CMC na-eji na ụlọ ọrụ batrị

Gịnị bụ sodium carboxymethyl cellulose?

Sodium Carboxymethyl cellulose, (a na-akpọkwa: Carboxymethyl cellulose sodium nnu, Carboxymethyl cellulose, CMC, Carboxymethyl, CelluloseSodium, SodiumsaltofCaboxyMethylCellulose) bụ ụwa kasị n'ọtụtụ ebe ụdị nke eriri, onunu ogwu nke kacha.

Cmc-na bụ ihe nrụpụta cellulose nwere ogo polymerization nke 100 ~ 2000 yana ịdị arọ molekụla nke 242.16. Ọcha fibrous ma ọ bụ ntụ ntụ granular. Enweghị isi, enweghị ụtọ, enweghị ụtọ, hygroscopic, enweghị ike ime na ihe mgbaze organic. Akwụkwọ a tumadi ịghọta ngwa nke sodium carboxymethyl cellulose na lithium ion nkọwa batrị.

Ọganihu na ntinye nke sodium carboxymethyl cellulose CMCna batrị lithium ion

Ka ọ dị ugbu a, a na-eji polyvinylidene fluoride [pVDF, (CH: A CF:)] dị ka ihe eji emepụta batrị lithium ion. . PVDF abụghị naanị ọnụ, ọ dịkwa mkpa iji na usoro nke ngwa mgbawa, enyi na enyi na gburugburu ebe obibi nke organic solvents, dị ka N methyl nke alkane ketone (NMp) na ikuku iru mmiri chọrọ maka mmepụta usoro nlezianya, na-adị mfe na agbakwunyere. metal lithium, lithium graphite mmeghachi omume nke abụọ, karịsịa na ọnọdụ okpomọkụ dị elu, ihe ize ndụ na-enweghị isi nke ikpo ọkụ ọkụ. A na-eji sodium carboxymethyl cellulose (CMC), ihe nkedo na-edozi mmiri, dị ka ihe ngbanwe nke pVDF maka ihe electrode, nke nwere ike izere iji NMp mee ihe, belata ụgwọ ma belata mmetọ gburugburu ebe obibi. N'otu oge ahụ, usoro mmepụta anaghị achọ iru mmiri gburugburu ebe obibi, ma ọ pụkwara imeziwanye ikike nke batrị ahụ, mee ka ndụ okirikiri dịkwuo ogologo. N'akwụkwọ a, a tụlere ọrụ CMC na arụmọrụ nke batrị lithium ion, na usoro nke CMC na-eme ka arụmọrụ batrị dịkwuo elu ka a chịkọtara site na akụkụ nke nkwụsi ike nke okpomọkụ, nkwụsi ike eletrik na njirimara electrochemical.

1. Ọdịdị na arụmọrụ nke CMC

1) Ọdịdị CMC

A na-ekewa CMC n'ozuzu site na ogo nnọchi anya dị iche iche (Ds), na morphology ngwaahịa na arụmọrụ na-emetụta nke ukwuu Ds. LXie et al. mụọ THE CMC na Ds nke dị iche iche H pairs nke Na. Nsonaazụ nyocha nke SEM gosiri na CMC-Li-1 (Ds = 1.00) gosipụtara usoro granular, yana CMC-Li-2 (Ds = 0.62) gosipụtara usoro ahịrị. Nnyocha nke M. E et al gosipụtara na CMC. Styren butadiene roba (SBR) nwere ike igbochi agglomeration nke Li: O na kwụsie ike na interface Ọdịdị, nke bara uru na electrochemical arụmọrụ.

2) CMC arụmọrụ

2.1)Nkwụsi ike okpomọkụ

Zj Han et al. mụọ nkwụsi ike thermal nke dị iche iche binders. Okpomọkụ dị oke egwu nke pVDF bụ ihe dịka 4500C. Mgbe eru 500 ℃, ngwa ngwa ire ere pụtara na uka na-ebelata ihe dị ka 70%. Mgbe okpomọkụ ruru 600 ℃, oke ahụ belatara site na 70%. Mgbe okpomọkụ ruru 300oC, oke CMC-Li belatara site na 70%. Mgbe okpomọkụ ruru 400 ℃, oke CMC-Li belatara 10%. CMLi dị mfe ire ere karịa pVDF na njedebe nke ndụ batrị.

2.2)Igwe ọkụ eletrik

S. Chou et al. Nsonaazụ ule gosiri na resistivity nke CMCLI-1, CMC-Li-2 na pVDF bụ 0.3154 Mn·m na 0.2634 Mn, n'otu n'otu. M na 20.0365 Mn·m, na-egosi na resistivity nke pVDF dị elu karịa nke CMLi, ihe omume nke CMC-LI dị mma karịa nke pVDF, na nhazi nke CMCLI.1 dị ala karịa nke CMCLI.2.

