I-CMC isebenzisa kuShishino lwebhetri

Yintoni i-sodium carboxymethyl cellulose?

I-Sodium Carboxymethyl cellulose, (ekwabizwa ngokuba: ityuwa ye-Carboxymethyl cellulose sodium, i-Carboxymethyl cellulose, i-CMC, i-Carboxymethyl, i-CelluloseSodium, i-SodiumsaltofCaboxyMethylCellulose) yeyona nto isetyenziswa kakhulu kwiintlobo zefayibha zehlabathi, i-dosage ephezulu.

I-Cmc-na i-derivative cellulose kunye ne-polymerization degree ye-100 ~ 2000 kunye ne-molecular weight 242.16. Ifibrous emhlophe okanye ipowder granular. Ayinavumba, incasa, incasa, ihygroscopic, ayinyibiliki kwizinyibilikisi zendalo. Eli phepha ngokukodwa ukuqonda ukusetyenziswa kwe-sodium carboxymethyl cellulose kwiinkcukacha zebhetri ye-lithium ion.

Inkqubela phambili ekusebenziseni i-Sodium carboxymethyl cellulose CMCkwiibhetri ze-lithium ion

Okwangoku, i-polyvinylidene fluoride [pVDF, (CH: A CF:)] isetyenziswa ngokubanzi njenge-binder ekuveliseni iibhetri ze-lithium ion. . I-PVDF ayibizi nje kuphela, kufuneka isetyenziswe kwinkqubo yokusetyenziswa kwezinto eziqhumayo, ezinobuhlobo kwimo engqongileyo ye-solvents eziphilayo, ezifana ne-N methyl apho i-alkane ketone (NMp) kunye neemfuno zokufuma komoya kwinkqubo yokuvelisa ngokungqongqo, kwakhona ngokulula kunye ne-embedded. i-lithium yesinyithi, i-lithium graphite reaction yesibini, ngakumbi kwimeko yobushushu obuphezulu, umngcipheko ozenzekelayo wokubaleka kwe-thermal. I-sodium carboxymethyl cellulose (CMC), i-binder yamanzi e-soluble, isetyenziselwa indawo ye-pVDF yezinto ze-electrode, ezinokuphepha ukusetyenziswa kwe-NMp, ukunciphisa iindleko kunye nokunciphisa ukungcoliseka kwendalo. Kwangaxeshanye, inkqubo yemveliso ayifuni ukufuma kokusingqongileyo, kodwa inokuphucula umthamo webhetri, yandise ubomi bomjikelo. Kulo phepha, indima ye-CMC ekusebenzeni kwebhetri ye-lithium ion yahlaziywa, kwaye indlela ye-CMC yokuphucula ukusebenza kwebhetri yashwankathelwa kwiinkalo zokuzinza kwe-thermal, ukuhanjiswa kombane kunye neempawu ze-electrochemical.

1. Ubume kunye nokusebenza kweCMC

1) Ubume beCMC

I-CMC ihlelwa ngokubanzi ngokwenqanaba elahlukileyo lokuthatha indawo (Ds), kwaye imo yemveliso kunye nokusebenza kuchatshazelwa kakhulu nguDs. LXie et al. wafunda i-CMC kunye nee-D zeepere ezahlukeneyo ze-H ze-Na. Iziphumo zohlalutyo lwe-SEM zibonise ukuba i-CMC-Li-1 (Ds = 1.00) ibonise isakhiwo se-granular, kunye ne-CMC-Li-2 (Ds = 0.62) ibonise isakhiwo somgca. Uphando lwe-M. Et al lubonakalise ukuba i-CMC. I-rubber ye-Styrene butadiene (i-SBR) inokuthintela i-agglomeration ye-Li: O kunye nokuzinzisa i-interface structure, enenzuzo ekusebenzeni kwe-electrochemical.

