Batrị lithium-ion na-etolite n'ụzọ nke njupụta ike dị elu. N'ime ụlọ okpomọkụ, silicon dabeere na-adịghị mma electrode ihe alloy na lithium na-emepụta lithium-ọgaranya ngwaahịa Li3.75Si na-adọ, na a kpọmkwem ikike nke ruo 3572 mAh / g, nke bụ nnọọ elu karịa theoretical kpọmkwem ikike nke graphite ọjọọ electrode 372 mAh/g. Otú ọ dị, n'oge ugboro ugboro nchaji na ịchaji usoro nke silicon dabeere na-adịghị mma electrode ihe, na-adọ mgbanwe nke Si na Li3.75Si nwere ike na-emepụta nnukwu ibu mgbasa (banyere 300%), nke ga-eduga structural powdering nke electrode ihe na-aga n'ihu guzobe nke electrode. Ihe nkiri SEI, na n'ikpeazụ mee ka ikike daa ngwa ngwa. Ụlọ ọrụ ahụ na-eme ka arụmọrụ nke ihe ndị na-adịghị mma na-adabere na silicon na nkwụsi ike nke batrị dabeere na silicon site na nano-sizing, carbon cover, pore formation na teknụzụ ndị ọzọ.
Ihe ndị carbon nwere ezigbo conductivity, ọnụ ala dị ala, yana nnukwu isi mmalite. Ha nwere ike melite conductivity na nkwụsi ike elu nke ihe ndị dabeere na silicon. A na-eji ha nke ọma dị ka mgbakwunye nkwalite arụmọrụ maka elektrọd ọjọọ dabere na silicon. Ihe silicon-carbon bụ ntụzịaka mmepe nke elektrọd ọjọọ sitere na silicon. Ihe mkpuchi carbon nwere ike melite nkwụsi ike elu nke ihe ndị dabeere na silicon, mana ikike ya igbochi mgbasawanye ụda silicon bụ n'ozuzu ya enweghị ike idozi nsogbu nke mgbasawanye ụda silicon. Ya mere, iji meziwanye nkwụsi ike nke ihe ndị dabeere na silicon, ọ dị mkpa ka e wuo ihe owuwu porous. Ngwunye bọọlụ bụ usoro mepere emepe maka ịkwadebe nanomaterials. Enwere ike ịgbakwunye ihe mgbakwunye dị iche iche ma ọ bụ ihe dị iche iche na slurry enwetara site na-egwe ọka dị ka ihe achọrọ nke ihe mejupụtara. A na-agbasasị slurry ahụ nke ọma site na slurries dị iche iche ma fesa ya. N'oge usoro ihicha ozugbo, nanoparticles na ihe ndị ọzọ dị na slurry ga-etolite n'otu ntabi anya n'ụdị nhazi. Akwukwo a na-eji igwe igwe emeputa ihe na ihe omume gburugburu ebe obibi na teknụzụ ịsa mmiri iji kwadebe ihe ndị nwere silicon.