2.3)Electrochemical arụmọrụ

FM Courtel et al. mụọ akụkụ cyclic voltammetry nke electrodes dabere na poly-sulfonate (AQ) mgbe ejikọtara ihe dị iche iche. Ihe nkedo dị iche iche nwere mmeghachi omume oxidation na mbelata dị iche iche, ya mere ikike kachasị elu dị iche. N'ime ha, ikike oxidation nke CMLi bụ 2.15V, yana ikike mbelata bụ 2.55V. Ike oxidation na mbelata nke pVDF bụ 2.605 V na 1.950 V n'otu n'otu. E jiri ya tụnyere cyclic voltammetry curves nke ugboro abụọ gara aga, ọnụ ọgụgụ kasị elu nwere ike dị iche iche nke oxidation-mbelata ọnụ ọgụgụ kasị elu mgbe ejiri CMCLi binder dị ntakịrị karịa nke ahụ mgbe ejiri pVDF mee ihe, na-egosi na mmeghachi omume ahụ adịchaghị egbochi ya na ihe nkedo CMLi na-enye aka karị. ihe omume nke oxidation-mbelata mmeghachi omume.

2. Mmetụta ngwa na usoro nke CMC

1) Mmetụta ngwa

Pj Suo et al. mụọ ọrụ electrochemical nke Si / C composite ihe mgbe a na-eji pVDF na CMC dị ka ndị na-ejikọta ya, wee chọpụta na batrị na-eji CMC nwere ikike nke 700mAh / g na-agbanwe agbanwe maka oge mbụ ma ka nwere 597mAh / g mgbe 4O cycles, nke. dị elu karịa batrị site na iji pVDF. Jh Lee et al. mụọ mmetụta nke Ds nke CMC na nkwụsi ike nke nkwusioru graphite ma kwenye na nkwusioru mmiri mmiri nke Ds kpebiri. Na DS dị ala, CMC nwere akụrụngwa hydrophobic siri ike, ma nwee ike ịbawanye mmeghachi omume na elu graphite mgbe ejiri mmiri mee ihe dị ka mgbasa ozi. CMC nwekwara uru na ịnọgide na-enwe nkwụsi ike nke cyclic Njirimara silicon - tin alloy anode ihe. A kwadebere electrodes NiO dị iche iche (0.1mouL, 0.3mol / L na 0.5mol / L) CMC na pVDF binder, na ebubo ma wepụ ya na 1.5-3.5V na ugbu a nke 0.1c. N'oge okirikiri nke mbụ, ikike nke pVDF binder cell dị elu karịa nke CMC binder cell. Mgbe ọnụ ọgụgụ nke cycles ruru lO, ikike mwepụ nke pVDF binder na-ebelata n'ụzọ doro anya. Mgbe okirikiri 4JD gasịrị, ikike mwepu nke 0.1movL, 0.3MOUL na 0.5MovLPVDF gbadara ruo 250mAh / g, 157mAtv 'g na 102mAh / g, n'otu n'otu: Mwepu ikike nke batrị nwere 0.1 moL / L, 0.0. na 0.5 moL/LCMC ihe nkedo ka edobere na 698mAh/g, 555mAh/g na 550mAh/g, n'otu n'otu.

A na-eji ihe nkedo CMC na LiTI0. : na SnO2 nanoparticles na mmepụta mmepụta ihe. N'iji CMC dị ka ihe nkedo, LiFepO4 na Li4TI50l2 dị ka ihe dị mma na nke na-adịghị mma, n'otu n'otu, na iji pYR14FS1 dị ka ọkụ retardant electrolyte, a na-agbagharị batrị ugboro 150 na 0.1c ugbu a na 1.5v ~ 3.5V na okpomọkụ, na ihe dị mma kpọmkwem. A na-echekwa ike ya na 140mAh / g. N'ime salts metal dị iche iche na CMC, CMCLi na-ewebata ion metal ndị ọzọ, nke nwere ike igbochi "mmeghachi omume mgbanwe (vii)" na electrolyte n'oge mgbasa.

