Binciken dalilin bincike na rage ƙarfin batirin lithium

Forfatter: Iflowpower – Fournisseur de centrales électriques portables

A cikin baturin lithium ion, ana bayyana ma&39;aunin iya aiki azaman ma&39;auni na ma&39;auni na ingantacciyar hanyar lantarki zuwa ma&39;auni mara kyau, wato: <000000>gamma;= m + / m- =δXC- /δYC + na sama dabara C yana nufin ƙarfin coulomb na ka&39;idar na lantarki,δkadan,δY yana magana ne akan ma&39;aunin sinadari na ions lithium da aka saka a cikin mara kyaun lantarki da ingantacciyar lantarki. Ana iya gani daga wannan dabarar da ke sama cewa yawan adadin sandunan biyu yana dogara ne akan adadin ƙarfin coulomb da ions lithium masu jujjuyawa bisa ga sandunan biyu. Gabaɗaya, ƙaramin adadin taro yana haifar da rashin cika amfani da kayan lantarki mara kyau; mafi girman rabon taro na iya samun haɗari na aminci saboda rashin wutar lantarki da aka yi sama da shi.

A takaice, a cikin ingantacciyar ingancin rabo, aikin baturi yana da kyau. Dangane da tsarin batir Li-ION mai kyau, a cikin lokacin sake zagayowar, ba a canza adadin abun ciki ba, kuma ƙarfin farko a cikin kowane zagayowar ƙima ce, amma ainihin yanayin ya fi rikitarwa. Duk wani motsi na gefe wanda zai iya bayyana ko cinye lithium ions ko electrons na iya haifar da canji a ma&39;aunin ƙarfin baturi, da zarar ma&39;aunin ƙarfin baturi ya faru, wannan canjin ba zai iya jurewa ba, kuma ana iya tarawa ta hanyoyi da yawa, kuma aikin baturi yana faruwa.

Mummunan tasiri. Bugu da kari, ban da oxidation retentment na lithium ion, akwai babban adadin gefen halayen, kamar electrolyte bincike, aiki abu rushe, karfe lithium jita-jita, da dai sauransu. Na asali: overcharge 1, graphite korau overcharge: Lokacin da baturi ya wuce kima, lithium ion yana sauƙaƙa ragewa a cikin ƙasa mara kyau: lithium da aka ajiye an rufe shi da ƙasa mara kyau, yana toshe lithium sakawa.

An rage tasirin fitarwa da asarar iya aiki, na asali: 1 na iya ragewa ta hanyar lithium cyclic; 2 ajiya na ƙarfe lithium da sauran ƙarfi ko goyan bayan electrolyte don samar da Li2CO3, LIF ko wasu samfuran; 3 karfe lithium yawanci ana samuwa a tsakanin mummunan electrode da diaphragm, mai yiwuwa The pores na toshe diaphragm yana ƙara ƙarfin ciki na baturi;. Yin caji mai sauri, maɗaukakin yawa na yanzu, mummunan polarization mara kyau, jigon lithium zai zama ƙarara. Wannan yanayin yana da sauƙin faruwa a cikin wani yanayi na rashin wutar lantarki mai aiki.

Duk da haka, a cikin yanayin yawan caji mai yawa, ƙaddamar da lithium na ƙarfe na iya faruwa ko da adadin ma&39;auni mai inganci da mummunan aiki na al&39;ada ne. 2, madaidaicin madaidaicin halayen yana da ƙasa sosai lokacin da ingantaccen ƙarfin ƙarfin lantarki ya yi ƙasa sosai, kuma yana da sauƙin caji. Kyakkyawan canji yana haifar da asarar iya aiki saboda faruwar abubuwan da ba a iya amfani da su ba (kamar CO3O4, MN2O3, da dai sauransu).

), wanda ke rushe ma&39;aunin iya aiki tsakanin na&39;urorin lantarki, kuma asarar ƙarfinsa ba zai iya jurewa ba. (1) liycoo2liycoo2→(1-y) / 3 [CO3O4 + O2 (G)] + Ylicoo2Y <0.4 Simultaneous positive electrode material analyzes oxygen in a sealed lithium ion battery to analyze the oxygen due to the absence of re-reactive reaction (such as the formation of H2O) and the combustible gas in the electrolyte analysis At the same time, the consequences will be unimaginable.