A pụkwara imeziwanye arụmọrụ nke ihe ndị dabeere na silicon site na ịhazi ọdịdị ọdịdị na nkesa nke silicon nanomaterials. Ka ọ dị ugbu a, a kwadebere ihe ndị dabeere na silicon nke nwere ụdị ọdịdị dị iche iche na njirimara nkesa, dị ka silicon nanorods, porous graphite agbakwunyere nanosilicon, nanosilicon na-ekesa na carbon spheres, silicon / graphene array porous structures, wdg N'otu ọnụ ọgụgụ, tụnyere nanoparticles. , nanosheets nwere ike ime ka nsogbu ahụ na-etipịa ihe nke ọma kwụsị site na mgbasawanye olu, na ihe ahụ nwere njupụta dị elu. Mpempe akwụkwọ nanosheets na-emebi emebi nwekwara ike mepụta usoro nwere oghere. Iji sonye na otu mgbanwe mgbanwe silicon ọjọọ electrode. Nye ohere nchekwa maka mgbasawanye olu nke ihe silicon. Iwebata carbon nanotubes (CNTs) nwere ike ọ bụghị naanị melite conductivity nke ihe onwunwe, ma na-akwalite guzobe porous owuwu nke ihe ruru ya otu akụkụ morphological e ji mara. Enweghị akụkọ ọ bụla gbasara ụlọ nwere oghere nke silicon nanosheets na CNT rụrụ. Nke a akwụkwọ adopts na industrially ọdabara bọọlụ egwe ọka, egweri na dispersion, ịgba ihicha, carbon pre mkpuchi na calcination ụzọ, na-ewebata porous akwalite na nkwadebe usoro iji kwadebe porous silicon dabeere na-adịghị mma electrode ihe kpụrụ site onwe-mgbakọ nke silicon nanosheets na. Ndị CNT. Usoro nkwadebe dị mfe, enyi na gburugburu ebe obibi, ọ dịghịkwa ihe mkpofu mmiri ma ọ bụ ihe mkpofu adịghị eme. Enwere ọtụtụ akwụkwọ akụkọ gbasara mkpuchi carbon nke ihe ndị sitere na silicon, mana enwere mkparịta ụka dị omimi banyere mmetụta mkpuchi. Akwụkwọ a na-eji asphalt dị ka ikuku carbon iji nyochaa mmetụta nke ụzọ mkpuchi carbon abụọ, mkpuchi mmiri mmiri na mkpuchi oge siri ike, na mmetụta mkpuchi na arụmọrụ nke ihe electrode na-adịghị mma nke silicon.
1 Nnwale
1.1 Nkwadebe ihe
Nkwadebe nke ihe mejupụtara silicon-carbon porous na-agụnye usoro ise: igwe-egwe ọka, egweri na mgbasa, ịgbasa ihicha, carbon pre- mkpuchi na carbonization. Nke mbụ, tụọ 500 g nke ntụ ntụ silicon mbụ (ụlọ, 99.99% ịdị ọcha), gbakwunye 2000 g nke isopropanol, wee mee igwe igwe mmiri mmiri na igwe igwe bọọlụ nke 2000 r / min maka awa 24 iji nweta nano-scale silicon slurry. The enwetara silicon slurry na-ebufe na a dispersion nyefe tank, na ihe na-agbakwunyere dị ka uka ruru nke silicon: graphite (mepụtara na Shanghai, batrị ọkwa): carbon nanotubes (mepụtara na Tianjin, batrị ọkwa): polyvinyl pyrrolidone (mepụtara). na Tianjin, ọkwa nyocha) = 40:60:1.5:2. A na-eji isopropanol emeziwanye ihe siri ike, na ihe siri ike na-eme ka ọ bụrụ 15%. A na-eme ihe na-egweri na nkesa na ọsọ mgbasa nke 3500 r / min maka 4 h. A na-atụnyere ìgwè ọzọ nke slurries na-enweghị agbakwunye CNT, na ihe ndị ọzọ bụ otu. A na-ebufe slurry a chụsasịrị enwetara na tank nri na-ehicha ihe, a na-arụkwa ihicha mmiri n'ime ikuku echekwara nitrogen, ebe nbata na nbata na-adị 180 na 90 Celsius C, n'otu n'otu. Mgbe ahụ, atụnyere ụdị mkpuchi carbon abụọ, mkpuchi oge siri ike na mkpuchi mmiri mmiri. The siri ike na-adọ mkpuchi usoro bụ: na ịgba-Fikiere ntụ ntụ na-agwakọta na 20% asphalt ntụ ntụ (mere na Korea, D50 bụ 5 μm), weere na a n'ibu igwekota 10 min, na Ịgwakọta ọsọ bụ 2000 r / min iji nweta. ntụ ntụ kpuchiri mbụ. Usoro mkpuchi nke mmiri mmiri bụ: a na-agbakwunye ntụ ntụ a mịrị amị na-agbakwunye na ngwọta xylene (mere na Tianjin, ọkwa nyocha) nwere 20% asphalt gbazere na ntụ ntụ na ọdịnaya siri ike nke 55%, na agụụ kpalitere ọbụna. Ime na a agụụ oven na 85 ℃ maka 4h, tinye n'ime a n'ibu igwekota maka ịgwakọta, na Ịgwakọta ọsọ bụ 2000 r / min, na Ịgwakọta oge bụ 10 min iji nweta tupu ntekwasa ntụ ntụ. N'ikpeazụ, a na-agbakọta ntụ ntụ nke e kpuchiri mbụ n'ime ọkụ rotary n'okpuru ikuku nitrogen na ọnụego okpomọkụ nke 5 ° C / min. A na-edobe ya na okpomọkụ nke 550 ° C maka 2h, wee nọgide na-ekpo ọkụ ruo 800 Celsius ma na-echekwa ya na okpomọkụ maka 2h, wee mee ka ọ dị jụụ ruo n'okpuru 100 ° C wee wepụ ya iji nweta silicon-carbon. ihe mejupụtara.
