Electrolyte y’obutonde (organic electrolyte) kye ki?
Ekirungo ekisengejja amasannyalaze (organic electrolyte) kye kisosonkole ekiyisa (conducting solution) nga ebirungo ebikola (organic compounds) bikola ng’ekizimbulukusa (solvent) ku minnyo egisaanuuse. Ebiwujjo bino bisobozesa entambula ya ion wakati w’obusannyalazo mu bbaatule nga tukozesa kaboni-ebizimbulukusa ebisinziira ku ethylene carbonate oba dimethyl carbonate, okusinga amazzi oba ebintu ebitali biramu.
Omulimu gw’amasannyalaze aga organic mu bbaatule za lithium .
Bwoba wali weebuuzizzaako .Whats bbaatule ya lithium .Ekoleddwa mu, electrolyte etuula ku mutima gw’omulimu gwayo. Battery za lithium-zisinziira ku busannyalazo obukola obutonde okutambuza amasannyalaze ga lithium wakati wa katodi ne anode mu kiseera ky’enzirukanya y’ekisannyalazo n’okufulumya. Awatali kino liquid medium, bbaatule simply teyandikoze.
Ekirungo ekimanyiddwa kizingiramu omunnyo gwa lithium-okusinga obungi lithium hexafluorophosphate (LIPF₆) -okusaanuusibwa mu kutabula kw’ebiziyiza ebiramu. Kino kitondekawo ekisengejjero ekirimu obutambuzi bwa ayoni obw’amaanyi obusobozesa amasannyalaze ga lithium agalina ekisannyalazo ekirungi okutambula mu ddembe ate nga gaziyiza okukulukuta kw’obusannyalazo, ekintu ekyandireese short circuits.
Battery za lithiyamu ez’ettunzi-ezikozesa ebirungo ebiramu okusinga eby’amazzi (amazzi-okusinziira) olw’ensonga enkulu: ebiziyiza ebiramu bisigala nga binywevu ku vvulovumenti ezisukka 4.5 volts, so nga amazzi gavunda waggulu wa 1.23 volts ku bbugumu erya bulijjo. Enkizo eno eya vvulovumenti evvuunula butereevu mu bbaatule z’amaanyi aga waggulu.
Ebizimbulukusa ebya bulijjo eby’obutonde mu bbaatule z’amasannyalaze .
Ensengekera y’amasannyalaze ag’obutonde (organic electrolytes) ekyukakyuka okusinziira ku byetaago by’okukozesa, naye ebiziyiza ebiwerako bye bifuga:
cyclic kaboni: .
ethylene carbonate (EC) egaba dielectric high constant ne excellent salt solubility, wadde nga kikalu ku bbugumu erya bulijjo
Propylene carbonate (PC) esigala nga ya mazzi naye esobola okuleeta graphite exfoliation mu bintu ebimu ebya anode .
Vinylene Carbonate (VC) etera okulabika ng’ekyongera okulongoosa obutebenkevu bw’amasannyalaze .
linear carbonates: .
Dimethyl Carbonate (DMC) ekuwa obuzito obutono okusobola okutambuza ion ennungi .
Diethyl Carbonate (DEC) egeraageranya obutambuzi n’obukuumi .
Ethyl methyl carbonate (EMC) egatta eby’obugagga bya DMC ne DEC byombi .
Ebirungo ebisinga eby’ettunzi bigatta cyclic ne linear carbonates. Omutabula ogw’omutindo guyinza okubaamu ebitundu 30% EC nga gulimu ebitundu 70% DEC, ne kitondekawo amazzi agalina obutambuzi obw’amaanyi n’obuzito obutuufu. Akatale k’ensi yonna aka lithium-ion battery electrolyte solvent kaatuuka ku buwumbi bwa ddoola 10.55 mu 2024 era nga kasuubirwa okukula okutuuka ku buwumbi bwa ddoola 28.12 mu 2034, nga kino kiraga obukulu obw’amaanyi obw’ebintu bino.
Ether-Ebiziyiza ebisinziira ku:
1,2-dimethoxyethane (DME) egaba obutebenkevu ne lithium metal anodes .
Tetrahydrofuran (THF) ekuwa viscosity entono .
1,3-dioxolane erongoosa obulungi bw’obugaali .
