Lub caij ntuj no lithium-ion roj teeb muaj peev xwm yuav dhau los ua qhov tsis zoo, vim li cas lub roj teeb lithium ion "ntshai" tsis kub?

Tác giả ：Iflowpower – Добављач преносних електрана

Txij li thaum nkag mus rau hauv kev ua lag luam, cov roj teeb lithium-ion tau txais ntau yam kev siv nrog nws qhov zoo ntawm lub neej ntev, muaj peev xwm loj, tsis muaj kev nco. Tsawg kub ntawm lithium-ion roj teeb yog tsawg, hnyav attenuation, tsis zoo voj voog magnification kev ua tau zoo, pom tseeb lithium phenomenon, deinterlaxing lithium imbalance, thiab lwm yam. Txawm li cas los xij, nrog kev nthuav dav ntxiv ntawm daim ntawv thov, kev txwv tsis pub ua haujlwm ntawm cov roj teeb lithium-ion yog qhov pom tseeb dua.

Raws li cov lus ceeb toom, lub peev xwm tso tawm ntawm lithium-ion roj teeb tsuas yog kwv yees li 31.5% ntawm chav tsev kub ntawm -20 ° C. Ib txwm lithium-ion roj teeb ua haujlwm kub ntawm -20 - + 55 ° C.

Tab sis nyob rau hauv lub teb ntawm aerospace, hluav taws xob tsheb, thiab lwm yam, lub roj teeb yuav ua hauj lwm kom zoo ntawm -40 ° C. Yog li ntawd, nws yog ib qho tseem ceeb heev los txhim kho qhov kub thiab txias ntawm lithium ion roj teeb.

Cov yam tseem ceeb txwv cov lithium-ion roj teeb uas tsis muaj qhov kub thiab txias ua haujlwm ● Nyob rau hauv qhov kub thiab txias ib puag ncig, lub viscosity ntawm cov electrolyte nce, txawm tias ib nrab solidified, uas ua rau cov hluav taws xob conductivity tsawg ntawm lithium ion roj teeb. ● Cov kev sib raug zoo ntawm cov electrolyte thiab cov electrode tsis zoo thiab cov diaphragm yog deteriorated nyob rau hauv qhov kub thiab txias ib puag ncig. ● Qhov tsis zoo electrode ntawm lithium-ion roj teeb nyob rau hauv qhov kub thiab txias ib puag ncig yog hnyav heev, thiab cov hlau precipitated lithium yog reacted nrog cov electrolyte, thiab cov khoom deposition ua rau ib tug solid state electrolyte interface (SEI) thickness nce.

● Lithium ion roj teeb nyob rau hauv qhov kub thiab txias ib puag ncig yog qis dua, thiab tus nqi hloov pauv impedance (RCT) tau nce ntxiv. Kev sib tham txog qhov ntsuas kub tsis tshua muaj kev cuam tshuam rau cov roj teeb lithium ion ● Cov kws tshaj lij pom 1: Cov tshuaj electrolyne muaj qhov cuam tshuam tseem ceeb rau kev ua haujlwm kub ntawm lithium ion roj teeb, cov khoom muaj pes tsawg leeg thiab cov khoom siv hluav taws xob muaj feem cuam tshuam rau lub roj teeb uas tsis muaj qhov kub thiab txias. Qhov teeb meem nyob rau hauv lub roj teeb uas tsis muaj kub yog: lub viscosity ntawm cov electrolyte yuav loj, lub ion conduction ceev yog qeeb, ua rau lub electron tsiv teb tsaws ceev ntawm lub sab nraud Circuit Court, yog li ntawd lub roj teeb yog heev polarized, thiab tus nqi thiab paug muaj peev xwm txo qis.

Tshwj xeeb tshaj yog thaum them nyiaj qis, lithium ions tuaj yeem yooj yim tsim lithium delegranes ntawm qhov chaw ntawm qhov tsis zoo electrode, ua rau lub roj teeb tsis ua haujlwm. Qhov kub tsis tshua muaj kev ua tau zoo ntawm cov electrolyte yog ze ze rau qhov loj ntawm cov electrolyte tus kheej conductivity, kev sib kis ion ntawm cov hluav taws xob conductivity yog ceev, thiab muaj peev xwm ntau dua ntawm qhov kub thiab txias. Qhov ntau cov lithium ntsev nyob rau hauv cov electrolyte, qhov ntau ntawm cov migrations, cov conductivity ntau dua.

