Kev nyab xeeb thiab kev daws teeb meem ntawm lithium roj teeb
Nrog rau kev nrov ntawm cov xov tooj ntawm tes, cov khoom lag luam digital, thiab tsheb fais fab, cov roj teeb lithium-ion tau ua lub luag haujlwm tseem ceeb hauv tib neeg' lub neej. Siv cov teeb meem xws li tsis tshua muaj zog ceev thiab lub neej voj voog tsawg feem ntau raug thuam. Txawm li cas los xij, piv nrog cov teeb meem no, kev nyab xeeb ntawm cov roj teeb lithium yog qhov ua kom pom tseeb.
Nyob rau hauv xyoo tas los no, cov teeb meem tshwm sim los ntawm cov teeb meem kev nyab xeeb ntawm roj teeb muaj ntau, thiab qhov tshwm sim ntawm ntau yam teeb meem yog qhov txaus ntshai, xws li qhov teeb meem hluav taws kub ntawm lithium roj teeb ntawm Boeing 787 Dreamliner uas ua rau kev lag luam poob siab, thiab cov roj teeb loj loj thiab qhov xwm txheej tawg. ntawm Samsung Galaxy Note 7. Kev nyab xeeb ntawm cov roj teeb lithium-ion ib zaug ntxiv lub tswb.
Kev sib xyaw thiab kev ua haujlwm ntawm lub roj teeb lithium-ion
Cov roj teeb lithium-ion feem ntau yog tsim los ntawm qhov zoo electrode, tsis zoo electrode, electrolyte, separator, kev sib txuas sab nraud thiab ntim khoom. Ntawm lawv, qhov zoo electrode thiab qhov tsis zoo electrode muaj cov khoom siv hluav taws xob, cov khoom siv hluav taws xob, cov hlua khi, thiab lwm yam, uas yog sib npaug ntawm cov ntawv ci tooj liab thiab txhuas ntawv ci tam sim no.
Qhov zoo electrode muaj peev xwm ntawm lithium-ion roj teeb yog qhov siab, feem ntau lithium-intercalated hloov pauv hlau oxides, los yog polyanionic tebchaw, xws li lithium cobaltate, lithium manganate, ternary, lithium hlau phosphate, thiab lwm yam. lithium-ion roj teeb tsis zoo cov ntaub ntawv feem ntau yog cov ntaub ntawv carbon, xws li graphite thiab tsis-graphitized carbon; lithium ion roj teeb electrolyte yog cov tshuaj uas tsis yog-aqueous, muaj cov organic sib xyaw hnyav thiab lithium ntsev, cov kuab tshuaj feem ntau yog cov organic hnyav xws li carbonic acid, thiab lithium ntsev feem ntau monovalent polyanionic lithium ntsev, xws li Lithium hexafluorophosphate, thiab lwm yam. Lithium ion roj teeb cais feem ntau yog polyethylene thiab polypropylene microporous daim nyias nyias, uas cais cov khoom zoo thiab tsis zoo, tiv thaiv luv luv Circuit Court los ntawm kev hla ntawm electrons, thiab tso cai rau ions hauv electrolyte hla.
Thaum lub sij hawm them tus txheej txheem, nyob rau hauv lub roj teeb, lithium yog muab rho tawm los ntawm qhov zoo electrode nyob rau hauv daim ntawv ntawm ions, thauj los ntawm cov electrolyte los ntawm lub diaphragm, thiab embedded nyob rau hauv lub tsis zoo electrode; sab nraum lub roj teeb, electrons migrate los ntawm sab nraud Circuit Court mus rau qhov tsis zoo electrode. Nyob rau hauv cov txheej txheem tso tawm: lithium ions nyob rau hauv lub roj teeb yog muab rho tawm los ntawm qhov tsis zoo electrode, dhau los ntawm lub diaphragm, thiab yog embedded nyob rau hauv lub zoo electrode; sab nraum lub roj teeb, electrons migrate los ntawm sab nraud Circuit Court mus rau qhov zoo electrode. Nrog them thiab tso tawm, nws yog" lithium ion" uas migrate ntawm cov roj teeb es tsis txhob ntawm lub elemental" lithium", yog li ntawd lub roj teeb hu ua" lithium ion roj teeb".