Abanoonyereza era banoonyereza ku mazzi ga Ionic ng’ebintu ebirala eby’obukuumi. Eminnyo gino egyasaanuuse gisigala nga gya mazzi ku bbugumu erya bulijjo era nga kumpi giwa puleesa y’omukka nga zero, ekizifuula ezitakwata muliro. Naye, viscosity yazo esingako ekendeeza ku ionic conductivity bw’ogeraageranya ne organic solvents eza bulijjo.
Engeri Electrolytes ez'obutonde gye zisobozesaamu okukola kwa bbaatule .
Enkola y’okukola nnyangu naye nga ya kitiibwa. Mu kiseera ky’okufulumya, lithium ions ku anode efuluma mu electrolyte ne zisenguka nga zigenda mu cathode. Obusannyalazo, obutasobola kuyita mu kisengejja, bitambula mu nkulungo ey’ebweru-Okukulukuta kuno okw’obusannyalazo ye masanyalaze agakola ebyuma.
Electrolyte erina okumatiza ebyetaago ebiwerako ebivuganya. Kyetaaga viscosity entono olw’okutambula kwa ion okw’amangu, ekikyukakyuka kya dielectric eky’amaanyi okusobola okwekutula ku munnyo gwa lithium, eddirisa ly’obutebenkevu bw’amasannyalaze agagazi okuziyiza okuvunda, n’okutebenkera kw’eddagala n’obusannyalazo bwombi. Okuzuula ebikozesebwa ebigerageranya ebintu bino byonna kisigala nga kizibu.
Ekintu ekimu ekikulu kibeerawo ku bitundu by’obusannyalazo: okutondebwa kw’ekisenge ky’amasannyalaze ekigumu (SEI). Battery bw’esooka okucaajinga, electrolyte ekitundu kivunda ku anode surface, ne kikola layer ennyimpi ekuuma. SEI eno esobozesa ion za lithium okuyita nga ziziyiza obusannyalazo n’okuziyiza okuvunda kw’amasannyalaze okulala. Omutindo n’obutebenkevu bwa layeri eno bikosa nnyo obulamu bwa bbaatule n’obukuumi.
Organic vs. ebyuma ebikozesebwa mu mazzi .
Okulonda wakati w’amasannyalaze ag’obutonde n’ag’amazzi kuzingiramu okusuubulagana okukulu. Enkola z’amazzi ziwa molekyu z’amazzi eza waggulu-ezitambuza amasannyalaze mu ngeri ennungi okusinga ebisengejja ebiramu. Era zisingako obukuumi, za buseere, era nnyangu okukwata okuva amazzi bwe gatakwata muliro wadde obutwa.
Naye ekyo 1.23-Eddirisa ly’okutebenkera kwa vvuloti litta enkola z’amazzi ku nkola ezisinga obungi. Battery za lithium-ion zikola wakati wa 3.7 ne 4.2 volts, okusukka nnyo amazzi ge gasobola okugumira. Abanoonyereza abamu basindiikiriza enkola z’amazzi okutuuka ku 2.0-2.5 volts nga bakozesa eddagala ly’omunnyo eririmu ebirungo ebingi, naye kino kisaddaaka enkizo y’omuwendo era ne kireeta ebizibu ebipya.
Organic electrolytes zifuga akatale si lwakuba nti zituukiridde, wabula lwakuba nti ze zisinga obulungi eziriwo ku nkola za high-Voltage. Enkizo y’amasoboza (energy density advantage) ekwata nnyo -Enjawulo wakati w’emmotoka ey’amasannyalaze erimu enjawulo ya mayiro 100 okusinziira ku bbanga lya mayiro 300.
Okusoomoozebwa mu by’okwerinda n’okugonjoola ebizibu .
Ekizibu ekikulu eky’ebirungo ebiziyiza omuliro (organic electrolytes) kwe kukwata omuliro. Ebizimbulukusa bya kaboni bikoleeza mangu, era omuliro gwa bbaatule ya lithium-ekola ebbugumu ery’amaanyi. Ebbugumu ery’ebbugumu-Ebbugumu ery’omunda lyanguyira ensengekera z’eddagala ezikola ebbugumu erisinga{4}}eyinza okuvaako omuliro oba okubwatuka.
Enkola eziwerako zikola ku kabi kano:
Ennimi z'omuliro-Ebirungo ebiziyiza:Okwongera ebirungo nga trimethyl phosphate oba fluorineted solvents kikendeeza ku muliro. Okunoonyereza okwafulumizibwa mu 2020 kwalaga EC-okusinziira ku busannyalazo obutali bwa muliro nga tukozesa methyl(2,2,2-trifluoroetyl)carbonate. Obutoffaali obukozesa ensengekera eno bwakola ku 100 cycles ku 4.5V charge cutoff-conditions nti mu ngeri entuufu yandireese amasannyalaze aga bulijjo okuvunda.