(2)λ-MnO2 lithium manganese dauki yana faruwa a cikin yanayin da lithium manganese oxide ya kasance cikakke.:λ-Mno2→Mn2O3 + O2 (G) 3, electrolyte ne oxidized lokacin da electrolyte aka oxidized lokacin da matsa lamba ya fi 4.5V, da kuma electrolyte (misali.

, Li2CO3) da gas suna oxidized, kuma waɗannan insolublements za su toshe micropores na lantarki. Hijira na lithium ions yana haifar da asarar iya aiki yayin zagayowar. Yana shafar ƙimar adadin iskar shaka: Nau&39;in da girman girman yanki na wakili mai gudanarwa (baƙar carbon, da sauransu.

) ƙara da tabbataccen lantarki abu surface yanki size tara abu (carbon baki, da dai sauransu) a halin yanzu amfani electrolytic bayani, EC / DMC an dauke da mafi girma hadawan abu da iskar shaka iya aiki. Tsarin oxidation na electrochemical na maganin ana bayyana shi azaman: bayani→Oxidation kayayyakin (gases, mafita da kuma m abubuwa) + NE-kowane sauran ƙarfi hadawan abu da iskar shaka iya kara yawan taro na electrolyte, da electrolyte kwanciyar hankali da aka saukar, da ikon baturi ne a karshe.

A ce yana cinye ɗan ƙaramin ɓangaren electrolyte duk lokacin da aka caje shi, to, ƙarin electrolyte yana haɗuwa da baturi. Don kwantena akai-akai, wannan yana nufin cewa an ɗora ɗan ƙaramin abu mai aiki, wanda zai haifar da raguwar ƙarfin farko. Bugu da ari, idan samfur mai ƙarfi ya faru, an samar da fim ɗin wucewa akan saman lantarki, wanda zai sa baturi ya ƙara ƙarfin fitarwa na baturin.

Na asali 2: Electrolyte (Maidawa) I A kan nazarin lantarki 1 Rage ƙarfin baturi, rage yawan electrolyte a kan ƙarfin baturi da rayuwa mai yawo zai yi tasiri sosai, kuma saboda raguwar iskar gas don ƙara baturi, wanda zai haifar da matsalolin tsaro. Ingantattun ƙarfin lantarki na bincike na lantarki yawanci ya fi 4.5V (wanda ke da alaƙa da Li / Li +), don haka ba su da sauƙin tantancewa a cikin tabbatacce.

Madadin haka, electrolytes sun fi bambanta don tantancewa. 2, electrolyte an bincikar a kan mummunan lantarki: electrolyte ba shi da girma a cikin graphite da sauran nau&39;in carbon na pithonal, kuma yana da sauƙin amsawa idan ba zai iya jurewa ba. Binciken bayani na electrolytic a lokacin caji na farko da fitarwa zai samar da fim ɗin wucewa a saman wutar lantarki, kuma fim ɗin wucewa zai iya hana ƙarin bincike na electrolyte da carbon negative electrode.

Don haka, ana kiyaye kwanciyar hankali na tsarin carbon korau electrode. Da kyau, raguwa na electrolyte yana iyakance ga matakin samuwar fim ɗin wucewa, kuma tsarin ba ya faruwa lokacin da sake zagayowar ya tsaya. Ragewar samuwar gishirin electrolyte na fim ɗin wucewa yana shiga cikin samar da fim ɗin wucewa, wanda ke sauƙaƙe daidaitawar fim ɗin wucewa, amma abin da aka narkar da shi wanda aka rage zuwa mai ƙarfi yana da illa ga samfuran rage ƙarfi; (2) raguwar gishiri na electrolyte An rage ƙaddamar da maganin electrolytic, kuma a ƙarshe ya haifar da ƙarfin baturi (raguwar LiPF6 don samar da LIF, LiXPF5-X, PF3O da PF3); (3) Samar da fim ɗin wucewa shine cinye ions lithium, wanda zai iya haifar da ƙarancin iyakacin iyaka.

An rage duka baturi. (4) Idan akwai tsage akan fim ɗin wucewa, za&39;a iya canja wurin sauran kwayoyin halitta don sanya fim ɗin wucewa ya yi kauri, wanda ba wai kawai yana cin ƙarin lithium ba, amma yana yiwuwa a toshe micropores a saman carbon ɗin, wanda ke haifar da lithium ya kasa sakawa da fitar da shi. Ƙara wasu abubuwan da ba a haɗa su ba, kamar CO2, N2O, CO, SO2, da dai sauransu.

