CMC imagwiritsa ntchito mumakampani a Battery

Kodi sodium carboxymethyl cellulose ndi chiyani?

Sodium Carboxymethyl cellulose, (wotchedwanso: Carboxymethyl cellulose sodium salt, Carboxymethyl cellulose, CMC, Carboxymethyl, CelluloseSodium, SodiumsaltofCaboxyMethylCellulose) ndi mitundu yomwe imagwiritsidwa ntchito kwambiri padziko lonse lapansi ya fiber, mlingo wokwanira.

Cmc-na ndi chochokera ku cellulose chokhala ndi digiri ya polymerization ya 100 ~ 2000 ndi molekyulu yolemera 242.16. White fibrous kapena granular ufa. Zosanunkhiza, zosakoma, zosakoma, hygroscopic, zosasungunuka mu zosungunulira za organic. Pepalali makamaka kuti mumvetsetse kugwiritsa ntchito sodium carboxymethyl cellulose muzambiri za batri la lithiamu ion.

Kupita patsogolo pakugwiritsa ntchito Sodium carboxymethyl cellulose CMCm'mabatire a lithiamu-ion

Pakali pano, polyvinylidene fluoride [pVDF, (CH: A CF:)] amagwiritsidwa ntchito kwambiri ngati binder popanga mabatire a lithiamu ion. . PVDF si okwera mtengo, komanso ayenera kugwiritsa ntchito m'kati ntchito zophulika, wochezeka ndi chilengedwe cha zosungunulira organic, monga N methyl amene alkane ketone (NMp) ndi zofunika mpweya chinyezi kwa ndondomeko kupanga mosamalitsa, komanso mosavuta ndi ophatikizidwa. Lifiyamu zitsulo, lithiamu graphite yachiwiri anachita, makamaka mu chikhalidwe cha kutentha, chiwopsezo mowiriza wa kuthawa matenthedwe. Sodium carboxymethyl cellulose (CMC), chophatikizira chosungunuka m'madzi, chimagwiritsidwa ntchito ngati cholowa m'malo mwa pVDF pazinthu za elekitirodi, zomwe zingapewe kugwiritsa ntchito NMp, kuchepetsa ndalama komanso kuchepetsa kuwononga chilengedwe. Pa nthawi yomweyo, kupanga ndondomeko sikutanthauza chinyezi chilengedwe, komanso akhoza kusintha mphamvu ya batire, kutalikitsa mkombero moyo. Mu pepalali, ntchito ya CMC pakuchita batire ya lithiamu ion idawunikiridwa, ndipo makina a CMC owongolera magwiridwe antchito adafotokozedwa mwachidule kuchokera ku kukhazikika kwamafuta, kuwongolera kwamagetsi ndi mawonekedwe a electrochemical.

1. Kapangidwe ndi kachitidwe ka CMC

1) Mapangidwe a CMC

CMC nthawi zambiri imayikidwa m'malo osiyanasiyana (Ds), ndipo mawonekedwe azinthu ndi magwiridwe antchito amakhudzidwa kwambiri ndi Ds. LXie et al. adaphunzira THE CMC ndi ma D amagulu osiyanasiyana a H a Na. Zotsatira za kusanthula kwa SEM zikuwonetsa kuti CMC-Li-1 (Ds = 1.00) idapereka mawonekedwe ang'onoang'ono, ndipo CMC-Li-2 (Ds = 0.62) idapereka mawonekedwe amzere. Kafukufuku wa M. E et al adatsimikizira kuti CMC. Styrene butadiene rabara (SBR) akhoza ziletsa agglomeration wa Li: O ndi kukhazikika mawonekedwe mawonekedwe, amene ali opindulitsa kwa electrochemical ntchito.

2) Kuchita bwino kwa CMC

2.1)Kukhazikika kwamafuta

Zj Han et al. anaphunzira kukhazikika kwa kutentha kwa zomangira zosiyanasiyana. Kutentha kwakukulu kwa pVDF ndi pafupifupi 4500C. Ikafika ku 500 ℃, kuwola mwachangu kumachitika ndipo misa imachepetsedwa ndi 70%. Kutentha kukafika 600 ℃, misa idachepetsedwanso ndi 70%. Kutentha kukafika 300oC, kuchuluka kwa CMC-Li kudachepetsedwa ndi 70%. Kutentha kukafika 400 ℃, kuchuluka kwa CMC-Li kudachepetsedwa ndi 10%. CMCLi imawonongeka mosavuta kuposa pVDF kumapeto kwa moyo wa batri.

2.2)The magetsi madutsidwe

S. Chou et al. Zotsatira za mayeso adawonetsa kuti resistivity ya CMCLI-1, CMC-Li-2 ndi pVDF inali 0.3154 Mn·m ndi 0.2634 Mn, motsatana. M ndi 20.0365 Mn·m, kusonyeza kuti resistivity pVDF ndi apamwamba kuposa CMCLi, conductivity ya CMC-LI bwino kuposa pVDF, ndi conductivity wa CMCLI.1 ndi otsika kuposa CMCLI.2.