Ekikalu-Ebisaanyizo by’amasannyalaze eby’embeera:Okukyusa amasannyalaze ag’amazzi ne gassaamu ebintu ebikalu (polymers oba ceramics) kimalawo ddala omuliro. Naye, ebirungo ebigumu bifuna okusoomoozebwa: okukendeera kw’obutambuzi bw’amasannyalaze ku bbugumu erya bulijjo, okukwatagana obubi n’obusannyalazo, n’okuzirika. Tekinologiya alaga ekisuubizo naye tannaba kukwatagana na nkola ya nkola za mazzi.
Electrolytes eziri waggulu-Okugatta:Okukozesa 3-5 molar salt concentrations mu kifo ky’omutindo gwa 1 molar kikyusa ensengekera y’amasannyalaze. Mu nsengekera ezikuŋŋaanyiziddwa ennyo, molekyo z’ekizimbulukusa entono zisigala nga tezisibiddwa, ne zikendeeza omuliro n’okulongoosa obutebenkevu. LIFSI (lithium bis(fluorosulfonyl)imide) mu nsengeka ng’ezo ezze eraga obukuumi obulungi ate nga zikuuma omulimu omulungi.
Enkyukakyuka mu katale n'okukulaakulana .
Akatale k’amasannyalaze kafuna okugaziwa okw’amangu. Akatale ka Lithium Battery Electrolyte kaali ku buwumbi bwa ddoola 5.8 mu 2025 era nga kasuubirwa okutuuka ku buwumbi bwa ddoola 18.3 omwaka 2035 we gunaatuukira, nga kino kiraga nti buli mwaka okukula kwa bitundu 12.2% buli mwaka. Okukula kuno okusinga kuva ku kwettanira mmotoka ez’amasannyalaze n’okuteeka giriri-okuteeka okutereka amaanyi mu bipimo.
Asia Pacific efuga okufulumya n’okukozesa ebintu, ng’ekola ebitundu nga 35% ku katale k’ensi yonna. China naddala ezimbye obusobozi obw’amaanyi obw’okukola amasannyalaze okusobola okuwagira amakolero gaayo ag’omunda mu ggwanga. Kkampuni nga Guangzhou Tinci Materials Technology ne Tekinologiya wa Shenzhen Capchem bye bikulembeddemu okugabira ensi yonna.
Ekitundu ky’emmotoka kivuga obwetaavu-amasannyalaze kati gakozesa bbaatule nnyingi okusinga ebyuma ebikozesebwa mu bulamu obwa bulijjo, okudda emabega wadde emyaka etaano egiyise. Buli EV Battery Pack erimu liita z’amasannyalaze eziwerako, era okutunda kwa EV mu nsi yonna kwasukka yuniti obukadde 14 mu 2023. Okussa essira ku mmotoka kuno kunyigiriza okunoonyereza eri amasannyalaze agalongoosebwa okusobola okufuna obulamu obuwanvu n’okukola ebbugumu erigazi okusinga amaanyi agasinga obunene.
Emitendera egigenda givaayo mu nkulaakulana y’amasannyalaze .
Endagiriro z’okunoonyereza ezisembyeyo ziraga ekifo ennimiro gy’egenda. Ekitundu ekimu ekisuubiza kiri mu kitundu waggulu-Ebisengejja eby’amasannyalaze (LHCEs). Enkola zino zikozesa ekizimbulukusa ekitono eky’ebbeeyi ekirimu fluorine okukola embeera y’ekitundu erimu ebirungo ebingi okwetoloola omunnyo gwa lithium, olwo ne kikendeeza ku kino n’ekintu ekiyitibwa cosolvent eky’ebbeeyi entono, ekitaliimu. Ekyavaamu kigatta emigaso gy’enkola z’okukung’aanyizibwa eza waggulu-ezisinga okusajjuka n’obuzito.
