Ƙirƙira da kera batirin lithium ion tsari ne mai haɗe-haɗe da matakin fasaha ɗaya. Gabaɗaya, samar da batirin lithium ya haɗa da tsarin kera na’urar lantarki, tsarin haɗa baturi da allurar ruwa ta ƙarshe, precharge, samuwar da tsarin tsufa. A cikin waɗannan matakai guda uku na tsari, kowane tsari za a iya raba shi zuwa matakai masu mahimmanci, kowane mataki zai yi tasiri sosai akan aikin ƙarshe na baturi.

A cikin mataki na tsari, ana iya raba shi zuwa matakai biyar: shirye-shiryen manna, suturar manna, abin nadi, yankan da bushewa. A cikin tsarin hada baturi, kuma bisa ga ƙayyadaddun baturi da samfura daban-daban, an raba kusan zuwa iska, harsashi, walda da sauran matakai. A mataki na ƙarshe na allurar ruwa, gami da allurar ruwa, shaye-shaye, rufewa, prefilling, samuwar, tsufa da sauran matakai. Tsarin kera na’urar lantarki shine ainihin abun ciki na gabaɗayan masana’antar batirin lithium, wanda ke da alaƙa da aikin sinadarai na baturi, kuma ingancin slurry yana da mahimmanci musamman.

Ɗaya, ainihin ka’idar slurry

Lithium ion baturi slurry wani nau’i ne na ruwa, yawanci ana iya raba shi zuwa ruwan Newtonian da ruwan da ba na Newtonian ba. Daga cikin su, ruwan da ba na Newtonian ba za a iya raba shi zuwa ruwan filastik dilatancy, ruwan da ba na Newtonian mai dogaro da lokaci ba, ruwan pseudoplastic da ruwan roba na bingham. Ruwan Newtonian ruwa ne mai ƙarancin danko wanda ke da sauƙin lalacewa a ƙarƙashin damuwa kuma damuwa mai ƙarfi ya yi daidai da ƙimar nakasar. Ruwa a cikin abin da damuwa mai tsauri a kowane lokaci shine aikin layi na adadin nakasar shear. Yawancin ruwaye a yanayi sune ruwan Newtonian. Yawancin ruwa mai tsafta kamar ruwa da barasa, mai haske, mafi ƙarancin ƙwayoyin ƙwayoyin ƙwayoyin cuta da ƙananan iskar gas masu gudana sune ruwan Newton.

Ruwan da ba na newtonian ba yana nufin ruwan da bai gamsar da ka’idar gwaji ta Newton na danko ba, wato, alakar da ke tsakanin danniya da juzu’i ba ta layi ba ce. Ruwan da ba na newtonian ana samun su sosai a rayuwa, samarwa da yanayi. Abubuwan da aka tattara na polymers da kuma dakatarwar na polymers gabaɗaya ruwan ruwan Newton ne. Yawancin ruwayen halittu yanzu an bayyana su azaman ruwan da ba na Newtonian ba. Ruwan da ba na newtonian ba sun haɗa da jini, lymph, da ruwaye na cystic, da kuma “rauni-ruwa” kamar cytoplasm.

Electrode slurry ya ƙunshi nau’ikan albarkatun ƙasa daban-daban tare da ƙayyadaddun nauyi da girman ƙwayar cuta, kuma yana gauraye da warwatse a cikin lokaci mai ƙarfi. slurry da aka kafa shine ruwan da ba na Newton ba. Lithium baturi slurry za a iya raba tabbatacce slurry da korau slurry iri biyu, saboda slurry tsarin (mai, ruwa) daban-daban, yanayinsa zai bambanta. Koyaya, ana iya amfani da sigogi masu zuwa don tantance kaddarorin slurry:

1. Dankowar slurry

Dankowa ma’auni ne na dankowar ruwa da kuma bayyana karfin ruwa akan al’amarin gogayya na ciki. Lokacin da ruwa ke gudana, yana haifar da rikice-rikice na ciki tsakanin kwayoyin halittarsa, wanda ake kira dankowar ruwa. Danko yana bayyana ta danko, wanda ake amfani dashi don siffanta yanayin juriya da ke da alaƙa da kaddarorin ruwa. Danko ya kasu kashi-kashi mai kuzari da dankowar yanayi.

