Batrị Lithium-ion na-etolite n'ụzọ dị elu njupụta ike. N'ọnọdụ okpomọkụ ụlọ, ihe electrode na-adịghị mma nke dabere na silicon na-ejikọta ya na lithium iji mepụta ngwaahịa bara ụba na lithium nke Li3.75Si, nke nwere ikike pụrụ iche nke ruru 3572 mAh/g, nke dị elu karịa ikike pụrụ iche nke electrode na-adịghị mma nke graphite 372 mAh/g. Agbanyeghị, n'oge usoro ịchaji na mwepụta ugboro ugboro nke ihe electrode na-adịghị mma nke dabere na silicon, mgbanwe usoro nke Si na Li3.75Si nwere ike imepụta nnukwu mgbasawanye olu (ihe dị ka 300%), nke ga-eduga na ntụ ntụ nke ihe electrode na nhazi na-aga n'ihu nke ihe nkiri SEI, ma mechaa mee ka ikike ahụ daa ngwa ngwa. Ụlọ ọrụ ahụ na-eme ka arụmọrụ nke ihe electrode na-adịghị mma nke dabere na silicon ka mma na nkwụsi ike nke batrị dabere na silicon site na nha nano, mkpuchi carbon, nhazi oghere na teknụzụ ndị ọzọ.
Ihe ndị e ji carbon mee nwere ezigbo ike ịrụ ọrụ, ọnụ ala dị ala, na ebe ndị sara mbara. Ha nwere ike ime ka ike ịrụ ọrụ na nkwụsi ike elu nke ihe ndị e ji silicon mee ka ọ dịkwuo mma. A na-ejikarị ha eme ihe dị ka ihe mgbakwunye mmezi arụmọrụ maka elektrọd ndị na-adịghị mma dabere na silicon. Ihe ndị e ji silicon mee bụ isi ihe na-akwalite mmepe elektrọd ndị na-adịghị mma dabere na silicon. Mkpuchi carbon nwere ike ime ka ike ịrụ ọrụ nke ihe ndị e ji silicon mee ka ọ dịkwuo mma, mana ikike ya igbochi mgbasawanye olu silicon bụ ihe zuru oke ma ọ nweghị ike idozi nsogbu nke mgbasawanye olu silicon. Ya mere, iji melite nkwụsi ike nke ihe ndị e ji silicon mee, a ga-ewu ihe owuwu ndị nwere oghere. Ịkpụ bọọlụ bụ ụzọ mmepụta ihe maka ịkwadebe ihe ndị na-emepụta ihe dị iche iche. Enwere ike itinye ihe mgbakwunye ma ọ bụ ihe ndị e ji ihe mee ihe dị iche iche na slurry nke e ji bọọlụ mee dịka ihe achọrọ maka imewe nke ihe mejupụtara ya si dị. A na-agbasa slurry ahụ n'otu aka ahụ site na slurries dị iche iche ma kpọọ nkụ. N'oge usoro nkụ ngwa ngwa, nanoparticles na ihe ndị ọzọ dị na slurry ga-emepụta njirimara nhazi oghere. Akwụkwọ a na-eji igwe egwe bọọlụ na teknụzụ nkụ mmiri ịgba mmiri nke e ji silicon mee iji kwadebe ihe ndị e ji silicon mee nke nwere oghere.