Omuze omulala guzingiramu okutunga layeri ya SEI okuyita mu bikozesebwa eby’amasannyalaze (electrolyte additives). Ebitundu ebitono (1-5%) eby’ebirungo ebitongole bisobola okufuga ennyo ebikola ku ngulu w’obusannyalazo. Okugeza, vinylene carbonate, esinga kuvunda okukola firimu ya SEI esinga okubeera ennywevu. Abanoonyereza mu laabu za bbaatule ezikulembera kati bulijjo bakebera ebikumi n’ebikumi by’ebirungo ebiyinza okugatta nga bakozesa kemiko y’okubalirira nga tebannagatta bantu abasinga okusuubiza.
Byonna-Battery z'amawanga ezikaluba-ekiikirira okuva ku tekinologiya aliwo kati. Toyota, Samsung, ne Quantumscape ze zimu ku kkampuni ezissa ssente ennyingi mu byuma ebigumu. Singa obuwanguzi, enkola zino ziyinza okuwa densite z’amasoboza waggulu ebitundu 50% okusinga lithium eriwo kati-ion ate nga zimalawo akabi k’omuliro. Naye, okusoomoozebwa okw’ekikugu okwetoloola okutebenkera kw’enkolagana n’okukola ku mutendera kusigala nga tekugonjoddwa.
Electrolytes for sodium-Bttery za ion .
Obuwanguzi bwa Lithium bulina abanoonyereza nga bakozesa enkola ezifaanagana ku bbaatule za sodium-ion. Sodium mungi nnyo ate nga ya buseere okusinga lithium, ekifuula sodium-enkola za ion ezisikiriza okutereka okutali kwa kukyukakyuka awali obuzito obutono. Amawulire amalungi: Ebiwujjo bingi eby’obutonde ebyakolebwa ku nkola za lithium bikola bulungi ne sodium.
Okusoomoozebwa kwawukana katono. Sodium ion zisinga lithium ions, nga zikosa eby’entambula n’okutondebwa kwa SEI. Electrolytes zeetaaga okutereeza okusobola okusikiriza enjawulo zino. Ester-ebiziyiza ebisinziira ku (nga ethyl acetate oba methyl propionate) oluusi bikola bulungi ne sodium okusinga kaboneti-ebisinziira ku ebyo bikola.
Sodium ey’ettunzi-Eyoyibu okuva mu kkampuni nga CATL kati zikozesa ebirungo ebikola amasannyalaze ag’obutonde ebifaanagana ne lithium-enkola za ion, mu ngeri entuufu sodium hexafluorophosphate (NAPF₆) mu bitabulwa bya kaboni. Tekinologiya tannaba kukwatagana na lithium-okukola omulimu, naye ku nkola nga okutereka enjuba mu maka, "kirungi ekimala" ku ssente entono kiyinza okuba "ekisinga obulungi."
Omulimu gw’ebbugumu .
Organic electrolytes zirwana ku bbugumu erisukkiridde. Wansi -20℃, viscosity yeeyongera era entambula ya lithium-ion ekendeera nnyo. Above 60℃, okuvunda reactions kwanguyira era obulamu bwa bbaatule bubonaabona.
Ether-Okutwalira awamu amasannyalaze agasinziira ku bbugumu okusinga kaboneti-okusinziira ku bisannyalazo, wadde nga gasaddaaka obutebenkevu obumu obwa vvulovumenti. Okunoonyereza okwafulumizibwa mu 2024 kwalaga sodium-battery z’ebyuma ezikola ku -40℃nga tukozesa ether electrolytes ezikoleddwa obulungi. Ekisumuluzo kyali kizingiramu okutebenkeza ensengekera y’okuziyiza-engeri molekyo z’ekizimbulukusa gye zisengekamu okwetoloola ion-okukuuma okutambula kwa ion ne bwe kiba nga kinnyogovu.
Ku kukozesa okw’ebbugumu eringi-, ethers ezirimu fluorine ne phosphate esters ziwa obutebenkevu obulungi okusinga kaboni eza mutindo. Okusaba kw’amagye n’eby’omu bbanga oluusi kulaga nti amasannyalaze gano ag’enjawulo gali ga ssente nnyingi.
Okusukka lithium-ion: ebirungo ebiziyiza obutonde mu nkola endala .
Ebirungo ebikozesa amasannyalaze (organic electrolytes) birabika mu kemiko za bbaatule okusukka lithium-ion. Lithium-battery za sulfur, mu ndowooza ezigaba amaanyi g’amasoboza aga waggulu ennyo, zeetaaga amasannyalaze agaziyiza okusaanuuka kwa polysulfide. Abanoonyereza bakoze ether specialized ether-based electrolytes with additives nga lithium nitrate okukola ku kino.