, zai iya hanzarta samuwar fim ɗin wucewa, kuma yana iya hana alamar alama da bincike na sauran ƙarfi, da ƙari na kambi na ether Organic ƙari yana da tasiri iri ɗaya, inda 12 kambi 4 ether ya fi kyau. Abubuwan da ke haifar da asarar iya aiki na fim: (1) Nau&39;in carbon; (2) sinadaran electrolyte; (3) Additives a cikin electrode ko electrolyte. BLYR ya yi imanin cewa ion musayar amsawa yana ci gaba daga saman kayan aiki zuwa ainihin sa, an binne sabon lokaci da aka kafa, kuma saman sassan suna haifar da ƙananan ion da electron conductivity, don haka spinel bayan ajiya.

Ƙarin polarization fiye da ajiya. ZHANG ya gano kwatankwacin bazuwar bakan AC impedance kafin da kuma bayan na&39;urar lantarki, tare da sabon adadin hawan keke, juriya na farfajiyar wucewar shimfidar wuri ya karu, kuma ikon mu&39;amala ya ragu. Nuna kauri na passivation Layer yana ƙara da adadin hawan keke.

Rushewar manganese da bincike na electrolyte yana haifar da samuwar fim ɗin wucewa, da yanayin zafi mai zafi ya fi dacewa da waɗannan halayen. Wannan zai haifar da juriya kai tsaye na barbashi kayan aiki da karuwa a cikin juriya na ƙaura Li +, ta haka zai ƙara polarization na baturi, kuma caji da fitarwa ba su cika ba, kuma ƙarfin yana raguwa. II electrolytic bayani reductant inji electrolyte sau da yawa ya ƙunshi datti kamar oxygen, ruwa, carbon dioxide, da oxidative halayen faruwa a lokacin cajin baturi da fitarwa tsari.

The rage inji na electrolyte hada da sauran ƙarfi rage, electrolyte ragewa da ƙazanta rage uku al&39;amurran: 1, da rage sauran ƙarfi rage PC da EC hada da wani electron dauki zuwa na biyu lantarki dauki tsari, na biyu electron dauki siffofin Li2CO3: FONG, da dai sauransu, a cikin farko A lokacin fitarwa tsari, da lantarki m yana kusa da O.8V (vs.

li/li +), PC / EC yana haifar da amsawar electrochemical akan graphite, yana samar da CH = CHCH3 (G) / CH2 = CH2 (G) da LiCO3 (s) , Sakamakon rashin iya jurewa iya aiki akan wayoyin graphite. Aurbach et al don nau&39;in nau&39;in rage yawan electrolyte da samfuran sa akan lantarki na lithium na ƙarfe da lantarki na tushen carbon, sun gano cewa RocO2Li da propylene sun faru ne a cikin injin amsawar lantarki na PC. Roco2li yana da matukar damuwa ga gano ruwa.

M samfurin shine Li2CO3 da propylene, amma babu Li2CO3 a cikin akwati na bushewa. Ein-Eliy ya ruwaito cewa wani electrolyte da aka yi da Diethyl carbonate (DEC) da diomethymethane (DMC), halayen halayen yana faruwa a cikin baturi, kuma an kafa methyl carbonate (EMC), kuma akwai wani asarar iya aiki. Tasiri

2, raguwar amsawar raguwar electrolyte na electrolyte gabaɗaya ana la&39;akari da cewa yana da hannu a cikin samuwar saman na&39;urar lantarki, sabili da haka, nau&39;ikan da abubuwan da ke tattare da shi zai shafi aikin lantarki na carbon. A wasu lokuta, raguwa na electrolyte yana ba da gudummawa ga kwanciyar hankali na carbon surface, kuma zai iya samar da Layer passivation da ake so. An yi imani da cewa goyon bayan electrolyte ya fi sauƙi don ragewa fiye da sauran ƙarfi, da kuma raguwar haɗar samfurin a cikin fim ɗin da aka ajiye mara kyau kuma yana rinjayar ƙarfin ƙarfin baturi.

