Kunezinkomba eziningi zobuchwepheshe ze-graphite anode materials, futhi kunzima ukucabangela, ikakhulukazi kufaka phakathi indawo ethile, ukusabalalisa usayizi wezinhlayiyana, ukuminyana kompompi, ukuminyana kwe-compaction, ukuminyana kweqiniso, ukushaja kokuqala nokukhipha umthamo othize, ukusebenza kahle kokuqala, njll. Ngaphezu kwalokho, kunezinkomba ze-electrochemical ezifana nokusebenza komjikelezo, ukusebenza kwezinga, ukuvuvukala, njalonjalo.Ngakho-ke, yiziphi izinkomba zokusebenza ze-graphite anode materials?Okuqukethwe okulandelayo kwethulwa kuwe ngabakwa-HCMilling(Guilin Hongcheng), umkhiqizi weizinto ze-anode umshini wokugaya.

01 indawo ethile

Isho indawo engaphezulu yento ngeyunithi yesisindo.I-particle encane, indawo engaphezulu ethile inkulu.

I-electrode engalungile enezinhlayiya ezincane kanye nendawo ethile ephezulu ineziteshi eziningi nezindlela ezimfushane zokufuduka kwe-lithium ion, futhi ukusebenza kwezinga kungcono.Kodwa-ke, ngenxa yendawo enkulu yokuxhumana ne-electrolyte, indawo yokwenza ifilimu ye-SEI nayo inkulu, futhi ukusebenza kahle kokuqala kuzophinde kube phansi..Izinhlayiya ezinkulu, ngakolunye uhlangothi, zinenzuzo ye-compaction density enkulu.

Indawo ethize yezinto ze-graphite anode kungcono ibe ngaphansi kuka-5m2/g.

02 Ukusabalalisa usayizi we-particle

Umthelela wosayizi wezinhlayiyana zezinto ze-graphite anode ekusebenzeni kwayo kwe-electrochemical ukuthi usayizi wezinhlayiyana zezinto ze-anode zizothinta ngokuqondile ukuminyana kompompi bezinto kanye nendawo ethile yendawo.

Usayizi wokuminyana kompompi uzothinta ngokuqondile ukuminyana kwamandla wevolumu wento, futhi ukusatshalaliswa kosayizi wezinhlayiyana ezifanele kuphela wento engakhulisa ukusebenza kwento.

03 Thinta Ukuminyana

Ukuminyana kompompi ubukhulu beyunithi ngayinye elinganiswa ngokudlidliza okwenza impushana ibonakale ngendlela yokupakisha eqinile.Kuyinkomba ebalulekile yokukala into esebenzayo.Umthamo webhethri le-lithium-ion unomkhawulo.Uma ukuminyana kompompi kuphezulu, into esebenzayo ngeyunithi ngayinye inesisindo esikhulu, futhi umthamo wevolumu uphezulu.

04 Ukuminyana Okuminyana

Ukuminyana kwe-compaction ikakhulukazi okwesiqephu sesigxobo, okubhekisela ekumineni ngemva kokugingqika ngemva kokusebenza kwe-electrode engasebenzi kanye ne-binder yenziwe ibe yisiqephu sesigxobo, i-compaction density = ukuminyana kwendawo / (ubukhulu besiqephu sesigxobo ngemva kokuginqika ubukhulu be-foil yethusi).

Ukuminyana okuhlangene kuhlobene eduze nomthamo othize weshidi, ukusebenza kahle, ukumelana kwangaphakathi nokusebenza komjikelezo webhethri.

Izici ezithonyayo zokuminyana kokucinana: usayizi wezinhlayiyana, ukusatshalaliswa kanye nokuma kwazo zonke kunomthelela.

05 Ukuminyana Kwangempela

Isisindo sento eqinile ngeyunithi ngayinye yevolumu yento esesimweni esiminyene ngokuphelele (ngaphandle kwe-voids yangaphakathi).

Njengoba ukuminyana kwangempela kukalwa kusimo esihlangene, kuzoba phezulu kunokuminyana okuthenjiwe.Ngokuvamile, ukuminyana kwangempela > ukuminyana okuhlanganisiwe > ukuminyana okuthenjiwe.

06 Ukushaja kokuqala kanye nomthamo othize wokukhipha

Izinto ze-graphite anode zinamandla angenakuhlehliswa emjikelezweni wokuqala wokushaja.Phakathi nenqubo yokuqala yokushaja yebhethri ye-lithium-ion, ingaphezulu lempahla ye-anode lihlanganiswa ne-lithium ion futhi ama-molecule e-solvent ku-electrolyte afakwe ngokuhlanganyela, futhi ingaphezulu le-anode material liyabola ukuze lakhe i-SEI.Ifilimu ye-passivation.Kuphela ngemva kokuba indawo ye-electrode engalungile ihlanganiswe ngokuphelele yifilimu ye-SEI, ama-molecule e-solvent awakwazanga ukuhlangana, futhi ukusabela kwamiswa.Isizukulwane sefilimu ye-SEI sisebenzisa ingxenye ye-lithium ion, futhi le ngxenye ye-lithium ion ayikwazi ukukhishwa ebusweni be-electrode engalungile ngesikhathi senqubo yokukhipha, ngaleyo ndlela ibangele ukulahlekelwa kwamandla okungenakuhlehliswa, ngaleyo ndlela kunciphise umthamo othize wokukhishwa kokuqala.

