Ana amfani da CMC a Masana'antar Baturi

Menene sodium carboxymethyl cellulose?

Sodium Carboxymethyl cellulose, (wanda kuma ake kira: Carboxymethyl cellulose sodium gishiri, Carboxymethyl cellulose, CMC, Carboxymethyl, CelluloseSodium, SodiumsaltofCaboxyMethylCellulose) shi ne duniya da aka fi amfani da fiber nau'in fiber, sashi mafi girma.

Cmc-na shine abin da aka samo asali na cellulose tare da digiri na polymerization na 100 ~ 2000 da nauyin kwayoyin halitta na 242.16. Farin fibrous ko granular foda. Marasa wari, mara daɗi, mara daɗi, hygroscopic, maras narkewa a cikin kaushi na halitta. Wannan takarda yafi fahimtar aikace-aikacen sodium carboxymethyl cellulose a cikin cikakkun bayanan baturi na lithium ion.

Ci gaba a aikace-aikacen sodium carboxymethyl cellulose CMCa cikin batirin lithium ion

A halin yanzu, polyvinylidene fluoride [pVDF, (CH: A CF:)] ana amfani da shi sosai azaman ɗaure wajen samar da batirin lithium ion. . PVDF ba kawai tsada ba ne, kuma yana buƙatar amfani da shi a cikin aiwatar da abubuwan fashewa, abokantaka ga yanayin yanayin kaushi, kamar N methyl wanda alkane ketone (NMp) da buƙatun zafi na iska don aiwatar da samarwa sosai, kuma cikin sauƙi tare da sakawa. karfe lithium, lithium graphite na biyu dauki, musamman a yanayin zafi mai zafi, wani m hadarin da thermal gudu. Sodium carboxymethyl cellulose (CMC), mai haɗa ruwa mai narkewa, ana amfani dashi azaman madadin pVDF don kayan lantarki, wanda zai iya guje wa amfani da NMp, rage farashi da rage gurɓataccen muhalli. A lokaci guda, tsarin samarwa baya buƙatar zafi na muhalli, amma kuma zai iya inganta ƙarfin baturi, tsawaita rayuwar sake zagayowar. A cikin wannan takarda, an sake nazarin rawar da CMC ke takawa a cikin aikin batirin lithium ion, kuma an taƙaita tsarin CMC na inganta aikin baturi daga abubuwan da suka shafi kwanciyar hankali na zafi, ƙarfin lantarki da halayen lantarki.

1. Tsarin da aikin CMC

1) Tsarin CMC

CMC gabaɗaya ana rarraba ta ta nau'in maye gurbin daban-daban (Ds), kuma samfuran samfuran halitta da aiki suna da tasiri sosai daga Ds. LXie et al. yayi karatun CMC tare da Ds na H nau'i-nau'i daban-daban na Na. Sakamakon bincike na SEM ya nuna cewa CMC-Li-1 (Ds = 1.00) ya gabatar da tsarin granular, kuma CMC-Li-2 (Ds = 0.62) ya gabatar da tsarin layi. Binciken M. E et al ya tabbatar da cewa CMC. Styren butadiene roba (SBR) na iya hana agglomeration na Li: O da daidaita tsarin dubawa, wanda ke da amfani ga aikin lantarki na lantarki.

2) CMC aiki

2.1)Zaman lafiyar thermal

Zj Han et al. yayi nazarin yanayin kwanciyar hankali na thermal daban-daban. Matsakaicin zafin jiki na pVDF shine kusan 4500C. Lokacin kai 500 ℃, saurin bazuwar yana faruwa kuma ana rage yawan ta kusan 70%. Lokacin da zafin jiki ya kai 600 ℃, an ƙara rage yawan da 70%. Lokacin da zafin jiki ya kai 300oC, an rage yawan CMC-Li da 70%. Lokacin da zafin jiki ya kai 400 ℃, an rage yawan CMC-Li da 10%. CMLi ya fi sauƙi bazuwa fiye da pVDF a ƙarshen rayuwar baturi.

2.2)Wutar lantarki

S. Chou et al. Sakamakon gwajin ya nuna cewa tsayayyar CMCLI-1, CMC-Li-2 da pVDF sun kasance 0.3154 Mn·m da 0.2634 Mn, bi da bi. M da 20.0365 Mn·m, yana nuna cewa tsayayyar pVDF ya fi na CMcli, ƙaddamarwar CMC-LI ya fi na pVDF, kuma ƙaddamarwar CMCLI.1 ya kasance ƙasa da na CMCLI.2.

