Chii chinonzi Graphite Anode?

A graphite anode ndiyo inegative electrode mu alithium ion bhatiri, yakagadzirwa nekabhoni yakarongwa mumapepa akaiswa anochengeta uye anoburitsa lithium ions panguva yekuchaja nekuburitsa. Inoshanda seyekutanga kutambira zvinhu uko lithium ion inoiswa pakati pemagraphite layers kana bhatiri richichaja, ichiverengera 10-20% yehuremu hwebhatiri.

Kushanda kwegraphite seanode kunobva kuatomu yekuvaka kwayo. Maatomu eCarbon anobatana mumashizha akati sandara, ane hexagonal anonzi graphene layers, akaturikidzana pamusoro peimwe nekupatsanurana kunoita 3.354 angstroms. Weak van der Waals Masimba anobata matinji aya pamwechete-akasimba zvakakwana kuti achengetedze chimiro, asi asina kusimba zvekutendera kuti lithium ion isverere pakati pawo.

Ichi chimiro chakaturikidzana chinogadzira nzira dzechisikigo dzekufamba kweion. Kana bhatiri richichaja, lithium ions inofamba kubva mucathode kuburikidza ne electrolyte uye inozvimisikidza pakati pezvikamu zvegraphite kuburikidza nemaitiro anonzi intercalation. Kupatsanurwa pakati pematanho kunowedzera neinosvika 10% kugarisa maion aya. Kana bhatiri rabuda, maion anobuda mugraphite odzokera kucathode, achiburitsa simba rakachengetwa.

Girafu inoumba zvinodaidzwa nevanoongorora kuti lithium-graphite intercalation compounds (Li-GICs) pamatanho akasiyana. Kana yakwana, anode inosvika pakugadzirwa kweLiC₆-rithium atomu imwe chete pamaatomu ecarbon matanhatu-inomiririra huwandu hwekuchengetedza density graphite inogona kuwanikwa.

Graphite inotonga bhatiri anode zvinhu nekuda kwezvikonzero zvinopfuura kuwanikwa nyore. Kugona kwayo kwekufungidzira kunosvika 372 mAh/g, kuunza kushanda kwakavimbika muzviuru zvemachaji ekutenderera. Zvinonyanya kukosha, graphite inoshanda pane yakaderera electrochemical inokwanisa ye 0.01-0.2 V kupesana neLi/Li⁺, iyo inowedzera mutsauko wemagetsi pakati peanode uye cathode, kushandura zvakananga kune yakakwira simba density musero rebhatiri rakazara.

Iyo inobata inzwi inoshanduka zvinoyevedza. Kusiyana nedzimwe nzira dzinokura zvakanyanya panguva yelithiation, chimiro che graphite chinotora lithium ions nekuzvimba kushoma-kazhinji isingasviki 10%. Uku kugadzikana kwemaitiro kunotsanangura kuti nei graphite anode ichipfuura 1,000 yekuchaja kutenderera nekushomeka kwesimba.

Mutengo unobata basa rekupedzisira. Natural graphite kubva kumabasa emigodhi uye synthetic graphite kubva petroleum coke zvese zvinopa mutengo wekugadzira uri pazasi pezvimwe zvinhu. Kubva 2024, natural spherical graphite inotengesa madhora zviuru zvinomwe patani zvichienzaniswa neyakagadzirwa graphite pamadhora gumi patani. Zvinhu zvinoda kuchena kunodarika 99.95% pamabhatiri ekushandisa, anowanwa kuburikidza nemaitiro ekuchenesa izvo, nepo simba-zvakawanda, rinoramba richibudirira mune zveupfumi pamwero.

Mafungiro ekuchengetedza anofarirawo graphite. Iyo yakasimba electrolyte interphase (SEI) layer inoumba panzvimbo yegraphite panguva yekutanga kuchaja inoita sechivharo chekudzivirira, ichidzivirira kuenderera kwe electrolyte kuora uku ichibvumira lithium ion kutakura. Izvi -zvekuzvidzivirira, zvakaonekwa nevatsvakurudzi muna 1990 vachishandisa ethylene carbonate electrolytes, zvakaita kuti graphite anode ikwanise kutengeswa uye yakamutsa shanduko yelithium{4}}ion bhatiri yakatevera.