2.3)Electrochemical performance

FM Courtel et al. anaphunzira ma cyclic voltammetry curves of poly-sulfonate (AQ) based electrodes pamene ma binderswere osiyana amagwiritsidwa ntchito. Zomangira zosiyanasiyana zimakhala ndi makutidwe ndi okosijeni osiyanasiyana komanso kuchepetsedwa, kotero kuthekera kwapamwamba kumakhala kosiyana. Pakati pawo, mphamvu ya okosijeni ya CMCLi ndi 2.15V, ndipo mphamvu yochepetsera ndi 2.55V. Kuthekera kwa okosijeni ndi kuchepetsa kuthekera kwa pVDF kunali 2.605 V ndi 1.950 V motsatana. Poyerekeza ndi ma cyclic voltammetry ma curve a nthawi ziwiri zam'mbuyomu, kusiyana kwakukulu komwe kungatheke pakuchepetsa kuchepa kwa okosijeni pomwe CMCLi binder idagwiritsidwa ntchito inali yaying'ono kuposa yomwe pVDF idagwiritsidwa ntchito, zomwe zikuwonetsa kuti zomwe zidalepheretsedwa ndipo CMCLi binder inali yabwino kupezeka kwa ma oxidation-reduction reaction.

2. Kugwiritsa ntchito ndi njira ya CMC

1) Ntchito zotsatira

Pj Suo et al. adaphunzira momwe ma elekitiromu amagwirira ntchito pazinthu zophatikizika za Si / C pomwe pVDF ndi CMC zidagwiritsidwa ntchito ngati zomangira, ndipo adapeza kuti batire yomwe imagwiritsa ntchito CMC inali ndi mphamvu yosinthika ya 700mAh / g kwa nthawi yoyamba ndipo inali ndi 597mAh / g pambuyo pa 4O kuzungulira, komwe inali yabwino kuposa batri yogwiritsa ntchito pVDF. Jh Lee et al. anaphunzira chikoka cha Ds wa CMC pa bata la kuyimitsidwa graphite ndipo ankakhulupirira kuti madzi khalidwe kuyimitsidwa anatsimikiza ndi Ds. Pa otsika DS, CMC ali wamphamvu hydrophobic katundu, ndipo akhoza kuonjezera anachita ndi graphite pamwamba pamene madzi ntchito ngati TV. CMC alinso ndi ubwino kukhala bata cyclic katundu pakachitsulo - malata aloyi anode zipangizo. Ma elekitirodi a NiO adakonzedwa mosiyanasiyana (0.1mouL, 0.3mol / L ndi 0.5mol / L) CMC ndi pVDF binder, ndipo amaperekedwa ndi kutulutsidwa pa 1.5-3.5V ndi 0.1c panopa. Pakuzungulira koyamba, mphamvu ya cell binder ya pVDF inali yayikulu kuposa ya CMC binder cell. Kuchuluka kwa mikombero kukafika pa lO, kutulutsa kwa pVDF binder kumachepa mwachiwonekere. Pambuyo pa kuzungulira kwa 4JD, mphamvu zotulutsa za 0.1movL, 0.3MOUL ndi 0.5MovLPVDF zidatsikira mpaka 250mAh/g, 157mAtv 'g ndi 102mAh/g, motsatana: Kutulutsa mphamvu zapadera zamabatire okhala ndi 3 moL/L/0. ndi 0,5 moL/LCMC binder anali kusungidwa pa 698mAh/g, 555mAh/g ndi 550mAh/g motsatana.

CMC binder imagwiritsidwa ntchito pa LiTI0. : ndi SnO2 nanoparticles pakupanga mafakitale. Pogwiritsa ntchito CMC monga binder, LiFepO4 ndi Li4TI50l2 monga zipangizo zabwino ndi zoipa yogwira, motero, ndi kugwiritsa ntchito pYR14FS1 monga lawi retardant electrolyte, batire anali njinga nthawi 150 pa panopa 0.1c pa 1.5v ~ 3.5V pa kutentha, ndi zabwino yeniyeni yeniyeni. luso linasungidwa pa 140mAh/g. Pakati pa mchere wambiri wachitsulo ku CMC, CMCLi imayambitsa ma ion zitsulo ena, omwe amatha kuletsa "kusinthana (vii)" mu electrolyte panthawi yozungulira.

