Cov Roj Teeb Supercapacitor Ua Haujlwm Li Cas
Nyob rau hauv qhov kev thov kom muaj zog ntau zuj zus—los ntawm cov tsheb fais fab thiab cov khoom siv hluav taws xob nqa tau mus rau cov tshuab khaws cia zog rov ua dua tshiab—cov thev naus laus zis khaws cia zog kuj hloov pauv sai sai. Cov roj teeb tshuaj lom neeg xws li lithium-ion tau tswj hwm kev lag luam rau lawv lub peev xwm khaws cia ntau lub zog. Txawm li cas los xij, lwm yam thev naus laus zis tab tom nyiam mloog rau nws lub peev xwm them thiab tso tawm sai heev thiab rau lub sijhawm ntev heev: supercapacitors. Ntau tus neeg hu lawv ua "supercapacitor roj teeb," txawm hais tias lawv tsis yog roj teeb hauv qhov kev nkag siab tias lawv cuam tshuam nrog cov tshuaj lom neeg uas khaws cia zog. Yog li, supercapacitors ua haujlwm li cas, thiab vim li cas lawv thiaj suav tias yog qhov kev daws teeb meem tseem ceeb rau yav tom ntej?
Supercapacitor yog dab tsi?
Cov Supercapacitors (feem ntau hu ua ultracapacitors) yog cov khoom siv khaws cia lub zog uas poob qee qhov ntawm cov capacitors ib txwm muaj thiab cov roj teeb. Cov capacitors ib txwm muaj tuaj yeem them thiab tso tawm sai heev, tab sis lawv lub peev xwm zog me me. Cov roj teeb tuaj yeem khaws cia ntau lub zog, tab sis lawv them thiab tso tawm qeeb qeeb thiab muaj lub neej voj voog txwv.
Cov supercapacitors sim siv qhov zoo ntawm cov capacitors: them sai, tso tawm sai, thiab lub neej ntev, thaum ua kom lawv lub peev xwm khaws cia hluav taws xob ntau dua li cov capacitors ib txwm muaj. Yog li ntawd, cov supercapacitors zoo rau cov ntawv thov uas xav tau kev tawg hluav taws xob, kev nres rov qab, kev ruaj khov hluav taws xob, thiab kev thaub qab hluav taws xob luv luv.
Cov Cheebtsam Tseem Ceeb ntawm Supercapacitors
Yuav kom nkag siab txog nws ua haujlwm li cas, peb yuav tsum paub txog cov khoom tseem ceeb ntawm lub supercapacitor:
1. Ob lub electrodes (zoo thiab tsis zoo), feem ntau yog ua los ntawm cov khoom siv carbon porous xws li activated carbon, graphene, lossis carbon nanotubes. Cov ntaub ntawv no raug xaiv vim tias lawv muaj thaj chaw loj heev.
2. Cov electrolytes, uas yog cov kua lossis cov gels uas muaj cov ions (cov nqi zoo thiab cov nqi tsis zoo) uas tuaj yeem txav mus los.
3. Lub cuab yeej cais, ib txheej nyias nyias uas cais ob lub electrodes kom tiv thaiv kev luv luv, tab sis tseem tso cai rau cov ions txav mus los.
4. Lub cuab yeej sau tam sim no, uas txuas cov electrodes rau lub voj voog sab nraud kom cov electrons tuaj yeem ntws.
Tus yuam sij rau cov supercapacitors yog lawv qhov chaw loj heev ntawm electrode. Xav txog ib gram ntawm cov pa roj carbon uas muaj qhov porous, uas tuaj yeem muaj thaj chaw ntawm thaj chaw football. Qhov loj dua ntawm qhov chaw, qhov ntau dua nws tuaj yeem tuav.
Lub Ntsiab Cai Tseem Ceeb: Khaws Lub Zog Tsis Muaj Cov Tshuaj Lom Zem Tseem Ceeb
Cov roj teeb khaws lub zog los ntawm cov tshuaj lom neeg: cov ions nkag mus rau hauv cov qauv electrode (intercalation) thiab tsim cov tshuaj sib txuas tshwj xeeb. Supercapacitors txawv. Hauv supercapacitors, lub zog feem ntau khaws cia los ntawm kev sib cais them (electrostatic cia), es tsis yog cov tshuaj lom neeg uas ua rau cov khoom puas tsuaj loj heev.