1.2 Ụzọ njirimara
A na-enyocha nkesa nke ihe ahụ site na iji ihe nleba anya nha (ụdị Mastersizer 2000, nke emere na UK). A nwalere ntụ ntụ ndị e nwetara na nzọụkwụ nke ọ bụla site na nyocha eletrọn microscopy (Regulus8220, nke emere na Japan) iji nyochaa ọdịdị ọdịdị na nha nke ntụ ntụ. A na-enyocha usoro nhazi nke ihe ahụ site na iji X-ray powder diffraction analyzer (D8 ADVANCE, nke emere na Jamanị), wee nyochaa ihe mejupụtara ihe ahụ site na iji ihe nleba anya ike. A na-eji ihe mejupụtara silicon-carbon enwetara wee mee bọtịnụ ọkara cell nke ihe nlereanya CR2032, yana oke silicon-carbon: SP: CNT: CMC: SBR bụ 92: 2: 2: 1.5: 2.5. The counter electrode bụ a metal lithium mpempe akwụkwọ, na electrolyte bụ a azụmahịa electrolyte (ihe nlereanya 1901, mere na Korea), Celgard 2320 diaphragm na-eji, ụgwọ na mwepu voltaji nso bụ 0.005-1.5 V, ụgwọ na mwepụ ugbu a bụ 0.1 C. (1C = 1A), na mwepu mwepu ugbu a bụ 0.05 C.
Iji nyochaa n'ihu na arụmọrụ nke ihe mejupụtara silicon-carbon, e mere obere batrị dị nro 408595. Igwe elektrọd dị mma na-eji NCM811 (emere na Hunan, ọkwa batrị), yana graphite na-adịghị mma ejiri ihe 8% silicon-carbon doped. The mma electrode slurry usoro bụ 96% NCM811, 1.2% polyvinylidene fluoride (PVDF), 2% conductive agent SP, 0.8% CNT, na NMP na-eji dị ka dispersant; na-adịghị mma electrode slurry usoro bụ 96% mejupụtara ọjọọ electrode ihe, 1.3% CMC, 1.5% SBR 1.2% CNT, na mmiri na-eji dị ka dispersant. Mgbe a na-akpali akpali, mkpuchi, mpịakọta, ịkpụ, lamination, ịgbado ọkụ taabụ, nkwakọ ngwaahịa, mmiri, mmiri mmiri injection, nhazi na ike nkewa, 408595 laminated obere obere ngwugwu batrị nwere ikike nke 3 Ah kwadoro. A nwalere arụmọrụ ọnụego nke 0.2C, 0.5C, 1C, 2C na 3C yana arụmọrụ okirikiri nke ụgwọ 0.5C na mwepu 1C. Ọnụ ego a na-akwụ na voltaji na-agbapụta bụ 2.8-4.2 V, chaja chaja na-adị ugbu a na mgbe niile, na nkwụsị nke ugbu a bụ 0.5C.
