I-CMC isebenzisa Emkhakheni Webhethri

Iyini i-sodium carboxymethyl cellulose?

I-Sodium Carboxymethyl cellulose, (ebizwa nangokuthi: i-Carboxymethyl cellulose sodium salt, Carboxymethyl cellulose, CMC, Carboxymethyl, CelluloseSodium, SodiumsaltofCaboxyMethylCellulose) yizinhlobo zefayibha ezisetshenziswa kakhulu emhlabeni, isilinganiso esiphezulu.

I-Cmc-na iwumphumela we-cellulose onedigri ye-polymerization engu-100~2000 kanye nesisindo samangqamuzana angu-242.16. Impushana emhlophe noma i-granular. Ayinaphunga, ayinambitheki, ayinambitheki, ayinambitheki, ayincibiliki kumakhemikhali aphilayo. Leli phepha ikakhulukazi ukuqonda ukusetshenziswa kwe-sodium carboxymethyl cellulose kumininingwane yebhethri ye-lithium ion.

Inqubekelaphambili ekusetshenzisweni kwe-Sodium carboxymethyl cellulose I-CMCkumabhethri e-lithium ion

Njengamanje, i-polyvinylidene fluoride [pVDF, (CH: A CF:)] isetshenziswa kabanzi njenge-binder ekukhiqizeni amabhethri e-lithium ion. . I-PVDF ayibizi nje kuphela, futhi idinga ukusetshenziselwa inqubo yokufaka iziqhumane, ezinobungane endaweni yezincibilikisi eziphilayo, njenge-N methyl lapho i-alkane ketone (NMp) kanye nezidingo zomswakama womoya zenqubo yokukhiqiza ngokuqinile, futhi kalula nge-embedded. i-lithium yensimbi, ukusabela kwesibili kwe-lithium graphite, ikakhulukazi esimweni sokushisa okuphezulu, ingozi ezenzakalelayo yokubaleka okushisayo. I-sodium carboxymethyl cellulose (CMC), isibopho esincibilika emanzini, sisetshenziswa esikhundleni se-pVDF sezinto ezisetshenziswa yi-electrode, engagwema ukusetshenziswa kwe-NMp, ukunciphisa izindleko nokunciphisa ukungcoliswa kwemvelo. Ngesikhathi esifanayo, inqubo yokukhiqiza ayidingi umswakama wemvelo, kodwa futhi ingathuthukisa umthamo webhethri, inwebe impilo yomjikelezo. Kuleli phepha, indima ye-CMC ekusebenzeni kwebhethri ye-lithium ion yabuyekezwa, futhi indlela ye-CMC yokuthuthukisa ukusebenza kwebhethri yafingqwa kusuka ezicini zokuzinza kwe-thermal, conductivity kagesi kanye nezici ze-electrochemical.

1. Isakhiwo nokusebenza kwe-CMC

1) Isakhiwo se-CMC

I-CMC imvamisa ihlukaniswa ngokwezinga elihlukile lokushintshwa (ama-D), futhi i-morphology yomkhiqizo kanye nokusebenza kuthintwa kakhulu u-Ds. LXie et al. ufunde i-CMC nama-D amapheya e-H ahlukene e-Na. Imiphumela yokuhlaziywa kwe-SEM ibonise ukuthi i-CMC-Li-1 (Ds = 1.00) yethule ukwakheka kwe-granular, futhi i-CMC-Li-2 (Ds = 0.62) yethule ukwakheka komugqa. Ucwaningo lwe-M. E et al lufakazele ukuthi i-CMC. Irabha ye-Styrene butadiene (SBR) ingavimbela i-agglomeration ye-Li: O futhi izinze ukwakheka kwesixhumi esibonakalayo, okuyinzuzo ekusebenzeni kwe-electrochemical.