07 Ukuphumelela Kokuqala Kwe-Coulomb

Inkomba ebalulekile yokuhlola ukusebenza kwe-anode ukusebenza kahle kwayo kokuqala kokushaja, okwaziwa nangokuthi ukusebenza kahle kokuqala kwe-Coulomb.Ngokokuqala ngqa, ukusebenza kahle kwe-Coulombic kunquma ngokuqondile ukusebenza kwezinto ze-electrode.

Njengoba ifilimu ye-SEI yakhiwe kakhulu ebusweni bezinto ze-electrode, indawo ethile yendawo ye-electrode ithinta ngokuqondile indawo yokwakheka kwefilimu ye-SEI.Uma kukhulu indawo ethile engaphezulu, indawo yokuxhumana ne-electrolyte inkulu kanye nendawo yokwenza ifilimu ye-SEI.

Ngokuvamile kunenkolelo yokuthi ukwakheka kwefilimu ye-SEI ezinzile kunenzuzo ekushajweni nasekukhishweni kwebhethri, futhi ifilimu ye-SEI engazinzile ayikuthandi ukusabela, okuzolokhu kudla i-electrolyte, kunwebe ukushuba kwefilimu ye-SEI, futhi ukwandisa ukumelana kwangaphakathi.

08 Ukusebenza komjikelezo

Ukusebenza komjikelezo webhethri kubhekisela enanini lokushajwa nokukhipha ibhethri elihlangabezana nakho ngaphansi kokushajwa okuthile kanye nohlelo lokuphuma lapho umthamo webhethri wehla ube inani elishiwo.Mayelana nokusebenza komjikelezo, ifilimu ye-SEI izovimbela ukusatshalaliswa kwe-lithium ion ngezinga elithile.Njengoba inani lemijikelezo landa, ifilimu ye-SEI izoqhubeka nokuwa, ixebuka, futhi ibeke phezu kwe-electrode engalungile, okuholela ekwenyukeni kancane kancane kokumelana kwangaphakathi kwe-electrode engalungile, okuletha ukushisa Ukunqwabelana nokulahlekelwa amandla. .

09 Ukwandiswa

Kukhona ukuhlobana okuhle phakathi kokunwetshwa nempilo yomjikelezo.Ngemuva kokuthi i-electrode engalungile ikhule, okokuqala, umgogodla ovunguzayo uzokhubazeka, izinhlayiya ze-electrode ezingalungile zizokwakha ama-micro-cracks, ifilimu ye-SEI izophulwa futhi ihlelwe kabusha, i-electrolyte izodliwa, futhi ukusebenza komjikelezo kuzokonakala;okwesibili, i-diaphragm izokhanywa.Ingcindezi, ikakhulukazi i-extrusion ye-diaphragm emaphethelweni e-engeli engakwesokudla ye-pole ear, ibucayi kakhulu, futhi kulula ukubangela i-micro-short circuit noma i-micro-metal ye-lithium precipitation ngokuqhubeka komjikelezo wokushaja.

Ngokuphathelene nokunwetshwa ngokwako, ama-ion e-lithium azoshumeka esikhaleni se-graphite interlayer ngesikhathi senqubo yokuhlanganisa i-graphite, okuholela ekwandeni kwesikhala se-interlayer kanye nokwanda kwevolumu.Le ngxenye enwetshiwe ayinakuhlehliswa.Inani lokunwetshwa lihlobene nezinga lokuma kwe-electrode engalungile, izinga lokuma = I004/I110, elingabalwa kudatha ye-XRD.I-anisotropic graphite material ijwayele ukunwetshwa kwe-lattice ohlangothini olufanayo (isiqondiso se-C-axis ye-graphite crystal) ngesikhathi senqubo ye-lithium intercalation, okuzoholela ekwandiseni umthamo omkhulu webhethri.

10Linganisa ukusebenza

Ukusatshalaliswa kwe-lithium ion ku-graphite anode material kunokuqondisa okuqinile, okungukuthi, kungafakwa kuphela nge-perpendicular ekupheleni kobuso be-C-axis yekristalu ye-graphite.Izinto ze-anode ezinezinhlayiya ezincane nendawo ethile ephezulu zinokusebenza okungcono kwesilinganiso.Ngaphezu kwalokho, ukumelana ne-electrode surface (ngenxa yefilimu ye-SEI) kanye ne-electrode conductivity nakho kuthinta ukusebenza kwezinga.

Ngokufanayo nempilo yomjikelezo nokunwetshwa, i-electrode eyi-isotropic negative ineziteshi eziningi zokuthutha ze-lithium ion, ezixazulula izinkinga zokungena okuncane kanye namazinga aphansi okusabalalisa esakhiweni se-anisotropic.Izinto ezisetshenziswayo eziningi zisebenzisa ubuchwepheshe obufana nembudumbudu kanye nokunameka ukuze kuthuthukiswe izinga lokusebenza kwazo.

I-HCMilling(Guilin Hongcheng) ingumkhiqizi wemishini yokugaya ye-anode.Uchungechunge lwe-HLMXizinto ze-anode super-isigayo esihle esime mpo, HCHizinto ze-anode i-ultra-fine millnezinye izigayo zokugaya i-graphite ezikhiqizwa yithi ziye zasetshenziswa kabanzi ekukhiqizeni izinto ze-graphite anode.Uma unezidingo ezihlobene, sicela usithinte ukuze uthole imininingwane yesisetshenziswa futhi usinikeze imininingwane elandelayo:

Igama lempahla eluhlaza

Ubunono bomkhiqizo(imeshi/μm)

umthamo (t/h)