Enwere ike imeziwanye arụmọrụ nke ihe ndị dabere na silicon site na ịchịkwa ọdịdị na njirimara nkesa nke ihe ndị sitere na silicon. Ugbu a, a kwadebela ihe ndị dabere na silicon nwere ụdị dị iche iche na njirimara nkesa, dị ka silicon nanorods, porous graphite embedded nanosilicon, nanosilicon kesara na carbon spheres, silicon/graphene array porous structures, wdg. N'otu nha ahụ, ma e jiri ya tụnyere nanoparticles, nanosheets nwere ike igbochi nsogbu nke mgbasawanye olu kpatara, ihe ahụ nwekwara njupụta compaction dị elu. Ndokọ nanosheets na-adịghị mma nwekwara ike ịmepụta nhazi porous. Iji sonye na otu mgbanwe electrode silicon na-adịghị mma. Nye oghere nchekwa maka mgbasawanye olu nke ihe silicon. Ntinye nke carbon nanotubes (CNTs) nwere ike ọ bụghị naanị imeziwanye njikwa nke ihe ahụ, kamakwa ịkwalite nhazi nke usoro porous nke ihe ahụ n'ihi njirimara morphological ya otu akụkụ. Enweghị akụkọ gbasara ihe owuwu porous nke silicon nanosheets na CNTs wuru. Akwụkwọ a na-eji igwe egwe bọọlụ, igwe egwe na mgbasa, ịchacha ihe, mkpuchi tupu carbon na usoro calcination, ma na-ewebata ndị na-akwalite oghere n'usoro nkwadebe iji kwadebe ihe electrode na-adịghị mma dabere na silicon nke ejiri aka ha mepụta nke silicon nanosheets na CNTs. Usoro nkwadebe ahụ dị mfe, ọ naghị emerụ gburugburu ebe obibi ahụ, a naghịkwa emepụta ihe mkpofu ma ọ bụ ihe mkpofu. Enwere ọtụtụ akụkọ akwụkwọ gbasara mkpuchi carbon nke ihe ndị dabere na silicon, mana enwere obere mkparịta ụka miri emi gbasara mmetụta nke mkpuchi. Akwụkwọ a na-eji asphalt dị ka isi iyi carbon iji nyochaa mmetụta nke ụzọ mkpuchi carbon abụọ, mkpuchi mmiri mmiri na mkpuchi siri ike, na mmetụta mkpuchi na arụmọrụ nke ihe electrode na-adịghị mma dabere na silicon.
Nnwale 1
1.1 Nkwadebe ihe
Nkwadebe nke ihe mejupụtara silicon-carbon nwere oghere gụnyere usoro ise: igwe egwe bọọlụ, igwe egwe na mgbasa, nkụ mmiri, mkpuchi carbon tupu carbon na carbonization. Nke mbụ, tụọ 500 g nke ntụ silicon mbụ (ịdị ọcha nke ụlọ, 99.99%), tinye 2000 g nke isopropanol, ma mee igwe egwe bọọlụ mmiri na ọsọ igwe egwe bọọlụ nke 2000 r/min maka awa 24 iji nweta slurry silicon nano-scale. A na-ebufe slurry silicon enwetara na tankị mbufe mgbasa, a na-agbakwụnyekwa ihe ndị ahụ dịka oke oke silicon: graphite (emepụtara na Shanghai, ọkwa batrị): nanotubes carbon (emepụtara na Tianjin, ọkwa batrị): polyvinyl pyrrolidone ( emepụtara na Tianjin, ọkwa nyocha) = 40:60:1.5:2. A na-eji Isopropanol emezi ọdịnaya siri ike, a na-emekwa ọdịnaya siri ike ka ọ bụrụ 15%. A na-egweri na mgbasa na ọsọ mgbasa nke 3500 r/min maka awa 4. A na-atụnyere otu slurry ọzọ na-enweghị itinye CNT, ihe ndị ọzọ bụ otu ihe ahụ. A na-ebufe slurry a gbasasịrị agbasasị na tankị nri nkụcha mmiri, a na-emekwa nkụcha mmiri n'ime ikuku nwere nitrogen, ebe okpomọkụ mbata na ọpụpụ bụ 180 na 90 Celsius, n'otu n'otu. E mesịa, a tụnyere ụdị mkpuchi carbon abụọ, mkpuchi siri ike na mkpuchi mmiri mmiri. Usoro mkpuchi siri ike