2 Nsonaazụ na mkparịta ụka
A hụrụ ntụ ntụ silicon mbụ site na nyocha eletrọnịkị microscopy (SEM). Uzuzu silicon bụ granular na-adịghị agafe agafe na nha nha nke na-erughị 2μm, dị ka egosiri na eserese 1 (a). Mgbe e mechachara bọọlụ, a na-ebelata oke ntụ ntụ silicon ka ọ bụrụ ihe dịka 100 nm [Foto 1 (b)]. Nnwale nha nha ahụ gosiri na D50 nke silicon ntụ ntụ mgbe egwe ọka bọọlụ bụ 110 nm na D90 bụ 175 nm. Nyochaa nlezianya anya nke ọdịdị nke silicon ntụ ntụ mgbe egwe ọka bọọlụ na-egosi usoro nke na-adịghị mma (nhazi nke ihe ọkpụkpụ na-eme ka ọ dịkwuo mma site na cross-section SEM emechaa). Ya mere, D90 data enwetara site urughuru size ule kwesịrị ịbụ ogologo akụkụ nke nanosheet. Ejikọtara ya na nsonaazụ SEM, enwere ike ikpebi na nha nke nanosheet nwetara dị ntakịrị karịa uru dị oke egwu nke 150 nm nke nkwụsị nke ntụ ntụ silicon n'oge ịchaji na ịwụpụ na ọ dịkarịa ala otu akụkụ. Nhazi nke morphology flaky bụ tumadi n'ihi ike nkewa dị iche iche nke ụgbọ elu kristal nke silikoni kristal, n'ime nke {111} ụgbọ elu nke silicon nwere ike dissociation dị ala karịa ụgbọ elu kristal {100} na {110}. Ya mere, ụgbọ elu kristal a na-adị mfe karị site na-egwe ọka, na n'ikpeazụ na-etolite a flaky Ọdịdị. Ọdịdị ahụ na-egbuke egbuke na-eme ka nchịkọta nke ihe ndị na-adịghị mma, na-edobe ohere maka mgbasawanye nke silicon, ma na-eme ka nkwụsi ike nke ihe ahụ dịkwuo mma.
A na-efesa slurry nwere nano-silicon, CNT na graphite, na ntụ ntụ tupu na mgbe ịgbasasịrị SEM na-enyocha ya. E gosipụtara nsonaazụ ya na eserese 2. Matrix graphite agbakwunyere tupu ịgbasa bụ ụdị flake a na-ahụkarị nke nwere nha 5 ruo 20 μm [Foto 2 (a)]. The urughuru size nkesa ule nke graphite na-egosi na D50 bụ 15μm. Ntụ ntụ a na-enweta mgbe ọ gbasasịrị nwere morphology gburugburu [Foto 2 (b)], a pụkwara ịhụ na a na-ekpuchi graphite site na mkpuchi mkpuchi mgbe ọ gbasasịrị. D50 nke ntụ ntụ mgbe ịgbasachara bụ 26.2 μm. Achọpụtara njirimara morphological nke ụmụ irighiri ihe nke abụọ site na SEM, na-egosi njirimara nke ihe ọkpụkpụ na-adịghị mma nke nanomaterials na-akwakọba [Foto 2 (c)]. Ihe owuwu porous bụ silicon nanosheets na CNTs jikọtara ọnụ [Foto 2 (d)], na ebe nnwale kpọmkwem (BET) dị elu dị ka 53.3 m2/g. Ya mere, mgbe spraying, silicon nanosheets na CNTs onwe-ezukọta na-etolite a porous Ọdịdị.
