Kune zviratidzo zvakawanda zvehunyanzvi zvezvinhu zve graphite anode, uye zvakaoma kuzvifunga, zvinosanganisira nzvimbo chaiyo yekumusoro, kugoverwa kwehukuru hwezvikamu, huwandu hwetap density, huwandu hwe compaction, huwandu hwechokwadi, simba rekutanga rekuchaja uye rekuburitsa, kushanda kwekutanga, nezvimwewo. Pamusoro pezvo, kune zviratidzo zve electrochemical zvakaita se cycle performance, rate performance, kuzvimba, nezvimwewo. Saka, ndezvipi zviratidzo zvekushanda kwezvinhu zve graphite anode? Zviri mukati zvinounzwa kwamuri neHCMilling (Guilin Hongcheng), mugadziri wezvinhu zveanode chigayo chekukuya.

01 nzvimbo chaiyo yepamusoro

Zvinoreva nzvimbo yepamusoro pechinhu pahuremu hweyuniti. Kana chidimbu chikave chidiki, nzvimbo chaiyo yepamusoro inokurawo.

Electrode isina kunaka ine zvidimbu zvidiki uye nzvimbo yepamusoro chaiyo ine nzira dzakawanda uye nzira pfupi dzekufamba kwe lithium ion, uye mashandiro erate ari nani. Zvisinei, nekuda kwenzvimbo yakakura yekubatana ne electrolyte, nzvimbo yekugadzira firimu reSEI yakakurawo, uye kushanda kwekutanga kuchadererawo. . Zvikamu zvikuru, kune rumwe rutivi, zvine mukana wekuwedzera huwandu hwe compaction.

Nzvimbo chaiyo yezvinhu zve graphite anode zviri nani kuti ive pasi pe 5m2/g.

02 Kugoverwa kwehukuru hwezvikamu

Simba rehukuru hwezvinhu zve graphite anode pakushanda kwazvo kwe electrochemical nderekuti hukuru hwezvinhu zve anode huchakanganisa zvakananga huwandu hwemvura inoyerera uye nzvimbo chaiyo yezvinhu.

Hukuru hwehuwandu hwepombi huchakanganisa zvakananga huwandu hwesimba rechinhu chacho, uye kugoverwa kwehukuru hwezvimedu zvakakodzera chete ndiko kunogona kuwedzera mashandiro echinhu chacho.

03 Kuwanda kweTap

Kuwanda kwepombi (tap density) ihuremu hwepayuniti imwe neimwe (unit volume) hunoyerwa nekudengenyeka kunoita kuti hupfu huoneke hwakanyatsosimba. Chiratidzo chakakosha chekuyera chinhu chinoshanda. Huwandu hwebhatiri re lithium-ion hushoma. Kana huwandu hwepombi hwakakwira, chinhu chinoshanda payuniti imwe neimwe chine huremu hwakakura, uye huwandu hwepombi hwakakwira.

04 Kuwanda kweKusimba

Kuwanda kwesimbi kunonyanya kuitirwa danda, zvinoreva huwandu hwesimbi mushure mekumonera mushure mekunge chinhu chinoshanda cheelectrode chisina kunaka uye binder yagadzirwa kuita danda, huwandu hwesimbi = huwandu hwenzvimbo / (ukobvu hwedanda mushure mekumonera kubvisa ukobvu hwe copper foil).

Kuwanda kwesimbi inobatirira kwakabatana zvakanyanya nekugona kwayo kushandisa pepa, kushanda kwayo zvakanaka, kuramba kwayo mukati uye mashandiro ayo.

Zvinhu zvinopesvedzera kuwanda kwezvikamu: saizi yezvikamu, kupararira uye chimiro chezvikamu zvose zvine simba.

05 Kuwanda Kwechokwadi

Huremu hwezvinhu zvakasimba payuniti imwe neimwe yechinhu chiri muchimiro chakaoma kwazvo (kusasanganisa maburi emukati).

Sezvo density chaiyo ichiyerwa muchimiro chakamanikana, ichave yakakwira kupfuura density yakamanikana. Kazhinji, density chaiyo > density yakamanikana > density yakamanikana.

06 Kuchaja kwekutanga uye kugona kwayo kuburitsa zvinhu

Chinhu che graphite anode chine simba risingadzoreki mukutanga kwekuchaja-kuburitsa simba. Munguva yekutanga yekuchaja bhatiri re lithium-ion, pamusoro pechinhu che anode panobatanidzwa nema ioni e lithium uye mamorekuru e solvent ari mu electrolyte anoiswa pamwe chete, uye pamusoro pechinhu che anode panobva paora kuita SEI. Firimu rePassivation. Mushure mekunge nzvimbo ye negative electrode yafukidzwa zvizere nefirimu re SEI, mamorekuru e solvent haakwanise kusanganisa simba, uye reaction yakamiswa. Kugadzirwa kwefirimu re SEI kunodya chikamu chema ioni e lithium, uye chikamu ichi chema ioni e lithium hachigone kuburitswa pamusoro pe electrode negative panguva yekuburitsa simba, nokudaro zvichikonzera kurasikirwa kwesimba risingadzoreki, nokudaro zvichideredza simba rekutanga rekuburitsa simba.

