Maaddada ternary ee nickel-cobalt-manganese waa mid ka mid ah walxaha ugu muhiimsan ee baytariyada hadda jira. Saddexda walxood waxay leeyihiin macnayaal kala duwan oo loogu talagalay walxaha cathode, oo ay ka mid yihiin curiyaha nikelku waa inuu hagaajiyo awoodda batteriga. Mar kasta oo ay ka kooban tahay nikkelku, waa badnaanta awoodda gaarka ah ee walxaha. NCM811 waxa ay leedahay awood gaar ah oo ah 200mAh/g iyo meel sii dayn ah oo qiyaastii ah 3.8V, kaas oo laga samayn karo batari cufnaanta tamarta sare leh. Si kastaba ha ahaatee, dhibaatada batteriga NCM811 waa badbaado liidata iyo burburka nolosha meertada degdega ah. Maxay yihiin sababaha saameeya meertada nolosha iyo badbaadada? Sidee loo xalliyaa dhibaatadan? Kuwa soo socda waa falanqayn qotodheer:

NCM811 waxa laga dhigay baytari badhanka (NCM811/Li) iyo baytari xidhmo dabacsan (NCM811/graphite), iyo awoodiisa garaam iyo batari buuxa ayaa la tijaabiyey siday u kala horreeyaan. Bateriga baakadka jilicsan ayaa loo qaybiyay afar kooxood oo tijaabo ah hal arrin. Doorsoomiyaha halbeeggu waxa uu ahaa danab gooyay, kaas oo ahaa 4.1V, 4.2V, 4.3V iyo 4.4V, siday u kala horreeyaan. Marka hore, batteriga laba jeer baa lagu wareegay 0.05c ka dibna 0.2C at 30 ℃. Kadib 200 wareeg, qalooca wareegga batteriga baakidh jilicsan ayaa lagu muujiyay sawirka hoose:

Waxaa laga arki karaa shaxanka in marka la eego xaaladda koronto-joojin sare, awoodda garaam ee walxaha nool iyo batari labaduba ay sarreeyaan, laakiin awoodda garaam ee baytari iyo walxo sidoo kale si dhakhso ah u qudhunto. Taa lidkeeda, marka la eego korantada goynta hoose (ka hooseeya 4.2V), awoodda baytarigu si tartiib ah ayay hoos u dhacaysaa, nolosha meertoduna waa dheer tahay.

Tijaabadan, falcelinta parasitic-ka ayaa lagu daraaseeyay calorimetry isothermal iyo qaab-dhismeedka iyo qaab-dhismeedka qaab-dhismeedka ee walxaha cathode inta lagu jiro habka baaskiilka ayaa lagu bartay XRD iyo SEM. Gabagabadiina waa sidan:

Sawirka

Marka hore, isbeddelka qaabdhismeedku maaha sababta ugu weyn ee hoos u dhaca nolosha wareegga batteriga

Natiijooyinka XRD iyo SEM waxay muujiyeen inaysan jirin farqi muuqda oo u dhexeeya qaab-dhismeedka qaybaha iyo qaab-dhismeedka atomikada ee batteriga leh koronto iyo koronto-goyn ah 4.1V, 4.2V, 4.3V iyo 4.4V ka dib wareegyada 200 ee 0.2c. Sidaa darteed, isbeddelka qaab dhismeedka degdega ah ee walxaha nool inta lagu jiro dallacaadda iyo soo saarista maaha sababta ugu weyn ee hoos u dhaca nolosha wareegga batteriga. Taa baddalkeeda, falcelinta parasitic-ka ee is-dhexgalka u dhexeeya elektrolytka iyo qaybaha aadka u firfircoon ee walxaha nool ee ku jira gobolka delithium ayaa ah sababta ugu weyn ee hoos u dhaca nolosha batteriga ee wareegga korantada ee 4.2V.

(1) SEM

Sawirka

Sawirka

A1 iyo A2 waa sawirada SEM ee batteriga oo aan wareeg lahayn. B ~ E waa sawirada SEM ee alaabta nool ee korantada togan ka dib 200 wareeg ah oo ka hooseeya xaalad 0.5C iyo ku dallaca danabka goynta ee 4.1V / 4.2V / 4.3V / 4.4V, siday u kala horreeyaan. Dhinaca bidix waa sawirka mikroskoob elektaroonig ah oo hoos yimaadda weynaynta hoose, dhinaca midigna waa sawirka mikroskoob ee elektarooniga ah ee hoos yimaad weynaynta sare. Sida ka muuqata shaxanka sare, ma jiro farqi weyn oo u dhexeeya qaab-dhismeedka qayb ka mid ah iyo heerka dillaaca ee u dhexeeya baytariga wareegaya iyo batteriga aan wareegayn.

(2) Sawirada XRD

Sida ka muuqata sawirka kore, ma jiro farqi muuqda oo u dhexeeya shanta sare ee qaabka iyo booska.

(3) Beddelka cabbirrada shafka ah

Sawirka

Sida shaxda ka muuqata qodobbada soo socda:

1. Joogtada shafka ah ee taarikada polar-ka ee aan baaskiilka wadin waxay la socdaan kuwa NCM811 budada nool. Marka korantada goynta meertadu ay tahay 4.1V, joogtaynta xadhiggu aad ugama duwana labadii hore, dhidibka C-na wax yar ayuu kordhaa. Joogtada shabagga ee dhidibka C-da ee leh 4.2V, 4.3V iyo 4.4V aad ugama duwana kuwa 4.1V (0.004 angms), halka xogta dhidibka A-da ay aad uga duwan tahay.