A na-eji mkpuchi carbon mmiri mmiri gwọọ oyi akwa ahụ, na mgbe agbakwunyere mkpuchi mkpuchi carbon precursor pitch na carbonization, a na-eme nchọpụta SEM. E gosipụtara nsonaazụ ya na eserese 3. Mgbe carbon pre mkpuchi, elu nke akụkụ nke abụọ na-adị ire ụtọ, nke nwere mkpuchi mkpuchi doro anya, na mkpuchi zuru oke, dị ka egosiri na 3 (a) na (b). Mgbe carbonization gasịrị, akwa mkpuchi elu na-edobe ọnọdụ mkpuchi dị mma [Foto 3 (c)]. Tụkwasị na nke ahụ, ihe oyiyi SEM nke cross-section na-egosi nanoparticles nke nwere mpempe akwụkwọ [Foto 3(d)], nke kwekọrọ na njirimara morphological nke nanosheets, na-achọpụtakwu na e guzobere nanosheets silicon mgbe egwe ọka. Na mgbakwunye, eserese 3 (d) na-egosi na enwere ndochi n'etiti ụfọdụ nanosheets. Nke a bụ tumadi n'ihi iji usoro mkpuchi nke mmiri mmiri. Ngwọta asphalt ga-abanye n'ime ihe ahụ, nke mere na elu nke nanosheets silicon dị n'ime na-enweta ihe mkpuchi mkpuchi carbon. Ya mere, site na iji mmiri mmiri na-adọ mkpuchi, na mgbakwunye na inweta nke abụọ urughuru mkpuchi mmetụta, na okpukpu abụọ carbon mkpuchi mmetụta nke isi urughuru mkpuchi nwekwara ike nweta. A na-anwale ntụ ntụ carbonized site na BET, na nsonaazụ ule bụ 22.3 m2 / g.
A na-edobe ntụ ntụ carbonized na nyocha nke ike dị iche iche (EDS), na-egosikwa nsonaazụ ya na Figure 4 (a). Isi micron-sized bụ akụkụ C, kwekọrọ na matrix graphite, na mkpuchi mpụta nwere silicon na oxygen. Iji nyochaa n'ihu na nhazi nke silicon, a na-eme nyocha X-ray diffraction (XRD), na-egosi na nsonaazụ ya na foto 4 (b). Ihe mejupụtara ya bụ graphite na silicon otu-kristal, na-enweghị njirimara silicon oxide doro anya, na-egosi na akụkụ oxygen nke ule ụdị ume dị iche iche sitere na oxidation eke nke elu silicon. A na-edekọ ihe mejupụtara silicon-carbon dị ka S1.
Ihe eji eme silicon-carbon S1 a kwadebere ka etinyere ụdị bọtịnụ ụdị ọkara cell na ule ịgbasa. A na-egosi usoro mbufe mbufe mbụ na eserese 5. Ike a kapịrị ọnụ bụ 1000.8 mAh / g, na arụmọrụ okirikiri nke mbụ dị elu dị ka 93.9%, nke dị elu karịa arụmọrụ mbụ nke ọtụtụ ihe ndị sitere na silicon na-enweghị tupu. lithiation kọrọ na akwụkwọ. Ịrụ ọrụ mbụ dị elu na-egosi na ihe mejupụtara silicon-carbon a kwadebere nwere nkwụsi ike dị elu. Iji nyochaa mmetụta nke ihe owuwu porous, netwọk na-eduzi na mkpuchi carbon na nkwụsi ike nke ihe silicon-carbon, a kwadebere ụdị ihe abụọ nke silicon-carbon na-agbakwunyeghị CNT na enweghị mkpuchi carbon mbụ.
A na-egosi morphology nke ntụ ntụ carbonized nke silicon-carbon composite material na-enweghị agbakwunyere CNT na Figure 6. Mgbe mkpuchi mmiri mmiri na carbonization gasịrị, a pụrụ ịhụ oyi akwa mkpuchi nke ọma n'elu akụkụ nke abụọ na Figure 6 (a). A na-egosi akụkụ nke akụkụ SEM nke ihe carbonized na foto 6 (b). Ngwunye nke nanosheets silicon nwere njirimara porous, na ule BET bụ 16.6 m2/g. Otú ọ dị, e jiri ya tụnyere ikpe ahụ na CNT [dị ka egosiri na Figure 3 (d), ule BET nke ntụ ntụ carbonized bụ 22.3 m2 / g], njupụta nke nano-silicon stacking njupụta dị elu, na-egosi na mgbakwunye nke CNT nwere ike ịkwalite. nhazi nke ihe owuwu porous. Tụkwasị na nke ahụ, ihe ahụ enweghị netwọk na-eduzi akụkụ atọ nke CNT rụrụ. A na-edekọ ihe mejupụtara silicon-carbon dị ka S2.
