrinkage ntawm txawv txias

Lub diaphragm ntsws nyob rau ntawm qhov chaw siab vim tias daim ntaub diaphragm muaj kev ntxhov siab sab hauv vim traction thiab ncab thaum lub sijhawm npaj. Nyob rau hauv qhov chaw sov siab, qhov kev txav ntawm cov kav dej sab hauv lub cev ntawm cov diaphragm ua rau cov kev ntxhov siab tso tawm thiab ntsws hauv qhov chaw loj; tab sis cov ua kua ceramic diaphragm shrinks ntawm 140 Lub suab ntawm lub diaphragm nws tus kheej tsis tau hloov pauv tshwj tsis yog kev hloov pauv ntawm cov xim ntawm cov diaphragm hauv qab qhov ci ntawm ℃. Thaum cov txheej txheem ua haujlwm inorganic lo rau ob sab ntawm cov nplaim diaphragm muaj qhov kub tsis kam tiv thaiv thiab kub ua tau zoo, qhov kub ntawm lub hauv paus diaphragm nws tus kheej raug txo, kom lub diaphragm yog qhov kub. Daim tseem ntawv tseem nyob hauv ib puag ncig.

3. Cov roj hmab ua ke tau zoo dua los txhim kho kev nyab xeeb ntawm roj teeb

Daim duab 6. Qhov kev sib raug zoo ntawm sab hauv thiab qhov ntsuas kub ntawm lub roj teeb tau sib sau ua ke nrog ob hom diaphragms

PE separator ntsws nyob hauv qhov chaw loj thaum qhov kub siab dua qhov chaw nws yaj, yog li cov ncej zoo thiab tsis zoo sab hauv roj teeb ncaj qha rau thiab ua rau sab hauv luv luv. Yog li ntawd, sab hauv tsis zoo ntawm lub roj teeb ntsuas tau txo tsawg; txawm li cas los xij, rau cov coated separator txawm nyob ntawm 150 Lub hauv paus ntawm lub separator nws tus kheej yuav tsis hloov thaum ci ntawm ℃, yog li yuav tsis muaj luv Circuit Court hauv roj teeb, uas ua rau sab hauv tsis kam ntawm lub roj teeb tseem nce. PE separator yuav poob nws cov tshuab tsis ruaj khov rau qhov kub thiab txias ib puag ncig, uas yuav ua rau kev sib txuas ncaj qha ntawm cov hluav taws xob zoo thiab tsis zoo sab hauv lub roj teeb thiab ua rau luv Circuit Court. Cov kua hluavtaws ceramic cais muaj qhov kub thiab txias tiv thaiv kom zoo tiv thaiv luv luv hauv sab hauv lub roj teeb thiab txhim kho kev ruaj ntseg ntawm lub roj teeb.

4. Qhov cuam tshuam ntawm ceramic diaphragm ntawm lub roj teeb lub neej

Lithium-ion roj teeb separator tsis tsuas cais cov ncej zoo thiab tsis zoo sab hauv lub roj teeb, tab sis kuj yuav tsum muaj cov ion permeability zoo. Vim tias txheej hauv inorganic ntawm lub separator yuav ua rau kom tuab tuab ntawm cov khoom cais tawm, uas yuav cuam tshuam rau cov ion conductivity. Tab sis qhov kev sim ua pov thawj (Daim duab 7) nws cov cawv tsis muaj zog, tab sis daim diaphragm nrog cov xim txheej ceramic muaj cov kev ua tau zoo dua qub.

Daim duab 7. Piv ntawm lub voj voog ua tau zoo ntawm ob hom roj teeb diaphragm

PP / PE sib cais tsis-ncov qaum, muaj hydrophobic nto thiab muaj zog tsis zoo. Nws yog qhov nyuaj kom ntub thiab tswj polar organic electrolytes xws li ethylene carbonate thiab propylene carbonate, uas cuam tshuam ncaj qha rau lub voj voog kev ua haujlwm thiab siv roj teeb. Lub neej, thaum lub saum npoo ntawm inorganic ceramics yog hydrophilic vim tias muaj cov pab pawg hydroxyl, nws cov lus qhia tau zoo heev tuaj yeem ua kom ntub thiab rov qab muaj peev xwm ntawm lub diaphragm lossis electrode mus rau electrolyte, thiab zoo heev txhim kho lub voj voog kev ua haujlwm ntawm lub roj teeb. Nyob rau tib lub sijhawm, cov nano-alumina hais muaj qhov tshwj xeeb saum npoo thaj chaw, uas tuaj yeem txhim kho qhov ntub thiab cov kua ua kom zoo ntawm cov electrolyte mus rau cov ncej, thiab tseem yog qhov zoo rau lub neej ntawm lub roj teeb.

kom suav tau:

Cov ntsiab lus xaus, cov xim pleev xim ceramic muaj qhov cuam tshuam tseem ceeb rau kev ua tau zoo ntawm cov roj ntsha lithium-ion, tshwj xeeb tshaj yog kev nyab xeeb kev ua haujlwm ntawm cov roj teeb lithium. Kev ua kom tau cov nplaim hluav taws xob thiab cov nplaim hluav taws xob tsis zoo tuaj yeem txo qhov luv luv ntawm lub sijhawm sab hauv ntawm lub roj teeb thiab txhim kho kev nyab xeeb, tab sis kuj tseem txhim kho cov hluav taws xob electrolyte ntawm lub electrode thiab diaphragm, txo polarization, thiab txhim kho kev ua haujlwm tag nrho ntawm lub roj teeb. Yog li no, kev thov cov vuas voos vov yog qhov tsis sib xws hauv kev txhim kho lithium-ion roj teeb yav tom ntej.