Graphite Anode

Indasitiri yebhatiri inopa graphite kuburikidza nenzira mbiri dzakasiyana, imwe neimwe iine zvakanakira.

Natural graphite inotangira kubva kune flake crystalline deposits inotorwa kuburikidza nemigodhi, kunyanya muChina, Brazil, Madagascar, neIndia. Vagadziri vanogadzira raw flake graphite kuburikidza nekupwanya, spheroidization-apo masimba emagetsi anoumba zvisingaite maflakes kuita zvidimbu zvakaurungana-kurongedza, uye kucheneswa kuti zvisvike bhatiri{3}}madiro egiredhi. Kugadzirwa kwema graphite kwakasikwa kunopedza 1.1 × 10⁴ MJ patani yesimba.

Nhanho ye spheroidization inoratidza yakakosha. Kuita kwebhatiri kunonatsiridza nespherical particles nekuti inorongedza zvakanyanya mumagetsi, inowedzera volumetric simba density uye inovandudza conductivity yemagetsi mukati meanode chimiro. Natural graphite kazhinji inoratidza yakakwirira crystallinity pane yekugadzira dzimwe nzira, inopa yepamusoro yemagetsi uye yekupisa conductivity.

Synthetic graphite inotanga kubva mupetroleum coke, tsono coke, kana pitch coke-byproducts yekunatsa oiri. Vagadziri vanopisa aya kabhoni precursors kune tembiricha inodarika zviuru zviviri nemazana mashanu panguva yegraphitization, vachigadzirisa maatomu ekabhoni muakarongedzerwa, akaturikidzana chimiro chegraphite. Kuita uku kunoda ingangoita 4 × 10⁴ MJ patani-3.6 nguva inodiwa simba rekugadzirwa kwegirafu.

Zvisinei, synthetic graphite inopa zvinhu zvinowirirana. Iyo inodzorwa yekugadzira maitiro inoburitsa yunifomu particle saizi uye inofanotaurwa electrochemical maitiro, ayo vanogadzira bhatiri vanokoshesa kutonga kwemhando. Parizvino, indasitiri inopatsanura ingangoita 55% yekugadzira uye 45% yakasikwa graphite yekugadzira anode, kunyangwe iyi chiyero ichichinja sekucheneswa kwegirafu kwechisikigo kuchivandudza.

Pakazosvika 2020, zvechisikigo graphite anode zvinhu zvakatora 39% yemusika, paine fungidziro inoratidza kuenderera mberi kwekukura kunotungamirwa nekushomeka kwemamiriro ekunze uye kuderedzwa kwesimba rekushandisa panguva yekugadzira.

Graphite yakapararira yekugamuchira masiki inomanikidza kuita basa: kukurumidza kuchaja. Kana mabhatiri achichaja nekukasira, lithium ion inosvika pane anode pamusoro nekukurumidza kupfuura iyo inogona kupindirana muchimiro chegraphite. Maion akawandisa anobva aisa panzvimbo yeanode sesimbi yelithium-chinhu chinonzi lithium plating.

Lithium plating inogadzira matambudziko akawanda. Iyo simbi yakapfava haibatsire kuhuwandu hwebhatiri, zvinonyatso kudzikisa iripo yekuchengetedza simba. Zvikuru zvine chekuita, kudzokororwa kupepeta uye kubvisa kukuvadza anode chimiro uye kushandisa mvura ye electrolyte, ichiwedzera simba kupera. Muzviitiko zvakanyanyisa, lithium dendrites inogona kukura kuburikidza nekuparadzanisa pakati pe electrodes, zvichiita kuti mukati mapfupi madiki.

