Te Whakarewa i roto i te Hanga Pūhiko Lithium Ion
Kua noho ngā pākahiko lithium-ion hei poutokomanawa mō ngā hangarau hou, mai i ngā waea atamai me ngā pona ki ngā waka hiko me te rokiroki hiko nui. Kei muri i te whakapai tonu o te mahi a ngā pākahiko—he māmā ake, he nui ake te kaha, he roa ake te mau—ko te mahi nui a te mahi whakarewa. Ehara i te mea ko te whakarewa whakarewa anake te mahi whakarewa, engari ko te tukanga katoa o te tango, te purenga, te hanga hanganga rauemi, te whakahaere hapa, me te hangarua. I roto i te horopaki o ngā pākahiko lithium-ion, he mahi tā te mahi whakarewa ki te whiriwhiri me te tukatuka i ngā rauemi mata, te hanga rauemi cathode me te anode, te hanga wāhanga, me te whakahaere i te mutunga o te ora o te pākahiko.
1. Te tūranga o te mahi whakarewa i roto i te mekameka tuku pākahiko
Ka tīmata te mekameka tuku pākahiko lithium-ion mā te keri i ngā rauemi e whai ake nei: lithium (Li), nikara (Ni), kobalta (Co), manganese (Mn), rino (Fe), konumohe (Al), parahi (Cu), me te karāpeti (C). He mahi nui tā te mahi whakarewa ki te huri i te konganuku hei matū me ngā hua whakarewa tino parakore. Hei tauira, e hiahiatia ana te parahi me te konumohe hei kaikohi iahiko, ko te nikara, te kobalta, te manganese, me te rino ngā huānga matua o te rauemi katote. Me tukatuka te lithium tonu hei hanga i ngā matū e tika ana (hei tauira, Li2CO3, LiOH rānei) mō te hanga katote.
I roto i te ao pākahiko, he tino teitei ngā whakaritenga mō te parakore. Ka taea e ngā poke pēnei i te rino kore utu, te pūhaumāota, ētahi huānga iti rānei te whakararuraru i te pumau hikohiko, te whakararu i te pirau, tae atu ki te whakanui ake i te mōrearea o te pakaru wera. Nō reira, he wāhi nui tā te mahi whakarewa ki te whakamahine, ki te whakahaere i te poke, me te whakatikatika i te āhua ā-tinana o ngā rauemi—mai i ngā paura pai ki ngā pepa whakarewa.
2. Te tango me te whakamahine i te rīhiuma: mai i te pūtake ki te rauemi pākahiko
Ko ngā pūtake matua o te lithium ko te tote (he wai tote whai kohuke) me ngā toka mārō pērā i te spodumene. I roto i te tote, ka whakaemihia te lithium mā te mimiti me ngā tauhohenga matū hei whakaputa i te lithium carbonate. I roto i te spodumene, ka tunua te konganuku hei whakarerekē i te āhua tioata kia māmā ake ai te tango i te lithium, ā, muri iho ka horoia me te whakatōngia.
He tauira ēnei o ngā mahi whakarewa tango, tae atu ki te pyrometallurgy (e whakamahi ana i ngā pāmahana teitei) me te hydrometallurgy (e whakamahi ana i ngā otinga). Ko te kōwhiringa o te ara tukanga e whakawhirinaki ana ki te pūtake, ngā utu pūngao, te wātea o te matū, me te pānga ki te taiao. Ko ngā pākahiko hou—ina koa ko ērā he katote whai nikara—e hiahia ana ki te LiOH kounga teitei, ā, ka kaha ake te tukanga whakamahine.
3. Ngā rauemi katote: te hangarau koranu me te hanganga karaihe
Ahakoa he maha ngā wā he mea hanga te anode ki te karāpiti, ko te katote te "ngakau" pūngao o te pākahiko, e whakawhirinaki nui ana ki ngā konganuku whakawhiti. Ko ngā rauemi katote noa ko:
– LFP (LiFePO4): e whakawhirinaki ana ki te rino me te phosphate, e mōhiotia ana he pumau, he haumaru hoki.
– NMC (LiNixMnyCozO2) me te NCA (LiNiCoAlO2) : he nui te nikara mō te kiato pūngao teitei.
– LMO (LiMn2O4): he mea hanga ki te konupora, he iti ake te utu engari he uaua te huringa me te pumau.
