Izinhlelo zokusebenza zokuminyana kwamandla aphezulu

ihlaziye umthamo wokugcina amandla, ukuqina kanye nedatha yezindleko zebhethri. Njengamanje, ibhethri ye-lithium ephezulu kakhulu yamandla aphezulu isebenzisa i-lithium transition metal oxide LiMo2 (M=Ni, Co kanye ne-Mn noma i-Al) njengedatha yomsebenzi we-cathode (≈150? 200mahG-1 umthamo wokukhipha osebenzayo) 1? I-graphite (ethiyori Umthamo othize ungu-372mahG-1) njengedatha yomsebenzi we-anode. Ukwengeza ingxenye ye-silicon (mayelana ne-li15si4, i-3579mahgsi? 1) kubonakale kuyisu elisebenzayo lokwandisa amandla athile. Isibonelo, u-Yim et al. kusetshenziswe idatha eyinhlanganisela ye-graphite ne-silicon powder (5% wt%) ukulungisa nokuhlola i-polyvinyl imine adhesive anode. Ngemuva kwemijikelezo engu-350, i-electrode ephumelela kakhulu inomthamo othize we-514 mahG-1, izikhathi ezingu-1.6 ze-graphite anode zezohwebo, kusho umbhali. Kodwa-ke, ukuqeda umjikelezo wokuphepha wokuqukethwe okuphezulu nomthwalo we-silicon anode kuyinselele kakhulu. Ukukhubazeka okubi kakhulu kwe-silicon njengedatha yomsebenzi we-anode yilezi: (I) ukungahlehliseki okuphezulu, ikakhulukazi emijikelezweni emibili yokuqala, njengokusabela kwezinhlangothi nge-electrolyte; (II) kanye ne-lithium ngemva kokuhlanganiswa, ukuguqulwa kwevolumu kukhulu, okuholela ekuqhekekeni kwezinhlayiya kanye ne-anode self-pulverizes.

Kumele kuqashelwe ukuthi yonke le miphumela ehlanekezelwe ngeke ibangele kuphela ukuqoqwa okukhulu kwe-impedance ngesikhathi sokusebenza kwebhethri, kodwa futhi ibangele ukuchithwa kwe-cathode lithium. Ngaphezu kwalokho, ukulahlekelwa kokuthintana kwezinhlayiya ze-silicon kunethiwekhi ye-carbon black/binder kanye/noma umqoqi kuzosheshisa ukuwohloka kwamandla. Eminyakeni yamuva nje, ama-electrolyte amasha kanye/noma athuthukisiwe, izithasiselo nama-polymer binders ahlolwe ukuze anqobe izinkinga ezinkulu ze-silicon anode. 11, 13, 15? 17 Ngaphezu kwalokho, kugxilwe ekulungiseleleni idatha yekhwalithi ephezulu ye-silicon-based redox. Ngokombono walezi zifundo, ezimbalwa kuphela zazo ezicatshangelwayo lapha. Ikakhulukazi, idatha ye-silicon ne-SiOx kanye nedatha yabo eyinhlanganisela, ikakhulukazi i-carbon nanoparticles, inamathemba abanzi ekusetshenzisweni kokugcina amandla esikhathini esizayo. Ngokwesibonelo, 18-21, Breitung et al. ikhiqize izinto eziyinhlanganisela yezinhlayiya ze-silicon nama-carbon nanofibers. Ngemva kwamakhulu emijikelezo, umthamo wayo wawucishe uphindwe kabili kunewokuqala wezinhlayiyana ze-silicon. Imiphumela ibonisa ukuthi ukugcinwa kwamandla ezinhlayiya ze-silicon ehlanganiswe ne-carbon kuyathuthukiswa ngemva kokuba i-glucose ilungiswe ngendlela ye-hydrothermal. Ikhuthazwe yilezi zifundo, inhloso yalolu cwaningo ukusebenzisa izinhlayiya ze-silicon ezimbozwe ngaphambili ze-polymer ukuze kulungiswe izinhlanganisela ze-nano-si/C ngesakhiwo segobolondo eliwumgogodla. I-electron microscopy, i-X-ray diffraction kanye ne-Raman spectroscopy zisetshenziswe ukuveza amasampula empushana ekhabhoni ku-700~900℃. Indlela yengcindezi ye-in situ, i-electrochemical mass spectrometry ehlukile kanye nendlela yokuphuma kwe-acoustic yasetshenziselwa ukuhlaziya ukunwetshwa kwevolumu, ukuziphatha kokungena kanye nokuziphatha komshini wokuguqula / ukuwohloka kwezinhlayiya ezihlanganisiwe ze-si / C ku-electrode yangempela.