Chikonzero chikuru chiri mu lithium diffusion kinetics. Kuisa lithium ions pakati pemagraphite layers kunoda kuti vakunde zvipingamupinyi zvesimba pavanenge vachifamba kubva ku electrolyte kupinda muchimiro chakasimba. Pasi pezviyero zvakakwirira zvazvino, concentration polarization inokura-iyo lithium concentration panzvimbo yeanode inodarika iyo inogona kunwa zvinhu, zvichiita kuti inogona kuderera zvekuisa plate metallic lithium pane kudaro.

Vatsvakurudzi vari kugadzirisa izvi zvisingakwanisi kuburikidza nenzira dzakawanda. Mabhanditi epamusoro achishandisa amorphous carbon kana lithium-ion conducting materials anogadzira mamwe mayunifomu elithium kugovera uye kukurumidza kutakura ayoni panzvimbo yegraphite. Electrolyte optimization ine chaiwo ekuwedzera inobatsira kuumba yakagadzikana SEI maseru ayo anofambisa ion kutamiswa. Vamwe vagadziri vanogadzirisa graphite particle morphology kana kuwedzera interlayer spacing kuti ikurumidze kupararira kwe lithium.

Zvidzidzo zvenguva pfupi yapfuura muna 2024 zvakaratidza kuti magraphite anode ane optimized coatings uye electrolyte magadzirirwo anogona kuchengetedza mitengo yekuchaja inosvika 6C (yakazara kuchaji mumaminetsi gumi) ichichengetedza hupenyu hwekutenderera kupfuura mazana mashanu. Nekudaro, iyi inoramba iri nzvimbo inoshanda yekusimudzira sezvo vagadziri vemotokari dzemagetsi vanotarisa kunyangwe nekukurumidza kuchaja kugona.

Graphite Anode

Silicon-based anodes inomiririra dambudziko rekutanga kusimba regraphite, richifambiswa nesilicon yakakwira zvinoshamisa kugona kwe4,200 mAh/g{3}}kupfuura zvakapetwa kagumi zvegraphite. Uku kugona mukana kunobva pakukwanisa kwesilicon kubatana ne4.4 lithium maatomu pasilicon atomu (Li ₄.₄Si), nepo graphite ichida matanhatu kabhoni maatomu kuti abatanidze neiyo lithium ion.

Kukwidza kwacho kuri pachena. Kutsiva kunyange 10-20% yegraphite nesilicon kunogona kuwedzera bhatiri simba density ne10-30%, kushandura zvakananga kune kureba kwekutyaira mumotokari dzemagetsi. Mazhinji ekutanga uye makuru vagadziri vakadyara zvakanyanya musilicon anode kusimudzira, nemakambani akaita seSila Nanotechnologies neBMW anodyidzana pane zvekutengesa zvikumbiro zvakanangwa pakati pe2020s.

Asi mukana wesilicon unouya nechikanganiso chakakosha: kuwedzera kwevhoriyamu. Silicon particles inozvimba kupfuura 300% panguva ye lithiation, zvichienzaniswa ne graphite ine mwero 10%. Uku kukura kukuru kunotsemura zvimedu, kunokanganisa kubatana kwemagetsi, uye kumisa iyo SEI layer. Iyo anode inozvipwanya pachayo kuburikidza nekushanda kwakajairika, zvichikonzera kukurumidza kupera simba. Ekutanga silicon anodes haana kumbopona zana remachaji.

Mainjiniya vari kugadzira mhinduro. Nanostructured silicon-zvimedu pachiyero chenanometer-zvirinani zvinogonesa kushushikana kwekuwedzera. Porous silicon zvimiro zvinopa yemukati isina nzvimbo nzvimbo yekuwedzera. Silicon oxide (SiOx) inopa kuenderana neiyo theoretical kugona kwe2,675 mAh/g uye yakaderedzwa yekuwedzera ichienzaniswa nesilicon yakachena. Mabhainda epamusoro-zvinhu zvinobata anode particles pamwechete-anosanganisira elastic properties kuitira kuchengetedza magetsi panguva yekuchinja kwevhoriyamu.