Thaum lub supercapacitor raug them, cov electrons raug yuam kom sib sau ua ke ntawm ib lub electrode (piv txwv li, lub electrode tsis zoo), thaum lwm lub electrode tsis muaj electrons (ua zoo). Qhov sib txawv ntawm qhov them no tsim ib qho voltage, thiab lub zog khaws cia rau hauv lub teb hluav taws xob.
Yuav kom sib npaug qhov them, cov ions hauv electrolyte txav mus ze rau ntawm qhov chaw electrode uas them rov qab. Cov txheej txheem no tsim qhov hu ua txheej hluav taws xob ob txheej.
Lub Tshuab Tseem Ceeb: Fais Ob Chav Txheej Capacitance (EDLC)
Hom supercapacitor uas siv ntau tshaj plaws yog EDLC (Electric Double-Layer Capacitor). Lub tshuab ua haujlwm yog raws li nram no:
1. Thaum them nyiaj:
- Lub zog hluav taws xob thawb cov electrons mus rau hauv cov electrode tsis zoo.
- Lub electrode tsis zoo yuav nplua nuj nyob rau hauv electrons.
– Cov ions zoo (cations) hauv cov electrolyte raug rub thiab sib sau ua ke ze ntawm qhov chaw ntawm cov electrode tsis zoo.
- Tib lub sijhawm, lub electrode zoo poob cov electrons.
– Cov ions tsis zoo (anions) raug rub thiab sib sau ua ke rau ntawm qhov chaw ntawm lub electrode zoo.
2. Ib qho "txheej ob chav hluav taws xob" tau tsim:
– Nyob rau saum npoo ntawm lub electrode muaj ob txheej: ib txheej ntawm cov nqi los ntawm lub electrode, thiab ib txheej ntawm cov nqi ion los ntawm cov electrolyte.
- Qhov deb ntawm ob txheej no me heev (nanometer scale), yog li ntawd lub capacitance nce ntau heev.
3. Thaum tso tawm:
- Cov electrons ntws los ntawm lub voj voog sab nraud kom ua haujlwm (qhib lub cev muaj zog, tswj qhov hluav taws xob, thiab lwm yam).
- Cov ions tawg rov qab mus rau hauv electrolyte, thiab lub kaw lus rov qab mus rau lub xeev nruab nrab.
Vim tias cov txheej txheem no yog lub cev ntau dua (kev hloov pauv thiab kev tswj hwm) dua li kev tshuaj lom neeg nyuaj, cov supercapacitors tuaj yeem:
- sau ua vib nas this mus rau feeb,
- tso tawm lub zog loj heev tam sim ntawd,
- muaj sia nyob ntau pua txhiab txog ntau lab lub voj voog.
Pseudocapacitance: "Me ntsis Chemistry" rau ntau lub peev xwm
Ntxiv rau EDLCs, muaj cov supercapacitors uas siv pseudocapacitance, uas yog qhov khaws cia ntawm cov nqi los ntawm cov tshuaj redox ceev ceev ntawm qhov chaw electrode. Cov ntaub ntawv siv feem ntau suav nrog cov hlau oxides (piv txwv li, RuO₂, MnO₂) lossis cov polymers conductive.
Qhov txawv nrog lub roj teeb:
- Cov tshuaj tiv thaiv hauv pseudocapacitors feem ntau tshwm sim ntawm qhov chaw (lossis ze ntawm qhov chaw) thiab ceev heev.
- Tsis tob npaum li kev sib xyaw roj teeb, yog li nws tuaj yeem siv tau ntev dua, txawm hais tias feem ntau tsis ntev npaum li EDLC ntshiab.
Hauv kev xyaum, ntau lub supercapacitors niaj hnub no yog hybrids, sib txuas EDLC thiab pseudocapacitance los ua kom lub zog thiab lub zog zoo dua.
Vim li cas cov Supercapacitors thiaj li them tau sai ua luaj?
Cov supercapacitors them sai sai vim tias lawv tsis tas yuav muaj kev tshuaj lom neeg ntau lossis kev hloov pauv loj. Qhov tshwm sim tseem ceeb yog:
- cov ions txav mus ze rau ntawm qhov chaw electrode,
- cov electrons sib sau ua ke ntawm cov electrodes;
– ob txheej yog tsim.
Qhov no zoo li sau ib qho "kaw them" rau ntawm qhov chaw, es tsis yog "nias" cov ions rau hauv ib lub lattice siv lead ua zoo li hauv cov roj teeb lithium-ion. Lawv qhov kev tiv thaiv sab hauv kuj feem ntau qis, tso cai rau cov dej ntws loj yam tsis tsim cua sov ntau dhau (txawm hais tias tseem muaj cov kev txwv tsim).