Cov hluav taws xob hluav taws xob siab, qhov ceev ntawm ion conductivity, qhov me me ntawm polarization, qhov ua tau zoo ntawm lub roj teeb ntawm qhov kub thiab txias. Yog li ntawd, kev siv hluav taws xob ntau dua yog qhov tsim nyog rau kev ua tiav qhov ua tau zoo ntawm qhov kub thiab txias ntawm lithium ion roj teeb. Cov hluav taws xob conductivity ntawm cov electrolyte muaj feem xyuam rau cov muaj pes tsawg leeg ntawm cov electrolyte, thiab viscosity ntawm cov kuab tshuaj yog los txhim kho txoj kev ntawm electrolyte hluav taws xob conductivity.

Lub fluidity ntawm cov kuab tshuaj yog qhov zoo ntawm qhov kub thiab txias ntawm cov kuab tshuaj yog qhov lav ntawm ion thauj, thiab cov khoom electrolyte membrane tsim los ntawm cov electrolyte nyob rau hauv qhov kub thiab txias electrolyte kuj yog ib qho tseem ceeb rau cov lithium ion conduction, thiab RSEI yog lub ntsiab impedance ntawm lithium ion roj teeb nyob rau hauv ib tug tsawg kub ib puag ncig. ● Cov kws tshaj lij pom zoo 2: Kev txwv lithium-ion roj teeb uas tsis muaj qhov kub thiab txias ua haujlwm yog qhov nce siab hauv LI + diffusion impedance nyob rau hauv qis kub, tab sis tsis yog SEI zaj duab xis. Tsawg kub yam ntxwv ntawm cov khoom zoo electrode ntawm lithium ion roj teeb ● 1, qhov kub tsis tshua muaj cov yam ntxwv txheej txheej txheej txheej txheej txheej txheej zoo electrode cov khoom muaj ob qho tib si ib-dimensional lithium ion diffusion channel, thiab muaj cov qauv kev ruaj ntseg ntawm peb-dimensional channel, uas yog cov khoom lag luam ntxov tshaj plaws.

Lithium ion roj teeb khoom zoo. Nws cov khoom sawv cev suav nrog LiCoO2, Li (CO1-XNIX) O2 thiab Li (Ni, Co, Mn) O2, thiab lwm yam. Xie Xiaohua, thiab lwm yam.

siv LiCoo2 / MCMB ua cov khoom tshawb fawb, sim nws cov yam ntxwv ntawm qhov kub thiab txias. Cov txiaj ntsig tau pom tias thaum qhov kub thiab txias qis, qhov tso tawm platform poob los ntawm 3.762V (0 ° C) mus rau 3.

207V (-30 ° C); nws lub roj teeb tag nrho muaj peev xwm kuj raug txo los ntawm 78.98mA · h (0 ° C) mus rau 68.55mA · h (-30 ° C).

● 2, cov yam ntxwv ntawm qhov kub thiab txias tsis zoo ntawm cov khoom siv zoo ntawm spinel qauv spinel qauv LiMn2O4 cov khoom zoo, vim tias tsis muaj Co element, muaj tus nqi qis, tsis muaj tshuaj lom zoo. Txawm li cas los xij, Mn valence iav thiab JaHN-Teller nyhuv ntawm Mn3 +, ua rau muaj teeb meem xws li cov qauv tsis ruaj khov thiab rov qab sib txawv. Peng Zhengshun, qhia tias kev ua haujlwm ntawm electrochemical ntawm LiMn2O4 cov ntaub ntawv zoo electrode yog qhov loj, thiab RCT yog siv los ua piv txwv: RCT ntawm LIMN2O4 synthesized los ntawm cov khoom kub kub yog qhov siab dua li sol gel txoj kev, thiab qhov tshwm sim no yog nyob rau hauv lithium ion Implanted ntawm diffusion coefficients.

Qhov laj thawj feem ntau yog vim cov txheej txheem hluavtaws sib txawv rau cov crystallinity thiab morphology ntawm cov khoom. ● 3, cov yam ntxwv tsis tshua muaj kub ntawm cov phosphate system zoo electrode cov khoom LIFEPO4 yog lub cev tseem ceeb ntawm lub zog hluav taws xob tam sim no cov khoom siv zoo vim qhov ntim zoo heev thiab kev nyab xeeb, nrog cov khoom siv ternary. Qhov kub tsis kam ntawm cov hlau phosphate feem ntau yog vim cov khoom siv nws tus kheej yog cov rwb thaiv tsev, cov hluav taws xob hluav taws xob tsawg, cov lithium ion diffusion tsis zoo, yog li ntawd cov roj teeb sab hauv tuaj yeem nce, polarization siab, lub roj teeb them thiab tawm yog thaiv, yog li qhov ntsuas kub tsis zoo.