2) Ukusebenza kwe-CMC

2.1)Ukuzinza okushisayo

UZj Han et al. wafunda ukuzinza okushisayo kwezibopheli ezihlukene. Izinga lokushisa elibucayi le-pVDF lilinganiselwa ku-4500C. Lapho ifinyelela ku-500 ℃, ukubola ngokushesha kwenzeka futhi isisindo sincishiswa cishe ngama-70%. Lapho izinga lokushisa lifinyelela ku-600 ℃, isisindo saphinde sehliswa ngo-70%. Lapho izinga lokushisa lifinyelela ku-300oC, isisindo se-CMC-Li sancipha ngo-70%. Lapho izinga lokushisa lifinyelela ku-400 ℃, isisindo se-CMC-Li sancipha ngo-10%. I-CMLi ibola kalula kune-pVDF ekupheleni kwempilo yebhethri.

2.2)I-conductivity kagesi

S. Chou et al. Imiphumela yokuhlolwa ibonise ukuthi ukumelana kwe-CMCLI-1, CMC-Li-2 kanye ne-pVDF kube ngu-0.3154 Mn·m kanye no-0.2634 Mn, ngokulandelana. I-M kanye ne-20.0365 Mn·m, okubonisa ukuthi ukumelana kwe-pVDF kuphakeme kunaleyo ye-CMCLi, ukuqhutshwa kwe-CMC-LI kungcono kune-pVDF, futhi ukuqhuba kwe-CMCLI.1 kungaphansi kwalokho kwe-CMCLI.2.

2.3)Ukusebenza kwe-Electrochemical

Ukhozi FM et al. ifunde amajika e-voltammetry angama-cyclic we-poly-sulfonate (AQ) ama-electrode asekelwe lapho kusetshenziswa ama-binderswered ahlukene. Izibophezelo ezihlukene zinokusabela okuhlukile kwe-oxidation nokunciphisa, ngakho amandla aphezulu ahlukile. Phakathi kwazo, amandla e-oxidation we-CMLi yi-2.15V, futhi amandla okunciphisa angu-2.55V. Amandla e-oxidation namandla okunciphisa e-pVDF ayengu-2.605 V kanye no-1.950 V ngokulandelanayo. Uma kuqhathaniswa namajika e-voltammetry angama-cyclic ezikhathi ezimbili ezedlule, umehluko omkhulu ongaba khona wenani eliphakeme lokuncishiswa kwe-oxidation lapho kusetshenziswa i-CMCLi binder yayincane kunaleyo ngenkathi kusetshenziswa i-pVDF, okubonisa ukuthi ukusabela kwakuvinjelwa kancane futhi i-CMLi binder yayifaneleka kakhulu ukwenzeka kokusabela kokunciphisa i-oxidation.

2. Umphumela wohlelo lokusebenza kanye nendlela ye-CMC

1) Umphumela wohlelo lokusebenza

Pj Suo et al. itadishe ukusebenza kwe-electrochemical kwezinto eziyinhlanganisela ye-Si/C lapho i-pVDF ne-CMC kusetshenziswa njengezibophezelo, yathola ukuthi ibhethri elisebenzisa i-CMC lalinamandla athile abuyisele emuva emuva angu-700mAh/g okokuqala futhi liseno-597mAh/g ngemva kwemijikelezo engu-4O, okuyinto ibingcono kunebhethri esebenzisa i-pVDF. Jh Lee et al. ifunde umthelela wama-D e-CMC ekuzinzeni kokumiswa kwe-graphite futhi yakholelwa ukuthi ikhwalithi yoketshezi yokumiswa inqunywe ngu-Ds. Nge-DS ephansi, i-CMC inezici ezinamandla ze-hydrophobic, futhi ingakhuphula ukusabela nge-graphite surface lapho amanzi esetshenziswa njengemidiya. I-CMC futhi inezinzuzo ekugcineni ukuqina kwezakhiwo ze-cyclic ze-silicon - tin alloy anode materials. Ama-electrode e-NiO alungiselelwe ngokugxila okuhlukile (0.1mouL, 0.3mol/L kanye ne-0.5mol/L) i-CMC ne-pVDF binder, futhi ashajwa futhi akhishwe ku-1.5-3.5V nge-current ye-0.1c. Phakathi nomjikelezo wokuqala, amandla eseli yokuhlanganisa i-pVDF ayengaphezulu kwalawo eseli yokuhlanganisa ye-CMC. Lapho inani lemijikelezo lifinyelela ku-lO, amandla okukhipha isibopho se-pVDF ayehla ngokusobala. Ngemuva kwemijikelezo ye-4JD, amandla athile okukhipha angu-0.1movL, 0.3MOUL kanye ne-0.5MovLPVDF ehle aze afike ku-250mAh/g, 157mAtv 'g no-102mAh/g, ngokulandelanayo: Amandla akhethekile okukhipha amabhethri ano-0,L/0. kanye 0.5 I-moL/LCMC binder igcinwe ku-698mAh/g, 555mAh/g kanye no-550mAh/g, ngokulandelana.