A na-egosi njirimara morphological nke silicon-carbon composite material nke a kwadebere site na mkpuchi carbon siri ike na-egosi na 7. Mgbe carbonization gasịrị, e nwere ihe mkpuchi mkpuchi doro anya n'elu, dị ka e gosiri na 7 (a). Onyonyo 7(b) na-egosi na e nwere nanoparticles nke yiri nkewa na mpaghara obe, nke dabara na njirimara morphological nke nanosheets. Mkpokọta nanosheets na-etolite usoro porous. Enweghị ihe nkpuchi doro anya n'elu nanosheets dị n'ime, na-egosi na mkpuchi carbon siri ike na-emepụta naanị mkpuchi mkpuchi carbon nke nwere usoro porous, na enweghị mkpuchi mkpuchi nke ime maka nanosheets silicon. A na-edekọ ihe mejupụtara silicon-carbon dị ka S3.
A na-eme ule ụgwọ ọkara cell ụdị bọtịnụ na S2 na S3. Ikike a kapịrị ọnụ na arụmọrụ mbụ nke S2 bụ 1120.2 mAh / g na 84.8%, n'otu n'otu, na ikike akọwapụtara na arụmọrụ mbụ nke S3 bụ 882.5 mAh / g na 82.9%, n'otu n'otu. Ikike a kapịrị ọnụ na arụmọrụ mbụ nke ihe atụ S3 siri ike kpuchie bụ nke kachasị dị ala, na-egosi na ọ bụ naanị mkpuchi carbon nke ihe owuwu porous ka a na-eme, na emeghị ihe mkpuchi carbon nke nanosheets silicon dị n'ime, nke na-enweghị ike inye egwuregwu zuru oke. na ikike kpọmkwem nke ihe na-adabere na silicon na enweghị ike ichebe elu nke ihe ndị dabeere na silicon. Ọrụ mbụ nke S2 sample na-enweghị CNT dịkwa ala karịa nke ihe mejupụtara silicon-carbon nke nwere CNT, na-egosi na dabere na oyi akwa mkpuchi dị mma, netwọk na-eduzi na ogo dị elu nke ihe owuwu porous na-eme ka nkwalite ahụ dịkwuo mma. nke ụgwọ na mwepu arụmọrụ nke silicon-carbon ihe.
A na-eji ihe S1 silicon-carbon mee obere batrị dị nro zuru oke iji nyochaa arụmọrụ ọnụego na arụmọrụ okirikiri. Egosiri mkpụgharị ọnụego mwepụta na eserese 8 (a). Ike mwepu nke 0.2C, 0.5C, 1C, 2C na 3C bụ 2.970, 2.999, 2.920, 2.176 na 1.021 Ah, n'otu n'otu. Ọnụego mwepu 1C dị elu dị ka 98.3%, mana ọnụego mwepu nke 2C na-adaba na 73.3%, ọnụego mwepu 3C na-agbada n'ihu ruo 34.4%. Iji sonye na otu mgbanwe silicon ọjọọ electrode, biko tinye WeChat: shimobang. N'ihe gbasara ọnụego ụgwọ, 0.2C, 0.5C, 1C, 2C na 3C ike ịchaji bụ 3.186, 3.182, 3.081, 2.686 na 2.289 Ah, n'otu n'otu. Ọnụ ego nchaji 1C bụ 96.7%, yana ọnụego nchaji 2C ka ruru 84.3%. Agbanyeghị, na-elele usoro nchaji na eserese 8 (b), ikpo okwu chaja 2C buru ibu karịa ikpo okwu chaja 1C, yana ikike chaja chaja ya mgbe niile na-akpata ihe ka ọtụtụ (55%), na-egosi na polarization nke batrị nwere ike ịchaji 2C bụ. ugbua buru ibu. Ihe siliki-carbon nwere ezigbo nchaji na ịrụ ọrụ na-arụ ọrụ na 1C, mana njirimara nhazi nke ihe ahụ kwesịrị imeziwanye ya iji nweta arụmọrụ dị elu. Dị ka egosiri na eserese 9, mgbe usoro 450 gasịrị, ọnụ ọgụgụ njide ikike bụ 78%, na-egosi arụmọrụ okirikiri dị mma.
