Yuav ua li cas los daws cov teeb meem txheej uniformity ntawm lithium hlau phosphate roj teeb?
Cov txheej txheem tsis sib xws ntawm lithium hlau phosphate roj teeb tsis tsuas yog ua rau lub roj teeb tsis zoo, tab sis kuj muaj kev txhawj xeeb txog cov teeb meem xws li kev tsim thiab siv kev nyab xeeb.
Yog li ntawd, kev tswj ntawm txheej uniformity yog nruj heev nyob rau hauv cov txheej txheem ntawm lithium hlau phosphate roj teeb. Cov neeg uas paub txog cov qauv thiab txheej txheej txheej txheem paub tias qhov me me ntawm cov khoom siv, qhov nyuaj dua yog ua cov txheej txheem txheej. Raws li deb ntawm nws cov txheej txheem muaj kev txhawj xeeb, kuv tseem tsis tau pom cov lus piav qhia tseem ceeb. Cov kab txheej txheej ntseeg tau tshwm sim los ntawm qhov tsis yog -Newtonian kua zog ntawm cov electrode muab tshuaj.
Cov electrode slurry yuav tsum yog cov kua dej thixotropic nyob rau hauv ib qho uas tsis yog -Newtonian kua, uas yog tus yam ntxwv los ntawm viscous los yog txawm lub xeev ntawm so, tab sis yuav nyias thiab yooj yim ntws tom qab agitation. Binders yog linear lossis network qauv hauv lub xeev submicroscopic. Thaum agitated, cov qauv no puas lawm thiab cov fluidity yog zoo. Tom qab so, lawv rov ua dua - thiab cov dej ntws tsis zoo. Lithium hlau phosphate hais me me. Nyob rau hauv tib lub loj, tus naj npawb ntawm cov particles nce. Txhawm rau txuas lawv los tsim ib qho kev sib txuas lus zoo, tus nqi ntawm tus neeg sawv cev yuav tsum tau nce ntxiv. Raws li cov khoom me me thiab tus nqi ntawm cov khoom siv hluav taws xob nce, cov ntaub ntawv xav tau kuj nce ntxiv. Thaum sawv ntsug, nws yooj yim dua los tsim cov qauv hauv network, thiab qhov fluidity yog qhov phem dua li cov khoom siv.
Nyob rau hauv tus txheej txheem ntawm tshem cov slurry los ntawm lub agitator mus rau txheej txheej, ntau manufacturers tseem siv lub turnover thoob los hloov cov slurry. Thaum lub sij hawm tus txheej txheem, lub slurry tsis yog stirred los yog stirring siv tsawg, thiab fluidity ntawm slurry hloov thiab maj mam ua viscous. Zoo li jelly. Lub fluidity tsis zoo, ua rau cov unating uniformity kev sib xws, uas yog manifested raws li kev nce hauv lub npe thooj forphology.
Lub hauv paus tseem ceeb yog los txhim kho cov khoom siv, xws li nce cov hluav taws xob conductivity, nce cov khoom, spheroidizing cov khoom, thiab lwm yam, thiab cov nyhuv yuav raug txwv rau lub sijhawm luv luv. Raws li cov ntaub ntawv uas twb muaj lawm, los ntawm kev pom ntawm kev ua cov roj teeb, cov kev txhim kho tuaj yeem sim los ntawm cov hauv qab no:
1. Using "linear" conductive agent
The so-called "linear" and "particle-shaped" conductive agents are the author's image, and may not be described in this way academically.
"Linear" conductive agents are used, mainly VGCF (carbon fiber) and CNTs (carbon nanotube), metal nanowires, etc. at present. They have a diameter of several nanometers to tens of nanometers, and a length of more than tens of micrometers or even a few centimeters, while the size of the currently commonly used "particle-shaped" conductive agents (such as SuperP, KS-6) is generally tens of nanometers. The size is a few microns. In the pole piece composed of "particle-shaped" conductive agent and active material, the contact is similar to the point-to-point contact, and each point can only contact the surrounding points; in the pole piece composed of "linear" conductive agent and active material, It is the point-to-line, line-to-line contact, each point can be in contact with multiple lines at the same time, and each line can also be in contact with multiple lines at the same time. Even better. Using a combination of different types of conductive agents can play a better conductive effect. How to choose the conductive agent is a problem worth exploring for battery production.