Viscosity is defined as A pair of parallel plates, area A, Dr Apart, filled with A liquid. Now apply a thrust F to the upper plate to produce a velocity change DU. Because the viscosity of the liquid transfers this force layer by layer, each layer of liquid also moves accordingly, forming a velocity gradient du/ Dr, called shear rate, represented by R ‘. F/A is called shear stress, expressed as τ. The relationship between shear rate and shear stress is as follows:

(F/A) = eta (du/Dr)

Ruwan Newtonian ya dace da dabarar Newton, danko yana da alaƙa da zafin jiki kawai, ba ƙimar ƙarfi ba, τ yayi daidai da D.

Ruwan da ba na newtonian ba ba sa yin daidai da tsarin Newton τ/D=f(D). Dankowar da aka bayar a τ/D shine ηa, wanda ake kira danko na fili. Dankowar ruwan da ba na Newtonian ba ya dogara ba kawai akan zafin jiki ba, har ma akan ƙimar juzu’i, lokaci, da ɓarkewar ƙarfi ko kauri.

2. Slurry Properties

Slurry wani ruwa ne wanda ba na Newtonian ba, wanda shine gauraya mai kauri. Domin saduwa da buƙatun na gaba shafi tsari, slurry bukatar da wadannan uku halaye:

① Kyakkyawan ruwa. Ana iya lura da ruwa ta hanyar tayar da slurry da kyale shi ya gudana ta dabi’a. Kyakkyawan ci gaba, ci gaba da kashewa da kashewa yana nufin ingantaccen ruwa. Ruwan ruwa yana da alaƙa da ƙaƙƙarfan abun ciki da danƙon slurry,

(2) leveling. The smoothness of the slurry affects the flatness and evenness of the coating.

③ Rheology. Rheology yana nufin lalata halaye na slurry a cikin kwarara, da kaddarorin suna shafar ingancin sandar takarda.

3. Slurry watsawa tushe

Lithium ion baturi lantarki masana’antu, cathode manna ta m, conductive wakili, cathode abu abun da ke ciki; Mummunan manna ya ƙunshi m, graphite foda da sauransu. Shirye-shiryen slurry mai kyau da mara kyau ya haɗa da jerin matakai na fasaha, irin su haɗuwa, narkewa da rarrabawa tsakanin ruwa da ruwa, ruwa da kayan aiki mai ƙarfi, kuma yana tare da canje-canje a cikin zafin jiki, danko da yanayi a cikin wannan tsari. A hadawa da watsawa tsari na lithium ion baturi slurry za a iya raba zuwa Macro hadawa tsari da micro watsawa tsari, wanda ko da yaushe suna tare da dukan aiwatar da lithium ion baturi slurry shiri. Shiri na slurry gabaɗaya yana wucewa ta matakai masu zuwa:

① Dry foda hadawa. Barbashi suna tuntuɓar juna ta hanyar dige-dige, ɗigo, jirage, da layi,

② Matakin durkushewar laka mai bushewa. A wannan mataki, bayan busasshen foda ya haɗu daidai, ana ƙara ruwa mai ɗaure ko sauran ƙarfi, kuma danyen kayan ya zama rigar da laka. Bayan daɗaɗɗa mai ƙarfi na mahautsini, kayan yana jujjuyawa da juzu’i da juzu’i na ƙarfin injin, kuma za a sami juzu’i na ciki tsakanin sassan. Ƙarƙashin kowane ƙarfi, ɓangarorin albarkatun ƙasa sun kasance suna tarwatse sosai. Wannan mataki yana da tasiri mai mahimmanci akan girman da danko na ƙãre slurry.

③ Dilution da watsawa mataki. Bayan kunnuwa, an ƙara sauran ƙarfi a hankali don daidaita slurry danko da ingantaccen abun ciki. A wannan mataki, tarwatsawa da agglomeration suna rayuwa tare, kuma a ƙarshe sun kai ga kwanciyar hankali. A wannan mataki, tarwatsa kayan ya fi shafa ta hanyar injin injiniya, juriya na juriya tsakanin foda da ruwa, ƙarfin watsawa mai sauri mai sauri, da tasirin hulɗar tsakanin slurry da bangon ganga.

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Binciken sigogi da ke shafar kaddarorin slurry

Yana da mahimman bayanai don tabbatar da daidaiton baturi a cikin tsarin samar da baturi cewa slurry ya kamata ya sami kwanciyar hankali. Tare da ƙarshen slurry da aka haɗa, haɗuwa yana tsayawa, slurry zai bayyana daidaitawa, flocculation da sauran abubuwan mamaki, wanda zai haifar da manyan ƙwayoyin cuta, wanda zai sami tasiri mafi girma a kan shafi na gaba da sauran matakai. Babban sigogi na kwanciyar hankali slurry shine ruwa, danko, m abun ciki da yawa.