Isibophezelo se-CMC sisetshenziswa ku-LiTI0. : kanye ne-SnO2 nanoparticles ekukhiqizeni kwezimboni. Isebenzisa i-CMC njengesibophezelo, i-LiFepO4 kanye ne-Li4TI50l2 njengezinto ezisebenzayo nezingezinhle, ngokulandelana, futhi kusetshenziswa i-pYR14FS1 njenge-electrolyte evimbela ilangabi, ibhethri lajikeleziswa izikhathi ezingu-150 ngesivinini esingu-0.1c ku-1.5v ~ 3.5V ezingeni lokushisa, kanye ne-positive ethize ethize amandla agcinwe ku-140mAh/g. Phakathi kukasawoti wensimbi ohlukahlukene ku-CMC, i-CMLi yethula amanye ama-ion ensimbi, angavimbela “ukusabela kokushintshisana (vii)” ku-electrolyte ngesikhathi sokujikeleza.

2) Indlela yokuthuthukisa ukusebenza

I-CMC Li binder ingathuthukisa ukusebenza kwe-electrochemical kwe-AQ base electrode kubhethri le-lithium. M. E et al. -4 yenze ucwaningo lokuqala kumshini futhi yaphakamisa imodeli yokusatshalaliswa kwe-CMC-Li ku-electrode ye-AQ. Ukusebenza kahle kwe-CMCli kuvela kumphumela oqinile wokubopha amabhondi e-hydrogen akhiqizwa i-OH, enomthelela ekwakhekeni okuphumelelayo kwezakhiwo ezinezikhala. I-hydrophilic CMC-Li ngeke incibilike ku-electrolyte ephilayo, ngakho-ke inokuqina okuhle ebhethrini, futhi inokunamathela okuqinile esakhiweni se-electrode, okwenza ibhethri libe nokuzinza okuhle. I-Cmc-li binder ine-Li conductivity enhle ngoba kunenombolo enkulu yamaqembu asebenzayo ochungechungeni lwamangqamuzana e-CMC-Li. Ngesikhathi sokukhishwa, kunemithombo emibili yezinto ezisebenzayo ezisebenza no-Li: (1) Li ku-electrolyte; (2) U-Li ochungechungeni lwamangqamuzana e-CMC-Li eduze nendawo esebenzayo yento esebenzayo.