Valley Yidi, thiab lwm yam, thaum kawm txog tus nqi thiab tso tawm tus cwj pwm ntawm LifePO4 ntawm qhov kub thiab txias, Kulen efficiency yog 64% ntawm 96% thiab -20 ° C ntawm 55 ° C txog 0 ° C, thiab qhov hluav taws xob tawm ntawm 55 ° C 3.11V.

2.62V ntawm kev xa mus rau -20 ° C. XING et al, kev tshawb pom, tom qab kev sib ntxiv ntawm nanocarbon conductive agents, cov khoom siv hluav taws xob ntawm LiFePO4 txo qis, thiab kev ua haujlwm kub tsis zoo tuaj; Kev tawm hluav taws xob ntawm LiFePO4 tom qab hloov kho 3.

40 V poob rau 3.09V ntawm -25 ° C, qhov txo qis tsuas yog 9.12%; thiab nws cov roj teeb efficiency yog 57.

3%, siab dua 53.4% ​​ntawm cov hluav taws xob uas tsis yog-nanocarbon ntawm -25 ° C. Tsis ntev los no, LIMNPO4 tau nyiam cov neeg nyiam.

Txoj kev tshawb nrhiav pom tias LIMNPO4 muaj peev xwm loj (4.1V), tsis muaj kuab paug, tsis muaj nqi, muaj peev xwm loj (170mAh / g), thiab lwm yam. Txawm li cas los xij, vim qhov qis ion conductivity ntawm LIMNPO4 dua li LiFePO4, nws feem ntau siv los hloov Mn los ua LiMn0.

8Fe0.2PO4 cov khoom siv hauv kev siv tiag tiag ntawm FE feem. Cov yam ntxwv tsis zoo ntawm cov khoom siv hluav taws xob tsis zoo ntawm lithium-ion roj teeb yog qhov hnyav dua rau cov khoom siv hluav taws xob zoo, thiab qhov kub tsis zoo ntawm lithium ion roj teeb yog qhov hnyav dua, feem ntau peb yog vim li cas: ● Tsis tshua muaj kub siab magnification nqi thiab tawm, roj teeb polarization yog qhov hnyav, qhov tsis zoo ntawm cov hlau lithium feem ntau tso, thiab cov khoom siv hluav taws xob feem ntau tsis muaj electrode. cuam ​​tshuam los ntawm qhov kub thiab txias;

Txoj kev tshawb fawb ntawm cov kev daws teeb meem kub tsis tshua muaj hluav taws xob ua rau muaj txiaj ntsig ntawm kev hloov Li + hauv lithium ion roj teeb, thiab nws cov ionic conductivity thiab SEI zaj duab xis tsim kev ua tau zoo muaj txiaj ntsig zoo rau lub roj teeb uas tsis muaj qhov kub thiab txias. Nws tau txiav txim siab tias qhov ntsuas kub tsis tshua muaj hluav taws xob electrolytic yog qhov tshwj xeeb, muaj peb lub ntsiab lus qhia: ionic conductivity, electrochemical windows, thiab electrode reactivity. Cov theem ntawm peb qhov ntsuas no feem ntau yog nyob ntawm nws cov khoom siv: hnyav, electrolyte (lithium ntsev), additive.

Yog li ntawd, kev kawm txog qhov ntsuas kub tsis zoo ntawm txhua qhov ntawm cov electrolyte, yog qhov tseem ceeb rau kev nkag siab thiab txhim kho qhov ntsuas kub ntawm cov roj teeb. ● EC-raws li electrolyte tsis tshua muaj kub cov yam ntxwv piv rau saw carbonate, cov qauv cyclic carbonate yog nyob ze, muaj zog, muaj cov ntsiab lus melting siab thiab viscosity. Txawm li cas los xij, qhov loj polarity ntawm cov qauv annular ua rau nws feem ntau muaj qhov loj dielectric tas li.