1. Dankowar slurry

A barga da kuma dace danko na lantarki manna yana da matukar muhimmanci ga shafi aiwatar da lantarki takardar. Danko yana da yawa ko ƙananan ba ya dace da shafi na yanki na iyakacin duniya, slurry tare da babban danko ba shi da sauƙi don haɓakawa kuma watsawa zai zama mafi kyau, amma babban danko ba shi da kyau ga sakamako mai daidaitawa, ba ya dace da shafi; Danko ma low ba kyau, danko ne low, ko da yake slurry kwarara ne mai kyau, amma yana da wuya a bushe, rage bushewa yadda ya dace da shafi, shafi fatattaka, slurry barbashi agglomeration, surface yawa daidaito ba shi da kyau.

Matsalar da ke faruwa sau da yawa a cikin tsarin samar da mu shine canjin danko, kuma “canji” a nan za a iya raba shi zuwa canji na gaggawa da canji na tsaye. Canjin wucin gadi yana nufin babban canji a cikin tsarin gwaji na danko, kuma canji a tsaye yana nufin canjin danko bayan wani lokaci. Danko ya bambanta daga babba zuwa ƙasa, daga babba zuwa ƙasa. Gabaɗaya magana, manyan abubuwan da ke shafar slurry danko su ne saurin haɗuwa da slurry, sarrafa lokaci, tsarin sinadaran, yanayin yanayin yanayi da zafi, da sauransu. Dankin slurry da gaske yana ƙaddara ta mai ɗaure. Ka yi tunanin cewa ba tare da mai ɗaure PVDF/CMC/SBR (FIG. 2, 3), ko kuma idan mai ɗaure ba ya haɗa al’amuran rayuwa da kyau, za su kasance da ƙarfi mai rai da wakili mai ɗaukar hoto ya samar da ruwan da ba Newtonian ba tare da suturar uniform? Kar a yi! Saboda haka, don nazarin da kuma warware dalilin slurry danko canji, ya kamata mu fara daga yanayin dauri da slurry watsawa digiri.

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FIG. 2. Molecular structure of PVDF

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Hoto 3. Tsarin kwayoyin halitta na CMC

(1) danko yana karuwa

Tsarin slurry daban-daban suna da ƙa’idodin canza danko daban-daban. A halin yanzu, babban tsarin slurry shine ingantaccen tsarin mai PVDF/NMP, kuma slurry mara kyau shine graphite /CMC/SBR tsarin ruwa.

① Danko na tabbatacce slurry yana ƙaruwa bayan wani lokaci. Ɗaya daga cikin dalili (jeri na ɗan gajeren lokaci) shine saurin haɗuwa da slurry yana da sauri, mai ɗaure ba a narkar da shi ba, kuma foda na PVDF yana narkar da shi bayan wani lokaci, kuma danko yana ƙaruwa. Gabaɗaya magana, PVDF yana buƙatar aƙalla sa’o’i 3 don narkar da shi gabaɗaya, komai saurin saurin motsawar ba zai iya canza wannan abin da ke tasiri ba, abin da ake kira “gaggauce yana yin ɓarna”. Dalili na biyu (tsawon lokaci) shi ne cewa a cikin tsari na slurry tsaye, colloid yana canzawa daga yanayin sol zuwa yanayin gel. A wannan lokacin, idan an daidaita shi a cikin saurin jinkirin, ana iya dawo da danko. Dalili na uku shi ne cewa an samar da tsari na musamman tsakanin colloid da abu mai rai da barbashi na wakili. Wannan yanayin ba zai iya jurewa ba, kuma slurry danko ba za a iya dawo da shi ba bayan karuwa.

Danko na mummunan slurry yana ƙaruwa. A danko na korau slurry ne yafi lalacewa ta hanyar halakar da kwayoyin tsarin na dauri, da kuma danko na slurry ya karu bayan hadawan abu da iskar shaka na kwayoyin sarkar karaya. Idan abu ya tarwatse sosai, za a rage girman barbashi sosai, kuma za a ƙara danko na slurry.