bụ: a na-agwakọta ntụ ntụ a kpọnwụrụ akpọnwụ na ntụ asfalt 20% (emere na Korea, D50 bụ 5 μm), gwakọta ya na igwekota igwe maka nkeji iri, ọsọ ngwakọta ahụ bụ 2000 r/min iji nweta ntụ ntụ a kpuchiri ekpuchi. Usoro mkpuchi mmiri mmiri bụ: a na-agbakwunye ntụ ntụ a kpọnwụrụ akpọnwụ na mmiri xylene (emere na Tianjin, ọkwa nyocha) nke nwere 20% asfalt agbazere na ntụ ahụ na ọdịnaya siri ike nke 55%, ma kpalie ya nke ọma. Mee achịcha n'ime oven vacuum na okpomọkụ 85℃ ruo awa anọ, tinye ya n'ime igwekota igwe maka ịgwakọta ya, ọsọ ngwakọta ahụ bụ 2000 r/min, oge ngwakọta ahụ bụ nkeji iri iji nweta ntụ ntụ a kpuchiri tupu oge eruo. N'ikpeazụ, a kpụchara ntụ ntụ a kpuchiri tupu oge eruo n'ime ọkụ na-agbanwe agbanwe n'okpuru ikuku nitrogen na ọnụego okpomọkụ nke 5°C/min. E buru ụzọ debe ya na okpomọkụ mgbe niile nke 550°C ruo awa abụọ, wee nọgide na-ekpo ọkụ ruo 800°C ma debe ya na okpomọkụ mgbe niile maka awa abụọ, wee jụọ oyi n'ụzọ ebumpụta ụwa ruo n'okpuru 100°C wee hapụ ya ka o nweta ihe mejupụtara silicon-carbon.
1.2 Ụzọ e si akọwapụta ihe
E jiri ihe nnwale nha ihe ndị ahụ (Mastersizer 2000 version, nke emere na UK) nyochaa nkesa nha ihe ndị ahụ. E jiri igwe nyocha elektrọn microscopy (Regulus8220, nke emere na Japan) nwalee ntụ ntụ ndị e nwetara na nzọụkwụ ọ bụla iji nyochaa ọdịdị na nha nke ntụ ntụ ndị ahụ. E jiri ihe nyocha diffraction ntụ ntụ X-ray (D8 ADVANCE, nke emere na Germany) nyochaa nhazi usoro nke ihe ahụ, e jirikwa ihe nyocha ike spectrum nyochaa ihe mejupụtara ihe ahụ. E jiri ihe mejupụtara silicon-carbon nke enwetara mee ọkara sel nke ihe nlereanya CR2032, yana oke oke nke silicon-carbon: SP: CNT: CMC: SBR bụ 92:2:2:1.5:2.5. Elektrọd counter bụ mpempe akwụkwọ lithium ígwè, elektrọd ahụ bụ elektrọl azụmaahịa (ihe nlereanya 1901, nke emere na Korea), a na-eji diaphragm Celgard 2320, oke voltaji chajị na mwepụta bụ 0.005-1.5 V, oge chajị na mwepụta bụ 0.1 C (1C = 1A), na oge a na-ewepụ mwepụta bụ 0.05 C.
Iji chọpụtakwuo arụmọrụ nke ihe mejupụtara silicon-carbon, e mere obere batrị dị nro nke e ji laminated mee 408595. E ji NCM811 (emere na Hunan, ọkwa batrị), a na-ejikwa ihe silicon-carbon 8% mee elektrọd graphite na-adịghị mma. Usoro slurry elektrọd dị mma bụ 96% NCM811, 1.2% polyvinylidene fluoride (PVDF), 2% ihe na-eduzi SP, 0.8% CNT, a na-ejikwa NMP dị ka ihe na-ekesa ihe; usoro slurry elektrọd na-adịghị mma bụ 96% ihe mejupụtara elektrọd na-adịghị mma, 1.3% CMC, 1.5% SBR 1.2% CNT, a na-ejikwa mmiri dị ka ihe na-ekesa ihe. Mgbe a gwachara ya, kpuchie ya, tụgharịa ya, bee ya, tinye ya n'ime ihe, ịgbado ọkụ, nkwakọ ngwaahịa, ime achịcha, ịgba mmiri mmiri, nhazi na nkewa ikike, e kwadebere obere batrị 408595 dị nro nke nwere ikike 3 Ah. A nwalere arụmọrụ ọnụego nke 0.2C, 0.5C, 1C, 2C na 3C yana arụmọrụ okirikiri nke chajị 0.5C na mwepụ 1C. Oke voltaji chajị na mwepụta bụ 2.8-4.2 V, chajị voltaji na-agbanwe agbanwe na chajị voltaji na-agbanwe agbanwe, na ọkụ eletrik na-akwụsị bụ 0.5C.
