Cov nyhuv ntawm roj teeb Raw Materials ntawm Stability ntawm Cathode Electrode Slurry
Lub roj teeb slurry yog ib qho kua nplaum-kua ob-theem ncua kev kaw lus, thiab txhawm rau ntsuas qhov ruaj khov ntawm cov kab ke no, thawj kauj ruam yog los kawm txog nws cov muaj pes tsawg leeg thiab nws cov khoom ua haujlwm. Feem ntau ntawm kev lag luam lithium siv cov roj-raws li slurry, uas yog ib qho kev sib xyaw ua ke los ntawm kev sib xyaw thiab dispersing active cov ntaub ntawv, binders, conductive agents, solvents, thiab lwm yam nyob rau hauv ib tug tej yam ratio thiab kev txiav txim.
Cathode Active Khoom
Raws li lub ntsiab electrochemical active tivthaiv nyob rau hauv lub cathode slurry, cov khoom cathodeactive txiav txim siab qhov voltage, zog ceev thiab lwm yam yooj yim zog ntawm lub roj teeb thiab yog lub hauv paus ntawm lub slurry system. Qhov loj me me faib, thaj chaw tshwj xeeb, pH lossis seem alkali tus nqi thiab lwm yam khoom ntawm cov khoom siv cuam tshuam rau kev ruaj ntseg ntawm slurry.
Particle loj faib:
Qhov loj me me thiab particle loj faib ntawm cov khoom siv yog ib qho tseem ceeb hauv cov txheej txheem slurry. Qhov me me ntawm cov khoom siv, qhov ntau dua qhov viscosity ntawm lub sijhawm tas mus li, qhov tsis muaj zog ntawm slurry stratification tshwm sim tshwm sim los ntawm lub ntiajteb txawj nqus, thiab qhov zoo dua qhov kev ruaj ntseg ntawm kev ncua. Txawm li cas los xij, thaum qhov loj me me raug txo rau qee qhov me me, lub zog sib txuas ntawm cov khoom ua lub luag haujlwm tseem ceeb, thiab agglomeration yuav tshwm sim ntawm cov khoom, uas tsis tsim nyog rau kev ruaj ntseg ntawm lub cev. Yog li ntawd, nyob rau hauv dispersion ntawm slurry, lub particle loj tsis yog qhov zoo dua, tab sis nws yuav tsum tau muab faib nyob rau hauv ib tug nqaim luaj li cas ntau yam kom ua tau raws li qhov sib npaug ntawm suction thiab repulsion, thiaj li ua kom lub stability ntawm lub slurry system.
Qhov tshwj xeeb ntawm thaj chaw:
Nws yog ib qho tseem ceeb uas cuam tshuam rau kev ua haujlwm ntawm tes. Qhov loj dua qhov tshwj xeeb ntawm thaj chaw zoo dua qhov kev ua tau zoo ntawm cov hluav taws xob hluav taws xob ntawm lub xov tooj ntawm tes, uas yog ncaj qha cuam tshuam rau hauv qis sab hauv ntawm tes, kev ua haujlwm yooj yim ntawm lub peev xwm, thiab kev ua haujlwm zoo dua thiab kev ua haujlwm ntau dua. Txawm li cas los xij, qhov tshwj xeeb ntawm thaj chaw loj dhau ua rau cov qauv adhesion hauv slurry txhim kho, uas tsis tsim nyog rau kev sib cuam tshuam ntawm cov particle dispersion.
pH los yog residual alkali tus nqi:
Tus nqi pH nws tus kheej tsis cuam tshuam rau kev ruaj ntseg ntawm cov slurry, tab sis alkaline ib puag ncig muaj kev cuam tshuam ntau dua rau cov ntawv khi thiab tuaj yeem ua rau muaj kev hloov pauv hauv cov qauv ntawm cov binder nws tus kheej. Tshwj xeeb tshaj yog rau cov ntaub ntawv cathode ternary vim tias cov lithium ntsev ntau dhau hauv nws cov txheej txheem synthesis, cov lithium ntsev ntau dhau ua rau lithium (Li) oxide tom qab kub kub calcination, uas reacts nrog dej (H2O) thiab carbon dioxide (CO2) nyob rau hauv cov huab cua los tsim lithium hydroxide (LiOH) thiab lithium carbonate (Li2CO3) cov khoom yuav nyob rau saum npoo ntawm cov khoom siv dua.