2. Ma jirin wax isbedel ah oo ku yimid nuxurka Ni ee shanta kooxood.

3. Taarikada Polar oo leh koronto wareeg ah oo ah 4.1V at 44.5° waxay muujinayaan FWHM weyn, halka kooxaha kale ee kantaroolku ay muujinayaan FWHM la mid ah.

Habka dallacaadda iyo dallacaadda batteriga, dhidibka C waxa uu leeyahay hoos u dhac weyn iyo ballaarin. Hoos u dhigista nolosha meertada batteriga ee tamarta sare ma aha sababtoo ah isbeddelka qaab dhismeedka walxaha nool. Sidaa darteed, saddexda dhibcood ee sare waxay xaqiijinayaan in isbeddelka qaabdhismeedku aanu ahayn sababta ugu weyn ee hoos u dhaca nolosha wareegga batteriga.

Sawirka

Marka labaad, nolosha meertada ee batteriga NCM811 waxay la xiriirtaa falcelinta parasitic ee batteriga

NCM811 iyo graphite waxa laga sameeyaa unugyo xidhmo dabacsan iyadoo la isticmaalayo electrolytes kala duwan. Taas bedelkeeda, 2% VC iyo PES211 ayaa lagu daray electrolyte ee labada kooxood, siday u kala horreeyaan, iyo heerka dayactirka awoodda labada kooxood ayaa muujiyay farqi weyn ka dib wareegga batteriga.

Sawirka

Marka loo eego shaxanka kore, marka danabka goynta ee batteriga leh 2% VC uu yahay 4.1V, 4.2V, 4.3V iyo 4.4V, heerka dayactirka awoodda batteriga ka dib wareegyada 70 waa 98%, 98%, 91 % iyo 88%, siday u kala horreeyaan. Ka dib 40 wareegyo oo keliya, heerka dayactirka awoodda batteriga ee lagu daray PES211 ayaa hoos u dhacay 91%, 82%, 82%, 74%. Muhiimad ahaan, tijaabooyinkii hore, nolosha wareegga batteriga ee NCM424/ graphite iyo NCM111/ nidaamyada garaafyada ee PES211 ayaa ka fiicnaa tii 2% VC. Tani waxay keenaysaa in loo maleeyo in waxyaabaha lagu daro korantada ay saameyn weyn ku leeyihiin nolosha batteriga ee nidaamyada nikkel-sare.

Waxa kale oo laga arki karaa xogta kor ku xusan in nolosha meertada ah ee ku hoos jira danab sare ay aad uga xun tahay tan hooseysa. Iyadoo loo marayo shaqada ku habboon ee polarization, △ V iyo waqtiyada wareegga, tiradan soo socota ayaa la heli karaa:

Sawirka

Waxaa la arki karaa in batteriga △V uu yar yahay marka uu baaskiilku ku socdo koronto yar oo goyn ah, laakiin marka korantadu kor u kacdo 4.3V, △V aad ayuu u korayaa oo batteriga ayaa kor u kaca, kaas oo si weyn u saameeya nolosha batteriga. Waxa kale oo laga arki karaa jaantuska in heerka △V ee isbeddelka VC iyo PES211 ay kala duwan yihiin, taas oo sii xaqiijinaysa in heerka iyo xawaraha batariyada batteriga ay ka duwan yihiin waxyaabaha lagu daro korantada ee kala duwan.

Isothermal microcalorimetry ayaa loo isticmaalay in lagu falanqeeyo itimaalka falcelinta dulin ee batteriga. Halbeegyada sida polarization, entropy iyo socodka kulaylka dulin ayaa la soo saaray si loo sameeyo xidhiidh shaqaynaya rSOC, sida ku cad shaxanka hoose:

Sawirka

Kor 4.2V, socodka kulaylka dulin ayaa lagu muujiyay inuu si lama filaan ah u kordho, sababtoo ah aadka u sarreeya ee delithium anode wuxuu si fudud ula falgalaa korantada sare. Tani waxay sidoo kale sharraxaysaa sababta sare u qaadista korantada iyo soo saarista, sida dhakhsaha badan ee dayactirka batteriga hoos u dhaco.

Sawirka

Iii. NCM811 waxay leedahay ammaan xumo

Marka la eego xaalada sii kordheysa heerkulka deegaanka, falcelinta falcelinta NCM811 ee ku dallacaadda gobolka ee korantada ayaa aad uga weyn kan NCM111. Sidaa darteed, isticmaalka NCM811 soo saarista batteriga way adagtahay in laga gudbo shahaadada qasabka ah ee qaranka.

Sawirka

Shaxanku waa jaantuska is-kuleyliyaha NCM811 iyo NCM111 inta u dhaxaysa 70℃ iyo 350℃. Jaantusku wuxuu muujinayaa in NCM811 uu bilaabo kuleylku qiyaastii 105 ℃, halka NCM111 aanu ilaa 200 ℃. NCM811 waxay leedahay kulaylka 1 ℃/daqiiqo laga bilaabo 200 ℃, halka NCM111 ay leedahay kulaylka 0.05℃/min, taas oo macnaheedu yahay in NCM811/ nidaamka garaafyada ay adagtahay in la helo shahaadada badbaadada ee qasabka ah.

Maaddada nool ee nikkel-ka sare waxay ku xidhan tahay inay noqoto shayga ugu muhiimsan ee baytariga cufnaanta tamarta sare mustaqbalka. Sidee loo xalliyaa dhibaatada suuska degdega ah ee nolosha batteriga NCM811? Marka hore, dusha walxaha NCM811 waa la bedelay si loo horumariyo waxqabadkeeda. Midda labaad waa in la isticmaalo electrolyte-ka kaas oo yarayn kara falcelinta dulin ee labada, si ay u wanaajiso meertada nolosha iyo badbaadada. Sawirka

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