Nsonaazụ na Mkparịta ụka 2
A hụrụ ntụ silicon mbụ ahụ site na iji nyocha elektrọn microscopy (SEM). Ntụ silicon ahụ nwere obere ntụpọ na-adịghị mma, nha ihe na-erughị 2μm, dịka egosiri na Foto 1(a). Mgbe a gwechara bọọlụ, nha ntụ silicon ahụ belatara nke ukwuu ruo ihe dị ka 100 nm [Foto 1(b)]. Nnwale nha ihe ahụ gosiri na D50 nke ntụ silicon mgbe a gwechara bọọlụ bụ 110 nm na D90 bụ 175 nm. Nnyocha nke ọma nke ọdịdị ntụ silicon mgbe a gwechara bọọlụ na-egosi nhazi gbagọrọ agbagọ (a ga-enyocha nhazi nke ihe ahụ gbagọrọ agbagọ site na SEM nkebi cross-sectional ma emechaa). Ya mere, data D90 enwetara site na ule nha ihe ahụ kwesịrị ịbụ nha ogologo nke nanosheet. Tinyere nsonaazụ SEM, a pụrụ ikpebi na nha nke nanosheet enwetara pere mpe karịa uru dị mkpa nke 150 nm nke mgbawa ntụ silicon n'oge a na-achaji ma na-agbapụ na opekata mpe otu akụkụ. Mmalite nke ọdịdị nke ntụpọ ahụ bụ isi n'ihi ike dị iche iche nke kristal planes nke kristal silicon, nke otu n'ime ha bụ ike nke silicon planes nwere obere ike nke ntụpọ karịa kristal planes {100} na {110}. Ya mere, a na-eme ka kristal planes a dị mfe site na igwe bọọlụ, ma mechaa mepụta nhazi gbagọrọ agbagọ. Ọdịdị gbagọrọ agbagọ na-enyere aka n'ịchịkọta ihe owuwu ndị na-adịghị mma, na-echekwa oghere maka mgbasawanye olu nke silicon, ma na-eme ka ihe ahụ kwụsie ike.
A fesasịrị slurry nwere nano-silicon, CNT na graphite, a lekwara ntụ ahụ tupu na mgbe a gbasasịrị ya site na SEM. A na-egosi nsonaazụ ya na Foto 2. Matrix graphite agbakwunyere tupu ịgbasa ya bụ nhazi flake nkịtị nke nha ya bụ 5 ruo 20 μm [Foto 2(a)]. Nnwale nkesa nha nke graphite na-egosi na D50 bụ 15 μm. Ntụ ntụ e nwetara mgbe a gbasasịrị ya nwere ọdịdị okirikiri [Foto 2(b)], a pụkwara ịhụ na a na-ekpuchi graphite site na oyi akwa mkpuchi mgbe a gbasasịrị ya. D50 nke ntụ ntụ mgbe a gbasasịrị ya bụ 26.2 μm. SEM hụrụ njirimara ọdịdị nke ihe ndị ọzọ, na-egosi njirimara nke ihe owuwu oghere dị larịị nke nanomaterials chịkọtara [Foto 2(c)]. Nhazi oghere ahụ bụ nke silicon nanosheets na CNTs jikọtara ọnụ [Foto 2(d)], ebe nnwale ahụ kpọmkwem (BET) dị elu ruo 53.3 m2/g. Ya mere, mgbe a fesasịrị ya, mpempe akwụkwọ silicon nanosheets na CNT na-ezukọta onwe ha iji mepụta nhazi oghere.
