Imoto kagesi ihamba kancane? IYunivesithi yaseCambridge inikeza indlela entsha yokwelapha

ଲେଖକ: ଆଇଫ୍ଲୋପାୱାର - Soláthraí Stáisiún Cumhachta Inaistrithe

Uma kuqhathaniswa nebanga lempilo yebhethri, abantu bakhathazeke kakhulu ngesikhathi sokushajwa kwezimoto zikagesi, nakuba izimoto eziningi zikagesi ezethulwe eminyakeni yamuva ziye zasekela ukushaja okusheshayo kwemizuzu engu-30-40 (umthamo we-80%), kodwa azikwazi ukuhlangabezana nokulindelwe ngabantu. Njengamanje, ibhethri lamandla e-lithium ion elisetshenziswa ezimotweni zikagesi liyibhethri ye-lithium ion, futhi umkhawulo wesivinini sokushaja webhethri le-lithium ion usekuqoqweni okunegethivu ku-electrode eyinegethivu. Phakathi nenqubo yokushaja, i-Li + ikhishwa ku-electrode eqondile, i-solvent ixazululwa ku-electrolyte, bese isakazwa ebusweni be-electrode engalungile, kanye nesakhiwo sekristalu se-electrode eyi-graphite negative eshumekwe ngemva kwe-solvate.

Phakathi nakho konke ukusabela, ukusabalalisa kwe-solventification kanye ne-Li + ezinhlayiyeni ze-graphite isixhumanisi esikhawulelwe sejubane lokusabela. Uma isivinini sokushaja sishesha kakhulu, i-polarization iyengezwa, futhi i-Li yensimbi idonswa phezu kwe-electrode eyi-graphite negative. Indlela evamile yokuthuthukisa izinto ezingezinhle ze-electrode i-nanofed, ithuthukisa indawo yokuxhumana yezinto ezisebenzayo kanye ne-electrolyte, inciphisa ibanga lokusabalalisa phakathi kwe-Li + entweni esebenzayo, kodwa lokhu futhi kuletha uchungechunge lwezinkinga, njenge-nanoforming Ukuminyana kwe-compact kuyancishiswa, kanye nemiphumela emibi ebangelwa indawo ethize ngokweqile.

U-Kentj.griffith (umbhali wokuqala) kanye no-Clarep.grey wase-University of Cambridge, e-British Cambridge, badabula imikhawulo yokucabanga kwendabuko, kusukela esakhiweni sekristalu, bathola ukuthi uma ama-oxide ensimbi e-Ni no-W esetshenziselwa ukwakha isakhiwo sekristalu esinezinhlangothi ezintathu esifanelekile, singaba ngama-microns Izici zokukhuliswa okuphezulu zitholwa ngosayizi wezinga, kanye nezici zokuqina nokuqina okuphezulu ngesikhathi esisodwa.

Ekuhlolweni, i-Kentj.griffith isebenzisa i-NB ne-W&39;s oxide ukuze ihlanganise i-NB16W555 (njengoba kuboniswe ku-Fig. AC) kanye ne-Nb18W16O93 (njengoba kukhonjisiwe ku-Figure DF eboniswe ku-Figure DF), lapho i-Nb16W5O55 iyisistimu ye-crystalline exhunywe okukodwa, futhi i-crystal yakhiwe nge-engeli evamile.

, Yakha iyunithi yesakhiwo yawo wonke ama-octahedral angu-4x5, njengoba kuboniswe ku-Fig. A. Into ye-NB18W16O93 iwumugqa we-orthogonal, futhi ukwakheka kuboniswa kuMfanekiso D.

Izinto ezimbili ziboniswa emfanekisweni ongezansi, futhi kunezinqubo ezintathu zokusabela phakathi kuka-2.5-1.0V, kanti iplathifomu kagesi icishe ibe ngu-1.

55V, futhi isiteji samandla kagesi sicishe sibe ngu-1.55V, kanti i-Li4TI5O12 (1.55 V) isondele kakhulu, kepha amandla abuyiselekayo we-NB16W5O55 aphakeme kakhulu kunempahla ye-LTO, afinyelela ku-225 mAh / g ngesilinganiso se-C / 5, kanti i-NB16W5O55 ikhombisa ukusebenza kahle kokukhuliswa. 5C.

(i-12min ukuqamba amanga) isengafinyelela ku-171 mAh / g, noma ekukhulisweni okuphezulu kwe-20c (3min) kusengafika ku-148mAh / g. Okubalulekile kwe-NB16W5O55 akukho ekusebenzeni kokukhulisa kuphela, futhi kunamandla aqinile ekusebenzeni komjikelezo. Ngemuva kwemijikelezo engu-250 yezinga le-10C, amandla okubuyisela emuva asafinyelela ku-95%, bese ukukhuliswa kwe-20C kungumjikelezo wezikhathi ezingu-750, ibhethri iyahlehliswa Izinga lokugcinwa kwamandla lisephezulu njenge-95%.

