A matsayin babban mai ɗaure kayan wuta mara kyau na tushen ruwa, samfuran CMC suna amfani da yawa ta masana'antun batir na gida da na waje. Mafi kyawun adadin mai ɗaure zai iya samun ƙarancin ƙarfin baturi, tsawon rayuwar zagayowar da ƙarancin juriya na ciki.
Binder yana ɗaya daga cikin mahimman kayan aikin taimako a cikin batir lithium-ion. Ita ce babban tushen kayan aikin injin gabaɗayan lantarki kuma yana da tasiri mai mahimmanci akan tsarin samar da lantarki da aikin lantarki na baturi. Ita kanta mai ɗaure ba ta da ƙarfi kuma tana ƙunshe da ƙaramin rabo a cikin baturi.
Bugu da ƙari ga abubuwan ɗorawa na gama-gari, kayan ɗaurin baturi na lithium-ion suma suna buƙatar iya jure kumburi da lalata na'urar, da kuma jure lalatawar electrochemical yayin caji da fitarwa. Ya kasance barga a cikin kewayon ƙarfin lantarki mai aiki, don haka babu kayan polymer da yawa waɗanda za a iya amfani da su azaman masu ɗaure na lantarki don batir lithium-ion.
Akwai manyan nau'ikan nau'ikan batirin lithium-ion guda uku waɗanda ake amfani da su sosai a halin yanzu: polyvinylidene fluoride (PVDF), styrene-butadiene roba (SBR) emulsion da carboxymethyl cellulose (CMC). Bugu da ƙari, polyacrylic acid (PAA), masu haɗin ruwa na tushen ruwa tare da polyacrylonitrile (PAN) da polyacrylate a matsayin manyan abubuwan haɗin gwiwa kuma sun mamaye wani kasuwa.
Halaye huɗu na matakin baturi CMC
Saboda rashin ruwa mai narkewa na tsarin acid na carboxymethyl cellulose, don yin amfani da shi mafi kyau, CMC abu ne da ake amfani da shi sosai wajen samar da baturi.
A matsayin babban mai ɗaure kayan wuta mara kyau na tushen ruwa, samfuran CMC suna amfani da yawa ta masana'antun batir na gida da na waje. Mafi kyawun adadin mai ɗaure zai iya samun ƙarancin ƙarfin baturi, tsawon rayuwar zagayowar da ƙarancin juriya na ciki.
Siffofin CMC guda huɗu sune:
Na farko, CMC na iya yin samfurin hydrophilic da mai narkewa, gaba ɗaya mai narkewa cikin ruwa, ba tare da zaruruwa da ƙazanta ba.
Na biyu, matakin maye gurbin shi ne uniform kuma danko yana da karko, wanda zai iya samar da kwanciyar hankali da mannewa.
Na uku, samar da samfurori masu tsafta tare da ƙarancin abun ciki na ƙarfe.
Na hudu, samfurin yana da dacewa mai kyau tare da SBR latex da sauran kayan.
CMC sodium carboxymethyl cellulose da aka yi amfani da shi a cikin baturi ya inganta ingantaccen amfani da shi, kuma a lokaci guda yana ba shi kyakkyawan aikin amfani, tare da tasirin amfani na yanzu.
Matsayin CMC a cikin batura
CMC wani carboxymethylated wanda aka samu daga cellulose, wanda yawanci ana shirya shi ta hanyar amsa cellulose na halitta tare da caustic alkali da monochloroacetic acid, kuma nauyin kwayoyin sa ya bambanta daga dubban zuwa miliyoyin.
CMC fari ne zuwa haske rawaya foda, granular ko fibrous abu, wanda yana da karfi hygroscopicity kuma yana da sauƙin narkewa a cikin ruwa. Lokacin da yake tsaka tsaki ko alkaline, maganin shine babban ruwa mai danko. Idan yana da zafi sama da 80 ℃ na dogon lokaci, danko zai ragu kuma zai zama insoluble cikin ruwa. Yana juya launin ruwan kasa lokacin zafi zuwa 190-205 ° C, kuma carbonizes lokacin zafi zuwa 235-248 ° C.
Saboda CMC yana da ayyuka na thickening, bonding, ruwa riƙewa, emulsification da dakatarwa a cikin ruwa bayani, shi ne yadu amfani a cikin filayen tukwane, abinci, kayan shafawa, bugu da rini, papermaking, textiles, coatings, adhesives da magani, high- karshen yumbura da batirin lithium Filin ya kai kusan kashi 7%, wanda aka fi sani da "monosodium glutamate masana'antu".
MusammanCMCcikin baturi, ayyuka na CMC sune: watsar da mummunan lantarki aiki abu da kuma conductive wakili; thickening da anti-sedimentation sakamako a kan korau electrode slurry; taimakawa haɗin gwiwa; daidaita aikin sarrafa na'urar lantarki da kuma taimakawa wajen inganta aikin sake zagayowar baturi; inganta ƙarfin kwasfa na guntun sandar, da sauransu.