Yawancin halayen ragewa waɗanda ke tallafawa electrolytes na iya faruwa kamar haka: 3, abun ciki na ruwa a cikin Rage Rashin Tsabta (1) Abubuwan da ke cikin ruwa a cikin electrolyte za su samar da LiOH (S) da Li2O deposition layers, wanda ba shi da amfani ga lithium ion sakawa, yana haifar da asarar ƙarfin da ba za a iya canzawa ba: H2O + E.→OH- + 1 / 2H2OH- + Li +→LiOH (s) LiOH + Li ++ E-→Li2O (S) + 1 / 2H2 yana samar da LiOH (S) don saka saman wutar lantarki, samar da babban fim mai girma wanda yake da babban juriya, yana hana Li + saka graphite lantarki, yana haifar da asarar ƙarfin da ba za a iya jurewa ba. Matsakaicin ruwa a cikin sauran ƙarfi (100-300×10-6) Babu wani tasiri akan aikin lantarki na graphite. (2) CO2 a cikin sauran ƙarfi za a iya rage a kan korau electrode don samar da CO da LiCO3 (S): 2CO2 + 2E- + 2LI +→Li2CO3 + COCO zai ƙara baturi a cikin baturi, yayin da Li2CO3 (S) yana ƙara ƙarfin baturi yana ƙara ƙarfin baturi.

(3) Kasancewar iskar oxygen a cikin kaushi shima yana samar da Li2O saboda yuwuwar bambancin dake tsakanin karfe lithium da carbon na lithium gaba daya a layi daya kadan ne, kuma raguwar electrolyte akan carbon yayi kama da raguwar lithium. Asali na 3: Fitar da kai na nufin cewa batir ya ɓace a yanayin da ba a yi amfani da shi ba. Sakamakon fitar da batirin lithium-ion da kansa a lokuta biyu: ɗaya shine asarar iya aiki; na biyu shi ne asarar da ba za a iya jurewa ba.

Rashin iya jujjuyawa yana nufin cewa za&39;a iya dawo da ƙarfin asarar yayin caji, kuma asarar ƙarfin da ba za a iya jujjuya shi ba yana juyewa, kuma ana iya amfani da na&39;urar mai inganci da mara kyau a cikin amfani da micro-cell tare da electrolyte a cikin yanayin caji, kuma lithium ion yana sakawa kuma ya ɓace, haɓakawa mai kyau da mara kyau da kashewa. Ion lithium da aka saka suna da alaƙa kawai da ion lithium na electrolyte, kuma ƙarfin lantarki mai inganci da mara kyau saboda haka rashin daidaituwa. Ba za a iya dawo da wannan ɓangaren asarar iya aiki lokacin caji ba.

Irin su: Lithium manganese oxide tabbatacce electrode da sauran ƙarfi iya haifar da kai-fitarwa lalacewa ta hanyar kai-fitarwa: sauran ƙarfi kwayoyin (misali, PC) suna oxidized a matsayin microbial Kwayoyin a kan surface na conductive abu carbon baki ko na yanzu ruwa ruwa: guda, korau electrode aiki abu Yana iya zama kai-fitarwa daga electrolytic bayani ga electrolyte (6 PF) da electrouchs da aka rage ta electrolyte. kamar LiPF6).

An cire lithium ion daga mummunan lantarki na microcontroller a matsayin mummunan electrode na halin caji: abubuwan da ke fitar da kai: Tsarin samar da kayan lantarki mai kyau, tsarin samar da baturi, kaddarorin electrolyte, zazzabi, lokaci. Adadin fitar da kai ana sarrafa shi tamtsattse ta hanyar iskar oxygen mai ƙarfi, don haka kwanciyar hankali na sauran ƙarfi yana shafar rayuwar ajiyar baturi. A hadawan abu da iskar shaka na sauran ƙarfi faruwa a cikin surface na carbon baki, da kuma carbon baki surface yankin iya sarrafa kai-fitarwa kudi, amma ga LIMN2O4 tabbatacce electrode abu, rage surface yankin na aiki abu ne ma tam, da kuma na yanzu tara surface fuskantar yin amfani da ƙarfi hadawan abu da iskar shaka ba za a iya watsi da.

A halin yanzu da batirin diaphragm ke yabo kuma na iya haifar da fitar da kai a cikin batirin lithium ion, amma tsarin yana iyakance ne ta hanyar juriya na diaphragm, a cikin rahusa, kuma ba shi da alaƙa da yanayin zafi. La&39;akari da cewa adadin fitar da kai na baturi yana dogaro da ƙarfi sosai akan zafin jiki, wannan tsari ba wata hanya ce mai mahimmanci ba wajen fitar da kai. Idan mummunan lantarki yana cikin yanayin isasshen wutar lantarki, abubuwan da ke cikin baturin sun lalace, wanda zai haifar da asarar iya aiki na dindindin.