Cov Zoo thiab Cov Tsis Zoo Piv rau Cov Roj Teeb
Cov txiaj ntsig tseem ceeb:
1. Them sai heev (them fais fab siab).
2. Lub zog tso zis loj (lub zog ceev ceev), tsim nyog rau kev thauj khoom nce siab.
3. Lub neej voj voog ntev heev, nws tuaj yeem ua tau ntau pua txhiab zaus.
4. Tiv taus qhov kub thiab txias heev hauv qee cov qauv tsim.
5. Kev ua haujlwm zoo thaum lub sijhawm them sai-tso tawm.
Cov teeb meem tseem ceeb:
1. Lub zog khaws cia tsawg dua li cov roj teeb (qhov ceev ntawm lub zog tsawg). Cov supercapacitors tsis zoo tagnrho rau kev muab lub zog ntev, xws li cov roj teeb laptop.
2. Lub zog hluav taws xob poob qis linearly thaum siv. Tsis zoo li cov roj teeb, uas tswj tau lub zog hluav taws xob ruaj khov, cov supercapacitors yuav poob ntawm, piv txwv li, 2,7 V mus rau xoom thaum lub zog raug tso tawm, feem ntau xav tau DC-DC converter.
3. Kev tso tawm tus kheej siab dua: qhov them feem ntau "xaus" sai dua li cov roj teeb.
4. Tus nqi ib Wh tseem kim dua piv rau cov roj teeb rau cov ntawv thov khaws cia hluav taws xob loj.
Yog li ntawd, cov supercapacitors feem ntau tsis yog hloov cov roj teeb, tab sis yog ib qho kev ntxiv.
Piv txwv ntawm Daim Ntawv Thov Hauv Ntiaj Teb Tiag
Cov supercapacitors siv dav hauv cov xwm txheej uas xav tau lub zog loj hauv lub sijhawm luv luv, piv txwv li:
– Cov tsheb fais fab thiab kev thauj mus los (EV/HEV): pab kom lub tsheb nrawm dua lossis nqus tau lub zog thaum lub sijhawm nres tsheb rov qab, txo qhov hnyav ntawm lub roj teeb.
– Qee lub tsheb npav thiab tsheb ciav hlau: qee lub tshuab siv cov supercapacitors rau kev them ceev ntawm qhov chaw nres tsheb.
– UPS thiab lub zog thaub qab luv luv: ua rau lub kaw lus muaj sia nyob rau ob peb feeb mus rau ob peb feeb, txaus rau kev hloov pauv lossis kaw kom muaj kev nyab xeeb.
- Cov khoom siv hauv kev lag luam: rau cov khoom siv siab tshaj plaws (kev txiav cov khoom siv siab tshaj plaws) kom cov khoom siv hluav taws xob ruaj khov dua.
– Qee cov khoom siv hluav taws xob rau cov neeg siv khoom: kev them ceev thiab cov yam ntxwv ntawm lub zog rau cov khoom siv uas xav tau hluav taws xob ntau.
Kev kaw
Cov supercapacitors ua haujlwm raws li lub hauv paus ntsiab lus ntawm kev khaws cia lub zog los ntawm kev sib cais them - feem ntau los ntawm kev tsim cov txheej hluav taws xob ob txheej ntawm qhov chaw ntawm lub electrode porous, thiab hauv qee hom, pab los ntawm cov tshuaj redox sai (pseudocapacitance). Vim tias lub tshuab yog "lub cev" ntau dua li cov tshuaj lom neeg tob, cov supercapacitors zoo tshaj plaws hauv kev them ceev ceev, lub zog tso zis siab, thiab lub neej ua haujlwm ntev heev. Txawm li cas los xij, lawv cov zog tsawg ua rau lawv tsim nyog dua li tus khub rau roj teeb, es tsis yog hloov pauv tag nrho.
Saib mus tom ntej, kev tshawb fawb txog cov ntaub ntawv xws li graphene, nanostructured carbon, thiab hybrid designs muaj peev xwm ua rau lub zog ntawm cov supercapacitors ntau ntxiv. Yog tias cov kev nce qib no txuas ntxiv mus, cov supercapacitors tuaj yeem ua lub luag haujlwm tseem ceeb hauv lub zog niaj hnub no - tshwj xeeb tshaj yog rau cov ntawv thov uas xav tau kev ua haujlwm zoo, teb sai, thiab ua haujlwm ntev.
