Ukwakhiwa kwebhethri ye-lithium-ion

Ukwakhiwa nokugaywa kabusha kwebhethri ye-lithium-ion

Iibhethri ye-lithium-ionyakhiwa i-eletrolyte, isihlukanisi, i-cathode ne-anode kanye necala.

I-electrolyteebhethri ye-lithium-ion ingaba ijeli noma i-polymer, noma ingxube yejeli ne-polymer.

I-electrolyte kumabhethri e-Li-ion isebenza njengendawo yokuthutha ama-ion ebhethrini.Ngokuvamile iqukethe usawoti we-lithium kanye ne-organic solvents.I-electrolyte idlala indima ebalulekile ekuthuthweni kwe-ion phakathi kwama-electrode alungile noma angalungile ebhethri ye-lithium-ion, iqinisekisa ukuthi ibhethri ingakwazi ukuzuza amandla kagesi aphezulu kanye nokuminyana kwamandla aphezulu.I-electrolyte ngokuvamile yakhiwa ngama-high-purity organic solvents, usawoti we-lithium electrolyte kanye nezithasiselo ezidingekayo ezihlanganiswe ngokucophelela ngezilinganiso ezithile ngaphansi kwezimo ezithile.

Izinto ze-cathodeizinhlobo zebhethri ye-lithium-ion:

• I-LiCoO2
• Li2MnO3
• I-LiFePO4
• I-NCM
• I-NCA

 Izinto ze-cathode ziqukethe izindleko ezingaphezu kuka-30% zebhethri lonke.

I-anodeyebhethri ye-lithium-ion iqukethe

Khona-ke i-anode yebhethri ye-lithium-ion iqukethe cishe amaphesenti angu-5-10 wezindleko zebhethri lonke.Izinto ze-anode ezisuselwa kukhabhoni ziyizinto ezisetshenziswa kakhulu ze-anode kumabhethri e-lithium-ion.Uma iqhathaniswa ne-lithium anode yensimbi yendabuko, inokuphepha okuphezulu nokuzinza.Izinto ze-anode ezisuselwa kukhabhoni zivela ikakhulukazi kugraphite yemvelo neyokwenziwa, i-carbon fiber nezinye izinto.Phakathi kwazo, i-graphite iyinto eyinhloko, enendawo ephezulu ethize ephezulu kanye ne-conductivity kagesi, nezinto zekhabhoni nazo zinokuzinza okuhle kwamakhemikhali kanye nokusebenziseka kabusha.Kodwa-ke, umthamo wezinto ze-electrode ezingezinhle ezisekelwe kukhabhoni uphansi kakhulu, ongakwazi ukuhlangabezana nezidingo zezinye izinhlelo zokusebenza zomthamo ophezulu.Ngakho-ke, okwamanje kukhona ucwaningo oluthile mayelana nezinto ezintsha zekhabhoni nezinto eziyinhlanganisela, ngethemba lokuqhubeka nokwenza ngcono umthamo kanye nempilo yomjikelezo wezinto ezisekelwe ku-carbon-electrode negative.

Isenayo i-silicon-carbon negtive electrode material.I-Silicon (Si) impahla: Uma kuqhathaniswa nama-electrode endabuko ekhabhoni, ama-electrode ama-silicon negative anomthamo othize ophakeme kanye nokuminyana kwamandla.Kodwa-ke, ngenxa yezinga elikhulu lokunwetshwa kwezinto ze-silicon, kulula ukubangela ukwanda kwevolumu ye-electrode, ngaleyo ndlela kufinyeze impilo yebhethri.

Isihlukanisiyebhethri ye-lithium-ion iyingxenye ebalulekile yokuqinisekisa ukusebenza kwebhethri nokuphepha.Umsebenzi oyinhloko we-separator ukuhlukanisa ama-electrode amahle futhi angalungile, futhi ngesikhathi esifanayo, angakwazi futhi ukwakha isiteshi sokunyakaza kwe-ion futhi agcine i-electrolyte edingekayo.Ukusebenza kanye nemingcele ehlobene yesihlukanisi sebhethri ye-lithium-ion yethulwa kanje:

1. Ukuzinza kwamakhemikhali: I-diaphragm kufanele ibe nokuzinza okuhle kakhulu kwamakhemikhali, ukumelana nokugqwala okuhle nokumelana nokuguga ngaphansi kwezimo ze-organic solvent, futhi ingagcina ukusebenza okuzinzile ngaphansi kwezimo ezinzima ezifana nokushisa okuphezulu nomswakama ophezulu.

2. Amandla omshini: Isihlukanisi kufanele sibe namandla anele okusebenza kanye nokunwebeka ukuze kuqinisekiswe amandla okuqina okwanele nokumelana nokugqoka ukuvimbela ukulimala ngesikhathi sokuhlanganisa noma ukusetshenziswa.

3. I-Ionic conductivity: Ngaphansi kwesistimu ye-electrolyte ephilayo, i-ionic conductivity iphansi kunaleyo yesistimu ye-electrolyte yamanzi, ngakho-ke isihlukanisi kufanele sibe nezici zokumelana okuphansi kanye ne-ionic conductivity ephezulu.Ngesikhathi esifanayo, ukuze kuncishiswe ukumelana, ubukhulu besihlukanisi kufanele bube buncane ngangokunokwenzeka ukuze indawo ye-electrode ibe nkulu ngangokunokwenzeka.

4. Ukuzinza kwe-thermal: Uma izinto ezingavamile noma ukwehluleka njengokushajwa ngokweqile, ukukhishwa ngokweqile, nokujikeleza okufushane kwenzeka ngesikhathi sokusebenza kwebhethri, isihlukanisi kufanele sibe nokuzinza okuhle kwe-thermal.Ezingeni elithile lokushisa, i-diaphragm kufanele ithambe noma inyibilike, ngaleyo ndlela ivimbele ukujikeleza kwangaphakathi kwebhethri futhi ivimbele izingozi zokuphepha kwebhethri.

5. Ukumanzisa okwanele kanye nesakhiwo sembotshana esilawulekayo: Isakhiwo sembotshana kanye nokunameka kwangaphezulu kwesihlukanisi kufanele kube nokulawuleka okwanele kokumanzisa ukuze kuqinisekiswe isihlukanisi, ngaleyo ndlela kuthuthukiswe amandla kanye nempilo yomjikelezo webhethri.Ngokuvamile, i-polyethylene flake (PP) kanye ne-polyethylene flake (PE) ama-microporous diaphragms ayizinto ezivamile ze-diaphragm okwamanje, futhi intengo ishibhile.Kodwa kunezinye izinto zokuhlukanisa ibhethri ye-lithium-ion, njenge-polyester, ezinokusebenza okuhle, kodwa intengo iphakeme kakhulu.