E jiri mkpuchi carbon mmiri gwọọ oyi akwa oghere ahụ, mgbe e tinyekwara pitch precursor mkpuchi carbon na carbonization, e mere nchọpụta SEM. E gosiri nsonaazụ ya na Foto 3. Mgbe e tinyere mkpuchi carbon tupu oge eruo, elu nke ihe ndị ọzọ na-adị ire ụtọ, na-enwe oyi akwa mkpuchi doro anya, mkpuchi ahụ emechaala, dịka egosiri na Foto 3(a) na (b). Mgbe carbonization gasịrị, oyi akwa mkpuchi elu na-anọgide na-enwe ọnọdụ mkpuchi dị mma [Foto 3(c)]. Na mgbakwunye, onyonyo SEM nke akụkụ obe na-egosi nanoparticles dị ka eriri [Foto 3(d)], nke kwekọrọ na njirimara ọdịdị nke nanosheets, na-akwadokwa nhazi nke nanosheets silicon mgbe e gweri bọọlụ. Na mgbakwunye, Foto 3(d) na-egosi na enwere ihe ndị na-ejupụta n'etiti ụfọdụ nanosheets. Nke a bụ isi n'ihi ojiji nke usoro mkpuchi mmiri mmiri. Ngwọta asphalt ga-abanye n'ime ihe ahụ, ka elu nke nanosheets silicon dị n'ime wee nweta oyi akwa nchebe mkpuchi carbon. Ya mere, site na iji mkpuchi mmiri mmiri, na mgbakwunye na inweta mmetụta mkpuchi nke abụọ, enwere ike nweta mmetụta mkpuchi carbon okpukpu abụọ nke mkpuchi nke mbụ. BET nwalere ntụ ntụ carbonized, nsonaazụ nnwale ahụ bụ 22.3 m2/g.
E tinyere ntụ ntụ carbonized ahụ n'ime nyocha ike nke akụkụ dị iche iche (EDS), a na-egosikwa nsonaazụ ya na Foto 4(a). Isi nke nha micron bụ akụkụ C, nke kwekọrọ na matrix graphite, mkpuchi mpụta ahụ nwekwara silicon na oxygen. Iji nyochaa usoro silicon ọzọ, emere nnwale X-ray diffraction (XRD), a na-egosikwa nsonaazụ ya na Foto 4(b). Ihe mejupụtara ihe ahụ bụ graphite na silikọn otu kristal, na-enweghị njirimara silicon oxide doro anya, nke na-egosi na akụkụ oxygen nke ule ike sitere na oxidation eke nke elu silikọn. A na-edekọ ihe mejupụtara silikọn-carbon dị ka S1.
E tinyere ihe silicon-carbon S1 e kwadebere n'imepụta ọkara sel nke ụdị bọtịnụ na ule mwepụ chajị. E gosiri usoro mwepụ chajị mbụ na Foto 5. Ike pụrụ iche a na-agbanwe agbanwe bụ 1000.8 mAh/g, arụmọrụ okirikiri mbụ dịkwa elu ruo 93.9%, nke dị elu karịa arụmọrụ mbụ nke ọtụtụ ihe ndị dabere na silicon na-enweghị pre-litiation akọwara na akwụkwọ. Ọrụ mbụ dị elu na-egosi na ihe mejupụtara silicon-carbon a kwadebere nwere nkwụsi ike dị elu. Iji chọpụta mmetụta nke nhazi oghere, netwọk na-eduzi na mkpuchi carbon na nkwụsi ike nke ihe silicon-carbon, e kwadebere ụdị ihe silicon-carbon abụọ na-agbakwunyeghị CNT na enweghị mkpuchi carbon mbụ.
E gosiri ụdị ntụ ntụ carbonized nke ihe mejupụtara silicon-carbon na-enweghị itinye CNT na Foto nke 6. Mgbe mkpuchi mmiri mmiri na carbonization gasịrị, a pụrụ ịhụ oyi akwa mkpuchi nke ọma n'elu ihe ndị ọzọ dị na Foto nke 6(a). E gosiri SEM nke ihe mejupụtara carbonized na Foto nke 6(b). Nchikota nke nanosheets silicon nwere njirimara oghere, ule BET bụkwa 16.6 m2/g. Agbanyeghị, ma e jiri ya tụnyere ikpe ahụ na CNT [dịka egosiri na Foto nke 3(d), ule BET nke ntụ ntụ carbonized ya bụ 22.3 m2/g], njupụta nano-silicon dị n'ime dị elu, na-egosi na mgbakwunye nke CNT nwere ike ịkwalite nhazi oghere. Na mgbakwunye, ihe ahụ enweghị netwọk conductive atọ nke CNT wuru. A na-edekọ ihe mejupụtara silicon-carbon dị ka S2.