He mahi nui tā te hangarau whakarewa rauemi ki te whakahaere i te hanganga, te rahi o te matūriki, te āhua, me te āhua o te tioata. Ko ngā katote te tikanga ka hangaia mā te hanga i ngā rauemi mua (hei tauira, ngā hauwaiwai Ni-Mn-Co, ngā warowaihā rānei) ka whakapūkarahia ki te pūtake lithium i ngā pāmahana teitei. Ko te pāmahana, te āhuarangi (hāora/koretake), te wā pupuri, me te tere whakamatao ka whakatau i te hanganga o te hanganga paparanga, spinel, olivine rānei e tika ana.
Koinei te wāhi e tino hira ai ngā ariā whakarewa pēnei i te horapa totoka, te whakawhiti āhua, me te whakahaere witi. Hei tauira, me whai hanganga paparanga pai ngā katote NMC kia taea ai e ngā katote lithium te neke ki roto, ki waho hoki. Ka taea e ngā hapa pēnei i te ranunga katione i waenga i te Ni me te Li te whakaiti i te kaha me te whakatere i te pirau.
4. Ngā take o te anode, te kaikohi au, me te waikura
Ko te karāpiti te anode tino kitea, engari kei te piki haere te au ki ngā anode e hangai ana ki te silicon (Si) me ngā koranu karāpiti-silicon rānei mō ngā kaha teitei ake. Ahakoa ehara te silicon i te arotahi o te mahi whakarewa tuku iho, kei te whai tikanga tonu ngā mātāpono o te mahi whakarewa rauemi: te whakahaere i te rahi o te matūriki, te pakaru, me te pumau o te atanga nā te nui o te whakawhanuitanga o te rōrahi i te wā e utu ana.
Ko te wāhanga whakarewa e kitea mārama ana ko te kaikohi au:
– He pepa konutea parahi (Cu) mō te anode.
– Pepa konumohe (Al) mō te katote.
Ko te kounga o te pepa konutea ka whakatauhia e ngā tukanga whakarewa pēnei i te hurihuri, te whakamahana, te whakahaere matotoru, te taratara o te mata, me te parakore. Ka pāngia te piri o te para o te hiko e te taratara rawa, te poke rānei. Hei tāpiri, he take nui anō hoki te waikura. Ka mahi ngā hiko i roto i ngā irahiko waro me ngā tote pēnei i te LiPF6, ka taea te whakaputa i ngā momo tauhohe (hei tauira, te HF i raro i ētahi āhuatanga), ā, ko te ātete ki te waikura me te pumau o te paparanga mata te mea nui ki te haumaru.
5. Te hanga whakarewa paura me te hanga hiko
Ko te hanga irahiko ko te whakaranu i te rauemi hohe (katode/anode), te arataki (pango waro), me te here (hei tauira, PVDF, here wai rānei) ki roto i te paru, kātahi ka pania ki runga i te pepa whakarewa. Kia maroke, ka whakakīia te irahiko mā te kalena kia tutuki ai he mātotoru motuhake.
Mai i te tirohanga whakarewa paura, he rite tēnei tukanga ki te hangarau rauemi e ahu mai ana i te matūriki: ko te tohatoha rahi matūriki, te porosity, me te whatunga kawe hiko e whakatau ana i te mahi. Me rawaka te porosity kia taea ai te uru o te electrolyte, engari kaua e nui rawa kia mau tonu ai te kiato pūngao. He mea nui te whakahaere i te hanganga moroiti o te electrode—he maha ngā wā ka tātarihia mā te whakamahi i te SEM, XRD, me ētahi atu tikanga tautuhi—kia mau tonu ai te whakaputanga.
6. Ngā taunekeneke atanga me te rahunga: ngā dendrite, ngā kapiti, me te pirau
Ahakoa ehara ngā pākahiko lithium-ion i te "konganuku parakore", he maha o ā rātou āhuatanga pakaru e pā ana ki te whanonga o ngā rauemi me ngā atanga, e taka ana ki roto i te ao o te konganuku ā-tinana. Hei tauira:
– Te hanganga o te paparanga SEI (Solid Electrolyte Interphase) i runga i te anode: he mea nui tēnei paparanga hei tiaki i te anode, engari ki te kore e pumau, ka taea tonu e ia te tipu me te kai i te lithium.