Thib ob, kev nyab xeeb kev nyab xeeb ntawm lithium-ion roj teeb
Feem ntau hais lus, teeb meem kev nyab xeeb ntawm cov roj teeb lithium-ion tshwm sim lawv tus kheej li hlawv lossis tawg. Lub hauv paus ua rau cov teeb meem no yog thermal khiav hauv lub roj teeb. Tsis tas li ntawd, qee yam khoom siv sab nraud, xws li overcharge, hluav taws kub, nyem, puncture, thiab luv luv Circuit Court lwm yam teeb meem kuj tuaj yeem ua rau muaj teeb meem kev ruaj ntseg. Cov roj teeb lithium-ion yuav tsim kom muaj cua sov thaum them thiab tawm. Yog hais tias lub tshav kub generated tshaj lub roj teeb lub tshav kub dissipation muaj peev xwm, lub lithium-ion roj teeb yuav overheat, thiab cov khoom siv roj teeb yuav decompose lub SEI zaj duab xis, electrolyte decomposition, zoo electrode decomposition, tsis zoo electrode thiab kev puas tsuaj sab tshwm sim xws li cov tshuaj tiv thaiv ntawm cov electrolyte thiab cov tshuaj tiv thaiv ntawm qhov tsis zoo electrode thiab cov binder.
1 Kev nyab xeeb ntawm cov khoom siv cathode
Thaum lub roj teeb lithium-ion siv tsis raug, qhov kub thiab txias ntawm lub roj teeb yuav nce, thiab cov khoom siv ntawm cov khoom siv hluav taws xob zoo yuav raug decomposed thiab cov electrolyte yuav oxidized. Nyob rau tib lub sijhawm, ob qhov kev cuam tshuam no tuaj yeem tsim kom muaj cua sov ntau, ua rau lub roj teeb kub nce ntxiv. Lub xeev delithiation sib txawv muaj qhov sib txawv heev ntawm kev hloov pauv ntawm cov lattice ntawm cov khoom siv, qhov decomposition kub thiab thermal stability ntawm lub roj teeb.
2 Kev nyab xeeb ntawm cov khoom siv anode
Cov khoom siv tsis zoo electrode siv thaum ntxov yog xim hlau lithium, thiab cov roj teeb sib sau ua ke yog nquag tsim cov lithium dendrites tom qab rov them thiab tawm, uas yuav tho lub diaphragm, ua rau lub roj teeb luv luv, xau thiab txawm tawg. Lithium intercalation compounds tuaj yeem zam qhov tsim ntawm lithium dendrites thiab txhim kho kev nyab xeeb ntawm lithium-ion roj teeb. Raws li qhov kub nce, cov pa roj carbon tsis zoo nyob rau hauv lub xeev ntawm lithium intercalation ua ntej reacts exothermically nrog cov electrolyte. Nyob rau hauv tib qho kev them nqi thiab kev tso tawm, cov cua kub tso tawm ntawm cov tshuaj tiv thaiv ntawm cov electrolyte thiab lithium-intercalated dag graphite yog ntau dua li cov tshuaj tiv thaiv nrog lithium-intercalated mesophase carbon microspheres, carbon fibers, coke, thiab lwm yam.
3 Kev nyab xeeb ntawm diaphragm thiab electrolyte
Lub electrolyte ntawm lithium ion roj teeb yog ib qho kev tov ntawm lithium ntsev thiab organic hnyav. Kev lag luam lithium ntsev yog lithium hexafluorophosphate. Lub thermal stability ntawm electrolyte. Cov kuab tshuaj organic ntawm cov electrolyte yog carbonate, uas muaj qhov kub thiab txias taw tes, thiab yooj yim rau react nrog lithium ntsev kom tso PF5 ntawm qhov kub thiab txias, thiab yooj yim rau oxidized.
