Capacity ndiyo yekutanga midziyo yebhatiri,lithium bhatiri maserokuderera kwehuwandu zvakare idambudziko rinowanzosangana mumasampuli, kugadzirwa kwehuwandu, maitiro ekukurumidza kuongorora zvikonzero zvekushomeka kwehuwandu matambudziko akasangana, nhasi kukuzivisa kwauri izvo zvinokonzeresa kushomeka kwe lithium bhatiri masero?
Kufananidzwa kwezvinhu, kunyanya pakati pe cathode ne electrolyte, kune zvakakosha pakukwanisa kwesero. Kune itsva cathode kana electrolyte itsva, kana akadzokororwa bvunzo inoratidza lithium precipitation yakaderera simba nguva dzose sero rinoedzwa, saka zvinokwanisika zvikuru kuti zvinhu pachazvo hazvina kufananidzwa. Kusapindirana kwacho kunogona kuve nekuda kweiyo SEI firimu rakaumbwa panguva yekuumbwa kusava gobvu zvakaringana, gobvu kana kusagadzikana, kana PC iri mu electrolyte ichiita kuti graphite layer ibviswe, kana dhizaini yesero kusakwanisa kuenderana nechaji hombe/ mazinga ekubuda nekuda kwekunyanyisa kwepamusoro density compaction.
Diaphragms zvakare chinhu chine simba chinogona kukonzera kushomeka kwesimba.Takaona kuti ruoko ronda diaphragms kubereka wrinkles ari longitudinal nhungamiro pakati imwe neimwe rukoko, apo lithium haina zvakakwana akanyudzwa ari negative electrode uye nokudaro kunokanganisa sero kukwanisa kumativi 3%. Kunyangwe mamwe mamodheru maviri anoshandisa semi-otomatiki mhepo inomonereka kana diaphragm kuunyana iri kushoma uye kukanganisa pahukuru kunongova 1%, haisi hwaro hwekurega kushandisa diaphragm.
Kusakwana kwemaitiro ekugadzira miganho kunogonawo kukonzera kushomeka kwehuwandu. Nekuda kwekukanganisa kweiyo yakanaka uye isina kunaka electrode coating, kukanganisa kweiyo simba divider uye kukanganisa kweiyo inonamira pane kugona, zvakakosha kubvumira imwe huwandu hwehuwandu hwekugona pakugadzira. Paunenge uchigadzira iyo yekumusoro margin, zvinokwanisika kusiya yakasara mushure mekuverenga kugona kweiyo musimboti nematanho ese chaiwo mumutsara wepakati, kana kuverenga iyo yakasara mushure mezvinhu zvese zvinokanganisa kugona kwakaitika pamuganho wakaderera. Nokuda kwezvinhu zvitsva, kuongororwa kwakarurama kwegiramu kutamba kwekathodhi muhurongwa ihwohwo kwakakosha. Iyo chikamu chekuwedzera huwandu, iyo yekuchaja yekucheka-yekubvisa ikozvino, yekuchaja / yekuburitsa yawandisa, mhando ye electrolyte, nezvimwe, zvese zvinokanganisa kutamba kwecathode giramu. Kana kukosha kwekugadzira kweiyo yakanaka giramu yekushanda kwakagadzirwa nepamusoro kuitira kuti iwane chinangwa chekugadzirisa, izvi zvinofananidzwawo nekusakwana kwekugadzirisa. Hapana chakakanganisika nekuonana kwesero, uye hapana chakaipa nedata rese rekuita, asi kugona kwesero kwakadzikira. Naizvozvo, zvinhu zvitsva zvinofanirwa kuongororwa kuti ive chaiyo cathode girama, sezvo isiri iyo cathode imwe chete ichave negirama yakafanana nechero cathode kana electrolyte.
Yakawandisa yakaipa electrode inogonawo kukanganisa kushanda kweiyo yakanaka electrode kune imwe nhanho, zvichikanganisa kugona kwesero. Negative overload haisi "chero bedzi pasina lithium precipitation". Kana iyo yakashata yakawandisa yakawedzera kusvika kune yakaderera muganho weiyo isiri-lithium precipitation overload, pachave ne 1% kusvika 2% yekuwedzera mukuita kwakanaka kwegiramu, asi kunyangwe ikawedzerwa, iyo yakashata yakawandisa ichiri kukwana kuve nechokwadi kuti. kukwanisa kubuda kwakakwirira sezvinobvira. Kana iyo yakaipa electrode yakawandisa yakawandisa, iyo yakanaka electrode ichaita basa rakaderera nekuti yakawanda isingachinjiki lithium inodiwa kune kemisitiri, asi chokwadi mukana wekuti izvi zviitike unenge hapana.