(2) an rage danko

① Dankowar tabbataccen slurry yana raguwa. Daya daga cikin dalilan, m colloid canje-canje a cikin hali. Akwai dalilai da yawa don canjin, irin su ƙarfi mai ƙarfi yayin canja wurin slurry, canjin ingancin ruwa ta hanyar ɗaure, canjin tsari da lalata kanta a cikin aiwatar da hadawa. Dalili na biyu shi ne cewa rashin daidaituwa da motsawa da tarwatsewa yana kaiwa ga babban yanki na yanki mai ƙarfi a cikin slurry. Dalili na uku shi ne cewa a cikin aikin motsa jiki, manne yana fuskantar karfi mai karfi da kuma juzu’i na kayan aiki da kayan rayuwa, da canje-canje a cikin kaddarorin a yanayin zafi mai zafi, yana haifar da raguwa a cikin danko.

Danko na mummunan slurry yana raguwa. Ɗaya daga cikin dalilan shi ne cewa akwai ƙazanta masu gauraye a cikin CMC. Yawancin ƙazanta a cikin CMC ba za su iya narkewa ba. Lokacin da CMC ba ta da kyau tare da calcium da magnesium, za a rage danko. Dalili na biyu shine sodium hydroxymethyl cellulose, wanda shine yawancin haɗin C/O. Ƙarfin haɗin gwiwa yana da rauni sosai kuma cikin sauƙin lalacewa ta hanyar ƙarfi. Lokacin da saurin motsawa yayi sauri ko lokacin motsawa yayi tsayi da yawa, ana iya lalata tsarin CMC. CMC yana taka rawa mai kauri da daidaitawa a cikin mummunan slurry, kuma yana taka muhimmiyar rawa a cikin tarwatsa albarkatun kasa. Da zarar tsarinsa ya lalace, babu makawa zai haifar da slurry sulhu da rage danko. Dalili na uku shine lalata SBR daure. A cikin ainihin samarwa, CMC da SBR galibi ana zaɓar su yi aiki tare, kuma ayyukansu sun bambanta. SBR galibi yana taka rawar ɗaure, amma yana da saurin lalatawa a ƙarƙashin dogon lokaci yana motsawa, yana haifar da gazawar haɗin gwiwa da raguwar danko na slurry.

(3) yanayi na musamman (jelly-dimbin yawa na lokaci babba da ƙasa)

A cikin aiwatar da shirya manna mai kyau, manna wani lokaci ya juya zuwa jelly. Akwai manyan dalilai guda biyu na wannan: na farko, ruwa. Idan aka yi la’akari da cewa danshi na abubuwa masu rai da kuma kula da danshi a cikin tsarin hadawa ba su da kyau, damun danshi na albarkatun kasa ko yanayin yanayin haɗuwa yana da yawa, yana haifar da shayar da ruwa ta hanyar PVDF a cikin jelly. Na biyu, ƙimar pH na slurry ko abu. Mafi girman ƙimar pH shine, kula da danshi ya fi tsauri, musamman haɗuwa da manyan kayan nickel kamar NCA da NCM811.

A danko na slurry fluctutes, daya daga cikin dalilan iya zama cewa slurry ba gaba daya stabilized a cikin gwaji tsari, da danko na slurry ne ƙwarai rinjayar da zazzabi. Musamman bayan tarwatsawa a cikin babban gudun, akwai wani yanayin zafin jiki a cikin zafin jiki na ciki na slurry, kuma danko na samfurori daban-daban ba iri ɗaya ba ne. Dalili na biyu shi ne matalauta watsawa na slurry, live abu, dauri, conductive wakili ba mai kyau watsawa, slurry ba mai kyau fluidity, na halitta slurry danko ne high ko low.

2. Girman slurry

Bayan an haɗa slurry ɗin, dole ne a auna girman ƙwayarsa, kuma hanyar ma’aunin girman barbashi yawanci hanya ce ta scraper. Girman barbashi muhimmin siga ne don siffanta ingancin slurry. Girman barbashi yana da tasiri mai mahimmanci akan tsarin shafi, tsarin mirgina da aikin baturi. A ka’ida, ƙarami girman slurry shine, mafi kyau. Lokacin da barbashi size ne ma girma, da kwanciyar hankali na slurry za a shafa, sedimentation, slurry daidaito ne matalauta. A cikin aiwatar da murfin extrusion, za a sami kayan toshewa, sandar sanda ta bushe bayan rami, yana haifar da matsalolin ingancin sandar sanda. A cikin tsarin mirgina mai zuwa, saboda rashin daidaituwa a cikin yanki mara kyau, yana da sauƙi don haifar da fashewar sandar sanda da ƙananan ƙananan ƙwayoyin cuta, wanda zai haifar da babbar illa ga aikin hawan keke, aikin rabo da aminci na baturi.