EC hnyav muaj ib tug loj dielectric tas li, siab ion conductivity, zoo meej zaj duab xis tsim kev ua tau zoo, zoo tiv thaiv cov kuab tshuaj molecule los ntawm co-ntxig, thiaj li hais tias nws yog ib tug indispensable txoj hauj lwm, thiaj li hais tias feem ntau tsis tshua muaj kub electrolytic kua systems yog loj, thiab ces sib tov Low melting point ntawm me me molecule hnyav. ● Lithium ntsev yog ib qho tseem ceeb ntawm cov electrolyte. Cov ntsev lithium tuaj yeem tsis tsuas yog txhim kho cov ionic conductivity ntawm cov tshuaj, tab sis kuj txo qhov diffusion nrug ntawm Li + hauv cov tshuaj.

Feem ntau, qhov loj dua Li + concentration hauv cov tshuaj, qhov ntau dua ion conductivity. Txawm li cas los xij, qhov concentration ntawm lithium ion concentration nyob rau hauv cov electrolyte tsis yog linearly correlated, tab sis yog ib tug parabolic kab. Qhov no yog vim hais tias, lithium ion concentration nyob rau hauv cov kuab tshuaj nyob ntawm qhov dissociation ntawm lithium ntsev nyob rau hauv cov kuab tshuaj thiab lub zog ntawm lub koom haum.

Txoj kev tshawb fawb txog qhov ntsuas kub tsis tshua muaj hluav taws xob tshwj tsis yog tias lub roj teeb yog tsim los ntawm nws tus kheej, thiab cov txheej txheem hauv kev ua haujlwm tiag tiag kuj tseem muaj feem cuam tshuam rau kev ua haujlwm ntawm lub roj teeb. ● (1) Kev Npaj Txheej Txheem YAQUB li al, qhov cuam tshuam ntawm electrode load thiab txheej thickness ntawm LINI0.6CO 0.

2 mn0.2O2 / graphite roj teeb uas tsis muaj qhov kub thiab txias kev ua haujlwm tau qhia tias qhov me me ntawm cov khoom siv hluav taws xob tsawg dua, cov txheej txheej txheej yog thinner Qhov zoo dua qhov kev ua haujlwm tsis zoo. ● (2) Kev them nqi thiab kev tso tawm Petzl li al, qhov cuam tshuam ntawm qhov ntsuas kub qis-tso tawm ntawm lub roj teeb lub neej pom tau tias thaum qhov tob ntawm qhov tso tawm tuaj yeem ua rau muaj peev xwm poob ntau dua, thiab txo lub neej ntawm cov hlab ntsha.

(3) Qhov chaw saum npoo av, qhov aperture, electrode ntom ntom, wettability ntawm electrode thiab cov tshuaj electrolytic, thiab lwm yam, uas cuam tshuam rau qhov kub thiab txias ntawm lithium ion roj teeb. Tsis tas li ntawd, qhov cuam tshuam ntawm qhov tsis xws ntawm cov ntaub ntawv thiab cov txheej txheem ntawm kev ua haujlwm kub ntawm lub roj teeb tsis tuaj yeem tsis quav ntsej. Yog li ntawd, txhawm rau kom ntseeg tau tias qhov ntsuas kub tsis zoo ntawm cov roj teeb lithium-ion, nws yog ib qho tsim nyog yuav tsum ua cov hauv qab no: ● (1) tsim ib zaj duab xis nyias thiab ntom ntom SEI; ● (2) lav tias Li + muaj qhov sib txawv loj hauv cov khoom nquag; ● (3) ) Cov electrolyte muaj ion conductivity siab ntawm qhov kub thiab txias.

Tsis tas li ntawd, txoj kev tshawb no tseem tuaj yeem siv lwm txoj hauv kev, thiab lub qhov muag tig mus rau lwm hom lithium-ion roj teeb - tag nrho cov roj teeb lithium ion. Muab piv rau cov roj teeb lithium-ion lithium-ion, tag nrho cov roj teeb lithium-ion roj teeb, tshwj xeeb tshaj yog tag nrho cov khoom nyias nyias lithium ion roj teeb, xav kom daws tau qhov teeb meem muaj peev xwm attenuation thiab teeb meem kev nyab xeeb siv hauv roj teeb uas tsis kub. Yog li cas koj kho lithium roj teeb thaum lub caij ntuj no? 1.

