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Nyumbani / blogu / Wahandisi wameunda kitenganishi kinachoweka utulivu wa elektroliti za gesi ili kufanya betri zenye joto la chini kuwa salama zaidi. Wahandisi wameunda kitenganishi kinachoweka utulivu wa elektroliti za gesi ili kufanya betri zenye joto la chini kuwa salama zaidi. Kulingana na ripoti za vyombo vya habari vya kigeni, wahandisi wa nano katika Chuo Kikuu cha California San Diego wameunda kitenganishi cha betri ambacho kinaweza kufanya kama kizuizi kati ya cathode na anode ili kuzuia elektroliti ya gesi kwenye betri kutoka kwa mvuke. Diaphragm mpya huzuia shinikizo la ndani la dhoruba kutoka kwa kukusanya, na hivyo kuzuia betri kutoka kwa uvimbe na kulipuka.
Kiongozi wa utafiti, Zheng Chen, profesa wa nanoengineering katika Shule ya Uhandisi ya Jacobs katika Chuo Kikuu cha California, San Diego, alisema: "Kwa kunasa molekuli za gesi, utando huo unaweza kufanya kazi kama kiimarishaji cha elektroliti tete."
Kitenganishi kipya kinaweza kuboresha utendaji wa betri katika halijoto ya chini kabisa. Seli ya betri inayotumia diaphragm inaweza kufanya kazi kwa minus 40°C, na uwezo wake unaweza kuwa hadi saa 500 milliampere kwa kila gramu, huku betri ya diaphragm ya kibiashara ikiwa na nguvu karibu sifuri katika hali hii. Watafiti wanasema kwamba hata ikiwa itaachwa bila kutumika kwa miezi miwili, uwezo wa seli ya betri bado uko juu. Utendaji huu unaonyesha kuwa diaphragm pia inaweza kuongeza muda wa kuhifadhi. Ugunduzi huu unaruhusu watafiti kufikia lengo lao zaidi: kuzalisha betri zinazoweza kutoa umeme kwa magari katika mazingira ya barafu, kama vile vyombo vya anga, setilaiti, na meli za kina kirefu cha bahari.
Utafiti huu unatokana na utafiti katika maabara ya Ying Shirley Meng, profesa wa nanoengineering katika Chuo Kikuu cha California, San Diego. Utafiti huu hutumia elektroliti ya gesi iliyoyeyuka kutengeneza betri inayoweza kudumisha utendakazi mzuri katika mazingira ukiondoa 60°C kwa mara ya kwanza. Miongoni mwao, elektroliti ya gesi iliyoyeyuka ni gesi ambayo imeyeyushwa kwa kutumia shinikizo na inakabiliwa zaidi na joto la chini kuliko elektroliti za kioevu za jadi.
Lakini aina hii ya electrolyte ina kasoro; ni rahisi kubadili kutoka kioevu hadi gesi. Chen alisema: "Tatizo hili ndilo suala kubwa zaidi la usalama kwa electrolyte hii." Shinikizo linahitaji kuongezwa ili kufupisha molekuli za kioevu na kuweka elektroliti katika hali ya kioevu ili kutumia elektroliti.
Maabara ya Chen ilishirikiana na Meng na Tod Pascal, profesa wa nanoengineering katika Chuo Kikuu cha California, San Diego, kutatua tatizo hili. Kwa kuchanganya utaalam wa wataalam wa kompyuta kama vile Pascal na watafiti kama vile Chen na Meng, mbinu imeundwa ili kuyeyusha elektroliti iliyotiwa mvuke bila kutumia shinikizo nyingi haraka. Wafanyakazi waliotajwa hapo juu ni washirika wa Kituo cha Sayansi ya Utafiti na Uhandisi (MRSEC) cha Chuo Kikuu cha California, San Diego.
Njia hii inatokana na hali halisi ambapo molekuli za gesi hujibana yenyewe zinaponaswa katika nafasi ndogo za mizani ya nano. Jambo hili linaitwa condensation ya capillary, ambayo inaweza kufanya gesi kuwa kioevu kwa shinikizo la chini. Timu ya utafiti ilitumia hali hii kuunda kitenganishi cha betri ambacho kinaweza kuleta utulivu wa elektroliti katika betri zenye joto la chini sana, elektroliti ya gesi iliyoyeyushwa iliyotengenezwa kwa gesi ya fluoromethane. Watafiti walitumia nyenzo ya fuwele yenye vinyweleo inayoitwa mfumo wa kikaboni wa chuma (MOF) kuunda utando huo. Jambo la kipekee kuhusu MOF ni kwamba imejaa vinyweleo vidogo vidogo, ambavyo vinaweza kunasa molekuli za gesi ya fluoromethane na kuzibana kwa shinikizo la chini kiasi. Kwa mfano, fluoromethane kawaida hupungua kwa minus 30 ° C na ina nguvu ya 118 psi; lakini ikiwa MOF inatumiwa, shinikizo la condensation ya porous kwa joto sawa ni psi 11 tu.
Chen alisema: "MOF hii inapunguza kwa kiasi kikubwa shinikizo linalohitajika kwa electrolyte kufanya kazi. Kwa hiyo, betri yetu inaweza kutoa kiasi kikubwa cha uwezo kwa joto la chini bila uharibifu." Watafiti walijaribu kitenganishi chenye msingi wa MOF katika betri ya lithiamu-ion. . Betri ya lithiamu-ion ina cathode ya fluorocarbon na anode ya chuma ya lithiamu. Inaweza kuijaza na elektroliti ya fluoromethane ya gesi kwa shinikizo la ndani la psi 70, chini sana kuliko shinikizo linalohitajika kwa kunyunyiza fluoromethane. Betri bado inaweza kudumisha 57% ya uwezo wake wa halijoto ya chumba kwa minus 40°C. Kwa kulinganisha, kwa joto sawa na shinikizo, nguvu ya betri ya diaphragm ya kibiashara kwa kutumia electrolyte ya gesi iliyo na fluoromethane ni karibu sifuri.
Micropores kulingana na kitenganishi cha MOF ndio ufunguo kwa sababu micropores hizi zinaweza kuweka elektroliti nyingi zaidi kwenye betri hata chini ya shinikizo lililopunguzwa. Diaphragm ya kibiashara ina matundu makubwa na haiwezi kubakiza molekuli za elektroliti za gesi chini ya shinikizo lililopunguzwa. Lakini microporosity sio sababu pekee ya diaphragm inafanya kazi vizuri chini ya hali hizi. Diaphragm iliyoundwa na watafiti pia inaruhusu pores kuunda njia inayoendelea kutoka mwisho mmoja hadi mwingine, na hivyo kuhakikisha kuwa ioni za lithiamu zinaweza kutiririka kwa uhuru kupitia kiwambo. Katika jaribio, upitishaji wa ionic wa betri kwa kutumia diaphragm mpya kwa minus 40 ° C ni mara kumi ya betri inayotumia diaphragm ya kibiashara.
Timu ya Chen kwa sasa inajaribu vitenganishi vinavyotegemea MOF kwenye elektroliti nyingine. Chen alisema: "Tumeona athari zinazofanana. Kwa kutumia MOF hii kama kiimarishaji, molekuli mbalimbali za elektroliti zinaweza kutangazwa ili kuboresha usalama wa betri, ikiwa ni pamoja na betri za jadi za lithiamu zilizo na elektroliti tete."