2) Njira yowongolera magwiridwe antchito

CMC Li binder imatha kukonza magwiridwe antchito a electrochemical a AQ base electrode mu batri ya lithiamu. M. E ndi al. -4 adachita kafukufuku woyambirira pamakina ndipo adapereka chitsanzo cha kugawa kwa CMC-Li mu electrode ya AQ. Kuchita bwino kwa CMCLi kumachokera kumphamvu yolumikizana ndi ma hydrogen bond opangidwa ndi OH, omwe amathandizira kupanga bwino kwa ma mesh. Hydrophilic CMC-Li sichidzasungunuka mu electrolyte ya organic, kotero imakhala ndi kukhazikika kwabwino mu batri, ndipo imakhala yomatira mwamphamvu pamapangidwe a electrode, zomwe zimapangitsa kuti batire ikhale yokhazikika bwino. Cmc-li binder ili ndi ma conductivity abwino a Li chifukwa pali magulu ambiri ogwira ntchito pamamolekyu a CMC-Li. Pakutulutsa, pali magwero awiri a zinthu zogwira mtima zomwe zimagwira ntchito ndi Li: (1) Li mu electrolyte; (2) Li pa unyolo wa maselo a CMC-Li pafupi ndi likulu lothandiza la chinthu chogwira ntchito.

Zomwe gulu la hydroxyl ndi gulu la hydroxyl mu carboxymethyl CMC-Li binder lipanga covalent chomangira; Pansi pa mphamvu yamagetsi yamagetsi, U ukhoza kusamutsa pa unyolo wa maselo kapena unyolo wapafupi wa maselo, ndiko kuti, dongosolo la unyolo la maselo silidzawonongeka; Pamapeto pake, Lj idzalumikizana ndi tinthu ta AQ. Izi zikuwonetsa kuti kugwiritsa ntchito CMCLi sikungowonjezera kusamutsa kwa Li, komanso kumapangitsanso kuchuluka kwa magwiritsidwe a AQ. Kukwera kwa cH: COOLi ndi 10Li mu unyolo wa mamolekyulu, ndikosavuta kusamutsa kwa Li. M. Arrmand et al. amakhulupirira kuti organic mankhwala -COOH kapena OH akhoza kuchitapo kanthu ndi 1 Li motsatira ndi kupanga 1 C00Li kapena 1 0Li pa mphamvu zochepa. Kuti mupitirize kufufuza njira ya CMCLi binder mu electrode, CMC-Li-1 idagwiritsidwa ntchito ngati zinthu zogwira ntchito ndipo mfundo zofanana zinapezedwa. Li imakhudzidwa ndi cH imodzi, COOH ndi 0H imodzi kuchokera ku CMC Li ndikupanga cH: COOLi ndi imodzi 0 "motsatira, monga momwe ziwonetsedwera mu equation (1) ndi (2)

Pamene chiwerengero cha ch, COOLi, ndi OLi chikuwonjezeka, DS ya CMC-Li imawonjezeka. Izi zikuwonetsa kuti organic wosanjikiza wopangidwa makamaka ndi AQ tinthu pamwamba binder amakhala okhazikika komanso osavuta kusamutsa Li. CMCLi ndi polima yoyendetsa yomwe imapereka njira yoyendera kuti Li ifike pamwamba pa tinthu tating'ono ta AQ. Zomangira za CMCLi zili ndi madulidwe abwino amagetsi ndi ayoni, zomwe zimapangitsa kuti pakhale ntchito yabwino yamagetsi komanso moyo wautali wamagetsi a CMCLi. JS Bridel et al. anakonza anode wa lifiyamu ion batire ntchito pakachitsulo / mpweya / polima zipangizo gulu ndi zomangira zosiyanasiyana kuphunzira chikoka cha mogwirizana pakati pa pakachitsulo ndi polima pa ntchito yonse ya batire, ndipo anapeza kuti CMC anali ntchito yabwino pamene ntchito monga binder. Pali chomangira champhamvu cha haidrojeni pakati pa silicon ndi CMC, chomwe chili ndi mphamvu yodzichiritsa yokha ndipo imatha kusintha kupsinjika kwazinthu zomwe zikuchulukirachulukira panthawi yoyendetsa njinga kuti zisunge bata. Ndi CMC ngati binder, mphamvu ya silicon anode imatha kusungidwa pamwamba pa 1000mAh/g m'mizere yosachepera 100, ndipo mphamvu ya coulomb ili pafupi ndi 99.9%.

3, mapeto

Monga binder, CMC zakuthupi angagwiritsidwe ntchito mitundu yosiyanasiyana ya elekitirodi zipangizo monga graphite zachilengedwe, meso-gawo mpweya microspheres (MCMB), lifiyamu titanate, malata zochokera pakachitsulo zochokera anode zakuthupi ndi lifiyamu chitsulo mankwala anode zakuthupi, amene akhoza kusintha batire. mphamvu, kukhazikika kwa kuzungulira ndi moyo wozungulira poyerekeza ndi pYDF. Ndizopindulitsa pakukhazikika kwamafuta, kukhazikika kwamagetsi ndi ma electrochemical azinthu za CMC. Pali njira ziwiri zazikulu zopangira CMC kuti ipititse patsogolo magwiridwe antchito a mabatire a lithiamu ion:

(1) Kukhazikika kokhazikika kwa CMC kumapanga chofunikira chofunikira kuti batire igwire bwino;

(2) CMC ili ndi ma elekitironi abwino ndi ma ion conductivity ndipo imatha kulimbikitsa kusamutsa kwa Li