4 Kev nyab xeeb zais cia hauv cov txheej txheem tsim khoom
Thaum lub sij hawm tsim cov txheej txheem ntawm cov roj teeb lithium-ion, cov txheej txheem xws li kev tsim hluav taws xob thiab cov roj teeb sib dhos yuav muaj kev cuam tshuam rau kev nyab xeeb ntawm lub roj teeb. Kev tswj kom zoo ntawm ntau yam txheej txheem xws li qhov zoo thiab tsis zoo electrode sib xyaw, txheej, dov, txiav lossis xuas nrig ntaus, sib sau ua ke, sau cov electrolyte, sealing, thiab tsim txhua yam cuam tshuam rau kev ua haujlwm thiab kev nyab xeeb ntawm lub roj teeb. Lub uniformity ntawm slurry txiav txim siab uniformity ntawm active khoom tis ntawm lub electrode, yog li cuam tshuam rau kev ruaj ntseg ntawm lub roj teeb. Yog tias qhov zoo ntawm slurry loj dhau lawm, cov khoom siv hluav taws xob tsis zoo yuav raug hloov pauv loj heev thaum lub sij hawm them thiab tawm, thiab nag lossis daus ntawm cov hlau lithium tuaj yeem tshwm sim; Yog hais tias lub fineness ntawm slurry yog me me heev, lub internal kuj ntawm lub roj teeb yuav loj heev. Yog tias cov txheej txheej cua kub qis dhau los yog lub sijhawm ziab tsis txaus, cov kuab tshuaj yuav nyob twj ywm, thiab cov ntaub ntawv yuav raug yaj ib nrab, ua rau qee cov khoom siv tau yooj yim tev; Qhov kub thiab txias heev tuaj yeem ua rau cov ntaub ntawv yuav tsum carbonized, thiab cov ntaub ntawv nquag tuaj yeem poob thiab ua rau lub cev luv luv hauv lub roj teeb.
5 tej zaum yuav muaj kev phom sij thaum siv roj teeb
Cov roj teeb lithium-ion yuav tsum txo qis qis dua lossis tshaj tawm thaum siv. Tshwj xeeb tshaj yog rau cov roj teeb uas muaj peev xwm monomer, thermal cuam tshuam yuav ua rau muaj kev cuam tshuam sab nraud, ua rau muaj teeb meem kev nyab xeeb.
Peb lithium-ion roj teeb kev nyab xeeb ntsuas ntsuas
Tom qab cov roj teeb lithium-ion tau tsim, ua ntej nws mus txog cov neeg siv khoom, yuav tsum muaj kev sim ntau yam los xyuas kom meej tias muaj kev nyab xeeb ntawm lub roj teeb ntau li ntau tau thiab txo cov kev pheej hmoo ntawm kev nyab xeeb.
1. Squeeze test: Muab cov roj teeb uas them tag nrho rau ntawm qhov chaw tiaj tus, siv lub siab ntawm 13 ± 1KN los ntawm lub tog raj kheej hydraulic, thiab nyem lub roj teeb los ntawm lub tiaj tiaj ntawm lub pas nrig steel nrog txoj kab uas hla ntawm 32 hli. Thaum lub nyem nyem mus txog qhov siab tshaj plaws Squeeze, lub roj teeb tsis ntes hluav taws, tsuas yog tsis txhob' tsis tawg.
2. Kev ntsuam xyuas cuam tshuam: Tom qab lub roj teeb tau them tag nrho, muab tso rau ntawm qhov chaw tiaj tus, tso ib kab hlau nrog txoj kab uas hla ntawm 15.8mm vertically nyob rau hauv nruab nrab ntawm lub roj teeb, thiab poob 9.1kg qhov hnyav ntawm qhov siab ntawm 610mm mus rau steel kem saum lub roj teeb. Lub roj teeb tsis ntes hluav taws lossis tawg.