Kana iyo vhoriyamu jekiseni yemvura yadzikira, iyo inoenderana mvura yekuchengetedza vhoriyamu ichave yakaderera zvakare. Kana iyo mvura yekuchengetedza vhoriyamu yesero yakadzikira, ipapo mhedzisiro yelithium ion embedding uye de-embedding mune yakanaka uye yakaipa electrode ichakanganiswa, nekudaro ichikonzera yakaderera kugona. Kunyangwe kuchave nekushomeka kushoma pamitengo uye maitiro ane yakaderera jekiseni vhoriyamu, fungidziro yekudzikisa jekiseni vhoriyamu inofanira kunge iri yekuti haikanganisi kuita kwesero. Ehe, kudzikisa huwandu hwekuzadza kunongowedzera mukana weiyo yakaderera capacitance nekuda kwekusakwana kuchengetedza kwemvura muchitokisi, asi haisi mhedzisiro isingadzivisike. Panguva imwe cheteyo, kana kukanyanya kuoma kusveta mvura, ndipo panofanira kunge paine electrolyte yakawandisa kuti ive nechokwadi chekusangana ne electrode panguva yekunyorova kwe electrolyte. Kusakwana kwekuchengetedza kwesero kuchaita kuti ma electrode akanaka uye asina kunaka ave akaoma uye chidimbu chakaonda che lithium precipitation pamusoro pe electrode yakaipa, iyo inogona kuva chikonzero chekushaya simba nekuda kwekuchengetedza kusina kunaka.
Iyo yakavharwa zvishoma yakanaka kana yakaipa electrode inogona kukonzeresa yakaderera yepakati. Kana iyo yakanaka electrode yakavharwa zvishoma, iyo interface yeiyo yakazara chaji core haizove isina kujairika. Iyo negative electrode, semugamuchiri we lithium ions, inofanira kupa nhamba yakakura yeyakaiswa lithium nzvimbo kupfuura nhamba yelithium masosi akapihwa neiyo yakanaka electrode, kana zvisina kudaro lithium yakawandisa inodonha pamusoro peiyo negative electrode, zvichikonzera chidimbu chitete. yemamwe yunifomu lithium kunaya. Sezvambotaurwa kare, nokuti iyo yakaipa electrode uremu haigoni kutorwa zvakananga kubva pahuremu hwekubikira hwemacores, saka munhu anogona kuita imwe kuyedza kuti awane chikamu cheiyo negative electrode uremu huremu kuti abvise huremu hwekuputira kuburikidza nehuremu hwekubikira hweiyo yakaipa. electrode cores. Kana iyo negative electrode ye low capacity core ine nhete yelithium precipitation, mukana wekusakwana negative electrode yakakura. Uye zvakare, iyo cathode kana yakashata electrode yekuputira cathode divi inogonawo kukonzera yakaderera kugona, uye iyo isina kunaka electrode imwe yedivi coating inonyanya kujeka, nekuti kunyangwe iyo yakanaka electrode coating inorema, kunyangwe iyo giramu yekutamba ichadzikiswa, asi iyo yakazara chiyero kwete kuderedzwa asi inogona kuwedzera. Kana iyo yakaipa electrode yakaputirwa munzvimbo isiri iyo, kuenzanisa kwakananga kwehuremu hwehuremu hweimwe uye mbiri mativi mushure mekubika, chero data rakafanana neA side iri 6% yakareruka kupfuura B side coating, inogona. kunyanya kuona dambudziko, hongu, kana dambudziko rekushomeka kwesimba rakanyanya, zvakakosha kuti uwedzere kudzoreredza iyo chaiyo yepasi density yedivi reA / B. Kana dambudziko rekushomeka kwesimba rakakomba, zvinodikanwa kuti uenderere mberi infer chaiyo density yeA/B side. Rolling inoparadza chimiro chezvinyorwa, izvo zvinokanganisa kukwanisa. Iyo molecular kana atomiki chimiro chechinhu ndicho chikonzero chakakosha nei iine zvimiro zvakaita senge simba, voltage, nezvimwewo. Kana iyo density yeyakanaka electrode rolls ichipfuura kukosha kwemaitiro, iyo yakanaka electrode inopenya zvakanyanya kana musimboti wabviswa. Kana iyo yakanaka electrode compaction yakakura kwazvo, iyo yakanaka electrode chidimbu chiri nyore kutyora mushure memhepo, izvo zvinokonzeresa kushoma kugona. Zvisinei, sezvo iyo yakanaka electrode compaction ichaita kuti chidimbu chedanda chityoke chikangopetwa, iyo yakanaka electrode roller press pachayo inoda kumanikidzika kwakawanda, saka kuwanda kwekusangana kwakanaka kwe electrode compaction kwakaderera zvikuru kudarika kusakanganiswa kwe electrode. Kana iyo electrode isina kunaka ikaumbwa, tambo kana block ye lithium precipitation ichaita pamusoro peiyo negative electrode, uye huwandu hwemvura inochengeterwa mukati huchadzikiswa zvakanyanya.
Kuderera kwehuwandu kunogonawo kukonzerwa nehuwandu hwemvura. Low capacitance inogoneka kana mvura ye electrode isati yazadza, dova rebhokisi regirovhosi risati razadza, mvura ye electrolyte inodarika mwero, kana kana mwando ukaiswa mu de-aerated yechipiri chisimbiso. Kutsvaga huwandu hwemvura hunodiwa pakuumbwa kwepakati, asi kana mvura ikadarika imwe kukosha, iyo yakawandisa mvura inokuvadza iyo SEI firimu uye inopedza iyo lithium munyu mu electrolyte, nokudaro kuderedza kugona kwepakati. Mvura inodarika mwero we cell full charge negative kosi diki diki rebrown.
Nguva yekutumira: Aug-16-2022