2.3)Ayyukan Electrochemical

FM Courtel et al. yayi nazarin magudanar ruwa na cyclic voltammetry na tushen lantarki na poly-sulfonate (AQ) lokacin da aka yi amfani da ɗaure daban-daban. Daban-daban masu ɗaure suna da nau'ikan oxidation daban-daban da halayen ragewa, don haka babban yuwuwar ya bambanta. Daga cikin su, yuwuwar iskar oxygenation na CMCL shine 2.15V, kuma yuwuwar raguwa shine 2.55V. Matsakaicin yuwuwar iskar oxygen da rage yuwuwar pVDF sun kasance 2.605 V da 1.950 V bi da bi. Idan aka kwatanta da cyclic voltammetry masu lankwasa na lokutan biyun da suka gabata, mafi girman yuwuwar bambance-bambancen yuwuwar ƙoƙon rage iskar shaka lokacin da aka yi amfani da ɗaurin CMLi ya yi ƙasa da wancan lokacin da aka yi amfani da pVDF, yana nuna cewa abin ya kasance ƙasa da cikas kuma mai ɗaure CMLi ya fi dacewa. abin da ya faru na oxidation-reduction reaction.

2. Sakamakon aikace-aikacen da tsarin CMC

1) Tasirin aikace-aikace

Pj Suo et al. yayi nazarin aikin sinadarai na sinadarai na Si / C lokacin da aka yi amfani da pVDF da CMC a matsayin masu ɗaure, kuma sun gano cewa baturin da ke amfani da CMC yana da ƙarfin iya canzawa na 700mAh / g a karon farko kuma har yanzu yana da 597mAh / g bayan hawan 4O, wanda ya fi baturi ta amfani da pVDF. Jh Lee et al. yayi nazarin tasirin Ds na CMC akan kwanciyar hankali na dakatarwar graphite kuma ya yi imanin cewa ingancin dakatarwar an ƙaddara ta Ds. A low DS, CMC yana da karfi hydrophobic Properties, kuma zai iya ƙara da dauki tare da graphite surface lokacin da ruwa da ake amfani da matsayin kafofin watsa labarai. CMC kuma yana da fa'idodi a cikin kiyaye kwanciyar hankali na cyclic Properties na silicon - tin alloy anode kayan. An shirya na'urorin lantarki na NiO tare da nau'i daban-daban (0.1mouL, 0.3mol / L da 0.5mol / L) CMC da pVDF mai ɗaure, kuma an caje da fitarwa a 1.5-3.5V tare da halin yanzu na 0.1c. A lokacin sake zagayowar farko, ƙarfin pVDF mai ɗaure tantanin halitta ya fi na tantanin ɗauri na CMC. Lokacin da adadin hawan keke ya kai lO, ƙarfin fitarwa na mai ɗaure pVDF yana raguwa a fili. Bayan zagayowar 4JD, takamaiman ikon fitarwa na 0.1movL, 0.3MOUL da 0.5MovLPVDF masu ɗaure sun ragu zuwa 250mAh/g, 157mAtv 'g da 102mAh/g, bi da bi: Fitar takamaiman ƙarfin batura tare da 0.1 moL/L/0.0. kuma 0.5 moL/LCMC daure an kiyaye 698mAh/g, 555mAh/g da 550mAh/g, bi da bi.

Ana amfani da ɗaure CMC akan LiTI0. : da SnO2 nanoparticles a cikin samar da masana'antu. Yin amfani da CMC a matsayin mai ɗaure, LiFepO4 da Li4TI50l2 azaman kayan aiki masu inganci da mara kyau, bi da bi, da kuma amfani da pYR14FS1 azaman wutar lantarki mai ɗaukar wuta, batirin ya zagaya sau 150 a halin yanzu na 0.1c a 1.5v ~ 3.5V a zazzabi, da takamaiman takamaiman tabbataccen An kiyaye karfin a 140mAh/g. Daga cikin nau'ikan gishirin ƙarfe daban-daban a cikin CMC, CMCLi yana gabatar da wasu ions na ƙarfe, waɗanda zasu iya hana "haɓakar musanya (vii)" a cikin electrolyte yayin wurare dabam dabam.