3. Overcharge test: Ua kom tag nrho lub roj teeb nrog 1C, thiab ua ib qho kev xeem overcharge raws li 3C overcharge 10V. Thaum lub roj teeb overcharged, qhov voltage nce mus rau ib qho voltage thiab stabilizes rau ib lub sij hawm. Thaum nws nyob ze rau ib lub sij hawm, lub roj teeb voltage nce sai heev. Thaum muaj qee qhov txwv, lub hau sab saum toj ntawm lub roj teeb raug rub tawm, qhov hluav taws xob poob rau 0V, thiab lub roj teeb tsis ntes hluav taws lossis tawg.
4. Kev ntsuas luv luv: Tom qab lub roj teeb tau them tag nrho, qhov zoo thiab qhov tsis zoo ntawm lub roj teeb ntawm lub roj teeb yog luv luv nrog cov xaim uas tsis muaj zog tshaj 50mΩ, thiab qhov ntsuas kub ntawm lub roj teeb raug kuaj. Qhov siab tshaj plaws kub ntawm lub roj teeb nto yog 140 ℃. Lub roj teeb lub hau qhib, thiab lub roj teeb tsis ntes hluav taws lossis tawg. .
5. Kev kuaj mob acupuncture: Muab cov roj teeb uas them tag nrho rau ntawm qhov chaw tiaj tus, thiab tho lub roj teeb rau hauv cov kev taw qhia radial nrog ib rab koob steel nrog txoj kab uas hla ntawm 3 hli. Lub roj teeb kuaj tsis ntes hluav taws lossis tawg.
6. Kev ntsuas kub ntawm lub voj voog: Lub voj voog ntsuas kub ntawm lithium ion roj teeb yog siv los simulate kev nyab xeeb ntawm lithium ion roj teeb thaum nws rov ua dua rau qhov kub thiab txias ib puag ncig thaum thauj lossis cia. Qhov kev sim yog siv ceev ceev thiab huab cua hloov pauv tau ua. Tom qab kev sim, tus qauv yuav tsum tsis txhob tua hluav taws, tawg, los yog xau.
Plaub lithium-ion roj teeb kev nyab xeeb daws teeb meem
Nyob rau hauv qhov kev pom ntawm ntau qhov kev nyab xeeb kev nyab xeeb ntawm cov roj teeb lithium-ion hauv cov khoom siv, kev tsim khoom thiab siv cov txheej txheem, yuav ua li cas los txhim kho cov khoom uas muaj kev nyab xeeb yog ib qho teeb meem uas cov tuam txhab roj teeb lithium-ion yuav tsum tau daws.
1 Txhim kho kev nyab xeeb ntawm electrolyte
Muaj kev ua haujlwm siab ntawm cov electrolyte thiab qhov zoo thiab tsis zoo electrodes, tshwj xeeb tshaj yog thaum kub kub. Txhawm rau txhim kho kev nyab xeeb ntawm lub roj teeb, kev txhim kho kev nyab xeeb ntawm electrolyte yog ib txoj hauv kev zoo dua. Lub peev xwm muaj kev nyab xeeb ntawm electrolyte tuaj yeem daws tau zoo los ntawm kev ntxiv cov khoom siv ntxiv, siv cov ntsev lithium tshiab thiab siv cov kuab tshuaj tshiab.
Raws li cov haujlwm sib txawv ntawm cov khoom siv ntxiv, lawv tuaj yeem muab faib ua pawg hauv qab no: kev tiv thaiv kev nyab xeeb additives, film-forming additives, zoo electrode tiv thaiv additives, stabilizing lithium ntsev additives, lithium nag lossis daus txhawb additives, tam sim no collector anticorrosive additives, thiab wettability enhancing additives. .
