Tus nqi tag nrho hauv 18 vib nas this? ! Tsis muaj kev txhawj xeeb txog kev tawm hauv tsev thiab roj teeb ...

Cov xov tooj ntawm tes, khoos phis tawj, ntsiav tshuaj, thiab lwm yam uas siv cov roj teeb ua lub zog tau dhau los ua ib feem ntawm peb lub neej, thiab ntau thiab ntau tus neeg pib raug kev txom nyem los ntawm "kev ntxhov siab ntawm hluav taws xob", tib lub sijhawm, qhov nrov nrov ntawm lub zog tshiab muaj. ua rau nws nyuaj rau tib neeg kom them cov roj teeb ntev - sai dua! Them lub roj teeb sai me ntsis! Qhov no tau dhau los ua qhov kev xav tau ntawm txhua tus.

Qhov kev xav ntawd yuav tshwm sim sai sai no. Tsis ntev los no, pab pawg ntawm Song Li, tus xibfwb ntawm National Synchrotron Radiation Laboratory ntawm University of Science thiab Technology ntawm Tuam Tshoj, tau tsim lub roj teeb uas muaj peev xwm them sai sai.

 

Niaj hnub no peb yuav tham ntau ntxiv txog qhov kev tshawb fawb no.

 

Lithium-ion roj teeb yog ib qho kev lees paub dav siv zog cia khoom. Nrog rau qhov zoo ntawm lub zog ntom ntom thiab kev ua haujlwm ntau ntau, lithium-ion roj teeb tau nyob ntau ntawm cov roj teeb ua lag luam. Txawm li cas los xij, cov organic electrolyte siv muaj qee yam kev puas tsuaj rau tib neeg lub cev, thiab qhov tsis txaus ntawm lithium cov peev txheej yuav ua rau lub lag luam roj teeb tsis txaus rau yav tom ntej.

 

Lub roj teeb zinc-ion, raws li cov txuj ci tshiab hauv kev khaws cia lub zog, tsis tsuas yog muaj lub zog theoretical siab ceev, tab sis kuj muaj cov dej tsis muaj tshuaj lom electrolyte, ua kom muaj kev nyab xeeb thiab siv tau zoo thiab siv tau. Tsis tas li ntawd, pheej yig thiab nplua nuj zinc cov peev txheej kuj txo qis tus nqi ntawm kev siv roj teeb, xav tias yuav dhau los ua lub peev xwm hloov cov roj teeb lithium-ion yav tom ntej.

Txawm hais tias muaj ntau qhov sib txawv ntawm kev siv cov khoom siv, kev ua haujlwm ntawm zinc-ion roj teeb thiab lithium-ion roj teeb hauv cov nqi thiab cov txheej txheem tawm yog qhov zoo sib xws.

 

Cov khoom siv cathode ntawm lub roj teeb feem ntau yog txheej: thaum lub sij hawm tso tawm ntawm lub roj teeb, lithium ions (los yog zinc ions) yuav embedded rau hauv txheej ntawm cov khoom cathode rau cia; Thaum lub sij hawm them nyiaj ntawm lub roj teeb, lithium ions (los yog zinc ions) yuav khiav tawm ntawm cov khoom zoo thiab rov qab mus rau qhov tsis zoo electrode.

Feem ntau, lub hauv paus ntsiab lus ua haujlwm ntawm lub roj teeb yog txheej txheem ntawm ion tsiv teb tsaws thiab hloov hluav taws xob.

Lub hauv paus ntsiab lus ntawm kev them nyiaj ceev ceev

Yog li hauv qhov kev tshawb fawb tshawb fawb no, lub roj teeb them ceev ua tiav li cas?

 

1. Kev nthuav dav ion thauj raws

 

Raws li tau hais los saum no, cov txheej txheem them nyiaj thiab tso tawm ntawm cov roj teeb zinc-ion yog txheej txheem ntawm kev hloov pauv ion txuas ntxiv. Yog tias koj xav khaws cov roj teeb ntau npaum li sai tau hauv lub sijhawm luv luv, koj yuav tsum tsim qhov chaw cia loj rau zinc ions.

 

Ua ntej, cov kws tshawb fawb tau tsom mus rau txheej txheej vanadium pentoxide cov ntaub ntawv nrog cov qauv kho kom haum. Cov khoom siv vanadium pentoxide txheej txheej yog txheej txheem zoo li nws tau teem los ntawm ntau daim phiaj sib luag. Txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau ntxiv Qhov no yog txhawm rau ntxiv qee tus ncej ntawm cov txheej txheem ua ntej txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhaws).