E gosiri njirimara ọdịdị nke ihe mejupụtara silicon-carbon nke mkpuchi carbon siri ike kwadebere na Foto 7. Mgbe carbonization gasịrị, enwere oyi akwa mkpuchi doro anya n'elu, dịka egosiri na Foto 7(a). Foto 7(b) na-egosi na enwere nanoparticles dị ka mpempe akwụkwọ na ngalaba obe, nke kwekọrọ na njirimara ọdịdị nke nanosheets. Nchịkọta nke nanosheets na-emepụta nhazi oghere. Enweghị ihe nzacha doro anya n'elu nanosheets dị n'ime, na-egosi na mkpuchi carbon siri ike na-emepụta naanị oyi akwa mkpuchi carbon nwere nhazi oghere, enweghịkwa oyi akwa mkpuchi dị n'ime maka nanosheets silicon. A na-edekọ ihe mejupụtara silicon-carbon a dị ka S3.
E mere nnwale chajị na mwepụ nke ụdị bọtịnụ na S2 na S3. Ike kpọmkwem na arụmọrụ mbụ nke S2 bụ 1120.2 mAh/g na 84.8%, n'otu n'otu, ikike kpọmkwem na arụmọrụ mbụ nke S3 bụ 882.5 mAh/g na 82.9%, n'otu n'otu. Ike kpọmkwem na arụmọrụ mbụ nke ihe nlele S3 a kpuchiri siri ike bụ nke kacha ala, na-egosi na naanị mkpuchi carbon nke usoro oghere ka emere, a meghịkwa mkpuchi carbon nke nanosheets silicon dị n'ime, nke enweghị ike inye ikike zuru oke nke ihe dabere na silicon ma enweghị ike ichebe elu nke ihe dabere na silicon. Ọrụ mbụ nke ihe nlele S2 na-enweghị CNT dịkwa ala karịa nke ihe mejupụtara silicon-carbon nwere CNT, na-egosi na dabere na oyi akwa mkpuchi dị mma, netwọk na-eduzi na ọkwa dị elu nke usoro oghere na-enyere aka imeziwanye arụmọrụ chajị na mwepụ nke ihe silicon-carbon.
E jiri ihe S1 silicon-carbon mee obere batrị zuru oke iji lelee arụmọrụ ọnụego na arụmọrụ okirikiri. E gosiri usoro ọnụego mwepụta na Foto 8(a). Ike mwepụta 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 mwepụta 1C dị elu ruo 98.3%, mana ọnụego mwepụta 2C na-agbada ruo 73.3%, ọnụego mwepụta 3C na-agbadakwa ruo 34.4%. Iji sonye na otu mgbanwe elektrọd silicon na-adịghị mma, biko tinye WeChat: shimobang. N'ihe gbasara ọnụego chaja, ikike chaja 0.2C, 0.5C, 1C, 2C na 3C bụ 3.186, 3.182, 3.081, 2.686 na 2.289 Ah, n'otu n'otu. Oke chaja 1C bụ 96.7%, oke chaja 2C ka ruru 84.3%. Agbanyeghị, n'ileba anya na usoro chaja dị na Foto 8(b), ikpo okwu chaja 2C buru ibu karịa ikpo okwu chaja 1C, ikike chaja voltaji ya na-adịgide adịgide na-abụkarị ihe kacha (55%), nke na-egosi na polarization nke batrị chaja 2C dịlarị nnukwu ibu. Ihe silicon-carbon nwere ezigbo arụmọrụ chaja na mwepụta na 1C, mana ọ dị mkpa ka emelite njirimara nhazi nke ihe ahụ iji nweta arụmọrụ dị elu. Dịka egosiri na Foto 9, mgbe okirikiri 450 gasịrị, ọnụego njigide ikike bụ 78%, na-egosi arụmọrụ okirikiri dị mma.