Txhawm rau txhim kho kev ua haujlwm ntawm kev lag luam lithium ntsev, cov kws tshawb fawb tau hloov cov atoms rau lawv thiab tau txais ntau yam khoom siv. Ntawm lawv, cov tebchaw tau txais los ntawm kev hloov cov atoms nrog perfluoroalkyl pawg muaj ntau yam zoo xws li lub teeb nyem siab, zoo sib xws, thiab txhim kho dej tsis kam. , yog ib hom lithium ntsev compound nrog rau daim ntawv thov kev cia siab. Tsis tas li ntawd, anionic lithium ntsev tau txais los ntawm chelate lub boron atom nrog oxygen ligand muaj thermal stability.
Hais txog cov kuab tshuaj, ntau tus kws tshawb fawb tau tawm tswv yim txog cov kuab tshuaj organic tshiab, xws li carboxylic acid esters thiab organic ethers. Tsis tas li ntawd, cov kua ionic kuj muaj cov chav kawm ntawm electrolytes nrog kev nyab xeeb siab, tab sis feem ntau siv cov carbonate-raws li electrolytes. Lub viscosity ntawm ionic kua yog txiav txim siab ntau dua, thiab cov conductivity thiab ion tus kheej diffusion coefficient yog tsawg. Tseem muaj ntau txoj haujlwm ua ntej kev ua haujlwm. Ua.
2 Txhim kho kev nyab xeeb ntawm cov khoom siv electrode
Lithium hlau phosphate thiab ternary composite cov ntaub ntawv raug suav hais tias yog tus nqi qis," kev nyab xeeb zoo heev" cov ntaub ntawv cathode, thiab tej zaum yuav nrov hauv kev lag luam tsheb hluav taws xob. Rau cov khoom siv electrode zoo, txoj hauv kev los txhim kho nws txoj kev nyab xeeb yog txheej hloov kho. Piv txwv li, txheej txheej ntawm cov khoom siv electrode zoo nrog cov hlau oxide tuaj yeem tiv thaiv kev sib cuag ncaj qha ntawm cov khoom siv hluav taws xob zoo thiab cov khoom siv electrolyte, inhibit theem hloov ntawm cov khoom siv electrode zoo, thiab txhim kho nws cov qauv kev ruaj ntseg txo qhov teeb meem ntawm cations hauv. siv lead ua lattice kom txo cov cua sov tsim los ntawm sab kev cuam tshuam.
Rau cov khoom siv hluav taws xob tsis zoo, vim tias feem ntau yog qhov feem ntau ua rau thermochemical decomposition thiab tsim hluav taws xob hauv lithium ion roj teeb, kev txhim kho thermal stability ntawm SEI zaj duab xis yog ib txoj hauv kev los txhim kho kev nyab xeeb ntawm cov khoom tsis zoo electrode. Los ntawm tsis muaj zog oxidation, hlau thiab hlau oxide deposition, polymer lossis carbon txheej, thermal stability ntawm cov khoom tsis zoo electrode tuaj yeem txhim kho.
3 Txhim kho lub roj teeb kev ruaj ntseg tsim qauv
Ntxiv rau kev txhim kho kev nyab xeeb ntawm cov khoom siv roj teeb, cov roj teeb lithium-ion kev lag luam tau txais ntau yam kev tiv thaiv kev nyab xeeb, xws li teeb tsa roj teeb kev nyab xeeb li qub, thermal fuses, txuas cov khoom sib txuas nrog qhov zoo kub coefficients hauv series, siv thermally kaw diaphragms, loading siab tiv thaiv circuits, thiab mob siab rau kev tswj hwm roj teeb, thiab lwm yam, kuj yog ib txoj hauv kev los txhim kho kev ruaj ntseg.
Tsib lithium-ion roj teeb kev nyab xeeb kev daws teeb meem
Raws li kev nyab xeeb ntawm lithium-ion roj teeb tau nyiam ntau dua thiab ntau dua, ntau lub tuam txhab tau tshawb fawb thiab txhim kho tshwj xeeb rau kev nyab xeeb kev nyab xeeb hauv cov roj teeb lithium-ion, thiab muab cov kev daws teeb meem zoo rau roj teeb.