Tsis txhob siv lub roj teeb lithium nyob rau hauv qhov kub thiab txias ib puag ncig rau cov nyhuv ntawm lithium roj teeb, qhov kub thiab txias ntawm lithium roj teeb, qhov kev ua haujlwm ntawm lithium roj teeb qis, uas ncaj qha ua rau txo qis hauv kev them nqi thiab kev ua haujlwm tawm, uas feem ntau, kev ua haujlwm ntawm lithium roj teeb kub yog li ntawm -20 degrees -60 degrees. Thaum qhov kub qis dua 0 ° C, ceev faj kom tsis txhob them rau sab nraum zoov, koj tuaj yeem them nws, peb tuaj yeem nqa lub roj teeb hauv chav (ceeb toom, nyob deb ntawm cov nplaim taws !!!), Thaum qhov kub qis dua -20 ° C, lub roj teeb yuav nkag mus rau hauv lub xeev pw tsaug zog thiab tsis tuaj yeem siv ib txwm. Yog li cov neeg siv ntawm sab qaum teb tshwj xeeb yog txias.

Tsis muaj kev them nyiaj sab hauv tsev. Txhawm rau kom siv tag nrho cov roj teeb seem, tam sim ntawd them lub hnub tom qab nres tsheb, kom them nyiaj ntau ntxiv, thiab tsis txhob muaj lithium. 2, txhim kho lub caij ntuj no tus cwj pwm, thaum lub roj teeb qis dhau lawm, peb yuav tsum ua kom lub sijhawm them nyiaj, tsim kom muaj tus cwj pwm zoo nrog, nco ntsoov, tsis txhob ua raws li lub roj teeb li qub kom rov qab mus rau lub caij ntuj no roj teeb lub zog.

Lub caij ntuj no lithium roj teeb kev ua haujlwm poob qis, yooj yim heev ua rau overcharge, maj mam cuam tshuam lub roj teeb lub neej, thiab ua rau muaj kev sib tsoo. Yog li ntawd, them nyiaj ntau dua rau kev them nyiaj hauv qhov ntiav ntiav hauv lub caij ntuj no. Tshwj xeeb tshaj yog yuav tsum tau taw qhia, tsis txhob nres lub tsheb ntev, tsis txhob overcharge.

3, tsis txhob nyob deb ntawm nco ntsoov tsis txhob them lub sijhawm ntev, tsis txhob ua kom yooj yim, muab lub tsheb ntev ntev hauv lub xeev tus nqi, thiab koj tuaj yeem ua tau. Thaum lub sij hawm them nyiaj nyob rau lub caij ntuj no tsawg dua 0 ° C, thaum them nyiaj, tsis txhob tawm mus deb dhau, tiv thaiv kev kub ntxhov, ua haujlwm raws sijhawm. 4.

Thaum them nyiaj, siv lub roj teeb lithium lub khw muag khoom tshwj xeeb uas muaj cov khoom siv tsis zoo, siv cov chargers qis dua, tuaj yeem ua rau lub roj teeb puas, thiab tseem ua rau hluav taws. Tsis txhob yuav cov khoom lag luam uas tsis muaj kev lav phib xaub, tsis txhob siv cov khoom siv lead-acid roj teeb; Yog tias koj lub charger siv tsis tau, nres siv nws, tsis txhob poob. 5, xyuam xim rau lub roj teeb lub neej, hloov raws sij hawm nyob rau hauv lub neej ntawm lithium roj teeb tshiab, ntau hom roj teeb lub neej, ntxiv rau kev siv txhua hnub, lub neej ntawm lub roj teeb tsis sib npaug, yog tias lub tsheb tsis muaj zog los yog tsis kawg luv luv, thov hu rau lithium roj teeb cov neeg ua haujlwm kho cov neeg ua haujlwm lithium roj teeb thaum lub sij hawm luv luv, thov hu rau lithium roj teeb tu cov neeg ua haujlwm.

6, muaj hluav taws xob zoo rau lub caij ntuj no, txhawm rau siv lub tsheb hauv nruab nrab lub caij nplooj ntoo hlav, yog tias koj tsis muaj lub roj teeb ntev ntev, koj yuav nco ntsoov them 50% - 80% ntawm lub roj teeb, thiab tshem tawm ntawm lub tsheb, thiab ua kom tsis tu ncua, txog li ib hlis them. Lus Cim: Lub roj teeb yog khaws cia rau hauv qhov chaw qhuav. 7.

Muab lub roj teeb kom raug Tsis txhob muab lub roj teeb tso rau hauv dej, lossis ua kom lub roj teeb ntub; tsis txhob tso ntau tshaj 7 plag tsev, los yog thim rov qab lub roj teeb kev taw qhia, lithium.