2) Ukusebenza kweCMC

2.1 )Ukuzinza kwe-Thermal

UZj Han et al. wafunda uzinzo thermal izibophelelo ezahlukeneyo. Ubushushu obubalulekileyo be-pVDF bumalunga nama-4500C. Xa ufikelela kwi-500℃, ukubola ngokukhawuleza kwenzeka kwaye ubunzima buncitshiswe malunga ne-70%. Xa iqondo lobushushu lifikelela kuma-600℃, ubunzima baphinda bancitshiswa ngama-70%. Xa ubushushu bufikelela kwi-300oC, ubunzima beCMC-Li buncitshiswe ngama-70%. Xa ubushushu bufikelela kwi-400 ℃, ubunzima beCMC-Li bancitshiswa nge-10%. I-CMLi yonakala ngokulula ngakumbi kune-pVDF ekupheleni kobomi bebhetri.

2.2 )I-conductivity yombane

S. Chou et al. Iziphumo zovavanyo zibonise ukuba ukuxhathisa kwe-CMCLI-1, i-CMC-Li-2 kunye ne-pVDF yayiyi-0.3154 Mn·m kunye ne-0.2634 Mn, ngokulandelelana. I-M kunye ne-20.0365 Mn · m, ebonisa ukuba i-resistiveivity ye-pVDF iphezulu kune-CMCLi, i-conductivity ye-CMC-LI ingcono kune-pVDF, kwaye i-CMCLI.1 iphantsi kune-CMCLI.2.

2.3)Ukusebenza kwe-electrochemical

FM Courtel et al. wafunda i-cyclic voltammetry curves ye-poly-sulfonate (AQ) esekelwe kwi-electrodes xa kusetyenziswa imibhobho eyahlukeneyo. Izibophelelo ezahlukeneyo zinee-oxidation ezahlukeneyo kunye neempendulo zokunciphisa, ngoko ke amandla encopho ahlukile. Phakathi kwabo, amandla e-oxidation ye-CMLi yi-2.15V, kwaye amandla okunciphisa yi-2.55V. Amandla e-oxidation kunye namandla okunciphisa i-pVDF yayiyi-2.605 V kunye ne-1.950 V ngokulandelanayo. Xa kuthelekiswa ne-cyclic voltammetry curves yamaxesha amabini adlulileyo, incopho yokwahlukana kwencopho yokunciphisa i-oxidation xa i-CMCLi binder isetyenzisiweyo yayincinci kunaleyo xa i-pVDF isetyenzisiweyo, ebonisa ukuba ukusabela kwakungathintelwanga kwaye i-CMCLi binder yayifaneleka ngakumbi ukwenzeka kokusabela kokunciphisa i-oxidation.

2. Isiphumo sokusetyenziswa kunye nendlela ye-CMC

1) Isiphumo sokusetyenziswa

Pj Suo et al. wafunda ukusebenza kwe-electrochemical ye-Si / C izinto ezihlanganisiweyo xa i-pVDF kunye ne-CMC zisetyenziswa njengezibophelelo, kwaye zafumanisa ukuba ibhetri esebenzisa i-CMC inomthamo othile obuyiselwa umva we-700mAh / g okokuqala kwaye isenayo i-597mAh / g emva kwemijikelo ye-4O, ethe kratya. yayiphezulu kunebhetri esebenzisa i-pVDF. UJh Lee et al. wafunda impembelelo ye-Ds ye-CMC kuzinzo lokumiswa kwegraphite kwaye bakholelwa ukuba umgangatho wolwelo wokunqunyanyiswa umiselwe nguDs. Kwi-DS ephantsi, i-CMC ineempawu ezinamandla ze-hydrophobic, kwaye inokunyusa ukusabela kunye nomphezulu wegraphite xa amanzi esetyenziswa njengemidiya. I-CMC nayo ineenzuzo ekugcineni uzinzo kwiipropati ze-cyclic ze-silicon - izinto ze-tin alloy anode. I-electrodes ye-NiO yalungiswa ngemilinganiselo eyahlukeneyo (0.1mouL, 0.3mol / L kunye ne-0.5mol / L) i-CMC kunye ne-pVDF binder, kwaye ihlawuliswe kwaye ikhutshwe kwi-1.5-3.5V kunye ne-current ye-0.1c. Ngexesha lomjikelo wokuqala, umthamo weseli yokubopha i-pVDF wawuphezulu kunolo lweseli yokubopha i-CMC. Xa inani lemijikelo lifikelela kwi-lO, amandla okukhutshwa kwe-pVDF ayancipha ngokucacileyo. Emva kwemijikelo ye-4JD, amandla athile okukhutshwa kwe-0.1movL, 0.3MOUL kunye ne-0.5MovLPVDF izibophelelo zehle ukuya kwi-250mAh / g, 157mAtv 'g kunye ne-102mAh / g, ngokulandelanayo: Ukukhupha amandla athile ebhetri nge-moL3 / L / 1. kunye ne0.5 I-moL / LCMC i-binder igcinwe kwi-698mAh / g, 555mAh / g kunye ne-550mAh / g, ngokulandelanayo.