 

Nrog kev txhawb nqa ntawm ammonium ions, zinc ions tuaj yeem yooj yim txav mus rau hauv cov khoom siv hluav taws xob zoo, thiab qhov chaw interlayer loj tuaj yeem txhim kho lub zog cia ntawm lub roj teeb.

 

 

2. Los ntawm kev kho orbital txoj hauj lwm mus rau accelerating electron hloov

Nws yog ib qho tseem ceeb kom paub tias lub zog cia txheej txheem ntawm lub roj teeb yog ze ze rau ion migration thiab electron hloov. Thaum zinc ions nkag mus rau hauv cathode cov ntaub ntawv txheej rau cia, qee cov electrons tseem yuav raug xa mus rau cov khoom siv cathode kom tswj tau qhov nqi tag nrho. Yog li ntawd, nws tseem ceeb heev kom kawm txog kev cuam tshuam ntawm intercalated ions ntawm cov qauv hluav taws xob ntawm cov ntaub ntawv txheej.

 

Txawm li cas los xij, cov qauv kev sim cov qauv yog qhov nyuaj rau kev tshawb nrhiav cov qauv hauv atomic thiab hluav taws xob hauv cov khoom siv. Yog li ntawd, ntau cov txheej txheem synchrotron radiation characterization yog xav tau rau kev kuaj pom. Yooj yim muab tso, synchrotron hluav taws xob thev naus laus zis tuaj yeem nkag siab tias yog ib qho kev txhim kho ntawm "super microscope", siv nws lub siab ci thiab dav band yam ntxwv kom pom cov qauv sab hauv ntawm cov teeb meem.

Siv cov txheej txheem no, cov kws tshawb fawb tau tshawb xyuas qhov kev hloov pauv ntawm atomic orbital txoj hauj lwm nyob rau hauv cov khoom siv vanadium pentaoxide tom qab tso ntawm ammonium ion pillars ntawm cov khaubncaws sab nraud povtseg thiab cov evolution thim rov qab ntawm tus txheej txheem ntawm tus nqi thiab tawm.

 

Ntawm no peb xub qhia txog lub ntsiab lus ntawm cov qauv hluav taws xob.

 

Rau cov khoom nrog extranuclear electrons, lawv cov electrons tsis cluttered, tab sis teem nyob rau hauv orbits. Ntxiv mus, cov electrons yeej ib txwm nyob hauv qis zog orbitals ua ntej, uas yog, lub nuclei ntawm qhov chaw, teem los ntawm sab hauv tawm.

 

Rau vanadium, nws cov valence electron kev npaj yog qhia hauv qab no, nrog tsib valence electrons nyob rau hauv txheej txheej. Hauv vanadium pentoxide, tag nrho tsib lub electrons yog siv los txuas nrog oxygen atoms. Lub sijhawm no, 3d orbital ntawm vanadium yog qhov khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob.

 

 

3. Cov kev cai dual ntawm cov qauv siv lead ua thiab cov qauv hluav taws xob ua rau kev them nyiaj ceev thiab lub voj voog ruaj khov tuaj rau hauv kev muaj tiag

Thaum siv cov khoom siv cathode tshiab no, lub roj teeb zn-ion ua tiav lub peev xwm ntawm 101mAh / g ntawm qhov ceev tam sim no ntawm 200C, thiab tus nqi tsuas yog siv sijhawm 18s. Nyob rau tib lub sijhawm, cov dej electrolyte kuj ua kom muaj kev nyab xeeb ntawm cov txheej txheem ncig thiab txo cov pa phem rau ib puag ncig.

 

Nyob rau hauv daim ntawv no, txheej txheej thiab orbital txoj hauj lwm lub xeev ntawm cov ntaub ntawv txheej yog tsim thiab tswj los ntawm cov siv lead ua qauv thiab hluav taws xob qauv ntawm cov ntaub ntawv. Nyob rau tib lub sij hawm, ua ke nrog cov advanced synchrotron radiation characterization txhais tau tias, cov evolution ntawm cov ntaub ntawv qauv yog ntau intuitive thiab meej, thiaj li hais tias cov khoom zoo electrode nrog ceev ceev cov yam ntxwv yog ua tau.

 

Tej zaum nyob rau yav tom ntej, cov ntaub ntawv no tuaj yeem siv rau hauv cov khoom siv hluav taws xob, thiab txawm tias kev thauj mus los rau pej xeem. Qhov kev txo qis hauv lub sijhawm them nyiaj tuaj yeem ua rau tib neeg lub neej zoo dua thiab yooj yim dua; Cov khoom siv roj teeb muaj kev nyab xeeb thiab huv si tuaj yeem txo lub nra ntawm ib puag ncig. Ntseeg tias technology yuav ua rau hnub ntawd tsis nyob deb.