2) Usoro mmezi arụmọrụ

CMC Li ihe nkedo nwere ike melite electrochemical arụmọrụ nke AQ isi electrode na lithium batrị. M. E et al. -4 mere nchọpụta mmalite na usoro ahụ wee tụọ ihe nlereanya nke nkesa nke CMC-Li na AQ electrode. Ọmarịcha arụmọrụ nke CMLi sitere na mmetụta njikọ siri ike nke njikọ hydrogen nke OH mepụtara, nke na-enye aka na nhazi nke ntupu nke ọma. CMC-Li hydrophilic agaghị agbaze na organic electrolyte, n'ihi ya, ọ nwere ezigbo nkwụsi ike na batrị ahụ, ma nwee ike na-ejikọta ya na nhazi electrode, nke na-eme ka batrị ahụ nwee ezigbo nkwụsi ike. Cmc-li ihe nkedo nwere ezigbo Li conductivity n'ihi na e nwere ọnụ ọgụgụ buru ibu nke ọrụ dị iche iche na molekụla yinye nke CMC-Li. N'oge mwepu, e nwere ụzọ abụọ nke ihe ndị dị irè na-arụ ọrụ na Li: (1) Li na electrolyte; (2) Li na molekụla yinye nke CMC-Li nso etiti dị irè nke ihe na-arụ ọrụ.

Mmeghachi omume nke hydroxyl otu na hydroxyl otu na carboxymethyl CMC-Li ihe nkedo ga-etolite covalent njikọ; N'okpuru ọrụ nke eletriki eletrik, U nwere ike ịnyefe na agbụ molecular ma ọ bụ n'akụkụ ihe nkedo molecular, ya bụ, a gaghị emebi usoro ihe omume ahụ; N'ikpeazụ, Lj ga-ejikọta na urughuru AQ. Nke a na-egosi na ngwa CMLi ọ bụghị naanị na-eme ka ọrụ mbufe nke Li dịkwuo mma, kamakwa ọ na-eme ka ọnụọgụ AQ na-arụ ọrụ dị mma. Ọdịnaya dị elu nke chH: COOli na 10Li na yinye molekụla, ọ na-adị mfe ịnyefe Li. M. Arrmand et al. kwenyere na ogige organic nke -COOH ma ọ bụ OH nwere ike meghachi omume na 1 Li n'otu n'otu wee mepụta 1 C00Li ma ọ bụ 1 0Li na ikike dị ala. Iji nyochaa usoro nke CMLi binder na electrode, a na-eji CMC-Li-1 mee ihe dị ka ihe na-arụ ọrụ ma nweta nkwubi okwu ndị yiri ya. Li na-emeghachi omume na otu chH, COOH na otu 0H sitere na CMC Li wee wepụta chH: COOli na otu 0 “otu n'otu, dị ka egosiri na nha anya (1) na (2)

Ka ọnụ ọgụgụ nke chH, COOli, na OLi na-abawanye, DS nke CMC-Li na-abawanye. Nke a na-egosi na organic oyi akwa esịnede tumadi nke AQ urughuru n'elu ihe nkedo na-aghọ ọzọ mụ na mfe nyefee Li. CMLi bụ polima na-eduzi nke na-enye ụzọ njem maka Li iru n'elu akụkụ AQ. CMCLi binders nwere ezi eletrọnịkị na ionic conductivity, nke na-arụpụta ezi electrochemical arụmọrụ na ogologo okirikiri ndụ nke CMLi electrodes. JS Bridel et al. kwadebere anode nke lithium ion batrị site na iji silicon / carbon / polymer composite material with different binders iji mụọ mmetụta nke mmekọrịta dị n'etiti silicon na polymer na arụmọrụ zuru oke nke batrị ahụ, wee chọpụta na CMC nwere arụmọrụ kachasị mma mgbe ejiri ya mee ihe dị ka ihe nkedo. Enwere njikọ hydrogen siri ike n'etiti silicon na CMC, nke nwere ike ịgwọ onwe ya ma nwee ike ịhazigharị nrụgide na-arịwanye elu nke ihe ahụ n'oge usoro ịgba ígwè iji nọgide na-enwe nkwụsi ike nke nhazi ihe. Site na CMC dị ka ihe nkedo, ikike nke silicon anode nwere ike idowe karịa 1000mAh / g na opekata mpe 100 okirikiri, yana arụmọrụ coulomb dị nso 99.9%.

3, nkwubi okwu

Dị ka ihe nkedo, CMC ihe nwere ike iji dị iche iche nke electrode ihe dị ka eke graphite, meso-phase carbon microspheres (MCMB), lithium titanate, tin dabeere silicon dabeere anode ihe na lithium iron phosphate anode ihe, nke nwere ike melite batrị. ikike, nkwụsi ike okirikiri na ndụ okirikiri ma e jiri ya tụnyere pYDF. Ọ bara uru na nkwụsi ike nke okpomọkụ, conductivity eletriki na ihe ndị na-emepụta ihe nke CMC. Enwere isi ụzọ abụọ maka CMC iji melite arụmọrụ nke batrị lithium ion:

(1) Ọrụ njikọta kwụsiri ike nke CMC na-emepụta ihe dị mkpa maka ịnweta arụmọrụ batrị kwụsiri ike;

(2) CMC nwere ezigbo elektrọn na ion conductivity ma nwee ike ịkwalite mbufe Li