Binder
Lub luag haujlwm tseem ceeb ntawm cov ntawv khi hauv slurry yog txhawm rau txuas cov khoom siv hluav taws xob, cov khoom siv hluav taws xob thiab cov khoom siv, txhawm rau txhim kho kev sib cuag hluav taws xob ntawm cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob thiab cov khoom siv, thiab muab lub luag haujlwm ruaj khov rau cov slurry system. Niaj hnub no, polyvinylidene fluoride (PVDF) feem ntau yog siv los ua binder hauv kev lag luam lithium vim PVDF muaj kev ua haujlwm zoo, thermal stability (ntev ntev siv kub -40 ~ 150 degree), thiab adaptability thiab stability rau electrolyte. Lub binder yog qhwv ib ncig ntawm cov khoom siv los ntawm cov neeg kho tshuab nplawm tom qab dissolving hauv nitrogen methylpyrrolidone (NMP), thiab bonded los ntawm hydrogen bonding force thiab van der Waals quab yuam, thiab lwm yam.
Conductive agent
Lub luag haujlwm tseem ceeb ntawm tus neeg sawv cev hauv cathode slurry yog los txo cov kev tiv thaiv sab hauv ntawm lub roj teeb thiab txhim kho lub peev xwm volatilization, feem ntau xaiv cov hmoov carbon conductive nrog CNT slurry ua tus neeg sawv cev tseem ceeb. Vim nws qhov me me me me (yooj yim rau daim 1-5mm pawg) thiab thaj chaw loj tshwj xeeb (kwv yees 60m2 / g), nws nyuaj rau disperse uniformly hauv slurry, yog li qhov yuav tsum tau ua rau cov txheej txheem sib tov yog siab heev.
Dispersants
Lub luag hauj lwm tseem ceeb ntawm dispersant nyob rau hauv cathode slurry yog kom yaj lub binder thiab muab ib tug zoo cab kuj rau cov active khoom yuav dispersed ntau uniformly. Nyob rau hauv lub txheej txheej, cov dispersant yuav tsum muaj zoo wettability thiab fluidity rau cov hlau substrate thiab zoo volatility thaum ziab. Piv nrog rau lwm yam dispersants xws li H2O, NMP, DMAC (dimethyl acetamide), DMF (dimethyl formamide), thiab lwm yam, NMP muaj qhov zoo ntawm solubility siab, tsis muaj viscosity, tsis tshua muaj volatility, zoo stability thiab yooj yim rov qab, yog li kev lag luam feem ntau siv lub NMP-PVDF system. Ntawm qhov tsis sib xws, yog NMP tso nyiaj tsawg dua, cov viscosity ntawm slurry loj, cov hmoov tsis zoo dispersed thiab lub liquidity ntawm slurry yog tsawg. Yog li ntawd, tsis muaj kev tswj hwm nruj rau cov nyiaj ntawm NMP ntxiv, qhov tseem ceeb tshaj plaws yog kom ntseeg tau tias nws tuaj yeem sib npaug.
Moisture
Moisture tshwm sim raws li impurity nyob rau hauv oily slurry, feem ntau yog coj los ntawm raw khoom nyob rau hauv slurry los yog thaum sib tov. Qhov nce ntawm nws cov ntsiab lus yuav cuam tshuam rau lub viscosity ntawm slurry, rhuav tshem cov uniformity ntawm cov kuab tshuaj, ua rau lub agglomeration ntawm cathode hais mus rau hauv pawg, thiab phenomenon ntawm tev thiab ntog tawm thaum lub ncej yog muab tso rau tom qab ziab, yog li cov kev taw qhia ntawm noo noo yuav tsum tau tswj ob qho tib si nyob rau hauv raw khoom thiab nyob rau hauv kev sib tov.
TOB NEW ENRTGYmuab tag nrho cov khoom siv roj teeb