Possible effects of using "linear" conductive agents such as CNTS or VGCF are:
(1) Cov kab hluav taws xob cov kab hluav taws xob txhim kho cov txiaj ntsig kev sib raug zoo rau qee qhov thiab txhim kho qhov yooj yim thiab lub zog ntawm tus ncej;
(2) Txo tus nqi ntawm cov khoom siv hluav taws xob (nco ntsoov tias nws tau tshaj tawm tias cov khoom siv hluav taws xob ntawm CNTS yog 3 npaug ntawm cov khoom siv hluav taws xob zoo ib yam ntawm cov khoom hnyav (qhov hnyav)), ua ke nrog (1), cov nqi ntawm kua nplaum kuj yuav raug txo kom tsawg, thiab cov ntsiab lus ntawm cov tshuaj nquag tuaj yeem nce ntxiv;
(3) Txhim kho polarization, txo kev tiv thaiv kev tiv thaiv, thiab txhim kho lub voj voog kev ua haujlwm;
(4) Lub network conductive muaj ntau qhov sib tiv tauj, lub network zoo dua qub, thiab tus nqi ua tau zoo dua li cov khoom siv hluav taws xob zoo; cov cua kub dissipation kev ua tau zoo dua qub, uas yog qhov tseem ceeb heev rau cov roj teeb uas muaj nqi siab;
(5) Kev ua haujlwm nqus tau zoo dua;
(6) Cov khoom siv tus nqi siab dua thiab cov nqi nce. Rau 1Kg conductive tus neeg saib xyuas, feem ntau siv SUPERP tsuas yog kaum tawm yuan, VGCF yog kwv yees li ob lossis peb txhiab yuan, thiab CNTS yog me ntsis siab dua VGCF (thaum qhov ntxiv yog 1 feem pua, 1KgCNTs yog xam ntawm 40 00 yuan, nce ntawm 0.3 yuan ib Ah);
(7) Qhov tshwj xeeb nto ntawm CNTS, VGCF, thiab lwm yam yog siab. Yuav ua li cas disperse yog ib qho teeb meem uas yuav tsum tau daws nyob rau hauv kev siv. Txwv tsis pub, kev ua haujlwm ntawm dispersing tsis zoo. Ultrasonic dispersion thiab lwm yam txhais tau tias yuav siv tau. Muaj CNTs tuam txhab uas muag muab cov kua dispersed conductive.
2. Txhim kho cov nyhuv dispersion
Yog hais tias cov nyhuv dispersion zoo, qhov tshwm sim ntawm particle contact agglomeration yuav txo tau zoo heev, thiab stability ntawm slurry yuav zoo heev. Cov nyhuv dispersion tuaj yeem txhim kho rau qee yam los ntawm kev txhim kho cov qauv thiab cov kauj ruam batching, thiab ultrasonic dispersion tau hais los saum no kuj yog ib txoj hauv kev zoo.
3. Txhim kho cov txheej txheem hloov slurry
Thaum khaws cia cov slurry, xav txog qhov ua kom nrawm kom tsis txhob muaj cov slurry ua nplaum; rau cov neeg siv lub thoob hloov pauv hloov cov slurry, txo lub sij hawm los ntawm kev tawm mus rau txheej ntau li ntau tau, thiab hloov mus rau kev thauj mus los hauv cov kav dej yog tias ua tau los txhim kho cov slurry viscosity.
4. Siv extrusion txheej (txhaj tshuaj)
Extrusion txheej tuaj yeem txhim kho qhov kev ntxhib los mos thiab tsis sib xws ntawm cov hniav txheej, tab sis cov khoom siv kim thiab yuav tsum muaj kev ruaj ntseg dua ntawm slurry.