Ọnọdụ elu nke electrode tupu na mgbe SEM nyochachara okirikiri ahụ, a na-egosipụtakwa nsonaazụ ya na Figure 10. Tupu okirikiri, elu nke graphite na silicon-carbon ihe doro anya [Njirimara 10 (a)]; mgbe okirikiri ahụ gasịrị, a na-emepụta oyi akwa mkpuchi n'elu [Njirimara 10 (b)], nke bụ ihe nkiri SEI siri ike. Ihe nkiri SEI na-eri nri lithium na-arụ ọrụ dị elu, nke na-adịghị akwado arụmọrụ okirikiri. Ya mere, ịkwalite nguzobe nke ihe nkiri SEI dị mma (dị ka ihe owuwu ihe nkiri SEI artificial, na-agbakwunye mgbakwunye electrolyte kwesịrị ekwesị, wdg) nwere ike imeziwanye arụmọrụ okirikiri. Nleba anya nke akụkụ SEM nke akụkụ silicon-carbon mgbe okirikiri ahụ gasịrị [Foto 10(c)] na-egosi na ihe mbụ silicon nanoparticles nke nwere warara aghọọla nke ukwuu ma kpochapụ ihe owuwu ahụ. Nke a bụ n'ihi na mmụba olu na-aga n'ihu na mbelata nke ihe silicon-carbon n'oge okirikiri. Ya mere, ekwesịrị ịkwalite ihe owuwu porous iji nye ohere nchekwa zuru oke maka mgbasawanye olu nke ihe dabere na silicon.
3 Nkwubi okwu
Dabere na mgbasawanye olu, conductivity na-adịghị mma na nkwụsi ike na-adịghị mma nke ihe ndị na-adịghị mma nke silicon dabeere na ihe electrode na-adịghị mma, akwụkwọ a na-eme ka mmezi ezubere iche, site na morphology nhazi nke silicon nanosheets, ihe owuwu ihe owuwu, ihe owuwu netwọk na-eduzi na mkpuchi carbon zuru oke nke akụkụ abụọ nke abụọ. , iji meziwanye nkwụsi ike nke ihe electrode ọjọọ nke dabeere na silicon n'ozuzu ya. Mkpokọta nke silicon nanosheets nwere ike ịmepụta ihe owuwu porous. Iwebata CNT ga-akwalite n'ihu n'ichebe ihe owuwu porous. Ihe mejupụtara silicon-carbon nke a kwadebere site na mkpuchi mmiri mmiri nwere mmetụta mkpuchi carbon okpukpu abụọ karịa nke a kwadebere site na mkpuchi oge siri ike, ma gosipụta ikike dị elu na arụmọrụ mbụ. Na mgbakwunye, arụmọrụ mbụ nke ihe mejupụtara silicon-carbon nwere CNT dị elu karịa nke ahụ na-enweghị CNT, nke bụ n'ihi oke ogo dị elu nke ihe owuwu porous iji belata mgbasawanye olu nke ihe dabere na silicon. Ntinye nke CNT ga-ewulite netwọk na-eduzi akụkụ atọ, meziwanye ihe omume nke ihe ndị dabeere na silicon, ma gosipụta arụmọrụ ọnụego dị mma na 1C; na ihe na-egosi arụmọrụ okirikiri dị mma. Otú ọ dị, ọ dị mkpa ka a na-ewusi ihe ahụ ike ike iji nye ohere nchekwa zuru ezu maka mgbasawanye olu nke silicon, ma kwalite nhazi nke dị nro.na nnukwu ihe nkiri SEI iji meziwanye arụmọrụ okirikiri nke ihe mejupụtara silicon-carbon.
Anyị na-enyekwa ngwaahịa graphite dị ọcha na silicon carbide, nke a na-ejikarị na nhazi wafer dị ka oxidation, mgbasa, na annealing.
Nabata ndị ahịa ọ bụla si n'akụkụ ụwa niile ka ha bịa leta anyị maka mkparịta ụka ọzọ!
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Oge nzipu: Nov-13-2024