CMC e sebelisa indastering ea betri

Sodium carboxymethyl cellulose ke eng?

Sodium Carboxymethyl cellulose, (eo hape e bitsoang: Carboxymethyl cellulose sodium letsoai, Carboxymethyl cellulose, CMC, Carboxymethyl, CelluloseSodium, SodiumsaltofCaboxyMethylCellulose) ke mefuta e sebelisoang ka ho fetisisa lefatšeng ea fiber, tekanyo ea tekanyo e phahameng.

Cmc-na ke derivative ea cellulose e nang le tekanyo ea polymerization ea 100 ~ 2000 le boima ba molek'hule ea 242.16.Phofo e tšoeu ea fibrous kapa granular.Ha e na monko, ha e latsoehe, ha e latsoehe, ha e na hygroscopic, ha e qhibilihe ka har'a metsoako ea manyolo.Pampiri ena haholo-holo ho utloisisa ts'ebeliso ea sodium carboxymethyl cellulose ho lintlha tsa betri tsa lithium ion.

Khatelo-pele ea tšebeliso ea sodium carboxymethyl cellulose CMCka libeteri tsa lithium ion

Hajoale, polyvinylidene fluoride [pVDF, (CH: A CF:)] e sebelisoa haholo e le setlamo ho hlahisoeng ha libeteri tsa lithium ion..PVDF ha e theko e boima feela, e boetse e hloka ho sebelisa ts'ebetsong ea ts'ebetso ea ho phatloha, e nang le botsoalle ho tikoloho ea li-solvents tsa organic, joalo ka N methyl eo alkane ketone (NMp) le litlhoko tsa mongobo oa moea bakeng sa ts'ebetso ea tlhahiso ka tieo, hape habonolo ka embedded. tšepe lithium, lithium graphite secondary reaction, haholo-holo boemong ba mocheso o phahameng, kotsi e itlelang feela ea ho baleha mocheso.Sodium carboxymethyl cellulose (CMC), e kopanyang metsi, e sebelisoa e le sebaka sa pVDF bakeng sa lisebelisoa tsa electrode, tse ka qobang tšebeliso ea NMp, ho fokotsa litšenyehelo le ho fokotsa tšilafalo ea tikoloho.Ka nako e ts'oanang, ts'ebetso ea tlhahiso ha e hloke mongobo oa tikoloho, empa hape e ka ntlafatsa bokhoni ba betri, e lelefatsa bophelo ba potoloho.Lengolong lena, karolo ea CMC ts'ebetsong ea betri ea lithium ion e ile ea hlahlojoa, 'me mochine oa CMC o ntlafatsang ts'ebetso ea betri o ile oa akaretsoa ho tloha likarolong tsa botsitso ba mocheso, motlakase oa motlakase le litšobotsi tsa electrochemical.

1. Sebopeho le tšebetso ea CMC

1) Sebopeho sa CMC

CMC ka kakaretso e hlophisoa ka maemo a fapaneng a phapanyetso (Ds), mme sebopeho sa sehlahisoa le ts'ebetso li angoa haholo ke Ds.LXie et al.o ithutile CMC le Ds tsa lipara tse fapaneng tsa H tsa Na.Liphetho tsa tlhahlobo ea SEM li bonts'itse hore CMC-Li-1 (Ds = 1.00) e hlahisitse sebopeho sa granular, mme CMC-Li-2 (Ds = 0.62) e hlahisitse sebopeho sa mola.Lipatlisiso tsa M. E et al li pakile hore CMC.Styrene butadiene rabara (SBR) ka thibela agglomeration ea Li: O le ho tsitsisa sebopeho segokanyimmediamentsi sa sebolokigolo, e leng molemo ho tshebetso electrochemical.

2) Ts'ebetso ea CMC

2.1 )Ho tsitsa ha mocheso

Zj Han et al.o ithutile ka botsitso ba mocheso oa li-binders tse fapaneng.Thempereichara ea bohlokoa ea pVDF e ka ba 4500C.Ha e fihla ho 500 ℃, ho bola ka potlako ho etsahala mme boima bo fokotsehile ka hoo e ka bang 70%.Ha mocheso o fihla ho 600 ℃, boima bo ile ba fokotseha hape ka 70%.Ha mocheso o fihla ho 300oC, boima ba CMC-Li bo fokotsehile ka 70%.Ha mocheso o fihla ho 400 ℃, boima ba CMC-Li bo fokotsehile ka 10%.CMCLi e senyeha habonolo ho feta pVDF qetellong ea bophelo ba betri.

2.2 )The conductivity ea motlakase

S. Chou et al.' liphetho tsa liteko li bontšitse hore resistivity ea CMCLI-1, CMC-Li-2 le pVDF e ne e le 0.3154 Mn·m le 0.2634 Mn, ka ho latellana.M le 20.0365 Mn·m, e bontšang hore resistivity ea pVDF e phahametse ea CMCLi, conductivity ea CMC-LI e molemo ho feta ea pVDF, le conductivity ea CMCLI.1 e tlaase ho feta ea CMCLI.2.