Isibophelelo se-CMC sisetyenziswa kwi-LiTI0. : kunye ne-SnO2 nanoparticles kwimveliso yezoshishino. Ukusebenzisa i-CMC njenge-binder, i-LiFepO4 kunye ne-Li4TI50l2 njengezinto ezisebenzayo nezingalunganga, ngokulandelelana, kunye nokusetyenziswa kwe-pYR14FS1 njenge-electrolyte e-flame retardant, ibhetri yayijikelezwe ngamaxesha angama-150 ngoku ngu-0.1c kwi-1.5v ~ 3.5V kwiqondo lokushisa, kunye ne-positive ethile echanekileyo. I-capacitance igcinwe kwi-140mAh / g. Phakathi kweetyuwa zetsimbi ezahlukeneyo kwi-CMC, i-CMLi yazisa ezinye ii-ion zetsimbi, ezinokunqanda "i-exchange reaction (vii)" kwi-electrolyte ngexesha lokujikeleza.

2) Indlela yokuphucula ukusebenza

I-CMC Li binder inokuphucula ukusebenza kwe-electrochemical ye-AQ base electrode kwibhetri ye-lithium. M. Et al. -I-4 iqhube isifundo sokuqala kwindlela kwaye iphakamise imodeli yokusasazwa kwe-CMC-Li kwi-electrode ye-AQ. Ukusebenza kakuhle kwe-CMCli kuvela kwimpembelelo eqinile yokubambisana kweebhondi ze-hydrogen eziveliswa yi-OH, enegalelo ekubunjweni ngokufanelekileyo kwezakhiwo ze-mesh. I-hydrophilic CMC-Li ayiyi kuchithwa kwi-electrolyte ephilayo, ngoko inozinzo oluhle kwibhetri, kwaye ibambelele ngokuqinileyo kwisakhiwo se-electrode, eyenza ibhetri ibe nokuzinza okulungileyo. I-Cmc-li binder ine-Li conductivity elungileyo kuba kukho inani elikhulu lamaqela asebenzayo kwitsheyini ye-molecular ye-CMC-Li. Ngexesha lokukhutshwa, kukho imithombo emibini yezinto ezisebenzayo ezisebenza kunye noLi: (1) Li kwi-electrolyte; (2) Li kwitsheyini yemolekyuli yeCMC-Li kufutshane neziko elisebenzayo lezinto ezisebenzayo.