SEM nyochachara ọnọdụ elu nke elektrọd tupu na mgbe okirikiri ahụ gasịrị, a na-egosikwa nsonaazụ ya na Foto 10. Tupu okirikiri ahụ, elu nke ihe graphite na silicon-carbon doro anya [Foto 10(a)]; mgbe okirikiri ahụ gasịrị, a na-emepụta oyi akwa mkpuchi n'elu [Foto 10(b)], nke bụ ihe nkiri SEI dị oke. Ọdịdị siri ike nke ihe nkiri SEI. Oriri lithium na-arụ ọrụ dị elu, nke na-adịghị mma maka arụmọrụ okirikiri ahụ. Ya mere, ịkwalite nhazi nke ihe nkiri SEI dị nro (dịka owuwu ihe nkiri SEI arụrụ arụ, itinye ihe mgbakwunye electrolyte kwesịrị ekwesị, wdg) nwere ike imeziwanye arụmọrụ okirikiri ahụ. Nleba anya SEM nke akụkụ nke ihe silicon-carbon mgbe okirikiri ahụ gasịrị [Foto 10(c)] na-egosi na obere ihe silicon mbụ dị ka eriri aghọọla nke siri ike ma ewepụla nhazi oghere ahụ kpamkpam. Nke a bụ isi n'ihi mmụba olu na-aga n'ihu na mkpụkọ nke ihe silicon-carbon n'oge okirikiri ahụ. Ya mere, ọ dị mkpa ka emelite nhazi oghere ahụ iji nye oghere nchekwa zuru oke maka mgbasawanye olu nke ihe dabere na silicon.
Mmechi 3
Dabere na mgbasawanye olu, enweghị ike ịchịkwa ihe na enweghị njikọ zuru oke nke ihe electrode na-adịghị mma dabere na silicon, akwụkwọ a na-eme mmezi ebumnuche, site na nhazi nke silicon nanosheets, owuwu usoro oghere, owuwu netwọk na-eduzi ihe na mkpuchi carbon zuru oke nke ihe ndị ọzọ niile, iji melite nkwụsi ike nke ihe electrode na-adịghị mma dabere na silicon n'ozuzu ya. Nchịkọta nke silicon nanosheets nwere ike ịmepụta usoro oghere. Ntinye nke CNT ga-akwalite nhazi oghere ọzọ. Ihe mejupụtara silicon-carbon nke mkpuchi mmiri mmiri kwadebere nwere mmetụta mkpuchi carbon okpukpu abụọ karịa nke mkpuchi usoro siri ike kwadebere, ma gosipụta ikike pụrụ iche dị elu na arụmọrụ mbụ. Na mgbakwunye, arụmọrụ mbụ nke ihe mejupụtara silicon-carbon nwere CNT dị elu karịa nke na-enweghị CNT, nke bụ isi n'ihi oke ikike nke ihe owuwu oghere iji belata mgbasawanye olu nke ihe dabere na silicon. Ntinye nke CNT ga-ewu netwọk na-eduzi ihe atọ, melite njikwa nke ihe dabere na silicon, ma gosipụta arụmọrụ ọnụego dị mma na 1C; ihe ahụ na-egosikwa arụmọrụ okirikiri dị mma. Agbanyeghị, ọ dị mkpa ka e mee ka usoro oghere dị n'ime ihe ahụ sie ike iji nye ohere nchekwa zuru oke maka mgbasawanye olu nke silicon, ma kwalite nhazi nke ihe dị nrona ihe nkiri SEI dị oke ọnụ iji melite arụmọrụ okirikiri nke ihe mejupụtara silicon-carbon.
Anyị na-enyekwa ngwaahịa graphite na silicon carbide dị ọcha nke ukwuu, nke a na-ejikarị eme ihe n'ịhazi wafer dị ka oxidation, diffusion, 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 ozi: Nọvemba-13-2024