Silicon-graphite composites parizvino inomiririra nzira inonyanyobudirira yekutengeserana. Nekusanganisa 5-15% sililicon mugraphite anode, vagadziri vanowana zvine musoro kuvandudza kugona uku vachidzikamisa zvinoparadza zvinokonzerwa nesilicon kuwedzera. Iyi hybrid strategy inopa 15-20% yakakwira simba density pane yakachena graphite anode uchichengetedza 500-800 kutenderera hupenyu-inogamuchirwa kune akawanda maapplication.

Mutengo unoramba uri chipingamupinyi chakakosha. Silicon{{1}kabhoni composite anode inodhura ingangoita 750,000 CNY patani muna 2024, zvichienzaniswa ne50,000-100,000 CNY patani yemagraphite anode. Vaongorori veindasitiri vanogadzira silicon anode zvinhu zvinoda kudzikiswa kwemutengo kusvika ku110,000-170,000 CNY patani yekutorwa kwekutengesa kwakapararira.

Musika we graphite anode uri kuona kukura kwakanyanya. Inokosha pamadhora mazana maviri nemakumi mapfumbamwe emadhora muna 2022, fungidziro yeindasitiri inofungidzira kuti musika uchasvika madhora mazana mashanu nemakumi masere nemakumi masere nemakumi matatu nemakumi matatu nemakumi matatu nemazana matatu emadhora, inomiririra huwandu hwekukura kwepagore hwe19.9%. Kuwedzeredza uku kunoteedzera kutorwa kwemotokari yemagetsi uye grid-chiyero chekuchengetedza simba.

Supply dynamics inofanirwa kutariswa. Bhatiri rega rega remotokari yemagetsi rine 50-100 kg yegraphite-inoda kupeta kagumi magirafu kupfuura lithium. Imwe Tesla Model S, semuenzaniso, inoda inenge 85 kg yegraphite yebhatiri pack. Kugadzirwa kweGlobal EV kuri kukwira nekukurumidza, iine mota dzemagetsi dzinoverengera kuwedzera muzana yekutengesa kwemotokari.

China inotonga magirafu ekupa cheni, ichidzora ese ari maviri echisikigo graphite migodhi uye yekugadzira graphite kugadzirwa. Uku kusangana kwakasimudza kushushikana kwekuchengetedza pakati pevagadziri vemabhatiri mune mamwe matunhu. Zvirango zveChina 2023 zvekutengesa kunze kwenyika pazvinhu zvegraphite zvakawedzera kunetsekana uku, zvichiita kuti nyika dzekuMadokero dziise mari mukugadzira kugadzirwa kwegirafu mudzimba uye kugona kugadzirisa.

Nzira yekuchenesa inomiririra mutyairi wemutengo wekutanga. Kushandura girafu yakacherwa kuita bhatiri-giredhi zvinhu zvinoda maasidhi akasimba uye matanho akawanda ekugadzirisa, zvichiita kuti tifunge nezvezvakatipoteredza. Zvisineyi, iyo kabhoni yakazara yekugadzirwa kwegraphite yakasikwa inoramba yakaderera pane yekugadzira graphite, zvakanyanya nekuda kwesimba-yakakura graphitization process inodiwa pakugadzira zvinhu.

Kudzokorodza kunopa zvose mukana uye dambudziko. Lithium akarega basa-mabhatiri eion ane huwandu hwakawanda hwegraphite{{2}kazhinji 40-50% ye "black mass" yakadzoserwa kubva pakudzokorodza. Zvisineyi, kutora nekuchenesazve-kuchenesa graphite iyi kusvika kubhatiri-zvakatemwa zvegiredhi zvinoramba zvakaomera zvehunyanzvi uye zvisina hupfumi pazvikero zvazvino. Vatsvagiri vari kuvandudza maitiro ekugadzirisa zvakare, vachiziva kuti yakavharwa-loop graphite kudzoreredza inozowedzera kukosha sezvo mavhoriyamu ebhatiri anokura.

Nepo mabhatiri eti lithium-ion anomiririra graphite anode yakakura kushandisa, zvinhu izvi zvinoshanda mune mamwe maelectrochemical system. Mumaseru emafuta, kunyanya proton exchange membrane fuel cells (PEMFCs), graphite inoumba cathode flow field plates iyo inogovera okisijeni zvakaenzana kunzvimbo dzekuita apo ichiitisa maerekitironi.