Ukusabela kweqembu le-hydroxyl neqembu le-hydroxyl ku-carboxymethyl CMC-Li binder kuzokwakha isibopho esivumelanayo; Ngaphansi kwesenzo samandla kagesi, i-U ingadlulisela kuchungechunge lwamangqamuzana noma iketanga eliseduze le-molecular, okungukuthi, isakhiwo seketango lamangqamuzana ngeke sonakaliswe; Ekugcineni, i-Lj izobambisana nezinhlayiyana ze-AQ. Lokhu kubonisa ukuthi ukusetshenziswa kwe-CMLi akuthuthukisi ukusebenza kahle kokudluliselwa kwe-Li kuphela, kodwa futhi kuthuthukisa izinga lokusebenzisa i-AQ. Ukuphakama kokuqukethwe kwe-cH: COOLi kanye no-10Li ochungechungeni lwemolekyuli, kulula ukudluliswa kwe-Li. M. Arrmand et al. wayekholelwa ukuthi izinhlanganisela eziphilayo ze-COOH noma i-OH zingasabela nge-1 Li ngokulandelanayo futhi zikhiqize i-1 C00Li noma i-1 0Li ngamandla aphansi. Ukuze kuqhutshekwe nokuhlola indlela yokuhlanganisa i-CMCli ku-electrode, i-CMC-Li-1 isetshenziswe njengento esebenzayo futhi kwatholakala iziphetho ezifanayo. U-Li usabela nge-cH eyodwa, i-COOH kanye no-0H eyodwa evela ku-CMC Li futhi akhiqize u-cH: COOLi noyedwa ongu-0 “ngokulandelana, njengoba kuboniswe ezilinganisweni (1) kanye (2)

Njengoba inani le-ch, i-COOLi, ne-OLi likhula, i-DS ye-CMC-Li iyanda. Lokhu kubonisa ukuthi ungqimba oluphilayo olwakhiwe ikakhulukazi i-AQ particle surface binder luzinza futhi kube lula ukudlulisa u-Li. I-CMLi iyi-polymer eqhubayo ehlinzeka ngomzila wezokuthutha ukuze u-Li afinyelele phezulu kwezinhlayiya ze-AQ. Izibophezelo ze-CMLi zinokusebenza okuhle kwe-elekthronikhi ne-ionic, okuholela ekusebenzeni okuhle kwe-electrochemical nempilo yomjikelezo omude wama-electrode e-CMCli. JS Bridel et al. ilungise i-anode yebhethri ye-lithium ion isebenzisa izinto eziyinhlanganisela ye-silicon/carbon/polymer enezibophezelo ezihlukene ukuze kufundwe umthelela wokusebenzelana phakathi kwe-silicon ne-polymer ekusebenzeni kukonke kwebhethri, futhi bathola ukuthi i-CMC yayinokusebenza okungcono kakhulu lapho isetshenziswa njengesibophezelo. Kukhona isibopho esiqinile se-hydrogen phakathi kwe-silicon ne-CMC, enekhono lokuziphilisa futhi engalungisa ukucindezelwa okwandayo kwezinto ngesikhathi senqubo yokugibela ibhayisikili ukuze kugcinwe ukuzinza kwesakhiwo sezinto ezibonakalayo. Nge-CMC njenge-binder, umthamo we-silicon anode ungagcinwa ungaphezulu kuka-1000mAh/g okungenani imijikelezo eyi-100, futhi ukusebenza kahle kwe-coulomb kusondele ku-99.9%.

3, isiphetho

Njenge-binder, impahla ye-CMC ingasetshenziswa ezinhlotsheni ezahlukene zezinto ze-electrode ezifana ne-graphite yemvelo, i-meso-phase carbon microspheres (MCMB), i-lithium titanate, i-tin based silicon based anode material kanye ne-lithium iron phosphate anode material, engathuthukisa ibhethri. umthamo, ukuzinza komjikelezo kanye nempilo yomjikelezo uma kuqhathaniswa ne-pYDF. Kuzuzisa ukuzinza okushisayo, ukuqhutshwa kukagesi kanye nezakhiwo ze-electrochemical zezinto ze-CMC. Kunezindlela ezimbili eziyinhloko ze-CMC zokuthuthukisa ukusebenza kwamabhethri e-lithium ion:

(1) Ukusebenza kwebhondi okuzinzile kwe-CMC kudala imfuneko edingekayo ukuze kutholwe ukusebenza kwebhethri okuzinzile;

(2) I-CMC ine-electron enhle ne-ion conductivity futhi ingakhuthaza ukudluliswa kwe-Li