– Te ngatata o ngā matūriki katote, inā koa i roto i ngā rauemi whai kiko-nikara, nā runga i ngā ahotea o roto i te wā e huri ana.
– Te whakakikoruatanga o te lithium ki te anode i te wā e tere ana te utu, i te pāmahana iti rānei, ka taea e tēnei te whakaoho i te hanganga o te dendrite me te mōrearea o ngā ara iahiko poto.
Mā te hangarau whakarewa ka āwhina i te hangarau mata (ngā paninga), te tāpiri i ngā huānga motuhake hei whakau i te hanganga, me te whakahaere i te ahotea toenga. He mea tino noa te huarahi "hoahoa hanganga-iti": te arotau i ngā rauemi i te taumata moroiti hei whakanui ake i te mahi i te taumata whānui.
7. Te hangarua pākahiko: te keri tāone me te ōhanga porowhita
He mara hangarau whakarewa te hangarua o ngā pākahiko lithium-ion. Ina tae ki te mutunga o te oranga mahi o ngā pākahiko, ka noho te ihirangi Ni, Co, Cu, tae atu ki te Li hei rauemi whai hua. Ko te tukanga hangarua koia ēnei:
– Te Whakakotahitanga Pūmua: Ka whakarewahia ngā pākahiko hei whakaputa i ngā koranu whakarewa (te nuinga ko te Ni-Co-Cu) me te para. He pakari, he ngāwari hoki tēnei tukanga, engari he nui te pūngao e hiahiatia ana, ā, he maha ngā wā ka uru te konukōre ki roto i te para, me ētahi atu mahi anō.
– Te waiwhakarewa: ka whakamahia te wairewa hei whakarewa i ngā konganuku, ka wehea mā te whakamakuku, te tango whakarewa, te whakamātao hiko rānei. Ka taea te whakaputa i te parakore teitei, engari me tika te whakahaere i te otinga me te para.
– Te hangarua tika: e ngana ana ki te pupuri i te hanganga katote kia taea ai te hanga hou me te kore e "whakangaromia" ngā huānga katoa hei katote. Ka tukuna he whai huatanga engari he uaua nā ngā rerekētanga o te hoahoa pākahiko me te pirau o ngā rauemi.
Mai i te tirohanga whakarewa, ko ngā wero matua ko te wehenga whiriwhiri, te whakahaere i te poke, me te whakarite kia tutuki i ngā hua hangarua ngā whakaritenga pakari o ngā rauemi pākahiko hou.
8. Ngā wero me ngā huarahi ā muri ake nei
I ngā rā kei te heke mai, ka nui haere te hiranga o te whakarewa i roto i ngā pākahiko lithium-ion i te mea ka piki ake te tono, ā, ka kaha ake ngā paerewa pumau. Ko ngā huarahi matua ko te whakaiti i te cobalt mō ngā take matatika me te utu, te whakanui ake i te whakamahinga o te nickel, e hiahia ana kia tika ake te whakahaere hanganga moroiti, te whakawhanaketanga o ngā cathode LFP me LMFP mō te iti ake o te utu me te haumaru, me te whakauru i te hangarua hei puna rauemi mata matua. Hei tāpiri, ko ngā auahatanga tukanga—pērā i te whakapai ake i te taiao, te whakamahinga o ngā matū hangarua, me te whakaiti i te tapuwae waro—ka noho hei mea nui ki te whakataetae a te umanga.
Whakamutunga
Ko te mahi whakarewa te pūtake huna i muri i te whanaketanga o ngā pākahiko lithium-ion. Mai i te tango me te purenga o te lithium me ngā konganuku whakawhiti, mā te hanga i te hanganga karaihe cathode, te hanga o ngā pepa kohi au, me te whakahaere i ngā atanga e whakatau ana i te roa o te ora, ki te hangarua me te ōhanga porowhita, me mārama katoa ki te mahi whakarewa. I te pikinga ake o ngā waka hiko me te whakawhiti pūngao o te ao, ka nui haere te rautaki o te mahi whakarewa: te whakarite i te wātea o ngā rauemi mata, ngā tukanga whakaputa whai hua, te mahi pākahiko tino pai, me te pānga taiao e whakahaeretia ana. Mena ko ngā pākahiko te tohu o te heke mai o te pūngao, ko te mahi whakarewa tētahi o ngā miihini matua e taea ai taua heke mai.