Battery za organic flow zikozesa ebirungo ebisaanuuse nga ekintu ekikola okusinga obusannyalazo obugumu. Enkola zino zitambula nga ziyita mu bbaatule, ne zisobozesa obusobozi bw’amasoboza okugerageranya nga bwe buli ku bifulumizibwa mu maanyi. Quinones, viologens, ne tempo derivatives ezisaanuuse mu aqueous oba organic electrolytes ziraga okusuubiza ku grid-okutereka ebipimo.
Battery za zinc-Oluusi zikozesa ebirungo ebiziyiza obutonde (organic electrolytes) okuziyiza okutondebwa kwa zinki dendrite. Battery za magnesium-okusinga mu mitendera gy’okunoonyereza-ebyetaago eby’enjawulo eby’amasannyalaze kubanga magnesium tekola layeri ya passivating nga lithium bw’ekola.
Ebibuuzo ebitera okubuuzibwa .
Lwaki tetusobola kukozesa mazzi nga electrolyte mu lithium batteries?
Amazzi gavunda okuyita mu kusengejja amasannyalaze ku vvulovumenti ezisukka 1.23V, ne zikola ggaasi za haidrojeni ne okisigyeni. Battery za lithium-zikola ku 3.7-4.2V, nga zisukka nnyo amazzi agatebenkedde. Ebiziyiza ebiramu bisigala nga binywevu ku vvulovumenti zino eza waggulu, ekisobozesa okutereka amaanyi amangi ku buli yuniti y’obuzito.
Kiki ekifuula ebirungo ebiziyiza omuliro (organic electrolytes) okusobola okukwata omuliro?
Ebiziyiza ebisinga ebiramu ebikozesebwa mu bbaatule-kabona, ethers, esters-biyunga kaboni-ebiyungo bya hayidirojeni ebikola amangu oxidize mu kubeerawo kwa okisigyeni n’ebbugumu. Battery bw’eyingira mu thermal runaway, ebbugumu ery’omunda liyinza okusukka 150℃, mu kifo ekyo ebiwunyiriza bino ebikuma omuliro. Okubeerawo kw’eminnyo gya lithium n’ebintu ebikozesebwa mu kukola ebyuma ebikozesebwa (reactive electrode materials) kyanguyiza okwokya oluvannyuma lw’okutandika.
Electrolytes ez’obutonde zimala bbanga ki mu bbaatule?
Okuvunda kw’amasannyalaze kussa ekkomo ku bulamu bwa bbaatule okutuuka ku 1000-2000 charge cycles mu kukozesa abakozesa, oba emyaka 8-10 mu mmotoka ez’amasannyalaze. Ensengekera z’okuvunda zibeerawo obutasalako ku bitundu by’obusannyalazo, nga zirya electrolyte n’okukola layers eziziyiza. Ebbugumu, emiwendo gy’okucaajinga, n’obuwanvu bwa vvulovumenti byonna bikosa enkozesa y’okuvunda kw’embiro (degradation speed-gentler usage) byongera ku bulamu.
Electrolytes ez’obutonde zisobola okuddamu okukozesebwa?
Enkola z’okuddamu okukola kati zisinga kutunuulira kuzzaawo byuma bya muwendo nga lithium, cobalt, ne nickel okuva mu electrodes. Electrolyte etera okwokya oba okusaanyizibwawo eddagala mu kiseera ky’okuddamu okukola hydrometallurgical. Enkola ezimu empya zigezaako okuzzaawo n’okulongoosa ebitundu by’amasannyalaze, naye kino tekinnaba kuvuganya mu by’enfuna n’okufulumya amasannyalaze amapya okuva mu masanyalaze.
Electrolyte eya organic ekiikirira emu ku tekinologiya oyo akola obulungi ekimala nga ebirala birwana okubusengula, ne bwe biba nga bimanyiddwa. Enkola ennywevu-State esuubiza obukuumi obulungi, era enkola z’amazzi ziwa omuwendo omutono, naye mu kiseera kino amasannyalaze ag’amazzi aga organic liquid electrolytes gawa bbalansi esinga obulungi ey’omulimu, amaanyi g’amaanyi, n’okukola. For the foreseeable future, buli lithium-battery ekola amaanyi gaffe, laptops, ne vehicles zijja kubaamu milliliters eziwerako eza carbon-based ionic conductors nga zikola omulimu gwabwe omusirifu, omukulu.