Ayyukan CMC da zaɓi
Ƙara CMC lokacin yin slurry na lantarki zai iya ƙara danko na slurry kuma ya hana slurry daga daidaitawa. CMC zai lalata ions sodium da anions a cikin maganin ruwa mai ruwa, kuma danko na CMC manne zai ragu tare da karuwar yawan zafin jiki, wanda yake da sauƙin sha danshi kuma yana da ƙarancin elasticity.
CMC na iya taka rawar gani sosai a cikin watsawar graphite mara kyau. Yayin da adadin CMC ya karu, samfuransa na bazuwar za su manne da saman sassan graphite, kuma sassan graphite za su tunkuɗe juna saboda ƙarfin lantarki, samun sakamako mai kyau na watsawa.
Babban hasara na CMC shine cewa yana da ɗan karye. Idan duk CMC da aka yi amfani da matsayin mai ɗaure, graphite korau electrode zai rushe a lokacin latsawa da yankan aiwatar da iyakacin duniya yanki, wanda zai haifar da tsanani foda asarar. A lokaci guda, CMC yana da matukar tasiri ta hanyar rabon kayan lantarki da ƙimar pH, kuma takardar lantarki na iya fashe yayin caji da fitarwa, wanda kai tsaye yana shafar amincin baturi.
Da farko, abin ɗaure da aka yi amfani da shi don tayar da wutar lantarki mara kyau shine PVDF da sauran masu ɗaure mai tushen mai, amma la’akari da kariyar muhalli da sauran abubuwan, ya zama al'ada don amfani da masu haɗa ruwa don gurɓataccen lantarki.
Cikakken mai ɗaure ba ya wanzu, yi ƙoƙarin zaɓar abin ɗaure wanda ya dace da aikin sarrafa jiki da buƙatun lantarki. Tare da haɓaka fasahar baturi na lithium, da kuma farashi da al'amurran kare muhalli, masu amfani da ruwa za su maye gurbin masu amfani da mai.
CMC manyan hanyoyin masana'antu guda biyu
A cewar daban-daban etherification kafofin watsa labarai, da masana'antu samar da CMC za a iya raba kashi biyu: tushen ruwa hanya da sauran ƙarfi tushen hanyar. Hanyar da ake amfani da ruwa a matsayin hanyar amsawa ana kiranta hanyar ruwa mai mahimmanci, wanda ake amfani dashi don samar da matsakaici na alkaline da ƙananan CMC. Hanyar yin amfani da kwayoyin halitta a matsayin matsakaiciyar amsa ana kiranta hanyar warwarewa, wanda ya dace da samar da matsakaici da babban darajar CMC. Wadannan halayen guda biyu ana yin su ne a cikin kullun, wanda ke cikin tsarin kullun kuma a halin yanzu shine babbar hanyar samar da CMC.
Hanyar matsakaici na ruwa: tsarin samar da masana'antu a baya, hanyar ita ce amsa alkali cellulose da wakili na etherification a ƙarƙashin yanayin alkali kyauta da ruwa, wanda ake amfani da shi don shirya samfuran CMC matsakaici da ƙananan ƙananan, irin su detergents da ma'aikatan sizing na yadi Jira. . Amfanin hanyar matsakaici na ruwa shine cewa bukatun kayan aiki suna da sauƙi kuma farashin yana da ƙananan; rashin amfani shine saboda rashin babban adadin matsakaicin ruwa, zafin da aka haifar ta hanyar amsawa yana ƙara yawan zafin jiki kuma yana haɓaka saurin halayen gefe, yana haifar da ƙananan etherification yadda ya dace da rashin ingancin samfurin.
Hanyar narkewa; kuma aka sani da Organic ƙarfi Hanyar, an raba zuwa kneading hanya da slurry hanya bisa ga adadin dauki diluent. Babban fasalinsa shine cewa ana aiwatar da halayen alkalisation da etherification a ƙarƙashin yanayin ƙarancin ƙarfi kamar matsakaicin dauki (diluent) na. Kamar tsarin amsawa na hanyar ruwa, hanyar narkewa kuma ta ƙunshi matakai biyu na alkalization da etherification, amma matsakaicin amsawar waɗannan matakan biyu ya bambanta. Fa'idar hanyar da ake amfani da ita ita ce ta tsallake hanyoyin jika da alkali da dannawa da murkushewa da tsufa da ke tattare da hanyar ruwa, da kuma alkalization da tarwatsewa duk ana yin su ne a cikin kullu; rashin lahani shi ne cewa yanayin kula da zafin jiki ba shi da kyau, kuma buƙatun sararin samaniya ba su da kyau. ,mafi tsada.
Lokacin aikawa: Janairu-05-2023