07 Kushanda Kwekutanga kweCoulomb

Chiratidzo chakakosha chekuongorora mashandiro echinhu chinoburitsa anode ndechekutanga kwayo kushanda zvakanaka pakuchaja-kuburitsa magetsi, inozivikanwawo sekushanda zvakanaka kwekutanga kweCoulomb. Kekutanga, kushanda zvakanaka kweCoulombic kunosarudza zvakananga mashandiro echinhu chinoburitsa magetsi.

Sezvo firimu reSEI richinyanya kugadzirwa pamusoro pechinhu cheelectrode, nzvimbo chaiyo yechinhu cheelectrode inokanganisa zvakananga nzvimbo yekuumbwa kwefirimu reSEI. Nzvimbo chaiyo yekubata electrolyte yakakura, nzvimbo yekubata electrolyte yakakura uye nzvimbo yekuumba firimu reSEI yakakura.

Zvinowanzo fungidzirwa kuti kuumbwa kwefirimu reSEI rakasimba kunobatsira pakuchaja nekuburitsa bhatiri, uye firimu reSEI rakasimba harina kunaka pakuita izvi, izvo zvinogara zvichidya electrolyte, zvoita kuti firimu reSEI riwedzere kukora, uye zvinowedzera kuramba kwemukati.

08 Kushanda kwebhasikoro

Kushanda kwebhatiri pakutenderera kunoreva huwandu hwemari yekuchaja nekuburitsa simba iyo bhatiri rinowana pasi pehurongwa hwekuchaja nekuburitsa simba kana simba rebhatiri radzikira kusvika pamutengo wakatarwa. Panyaya yekushanda kwebhatiri, bhatiri reSEI rinodzivisa kupararira kwemaion e lithium kusvika pamwero wakati. Sezvo huwandu hwemari yekutenderera huchiwedzera, bhatiri reSEI richaramba richidonha, richibviswa, uye richiiswa pamusoro peelectrode isina simba, zvichikonzera kuwedzera zvishoma nezvishoma kwekudzivirira kwemukati kweelectrode isina simba, izvo zvinounza kupisa Kuunganidzwa uye kurasikirwa nesimba.

09 Kuwedzera

Pane hukama hwakanaka pakati pekuwedzera uye hupenyu hwe cycle. Mushure mekunge electrode isina kunaka yakura, chekutanga, winding core ichachinja chimiro, negative electrode particles dzichaita micro-cracks, SEI film ichatyoka uye ichagadziriswazve, electrolyte ichadyiwa, uye mashandiro e cycle achadzikira; chechipiri, diaphragm ichadzvanywa. Kumanikidzwa, kunyanya kubuda kwe diaphragm pamucheto we right-angle we pole ear, kwakakomba zvikuru, uye zviri nyore kukonzera micro-short circuit kana micro-metal lithium precipitation nekufambira mberi kwe charge-discharge cycle.

Kana tichitaura nezvekuwedzera kwacho, maion e lithium achaiswa mu graphite interlayer spacing panguva ye graphite intercalation process, zvichikonzera kuwedzera kwe interlayer spacing uye kuwedzera kwe volume. Chikamu ichi che expansion hachidzoreki. Huwandu hwe expansion hwakabatana ne degree ye orientation ye negative electrode, degree of orientation = I004/I110, iyo inogona kuverengerwa kubva kuXRD data. Anisotropic graphite material inowanzo pfuura lattice expansion munzira imwecheteyo (C-axis direction ye graphite crystal) panguva ye lithium intercalation process, izvo zvinozoita kuti bhatiri riwedzere volume.

10Tarisa mashandiro

Kupararira kwemaion e lithium mu graphite anode zvinhu kune gwara rakasimba, kureva kuti, rinogona kungoiswa rakatarisa kumagumo kweC-axis ye graphite crystal. Zvinhu zve anode zvine zvidimbu zvidiki uye nzvimbo yepamusoro chaiyo zvine kumhanya kuri nani. Pamusoro pezvo, kuramba kwe electrode surface (nekuda kweSEI film) uye electrode conductivity zvinokanganisawo kumhanya kwekushanda.

Zvakafanana nehupenyu hwedenderedzwa uye kuwedzera, electrode ye isotropic negative ine nzira dzakawanda dzekutakura lithium ion, iyo inogadzirisa matambudziko ekupinda kushoma uye mwero wakaderera wekupararira muchimiro che anisotropic. Zvizhinji zvezvinhu zvinoshandisa matekinoroji akadai segranulation uye coating kuti zvivandudze mashandiro azvo ekumhanya.

HCMilling (Guilin Hongcheng) ikambani inogadzira anode materials grinding mill.HLMX nhevedzanozvinhu zveanode zvikuru-chigayo chakanaka chakamira, HCHzvinhu zveanode chigayo chakanaka kwazvouye mimwe michina yekukuya graphite yakagadzirwa nesu yave ichishandiswa zvakanyanya mukugadzira zvinhu zve graphite anode. Kana muine zvinodiwa zvakafanana, ndapota taurai nesu kuti muwane rumwe ruzivo nezvemichina uye mutipe ruzivo rwekutevera:

Zita rezvinhu zvisina kugadzirwa

Kukora kwechigadzirwa (mesh/μm)

kugona (t/h)