Kugadzirwa kweAluminium kunovimba zvakanyanya negraphite anode mu electrolytic smelting process. The Hall-Héroult process, iyo inogadzira inenge yese aruminiyamu yeprimary, inoshandisa hombe graphite anode inoita oxidize zvishoma nezvishoma uye inofanira kuchinjwa nguva nenguva. Ichi chishandiso cheindasitiri chinodya yakakura graphite huwandu pasi rose.

Emerging bhatiri chemistries vari kuongorora graphite zvakare. Sodium-mabhatiri eion uye potasium-mabhatiri eion anogona kushandisa graphite anode, kunyangwe aine mamethoneti akasiyana uye kugona zvichienzaniswa nelithium systems. Sezvo aya mamwe mabhatiri tekinoroji achikura, anogona kugadzira kuwedzera kudiwa kwezvinhu zvegraphite anode.

Vatsvagiri vebhatiri vari kutsvaga nzira dzinoverengeka dzekusimudzira kuita kwegraphite anode pasina kusiya izvo zvakakosha zvezvinhu.

Interphase engineering inotarisa pakugadzirisa iyo SEI layer yekugadzira. Iyo SEI inosarudza lithium yekufambisa kinetics, cyclability, uye kuchengetedza maitiro. Yepamberi electrolyte additives uye epamusoro marapirwo anovavarira kugadzira akatetepa, akawedzera yunifomu SEI maseru anoderedza kushandiswa kwelithium panguva yekuumbwa uku uchiwedzera ionic conductivity.

Particle engineering inogadzirisa graphite morphology kuvandudza mashandiro. Vatsvakurudzi vari kuongorora artificial graphite ane pore structures, pamusoro-modified particles ane electrolyte wetting yakavandudzwa, uye maumbirwo ecomposite ayo anosanganisa magraphite akasiyana siyana kuti akwidze zvese zviri zviviri kugona uye chiyero.

Interlayer spacing modification inomiririra imwe nzira. Nekuwedzera zvishoma nzvimbo pakati pemagraphene layers-somuenzaniso, kuburikidza nekemikari intercalation kana structural defects-vatsvakurudzi vanogona kukurumidzisa kupararira kwelithium. Basa richangoburwa muna 2024 rakaratidza kuti kunyatsodzora kuwedzera kwe interlayer kubva pa 0.3354 nm kusvika pa 0.342 nm zvakavandudza kukurumidza-kuchaja uku zvichiramba zvichigadzikana.

Coating tekinoroji inoenderera mberi. Ose ari maviri akaoma kabhoni uye akapfava kabhoni coatings anopa akasiyana mabhenefiti: yakaoma kabhoni coatings inosimudzira mashandiro, kunyanya pakukwirira kwazvino, ukuwo nyoro kabhoni coatings inovandudza yekutanga coulombic kunyatsoita uye kugadzikana kwebhasikoro. Kusarudza zvekupfekwa nazvo zvinoenderana nezvinodiwa neapplication zvinobvumira kukwenenzvera kwe-rate-life triangle inotsanangura kushanda kwebhatiri.

Graphite Anode

Graphite inoyera zvakawanda zvinodiwa izvo zvimwe zvinhu zvinonetsa kuti zvienzane panguva imwe chete. Chimiro chayo chakaturikidzana chinogashira lithium ions ine kushoma vhoriyamu shanduko (isingasviki gumi muzana yekuwedzera), ichigonesa zviuru zvechaji kutenderera. Zvinhu izvi zvinoshanda zvakaderera zvakanyanya (0.01-0.2 V), zvichiita kuti bhatiri riwedzere simba. Yakawanda, isingadhure, uye inonzwisiswa mushure memakumi emakore ekushandiswa kwekutengesa. Nepo zvinhu zvakaita sesilicon zvichipa huwandu hwepamusoro, ivo vanotambura nematambudziko akakura ekuwedzera vhoriyamu ayo anodzivirira graphite.