2) Hanyar inganta aiki

CMC Li mai ɗaure na iya haɓaka aikin lantarki na AQ tushen lantarki a cikin baturi na lithium. M. E da al. -4 ya gudanar da bincike na farko akan tsarin kuma ya ba da shawarar samfurin rarraba CMC-Li a cikin AQ electrode. Kyakkyawan aikin CMCLi ya fito ne daga tasirin haɗin gwiwar hydrogen da OH ke samarwa, wanda ke ba da gudummawa ga ingantaccen tsarin raga. CMC-Li hydrophilic ba zai narke a cikin kwayoyin halitta ba, don haka yana da kwanciyar hankali mai kyau a cikin baturi, kuma yana da karfi mai karfi ga tsarin lantarki, wanda ya sa baturi ya sami kwanciyar hankali. Cmc-li mai ɗaure yana da kyawawa mai kyau na Li saboda akwai ɗimbin ƙungiyoyi masu aiki akan sarkar kwayoyin halitta na CMC-Li. A lokacin fitarwa, akwai hanyoyi guda biyu na ingantattun abubuwa masu aiki tare da Li: (1) Li a cikin electrolyte; (2) Li akan sarkar kwayoyin halitta na CMC-Li kusa da ingantaccen cibiyar abu mai aiki.

Halin ƙungiyar hydroxyl da ƙungiyar hydroxyl a cikin ɗauren carboxymethyl CMC-Li zai samar da haɗin gwiwa; Ƙarƙashin aikin ƙarfin wutar lantarki, U na iya canjawa a kan sarkar kwayoyin halitta ko sarkar kwayoyin da ke kusa, wato, tsarin sarkar kwayoyin halitta ba zai lalace ba; A ƙarshe, Lj zai haɗi zuwa ga barbashi na AQ. Wannan yana nuna cewa aikace-aikacen CMLi ba kawai yana haɓaka ingancin canja wurin Li ba, har ma yana haɓaka ƙimar amfani da AQ. Mafi girman abun ciki na chH: COOLi da 10Li a cikin sarkar kwayoyin halitta, sauƙin canja wurin Li. M. Arrmand et al. sunyi imani cewa mahadi na -COOH ko OH zasu iya amsawa tare da 1 Li kuma suna samar da 1 C00Li ko 1 0Li a ƙananan yuwuwar. Don ci gaba da bincika tsarin CMLi mai ɗaure a cikin lantarki, CMC-Li-1 an yi amfani da shi azaman kayan aiki kuma an sami sakamako iri ɗaya. Li yana amsawa da cH ɗaya, COOH da 0H ɗaya daga CMC Li kuma yana haifar da chH: COOli da 0 ɗaya "bi da bi, kamar yadda aka nuna a cikin daidaito (1) da (2)

Yayin da adadin chH, COOli, da OLi ke ƙaruwa, DS na CMC-Li yana ƙaruwa. Wannan ya nuna cewa da kwayoyin Layer hada yafi AQ barbashi surface daure zama mafi barga da kuma sauki don canja wurin Li. CMLi polymer ne mai ɗaukar nauyi wanda ke ba da hanyar sufuri don Li don isa saman ɓangarorin AQ. CMCLi masu ɗaure suna da ingantaccen lantarki da haɓakar ionic, wanda ke haifar da kyakkyawan aikin lantarki na lantarki da tsawon rayuwar zagayowar lantarki na CMLi. JS Bridel et al. shirya anode na lithium ion baturi ta amfani da silicon / carbon / polymer composite kayan tare da daban-daban masu ɗaure don nazarin tasirin hulɗar tsakanin silicon da polymer a kan gaba ɗaya aikin baturi, kuma ya gano cewa CMC yana da mafi kyawun aiki lokacin da aka yi amfani da shi azaman ɗaure. Akwai ƙaƙƙarfan haɗin hydrogen tsakanin silicon da CMC, wanda ke da ikon warkarwa da kansa kuma zai iya daidaita yawan damuwa na kayan aiki a lokacin hawan keke don kula da kwanciyar hankali na tsarin kayan. Tare da CMC a matsayin mai ɗaure, ana iya kiyaye ƙarfin silicon anode sama da 1000mAh/g a cikin aƙalla zagayowar 100, kuma ingancin coulomb yana kusa da 99.9%.

3, gamawa

A matsayin mai ɗaure, ana iya amfani da kayan CMC a cikin nau'ikan kayan lantarki daban-daban kamar graphite na halitta, meso-lokaci carbon microspheres (MCMB), lithium titanate, tin tushen silicon tushen anode abu da lithium baƙin ƙarfe phosphate anode abu, wanda zai iya inganta baturi. iya aiki, kwanciyar hankali da sake zagayowar rayuwa idan aka kwatanta da pYDF. Yana da amfani ga kwanciyar hankali na thermal, ƙarfin lantarki da kaddarorin lantarki na kayan CMC. Akwai manyan hanyoyi guda biyu don CMC don inganta aikin batirin lithium ion:

(1) Tsayayyen aikin haɗin gwiwa na CMC yana haifar da buƙatun da ake buƙata don samun ingantaccen aikin baturi;

(2) CMC yana da kyau electron da ion conductivity kuma zai iya inganta Li canja wurin