Ubunifu wa uso wa nyenzo za anodi

2025-03-26

Katika hatua hii, betri za lithium ion zimeonyesha matumizi makubwa sana, na nyenzo za anodi ni moja ya mambo muhimu yanayoamua utendaji wa electrochemical wa betri za lithium ion kama vile uhifadhi na ubadilishaji wa nishati. Kupitia ubunifu wa uso wa nyenzo za anodi za kaboni, utendaji wa betri za lithium ion unaweza kuboreshwa kwa ufanisi. Kama vile kuboresha uwezo maalum, ufanisi wa kwanza wa coulomb, ufanisi wa chaji na discharge, utendaji wa kiwango, uthibitisho wa mzunguko, usalama, kuongezea muda wa huduma. Mbinu na michakato ya ubunifu wa uso hasa ni pamoja na mipako ya uso, matibabu ya kimaumbile na doping ya elementi:

(1) Surface coating: a “protective film” is constructed to cover the graphite surface to form a “core-shell structure”, which can avoid the peeling of graphite lamellae caused by solvation and improve the cycle stability of electrode materials. The coating of metal and its oxide can also reduce the resistance of lithium ion transfer and charge migration and improve the electrochemical performance of graphite materials.

(2) Chemical treatment: surface oxidation introduces oxygen-containing functional groups, increases the active site, forms a stable SEI film at the interface between anode material and electrolyte, and improves the cycle stability of carbon anode. Surface halogenation can form a passivation film with high intermolecular force on the surface of the material, which can improve the stability of the microcrystalline structure.

(3) Dopingi ya elementi: elementi za chuma au zisizo za chuma zinaingizwa katika nyenzo za anodi ya kaboni kubadilisha muundo na mpangilio wa elektroni wa microcrystals za kaboni, hivyo kuboresha tabia ya electrochemical ya kuondolewa na kuingizwa kwa ioni za lithiamu katika nyenzo za anodi.

Ufanisi wa electrochemical wa nyenzo za anodi ya kaboni unaweza kuimarishwa kwa kiasi kikubwa baada ya mabadiliko ya uso, lakini kazi halisi na udhibiti wa kila njia ya mabadiliko bado utaathiri athari ya mwisho ya mabadiliko. Kwa mfano, unene wa safu ya mipako, kiwango cha matibabu ya kemikali na usawa wa kipimo cha dopingi ya atomi za kigeni, usambazaji na usambazaji utaathiri utendaji wa mwisho wa nyenzo. Ikiwa udhibiti si mzuri, utendaji wa betri ya ioni za lithiamu hautaboreshwa, bali utendaji wa electrochemical utaharibika.