2.3)Ts'ebetso ea electrochemical

FM Courtel et al.e ithutile li-cyclic voltammetry curves tsa li-electrode tse thehiloeng ho poly-sulfonate (AQ) ha ho sebelisoa li-bindersware tse fapaneng.Li-binders tse fapaneng li na le karabelo e fapaneng ea oxidation le phokotso, ka hona, monyetla oa tlhoro o fapane.Har'a tsona, matla a oxidation a CMCLi ke 2.15V, 'me monyetla oa ho fokotsa ke 2.55V.Matla a oxidation le phokotso ea pVDF e ne e le 2.605 V le 1.950 V ka ho latellana.Ha ho bapisoa le li-curve tsa cyclic voltammetry tsa makhetlo a mabeli a fetileng, phapang ea tlhoro e ka bang teng ea tlhoro ea phokotso ea oxidation ha CMCLi binder e ne e sebelisoa e ne e le nyane ho feta ha pVDF e ne e sebelisoa, e bonts'a hore karabelo e ne e sa sitisoe hanyane mme setlamo sa CMCLi se ne se loketse ho feta. ketsahalo ya ketso ya phokotso ya oxidation.

2. Phello ea kopo le mokhoa oa CMC

1) Phello ea kopo

Pj Suo et al.e ithutile ts'ebetso ea electrochemical ea lisebelisoa tse kopaneng tsa Si / C ha pVDF le CMC li sebelisoa e le likhokahano, mme ba fumana hore betri e sebelisang CMC e na le bokhoni bo ikhethileng ba 700mAh / g ka lekhetlo la pele mme e ntse e na le 597mAh / g kamora 4O cycles, eo e ne e phahametse betri e sebelisang pVDF.Jh Lee et al.o ile a ithuta tšusumetso ea Ds ea CMC ka botsitso ba ho emisoa ha graphite mme a lumela hore boleng ba mokelikeli oa ho emisoa bo ne bo khethoa ke Ds.Ka DS e tlase, CMC e na le thepa e matla ea hydrophobic, 'me e ka eketsa karabelo ka bokaholimo ba graphite ha metsi a sebelisoa joalo ka media.CMC e boetse e na le melemo ea ho boloka botsitso ba thepa ea cyclic ea silicon - lisebelisoa tsa tin alloy anode.Li-electrode tsa NiO li ne li lokiselitsoe ka likhahla tse fapaneng (0.1mouL, 0.3mol / L le 0.5mol / L) CMC le pVDF binder, 'me li qosoa le ho lokolloa ho 1.5-3.5V ka hona joale ea 0.1c.Nakong ea potoloho ea pele, matla a sele e kopanyang ea pVDF e ne e le holimo ho feta sele e kopanyang ea CMC.Ha palo ea li-cycle e fihla ho lO, ho hlakile hore matla a ho ntša pVDF a fokotseha.Ka mor'a 4JD cycles, matla a ho ntša a 0.1movL, 0.3MOUL le 0.5MovLPVDF a theohetse ho 250mAh/g, 157mAtv 'g le 102mAh/g, ka ho latellana: Ho ntša matla a khethehileng a libeteri tse nang le 0,L/1. le 0.5 moL/LCMC binder li ne li bolokiloe ho 698mAh/g, 555mAh/g le 550mAh/g, ka ho latellana.

Setlamo sa CMC se sebelisoa ho LiTI0.: le SnO2 nanoparticles tlhahiso ea indasteri.E sebelisa CMC e le binder, LiFepO4 le Li4TI50l2 e le lisebelisoa tse sebetsang tse ntle le tse mpe, ka ho latellana, le ho sebelisa pYR14FS1 e le electrolyte e thibelang lelakabe, betri e ile ea tsamaisoa ka makhetlo a 150 ka nako ea 0.1c ho 1.5v ~ 3.5V mocheso, le tse nepahetseng tse tobileng tse nepahetseng. bokhoni bo ne bo bolokiloe ho 140mAh / g.Har'a matsoai a fapaneng a tšepe a CMC, CMCLi e hlahisa li-ion tse ling tsa tšepe, tse ka thibelang "exchange reaction (vii)" ho electrolyte nakong ea potoloho.