Natural graphite inobva kumabasa emigodhi uye inowanzopa zvirinani magetsi conductivity nekuda kwepamusoro crystallinity. Zvinoda simba shoma kugadzira-inenge 1.1 × 10⁴ MJ patani maringe ne4 × 10⁴ MJ patani yekugadzira graphite. Synthetic graphite, yakagadzirwa nekupisa petroleum coke kusvika pamusoro pe2,500 dhigirii, inoburitsa zvinhu zvinowirirana uye kuchena. Parizvino, indasitiri inoshandisa ingangoita makumi mashanu neshanu muzana ekugadzira uye 45% yechisikigo graphite, kunyange echisikigo chikamu chemusika chiri kukura nekuda kwezvakatipoteredza uye mutengo zvakanakira.

Graphite anode inotarisana nematambudziko nekuchaja nekukurumidza. Kana kuchaja ikozvino kwakakwira zvakanyanya, lithium ion inosvika nekukurumidza kupfuura yavanogona kuisa muchimiro chegraphite, ichivaita kuti ipure sesimbi lithium pane anode pamusoro panzvimbo. Iyi lithium plating inoderedza huwandu uye inokuvadza bhatiri. Vatsvakurudzi vari kuvandudza kugona kwekuchaja-kuburikidza nemachira, electrolyte optimization, uye particle engineering, nezvidzidzo zve2024 zvichangoburwa zvakawana 6C yekuchaja (maminetsi gumi) tichichengetedza hupenyu hunogamuchirika.

Silicon haizonyatso kutsiva graphite munguva pfupi iri kutevera, kunyangwe ichive chikamu chemhinduro. Silicon inopa 10x yakakwirira simba kupfuura graphite asi inowedzera 300% panguva yekuchaja, zvichikonzera kuparara nekukurumidza. Iyo inoshanda nzira inoshandisa silicon-graphite macomposites, kusanganisa 5-15% silicon mune graphite anode kuwana 15-20% yakakwirira simba density uchigadzirisa matambudziko ekuwedzera. Yakachena silicon anode inoramba iri mukusimudzira, nekutengeserana kungangoenderana nekuwana inogamuchirika kutenderera hupenyu uye kuderedzwa kwemutengo.

Iyo graphite anode inoratidza kuti zvinhu zvinoita sezviri nyore zvinowanzoshanda sei chaizvo nekuda kwekureruka ikoko. Lithium ions inoda kumwe kwainoenda panguva yekuchaja{{1}kumwe kwakagadzikana, kunodzoserwa kumashure, uye kusingaparare mushure menguva shoma. Graphite's layered chimiro inopa izvo chaizvo, pasina dhirama kana kuoma. Nepo vaongorori vachidzingirira masimba epamusoro uye nekukurumidza kuchaja, vari kuona kuti kubva kure zvakanyanya kubva kune zvakakosha zvegraphite zvinounza matambudziko anowanzo kupfuura mabhenefiti. Mabhatiri eLithium anoramba achitonga kwemakumi emakore kwete zvisinei nezvaasingakwanisi, asi nekuti zvinokwanisika uye zvinonzwisiswa-.

Data Source:

Graphite seanode zvinhu: Yakakosha nzira, kufambira mberi kwazvino uye kufambira mberi - Energy Storage Materials (2020)

Global Graphite Anode Market Analysis - Virtue Market Research (2024)

Natural graphite anode ye advanced lithium-ion Mabhatiri - Chemical Engineering Journal (2024)

Remangwana recarbon anode relithium-mabhatiri eion - Carbon Future (2024)

Inokurumidza{{0}kuchaja graphite anode yelithium-mabhatiri eion - Mavara Akashandiswa ePhysics (2024)

Ongorora nezveGraphite Anodes yeKukurumidza-Kuchaja Lithium-Mabhatiri eIon - Yepamusoro Functional Materials (2024)

Graphite: iyo itsva yakakosha mineral - Nature Ongororo Zvishandiso (2025)