Raws li cov kws tshawb fawb ntxov tshaj plaws ntawm lub zog hluav taws xob hauv tsev hluav taws xob thermal runaway ceeb toom thiab kev nyab xeeb thev naus laus zis thiab cov pioneer ntawm roj teeb lub thawv tshwj xeeb tsis siv neeg tua hluav taws tua hluav taws, Chuangwei Tshiab Zog pioneered" lithium-ion roj teeb thermal runaway qauv", uas txhawb nqa roj teeb lub thawv thermal runaway xyuas thiab tsis siv neeg tua hluav taws. Kev siv tshuab loj heev.
Lub" Lithium-ion roj teeb thermal runaway qauv" muab faib ua peb qhov ntev: ntsug, kab rov tav thiab ntsug. Cov kev taw qhia ntsug yog cov ntaub ntawv redundancy ntawm ntau lub sensors, uas yog, ntau pawg ntawm cov ntaub ntawv sensor nyob rau hauv tib ib puag ncig yog haum rau simulate cov ntaub ntawv characterization nkhaus ntawm cov ntaub ntawv sib txawv thiab txawv ib puag ncig; kab rov tav kev taw qhia yog lub sij hawm tas mus li algorithm rau cov ntaub ntawv keeb kwm ntawm lub sensor kom tshem tawm cov suab nrov cuam tshuam zoo daws cov teeb meem ntawm lub tswb tsis tseeb, ceeb toom tsis tseeb, thiab ceeb toom ntxov lag hauv txoj kev pib; ntsug puncture, blunt koob backlog thiab lwm txoj kev yog siv los simulate lub thermal runaway txheej txheem ntawm ntau hom roj teeb fais fab.
Los ntawm peb-dimensional fusion, txoj kev ua lej, raws li ntau qhov kev sim thiab cov ntaub ntawv ua haujlwm tiag tiag, kev sib raug zoo sab hauv ntawm ntau yam sib txawv los ntawm thermal runaway tau sau tseg, thiab cov hauv paus ntsiab lus paj hlwb yog siv los ua ib qho tseem ceeb heev, txhim khu kev qha, thiab tus kheej. -operating" lithium ion" Roj teeb thermal runaway qauv" paub txog kev ceeb toom ntxov thiab kev txawj ntse tswj cov kev phom sij zais hauv lub roj teeb lub neej.
Ntau tus qauv ceeb toom ntxov tau tshwm sim hauv kev ua haujlwm ntawm lub tsheb tiag tiag tau ua pov thawj qhov ua tau zoo thiab kev nce qib ntawm cov qauv no, ua rau nws cov thev naus laus zis ntawm lub thawv roj teeb tam sim no thermal runaway ceeb toom thiab tsis siv neeg tua hluav taws.
Shenzhen Benwei roj teeb yog lub tuam txhab high-tech tshwj xeeb hauv R& D, ntau lawm thiab muag ntawm lithium-ion roj teeb. Nws cov khoom siv daim ntawv thov thaj chaw npog: hluav taws xob tsheb lithium roj teeb, lithium fais fab roj teeb, lub zog cia lithium roj teeb, thiab lwm yam. Lub tuam txhab thiab roj teeb cell manufacturers tuav lub sij hawm ntev kev sib raug zoo kev sib raug zoo, thiab siv qhov tseeb technological achievements thiab cov ntsiab lus rau tag nrho cov series ntawm cov khoom. cov txheej txheem kev loj hlob. Lub chaw tsim khoom yog nruab nrog cov cuab yeej tsim khoom siab heev thiab cov cuab yeej ntsuas thawj zaug. Nyob rau tib lub sijhawm, nws muaj ib pab pawg ntawm kev tsim khoom thiab kev tswj xyuas zoo, nruj me ntsis txhua kauj ruam ntawm cov khoom txuas, thiab dhau los ntawm kev ua kom zoo dua qub thiab txhim kho hauv cov txheej txheem kom ntseeg tau tias roj teeb muaj kev nyab xeeb.