2) Mokhoa oa ho ntlafatsa ts'ebetso

CMC Li binder e ka ntlafatsa ts'ebetso ea electrochemical ea AQ base electrode ka har'a betri ea lithium.M. E et al.-4 e ile ea etsa lipatlisiso tsa pele holim'a mochine 'me ea etsa tlhahiso ea mohlala oa ho ajoa ha CMC-Li ho electrode ea AQ.Ts'ebetso e ntle ea CMCLi e tsoa ho phello e matla ea tlamahano ea li-hydrogen bond tse hlahisoang ke OH, e tlatsetsang ho thehoeng ka katleho ha mesh mesh.Hydrophilic CMC-Li e ke ke ea qhibiliha ka har'a electrolyte ea tlhaho, kahoo e na le botsitso bo botle ka har'a betri, 'me e na le ho khomarela ka matla mohahong oa electrode, e leng se etsang hore betri e be le botsitso bo botle.Cmc-li binder e na le conductivity e ntle ea Li hobane ho na le lihlopha tse ngata tse sebetsang ka har'a ketane ea limolek'hule ea CMC-Li.Nakong ea ho tsoa, ​​ho na le mehloli e 'meli ea lintho tse sebetsang tse sebetsang le Li: (1) Li ka electrolyte;(2) Li ka ketane ea molek'hule ea CMC-Li haufi le setsi se sebetsang sa ntho e sebetsang.

Boitšoaro ba sehlopha sa hydroxyl le sehlopha sa hydroxyl ho carboxymethyl CMC-Li binder e tla theha bond ea covalent;Tlas'a ketso ea matla a motlakase, U ka fetisetsa ketane ea limolek'hule kapa ketane e haufi ea molek'hule, ke hore, mohaho oa ketane ea limolek'hule o ke ke oa senyeha;Qetellong, Lj e tla ikopanya le karoloana ea AQ.Sena se bontša hore ts'ebeliso ea CMCLi ha e ntlafatse feela katleho ea phetisetso ea Li, empa hape e ntlafatsa tekanyo ea tšebeliso ea AQ.Ha litaba tsa cH li phahame: COOLi le 10Li ka har'a ketane ea limolek'hule, ho bonolo ho fetisa Li.M. Arrmand le ba bang.o ne a lumela hore metsoako ea manyolo ea -COOH kapa OH e ka itšoara ka 1 Li ka ho latellana 'me ea hlahisa 1 C00Li kapa 1 0Li ka matla a tlaase.E le ho hlahloba ka ho eketsehileng mochine oa CMCLi binder ka electrode, CMC-Li-1 e sebelisitsoe e le thepa e sebetsang 'me ho ile ha fumanoa liqeto tse tšoanang.Li e sebetsana le cH e le 'ngoe, COOH le 0H e le 'ngoe ho tsoa ho CMC Li' me e hlahisa cH: COOLi le e le 'ngoe 0 ka ho latellana, joalokaha ho bontšoa ho li-equations (1) le (2)

Ha palo ea CH, COOLi, le OLi e ntse e eketseha, DS ea CMC-Li ea eketseha.Sena se bontša hore lera la manyolo le entsoeng haholo-holo ka AQ particle surface binder le fetoha le tsitsitseng le ho le bonolo ho fetisetsa Li.CMCLi ke polymer e tsamaisang e fanang ka tsela ea lipalangoang bakeng sa Li ho fihla bokaholimo ba likaroloana tsa AQ.Li-binder tsa CMCLi li na le conductivity e ntle ea elektronike le ea ionic, e hlahisang ts'ebetso e ntle ea electrochemical le bophelo bo bolelele ba potoloho ea li-electrode tsa CMCLi.JS Bridel et al.e lokisitse anode ea betri ea lithium ion e sebelisa lisebelisoa tse kopantsoeng tsa silicon/carbon/polymer tse nang le li-binder tse fapaneng ho ithuta tšusumetso ea tšebelisano lipakeng tsa silicon le polymer ts'ebetsong e akaretsang ea betri, mme a fumana hore CMC e na le ts'ebetso e ntle ka ho fetisisa ha e sebelisoa e le setlamo.Ho na le maqhama a matla a hydrogen pakeng tsa silicon le CMC, e nang le bokhoni ba ho ipholisa 'me e ka fetola khatello e ntseng e eketseha ea thepa nakong ea ts'ebetso ea libaesekele ho boloka botsitso ba sebopeho sa thepa.Ka CMC e le binder, matla a silicon anode a ka bolokoa ka holimo ho 1000mAh/g bonyane lipotolohong tse 100, 'me katleho ea coulomb e haufi le 99.9%.

3, sephetho

E le binder, thepa ea CMC e ka sebelisoa ka mefuta e fapaneng ea lisebelisoa tsa elektrode tse kang graphite ea tlhaho, meso-phase carbon microspheres (MCMB), lithium titanate, tin based silicon based anode material le lithium iron phosphate anode material, e ka ntlafatsang betri. bokhoni, botsitso ba potoloho le bophelo ba potoloho ha bo bapisoa le pYDF.E na le molemo ho botsitso ba mocheso, conductivity ea motlakase le thepa ea electrochemical ea thepa ea CMC.Ho na le mekhoa e 'meli ea mantlha ea CMC ho ntlafatsa ts'ebetso ea libeteri tsa lithium ion:

(1) Ts'ebetso e tsitsitseng ea bonding ea CMC e theha tlhokahalo e hlokahalang bakeng sa ho fumana ts'ebetso e tsitsitseng ea betri;

(2) CMC e na le elektronike e ntle le conductivity ea ion 'me e ka khothalletsa Li phetiso