Kodwa-ke, u-Xiaobian ulapha ukusho ukuthi umbhali ulapha, okuyiphuzu elincane, elitholakala ekutholeni ukusebenza kokukhulisa, futhi inqubo yokushaja i-voltage engaguquki iyengezwa phakathi nenqubo yokushaja, futhi ababhali ekutholeni umjikelezo bazokwehlisa inqubo yokushaja kagesi njalo. Sonke siyaqonda ukuthi ukushajwa kwengcindezi eqhubekayo kuhlobene namandla okushaja amabhethri amasha, ikakhulukazi emazingeni aphezulu wokushajwa, kubaluleke kakhulu, ngakho ababhali bangaba bahle kakhulu, futhi umjikelezo osuswa emjikelezweni ulingana nokuncipha Isimo se-SOC sebhethri siwusizo ukuthuthukisa ukusebenza komjikelezo. Kubonakala sengathi abantu bakwamanye amazwe bazoqaphela! I-electrochemical probe ye-NB18W16O93 impahla nayo inhle kakhulu, futhi ipulatifomu yayo ye-voltage ingu-1.

I-67V, ku-C / 5 kanye nezikhathi ze-1C, njengoba isisindo se-Nb18W16O93 sikhulu uma kuqhathaniswa, igremu kufanele ibe ngu-20 mAh / g ngaphansi kunento ye-NB16W5O55, kodwa ingaphezulu Ekukhulisweni okuphezulu, into ye-NB18W16O93 ihle kakhulu ekusebenzeni, futhi amandla angaphansi kuka-150 020mAh angafinyelela ku-150 mAh / 02 mAh. 105 kanye 70 mAh / g at 60C kanye 100C ukukhulisa, okungcono kusukela NB16W5O55 impahla. Ukusebenza kokukhulisa okuhle kakhulu kwenqatshelwe kusukela ku-Li + ephezulu yokusabalalisa i-coefficient yezinto ezimbili. Kusukela kuthebula elingezansi, kungenzeka ukubona ukuthi i-coefficient yokusabalalisa yezinto ezimbili icishe ibe ngu-10-12-10-13m2 / s, ephakeme kakhulu kune-Fast charger staminated titanate (10-16-10-15) Isikhathi esanele ngokuphelele sokuqedela ukusabalalisa ngaphakathi kwezinhlayiya ze-10um diameter, lesi sitatimende se-micro-high singakwazi ukufeza ngisho ne-micrometer ephezulu. isivinini.

Nakuba kuqhathaniswa bendabuko graphite materials, the NB16W55 kanye NB18W16O93 izinto ezimbili abanazo izinzuzo ivolumu igremu kanye yesikhulumi voltage, uma sicabangela ukuminyana compaction, sizothola ukuthi izinto ezimbili ngaphezulu High compact kwabantu ngakho kunenzuzo enkulu kakhulu (njengoba kuboniswe esithombeni esingezansi) kuvolumu yeyunithi (eboniswe ngezansi), kumthamo weyunithi ye-1C, iyunithi ye-5C, iyunithi ye-5C, umthamo weyunithi ye-5C finyelela ku-550ah / L, ngisho nasekukhulisweni kwe-20C Ingafinyelela ku-350AH / L, futhi impahla ye-NB18W16O93 ingafinyelela ku-500ah / L ekukhulisweni kwe-1C, namanje ifinyelela ku-400ah / L ekukhulisweni kwe-20C, futhi umthamo weyunithi we-graphite material / 10ah cishe u-L / 10ah kuphela u-L / 10ah kwesokudla kuphela. akukho umthamo ekukhuliseni okungu-20C. Lesi sitatimende se-NB16W5O55 kanye ne-NB18W16O93 izinto ezimbili azikwazi ukufanisa impahla ye-graphite yendabuko ngesisindo samandla, kodwa kumthamo wamandla wevolumu, sinezinzuzo ezinhle, ikakhulukazi ekukhulisweni okuphezulu, futhi inzuzo icishe ibe namandla. I-Kentj.

UGriffith uthuthukise i-NB16W5O55 kanye ne-NB18W16O93 izinto ezimbili zinama-coefficients okusabalalisa we-Li + aphezulu kakhulu, ukuze ukusebenza okuhle kakhulu kokukhulisa kungafinyelelwa ngosayizi we-micrometer, nakuba lezi zinto ezimbili zingezinhle njengendabuko ngesisindo uma kuqhathaniswa namapulatifomu kagesi. I-graphite material, kodwa izici ze-high-pressure density yangempela zenza lezi zinto ezimbili zibonise inzuzo enkulu yezinto ezibonakalayo ze-graphite kumthamo wamandla wevolumu, futhi impahla inamathemba abanzi esikhathini esizayo. Imfuneko ukwehla kwezindleko).

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