M da korau aiki abubuwa, adhesives, conductive jamiái da sauran manyan kayan da daban-daban barbashi masu girma dabam da kuma yawa. A cikin aiwatar da motsawa, za a sami hadawa, extrusion, gogayya, agglomeration da sauran hanyoyin sadarwa daban-daban. A cikin matakai na albarkatun kasa da ake haɗewa a hankali, wetted da sauran ƙarfi, babban abu karya da hankali a hankali ga kwanciyar hankali, za a yi m abu hadawa, matalauta m narkewa, tsanani agglomeration na lafiya barbashi, canje-canje a m Properties da sauran yanayi, wanda zai kai ga ƙarni na manyan barbashi.

Da zarar mun fahimci abin da ke sa barbashi ya bayyana, muna buƙatar magance waɗannan matsalolin tare da magungunan da suka dace. Amma ga busassun foda hadawa da kayan, Ni da kaina zaton cewa mahautsini gudun yana da kadan tasiri a kan mataki na bushe foda hadawa, amma suna bukatar isasshen lokaci don tabbatar da uniformity na bushe foda hadawa. Yanzu wasu masana’antun zabi powdery m da wasu zabi ruwa bayani mai kyau m, biyu daban-daban adhesives ƙayyade daban-daban tsari, da yin amfani da powdery m bukatar dogon lokaci zuwa narke, in ba haka ba a cikin marigayi zai bayyana kumburi, rebound, danko canji, da dai sauransu. agglomeration tsakanin lafiya barbashi ne makawa, amma ya kamata mu tabbatar da cewa akwai isasshen gogayya tsakanin kayan taimaka da agglomeration barbashi bayyana extrusion, murkushe, conducive zuwa hadawa. Wannan yana buƙatar mu sarrafa m abun ciki a daban-daban matakai na slurry, ma low m abun ciki zai shafi gogayya watsawa tsakanin barbashi.

3. M abun ciki na slurry

M abun ciki na slurry yana da alaƙa da kwanciyar hankali na slurry, tsari guda ɗaya da dabara, mafi girma mafi girma da ingantaccen abun ciki na slurry, mafi girman danko, kuma akasin haka. A cikin wani kewayon, mafi girma da danko, mafi girma da kwanciyar hankali na slurry. Lokacin da muka zayyana baturin, gabaɗaya muna cire kauri daga core-core daga ƙarfin baturin zuwa ƙirar takardar lantarki, don haka ƙirar takardar lantarki yana da alaƙa kawai da ƙarancin ƙasa, yawan abubuwan rayuwa, kauri. da sauran sigogi. Ana daidaita sigogi na takardar lantarki ta hanyar coater da abin nadi, kuma ingantaccen abun ciki na slurry ba shi da wani tasiri kai tsaye akan sa. Don haka, shin matakin ƙaƙƙarfan abun ciki na slurry ya yi kadan?

(1) Solid content has a certain influence on improving the stirring efficiency and coating efficiency. The higher the solid content, the shorter the stirring time, the less solvent consumption, the higher the coating drying efficiency, saving time.

(2) M abun ciki yana da wasu bukatu don kayan aiki. Slurry tare da babban abun ciki mai mahimmanci yana da hasara mafi girma ga kayan aiki, saboda mafi girma da ingantaccen abun ciki, mafi mahimmancin kayan aiki.

(3) A slurry tare da babban m abun ciki ne mafi barga. Sakamakon gwajin kwanciyar hankali na wasu slurry (kamar yadda aka nuna a cikin hoton da ke ƙasa) ya nuna cewa TSI (ƙaddamar da rashin zaman lafiya) na 1.05 a cikin motsi na al’ada ya fi na 0.75 a cikin tsari mai zurfi mai zurfi, don haka kwanciyar hankali da aka samu ta hanyar babban danko. stirring tsari ne mafi alhẽri daga samu ta al’ada stirring tsari. Amma slurry tare da babban abun ciki mai mahimmanci kuma zai shafi tasirin sa, wanda yake da ƙalubale ga kayan aiki da masu fasaha na tsarin sutura.

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(4) slurry tare da babban abun ciki mai ƙarfi na iya rage kauri tsakanin sutura kuma rage juriya na ciki na baturi.

4. Yawan ɓangaren litattafan almara

Girman girman girman shine muhimmin ma’auni don nuna daidaiton girman. Ana iya tabbatar da tasirin tarwatsa girman ta hanyar gwada girman girman a wurare daban-daban. A cikin wannan ba za a sake maimaitawa ba, ta hanyar taƙaitaccen bayanin da ke sama, na yi imani cewa mun shirya manna mai kyau na lantarki.