Puas yog cov kua siv lead ua kua electrolytes hauv lithium-ion roj teeb ua rau nws muaj peev xwm tsim cov lithium hlau ruaj khov?
Txheem
Ib qho kev kawm nthuav los ntawm Carnegie Mellon University. Cov kws tshawb fawb tau thov kom siv cov kua ua kua hauv cov lithium-ion los ua kom lawv lub zog ceev, ruaj khov thiab muaj peev xwm them nyiaj. Txoj haujlwm tseem tsis tau ua tiav, yog li peb yuav tos tsawg kawg tsib xyoos kom tiav - yog tias ua tau.
Cov kua siv lead ua kua tau hloov pauv cov lus qhia, tam sim no lawv tuaj yeem pab roj teeb
Cov txheej txheem
- Cov kua siv lead ua kua tau hloov pauv cov lus qhia, tam sim no lawv tuaj yeem pab roj teeb
- Cov kua nplaum ua kua ua kom yuam kev kom tau cov kua-kua electrolyte
Nyob rau hauv luv luv: lithium-ion cell manufacturers tam sim no tab tom nrhiav kom lub zog ceev ntawm cov hlwb thaum tswj los yog txhim kho cell kev ua tau zoo, xws li, piv txwv li, kev txhim kho stability ntawm lub hwj chim ntau dua. Lub tswv yim yog ua kom cov roj teeb sib dua, nyab xeeb dua, thiab nrawm dua kom rov qab tau. Ib me ntsis zoo li tus ceev-pheej yig-zoo daim duab peb sab.
Ib txoj hauv kev los ua kom muaj zog tshwj xeeb ntawm cov hlwb (los ntawm 1,5-3 zaug) yog kev siv cov anodes ua los ntawm lithium hlau (Li-hlau).... Tsis yog carbon lossis silicon, zoo li ua ntej, tab sis lithium, ib qho khoom siv ncaj qha rau lub peev xwm ntawm tes. Qhov teeb meem yog tias qhov kev npaj no sai sai tsim cov lithium dendrites, hlau protrusions uas dhau sij hawm txuas ob lub electrodes, ua rau lawv puas tsuaj.
Cov kua nplaum ua kua ua kom yuam kev kom tau cov kua-kua electrolyte
Kev ua haujlwm tam sim no tab tom npaj ntim cov anodes hauv ntau cov ntaub ntawv los tsim ib lub plhaub sab nraud uas tso cai rau cov dej ntws ntawm lithium ions tab sis tsis tso cai rau cov khoom tsim kom loj hlob. Ib qho kev daws teeb meem rau qhov teeb meem kuj yog kev siv cov khoom siv electrolyte - ib phab ntsa uas dendrites tsis tuaj yeem nkag mus.
Cov kws tshawb fawb ntawm Carnegie Mellon University coj ib txoj hauv kev sib txawv: lawv xav nyob nrog cov pov thawj ua kua electrolytes, tab sis raws li cov kua siv lead ua kua. Cov kua dej ua kua yog cov qauv uas yog ib nrab ntawm cov kua thiab cov muaju, uas yog, cov khib nyiab nrog cov qauv txiav txim. Cov kua nplaum ua kua yog kua, tab sis lawv cov molecules raug txiav txim siab heev (qhov chaw).
Nyob rau theem molecular, cov qauv ntawm cov kua siv lead ua kua electrolyte tsuas yog cov qauv crystalline thiab yog li thaiv kev loj hlob ntawm dendrites. Txawm li cas los xij, peb tseem cuam tshuam nrog cov kua dej, uas yog, ib theem uas tso cai rau ions ntws ntawm cov electrodes. Dendrite kev loj hlob yog thaiv, loads yuav tsum ntws.
Qhov no tsis tau hais nyob rau hauv txoj kev tshawb no, tab sis cov kua siv lead ua kua muaj lwm yam tseem ceeb: ib zaug hluav taws xob siv rau lawv, lawv tuaj yeem teem caij rau hauv ib qho kev txiav txim (raws li koj tuaj yeem pom, piv txwv li, los ntawm saib cov lus no thiab ciam teb ntawm cov xim dub. cov ntawv thiab lub teeb tom qab). Yog li nws yuav tshwm sim thaum lub xov tooj ntawm tes pib them, cov kua siv lead ua kua molecules yuav nyob ntawm lub kaum sab xis sib txawv thiab "scrape" dendritic deposits los ntawm electrodes.
Visually, qhov no yuav zoo li lub kaw ntawm lub flaps, hais, nyob rau hauv lub qhov cua qhov.
Lub downside ntawm qhov xwm txheej yog qhov ntawd Carnegie Mellon University nyuam qhuav pib tshawb fawb txog cov electrolytes tshiab... Nws twb paub lawm hais tias lawv cov stability yog qis dua li cov pa electrolytes kua. Cell degradation tshwm sim sai dua, thiab qhov no tsis yog qhov kev taw qhia uas nyiam peb. Txawm li cas los xij, nws muaj peev xwm hais tias dhau sij hawm qhov teeb meem yuav raug daws. Tsis tas li ntawd, peb tsis cia siab tias qhov tshwm sim ntawm cov khoom siv hauv lub xeev ua ntej tshaj li ib nrab xyoo caum xyoo:
> LG Chem siv sulfides hauv lub xeev cov hlwb. Khoom siv hluav taws xob ua lag luam tsis pub dhau 2028
Introductory Diam duab: txheej txheem ntawm kev tsim ntawm lithium dendrites ntawm electrode ntawm microscopic lithium-ion cell. Daim duab tsaus nti loj nyob rau saum toj yog qhov thib ob electrode. Thawj "npuas" ntawm lithium atoms ntawm qee qhov taw tes ya mus, tsim "whiskers" uas yog lub hauv paus ntawm qhov tshwm sim dendrite (c) PNNL Unplugged / YouTube:
Qhov no yuav txaus siab rau koj:
