Me yasa zafin baturin ya fita daga sarrafawa? Shin dalilin gajeriyar kewayawa ne?

Mawallafi: Iflowpower - Mai Bayar da Tashar Wutar Lantarki

Batirin lithium mai ƙarfi fiye da makamashi shine masoyin masana&39;antar baturi a yau, duk da haka, mafi girma makamashi, amincin kuma ya bambanta. Tsarin gazawar baturi shima yana da rikitarwa sosai. Lokacin nazarin tsarin sarrafa zafin baturi, mutane a baya sun sami damar yin nazarin yanayin zafi zuwa tsarin baturi ɗaya, kamar cathodes, anodes, diaphragms, da electrolytes.

Misali, raguwar diaphragm ko rufewar da bai cika ba yana daure don ƙara yawan abin da ke faruwa a yanzu, wanda ke haifar da zazzaɓi na gida ko ma haifar da zafi daga sarrafa baturi. Don haka, shirya babban diaphragm mai daidaita zafi yana ɗaya daga cikin hanyoyin inganta amincin baturi. Koyaya, matsalar ita ce, ta yaya zazzaɓi mai daidaitawa diaphragm ke magance matsalar amincin baturi? Babban abin nema a yau mai ƙarfi mai ƙarfi (m yumbu da polymer electrolyte ya maye gurbin diaphragm na gargajiya da lantarki), shin zai iya rage amincin baturi sosai? Kwanan nan, jami&39;ar Qinghua Ouyang Ming Te Team ta yi nuni da cewa, tsarin aminci na batirin lithium mai amfani da wutar lantarki ba wai kawai don inganta amincin kayan abu guda ne kawai ba, amma ya kamata a fara daga matakin tsarin.

Marubucin yayi la&39;akari da abubuwan matakin baturi da matakin kayan aiki, kuma ana nazarin tsarin sarrafa zafi na batirin lithium mai ƙarfi. Binciken ya dogara ne akan graphite azaman anode, Layer crystal Layer Li0.5Mn0.

3CO0.2O2 (NMC532) batirin lithium mai nau&39;in nau&39;in 25aH ne na masana&39;anta na PET / yumbu mara amfani azaman diaphragm. Mawallafa suna nazarin gas ɗin cathode, tsarin tsarin (lokaci) da kuma samar da zafi lokacin da babu anode, lokacin da akwai yanayin aiki, kuma ana nazarin cathode.

An ba da shawarar cewa idan sakin cathode O2 zai iya amsawa tare da anode, zai zama babbar matsalar tsaro mai yuwuwa! Ta hanyar sassa biyu na gwajin aminci na ƙira, marubucin ya fara gudanar da gwajin Arc na duka baturi, sannan kuma da sassa daban-daban na baturin. Daga cikin su, gwajin EV-ARC ya rubuta dukkan tsarin zafin batirin da ba a sarrafa shi ba, kuma an gano cewa zafin zafin batirin ya yi ƙasa da yanayin zafi na membrane, wanda ke nuna cewa baturin bai faru ba saboda gazawar nassi. Babban yanki gajere.

Wannan shi ne rahoton farko ba tare da thermal daga sarrafawa ba a yanayin gajeriyar kewayawa na ciki. Domin yin nazarin takamaiman hanyoyin tafiyar da zafi, ƙungiyar ta yi amfani da fasahar DSC don nazarin yanayin zafi (cathode, anode, electrolyte, da haɗuwa da su) na ɓangarori daban-daban na baturi; Yi amfani da fasahar XRD mai girma na kan layi don ƙayyade cathode yayin dumama da bazuwar thermal, Bugu da ari, marubucin yana amfani da fasahar bincike na thermal synchronous (DSC-TG) da spectrometry (MS), gano zafi, asarar nauyi da tsarin sakin gas. Don ƙara tabbatar da ƙarshe, marubucin zai daskare nitrogen mai ruwa da sauri a cikin 206 ¡ã C, jerin gwaje-gwaje na gaba, ciki har da gwajin SEM, ICP-OES da XPS, ciki har da gwajin SEM, ICP-OES da XPS.

Hoto 1 Asalin kaddarorin batirin lithium mai ƙarfi: a. Ayyukan kewayawa da ingancin Kurun; b. Ƙarfin ƙimar ƙarfin baturin lithium mai ƙarfi yana nuna kyakkyawan aikin sake zagayowar da aikin haɓakawa.

Makon fitarwa na mako na farko shine 25.04ah, har yanzu 24.08ah bayan makonni 292, kuma adadin iya aiki ya kai 96%.

Ko da a 4C, har yanzu akwai damar 21.5ah. Hoto 2 Auna zafin zafi daga ikon baturin lithium mai ƙarfi ta amfani da EV + ARC.

Ƙananan hoto shine lokacin autopilot (0-105s) mawallafa suna amfani da EV + ARC don saka idanu da zafi daga ikon baturin lithium. T1 shine farkon zafin jiki na dumama kai, T2 shine thermal daga yanayin zafin jiki (TR), T3 shine mafi girman zafin jiki. T1 shine 115.

2 ¡ã C. Daidaitaccen rikodin kayan aikin ƙarƙashin wannan tsarin hawan zafin jiki (T1→T2) halayen sinadarai. Na farko, lalata fim ɗin SEI na anode yana haifar da anode anode da aka fallasa zuwa electrolyte don samar da sabon fim ɗin SEI, kuma zafi kuma zafi ne; SEI ana maimaita shi akai-akai, yana haifar da ɓacewa da abubuwan da ba a haɗa su ba na ɓangaren carbonate na anode surface Rising; halayen gefen yana faruwa, yana haifar da zafin jiki ya tashi har sai zafin asarar zafi TR (T2 = 231 ¡ã C).

A wannan lokacin, ma&39;aunin zafin baturi yana tashi, kuma yanayin exothermic yana da tsanani sosai. Tare da sakin baturin hayaki mai yawa; Bugu da ƙari, ƙarar ƙarar baturi a bayyane yake, wanda ke tabbatar da cewa yanayin da ke tattare da wannan tsari yana haifar da iskar gas. Bayan kai T2, zafin baturi yana cikin ƴan daƙiƙa kaɗan, da sauri ya ƙaru zuwa 815 ¡ã C don cimma mafi girman darajar T3.

Hoto 325AHSC-NMC532 / graphite thermal out-na sarrafawa halayyar A. Dangantakar da ke tsakanin ƙimar hasarar zafi, ƙimar haɓakar zafin jiki, ƙarfin baturi da juriya na ciki da cikakken zafin jiki; B. Kafin hasarar zafi, juriya na ciki yana biye da cikakkiyar canjin zafin jiki (ɓangaren adadi) Lokacin da zafin jiki ya fita daga sarrafawa, ƙarfin baturi ya bambanta tare da cikakken yanayin zafi zuwa cikakken bincike na yanayin ciki na baturi.

Lokacin da aka gwada marubuta, ana yin rikodin canje-canje na ainihin lokacin ƙarfin lantarki da juriya na ciki. Hoto 3A, bayan jujjuyawar yanayin hawan zafin jiki yana faruwa bayan 160 ¡ã C, T1 (115.2 ¡ã C), wanda ke da alaƙa da sake samuwar SEI da rushewar LiPF6, wannan tsari yana haɓaka samar da zafi da iskar gas.

Canjin wutar lantarki yana nuna cewa thermal daga sarrafawa (T2 = 231 ¡ã C) yana faruwa, ana kiyaye ƙarfin lantarki sama da 2.0V, wanda ke tabbatar da cewa babu ɗan gajeren lokaci. Canje-canje a cikin juriyar baturi sun kasu kashi huɗu: mataki na I ( <145 ¡ã C), the internal resistance is slow to 22.

1M. Kadan dogara; mataki II (145175 ¡ã C), juriya na ciki 22.1m→143.

3m ku. An karye jakar baturi a 145 ¡ã C, yana haɓaka harin electrolyte, yana haifar da karuwa a cikin juriya na ciki; karuwa a cikin rashin daidaituwa na cathode kuma yana ƙara ƙarfin ciki na baturi; lalatawar saman anode SEi yana haifar da sabbin abubuwan haɓaka inorganic, rage haɓakar ion, kuma yana haifar da ƙara juriya na ciki; mataki III (180231 ¡ã C), juriya na ciki 143.3m→56.

5m ku. Kafin hasarar zafi, raguwa a cikin juriya na ciki shine saboda rushewar karfen canji da rushewar gishiri na lithium, za a tabbatar da shi daga baya; mataki IV (> 231 ¡ã C), juriya na ciki 56.5m→1011.

2m. Bayan asarar zafi, baturin yana ƙonewa, ƙarfin lantarki yana raguwa da sauri a cikin &39;yan dakiku, kuma juriya na ciki yana da sauri ya tashi zuwa 1011.2m.

A wannan lokacin, diaphragm ɗin ya tarwatse, baturin ya lalace gaba ɗaya. Hoto 4PET-ceramic ba sakan tsarin rufewa da kwanciyar hankali na thermal: PET-ceramic nonwoven yadudduka bayan gwajin kwanciyar hankali na thermal (dakin zafin jiki 450 ¡ã C), SEM scan, dakin zafin jiki da 450 ¡ã C ilimin halittar jiki da taswirar abubuwan taswira Bayan 500 ¡ã C a dakin da zafin jiki, da DSC zafi ya kwarara da kuma diap0 rage yawan zafin jiki na TGA0 hasãrar da aka rasa. C/min; PET-ceramic nonwoven masana&39;anta diaphragm, kwatancin babban hoton SEM na Al2O3; ra&39;ayi mai ban sha&39;awa, Al2O3 barbashi The PET nonwoven masana&39;anta zaruruwa nannade cikin na al&39;ada PP, PE diaphragm nuna kyakkyawan thermal kwanciyar hankali. Kamar yadda aka nuna a cikin Hoto 4A, a cikin 230 ¡ã C na minti 30, ƙananan zafi kaɗan ne kawai ke faruwa (1.