Ukusabela kweqela le-hydroxyl kunye neqela le-hydroxyl kwi-carboxymethyl CMC-Li binder iya kwenza i-covalent bond; Ngaphantsi kwesenzo samandla ombane ombane, i-U inokudlulisa kwi-molecular chain okanye i-molecular chain chain, oko kukuthi, i-molecular chain structure ayiyi konakaliswa; Ekugqibeleni, i-Lj iya kudibanisa kwi-particle ye-AQ. Oku kubonisa ukuba ukusetyenziswa kwe-CMLi akuphuculi kuphela ukuhanjiswa kwe-Li, kodwa kuphucula izinga lokusetyenziswa kwe-AQ. Ukuphakama komxholo we-ch: COOLi kunye ne-10Li kwikhonkco le-molecular, kulula ukudluliselwa kwe-Li. M. Arrmand et al. wayekholelwa ukuba i-organic compounds -COOH okanye i-OH inokusabela kunye ne-1 Li ngokulandelanayo kwaye ivelise i-1 C00Li okanye i-1 0Li kwikhono eliphantsi. Ukuze uqhubele phambili uphonononga indlela ye-CMCLi binder kwi-electrode, i-CMC-Li-1 isetyenziswe njengezinto ezisebenzayo kunye nezigqibo ezifanayo zafunyanwa. U-Li uphendula nge-cH enye, i-COOH kunye ne-0H enye esuka kwi-CMC Li kwaye ivelise i-cH: COOLi kunye no-0 "ngokulandelelanayo, njengoko kubonisiwe kwii-equations (1) kunye (2)

Njengoko inani le-ch, i-COOLi, kunye ne-OLi linyuka, i-DS ye-CMC-Li iyanda. Oku kubonisa ukuba umaleko ophilayo oqulunqwe ikakhulu yi-AQ particle surface binder uba uzinzile kwaye kulula ukudlulisela uLi. I-CMLi yipolymer eqhubayo ebonelela ngendlela yothutho yeLi ukufikelela kumphezulu wamasuntswana e-AQ. Izibophelelo ze-CMLi zine-conductivity efanelekileyo ye-elektroniki kunye ne-ionic, ekhokelela ekusebenzeni kakuhle kwe-electrochemical kunye nobomi bomjikelo omde wee-electrode ze-CMCli. JS Bridel et al. ilungise i-anode yebhetri ye-lithium ion isebenzisa i-silicon/carbon/polymer composite materials with different binders ukufunda ifuthe lentsebenziswano phakathi kwesilicon kunye ne-polymer ekusebenzeni ngokubanzi kwebhetri, kwaye yafumanisa ukuba i-CMC yayinokusebenza kakuhle xa isetyenziswa njenge-binder. Kukho ibhondi eyomeleleyo ye-hydrogen phakathi kwe-silicon kunye ne-CMC, enekhono lokuziphilisa kwaye inokulungelelanisa ukunyanzeliswa kwengcinezelo yezinto eziphathekayo ngexesha lenkqubo yokuhamba ngebhayisikili ukuze kugcinwe ukuzinza kwesakhiwo sezinto eziphathekayo. Nge-CMC njenge-binder, umthamo we-silicon anode unokugcinwa ngaphezulu kwe-1000mAh / g ubuncinane kwimijikelezo ye-100, kwaye ukusebenza kakuhle kwe-coulomb kusondele kwi-99.9%.

3, isiphelo

Njenge-binder, izinto ze-CMC zingasetyenziswa kwiindidi ezahlukeneyo zemathiriyeli ye-electrode efana negraphite yendalo, i-meso-phase carbon microspheres (MCMB), i-lithium titanate, i-tin esekwe kwi-silicon esekelwe kwizinto ze-anode kunye ne-lithium iron phosphate anode material, enokuphucula ibhetri. umthamo, uzinzo lomjikelo kunye nobomi bomjikelezo xa kuthelekiswa ne-pYDF. Kuyinzuzo ukuzinza kwe-thermal, ukuhanjiswa kombane kunye neempawu ze-electrochemical ze-CMC. Kukho iindlela ezimbini eziphambili zeCMC zokuphucula ukusebenza kweebhetri ze-lithium ion:

(1) Ukusebenza kwebhondi ezinzileyo ye-CMC kudala imfuneko eyimfuneko yokufumana ukusebenza kwebhetri okuzinzileyo;

(2) I-CMC ine-electron elungileyo kunye ne-ion conductivity kwaye inokukhuthaza ukudluliselwa kwe-Li