2%). Kamar yadda aka nuna a cikin Hoto 4B, PET yana narkewa tare da canja wuri mai zafi a 257 ¡ã C, da raguwar nauyin nauyin 432 ¡ã C. SEM na Hoto 4C yana nuna cewa ba saƙa PET nanofibers an saka su a cikin barbashi yumbu, ba shafi mai gefe biyu na barbashi yumbu ba.

Hoto na 4C sashen SEM yana nuna cewa diaphragm shine 19.5μM Hoto 5 Gwada yanayin zafi na kowane bangare na baturin jihar ta DSC: a. Lokacin da maganin electrolytic ya kasance, cajin lantarki (Ce); b.

A gaban electrolyte, cajin lantarki. A anode; CA cathode; ELE electrolyte; Alamar caja ta CE Hoto na 5a yana nuna cewa cathode da anode sun yi ƙasa da nisa fiye da samar da zafi na cathode da anode tare; Hoto na 5B ya nuna cewa kasancewar ko rashin electrolyte Babu wani tasiri mai mahimmanci. Saboda haka, ba tare da la&39;akari da ko electrolyte ya kasance ba, haɗa cathode da anode, za a yi zafi mai yawa.

Marubucin ya yi hasashe cewa akwai amfani da juna tsakanin cathode anode, wanda zai iya zama halayen sinadaran. Hoto 6 Canjin tsari, samar da zafi da kuma sakin O2 na cajin kayan cathode: a. Babban zafin jiki XRDB.

A yanayin zafi daban-daban, ana auna zafin wurin da kuma sakin tsarin DSC da TGA-MS lokacin da yawan zafin jiki, Dithodium NMC Ba tsayayye ba, canjin tsarin zai bi sakin O2. Marubucin ya yi hasashe cewa dalilin rashin kulawar thermal shine sakin amfani da juna tsakanin O2 da anode. Hoto 6A yana nuna cewa NMC 532 ya fara canza canjin tsarin da aka tsara zuwa tsarin spinel a 350 ¡ã C har zuwa 350 ¡ã C.

Hoto na 6B ya nuna cewa tsarin MS na nazarin zafi na DSC masu zafi da kuma sakin O2 ya dace da tsarin tsarin, kuma akwai kololuwa a 276 ¡ã C, ma&39;ana canji mai tsanani. Hoto 7 yana tsakanin cajin jihar cathode da anode, tsangwama tsakanin matakin halayen sinadaran: cathode mai caji daban, kololuwar sakin iskar oxygen mai ƙarfi; duk da haka, lokacin da cathode da anode na halin cajin suna nan, babu ainihin wani sashi Duk da haka, a cikin tazarar zafin jiki guda ɗaya, samar da zafi yana da girma sosai, kuma ana fitar da yanayin caji a yanayin zafi mai girma dangane da tsarin tsangwama tsakanin juna na halayen sinadaran, kuma kawai an saki ƙananan zafi; lokacin da akwai anode, O2 zafi ya fita daga sarrafawa. Don haka, don kare lafiyar tsarin batirin lithium na inji, tsarin kula da thermal ya kamata ya shiga tsakani kafin zafin zafi ya fita daga sarrafawa, in ba haka ba yana da wahala a hana batir ɗin wuta koda kuwa nitrogen mai ruwa yana da aikin watsar da zafi mafi ƙarfi.

Hoto 8 Lokacin da ya faru na asarar zafi, yanayin yanayin nitrogen na ruwa yana daskarewa ta hanyar ruwa nitrogen, canjin canjin ruwa na nitrogen na ruwa, ana ƙara yawan zafin jiki da ƙarfin baturi a 206 ¡ã C, kuma hoton shine fuskar gaba (I) da gefen gefen baturi bayan ruwa nitrogen sanyaya (II) Hoto; Tsarin lamination na nau&39;in Z da baturi bayan sanyaya a cikin ruwa nitrogen a 206 ¡ã C, nitrogen ruwa nitrogen a cikin cathode na ciki, anode da diaphragm, da sauri zuwa -100 ¡ã C a cikin baturi na 206 ¡ã C, ko da yake gefen jakar gaban baturi yana Bracked (Hoto 8A). Hoto na 8B yana nuna batir ɗin batir ɗin da aka ruguje, babu rami mai gani ko lalata saman ƙasa, yana nuna cewa yana kiyaye ƙarfin ƙarfin lantarki kuma yana hana gajeriyar kewayawa yadda ya kamata; da cathode surface da daidai diaphragm ne baƙar fata bel, wanda shi ne Ni, CO, MN miƙa mulki karfe jibo Babu signifi.