He aha ke kumu o ka nui o ka pākaukau lithium?

ଲେଖକ: ଆଇଫ୍ଲୋପାୱାର - Προμηθευτής φορητών σταθμών παραγωγής ενέργειας

Wahi a nā hōʻike, ʻo ka hiki ke hoʻokuʻu ʻia o ka pā lithium-ion ma kahi o 31.5% wale nō ma ka lumi wela ma -20 ¡ã C. ʻO ka mahana hana maʻamau lithium-ion ma waena o -20 ~ + 55 ¡ã C.

Akā, ma ka ʻāpana o ka aerospace, nā kaʻa uila, pono e hana pono ka pākaukau ma -40 ¡ã C. No laila, he mea nui ka hoʻomaikaʻi ʻana i nā waiwai haʻahaʻa haʻahaʻa o nā pā lithium ion. Ma nā wahi wela haʻahaʻa, piʻi ka viscosity o ka electrolyte, ʻoiai i hoʻopaʻa ʻia i kahi hapa, e hopena i kahi haʻahaʻa haʻahaʻa o ka pā lithium ion.

ʻO ka hoʻohālikelike ʻana ma waena o ka electrolyte a me ka electrode maikaʻi ʻole a me ka diaphragm e hōʻemi ʻia i kahi ʻano wela haʻahaʻa. ʻO ka electrode maikaʻi ʻole o ka pā lithium ion ma lalo o nā kaiapuni haʻahaʻa haʻahaʻa ua hoʻoheheʻe ʻia, a ua hoʻopili ʻia ka lithium metala i hoʻoheheʻe ʻia me kahi electrolyte, a ua hoʻoiho ka huahana i kahi mānoanoa electrolyte interface (SEI). ʻO nā pākahi Lithium-ion ma lalo o ka haʻahaʻa haʻahaʻa haʻahaʻa e hōʻemi i ka ʻōnaehana diffusion o loko o ka mea hana, ua hoʻonui nui ʻia ka impedance transfer charge (RCT).

Manaʻo loea 1: Hoʻopilikia ka hopena electrolyne i ka hana haʻahaʻa haʻahaʻa o nā pā lithium ion, ʻo ka haku mele ʻana a me nā waiwai waiwai o ka electrolyte he hopena maikaʻi ʻole i ka hana haʻahaʻa haʻahaʻa haʻahaʻa. ʻO ka pilikia ma ka ʻili o ka pākaukau: e lilo ka viscosity o ka electrolyte i mea nui, ua lohi ka conductivity ion, ka hopena i ka wikiwiki o ka neʻe ʻana o ka electron o ke kaapuni waho, no laila ua polarized nui ka pākaukau, a ʻoi aku ka emi ʻana o ka uku a me ka hoʻokuʻu ʻana. ʻOi loa i ka wā e hoʻopiʻi ana i ka haʻahaʻa haʻahaʻa, hiki i nā lithium ions ke hana maʻalahi i nā delegane lithium ma ka ʻili o ka electrode maikaʻi ʻole, e hopena i ka pau ʻole o ka pā.

ʻO ka hana haʻahaʻa haʻahaʻa o ka electrolyte e pili kokoke ana i ka nui o ka electrolyte pono&39;ī conductivity, wikiwiki ka hoʻouna ʻana i ka ion o ka conductivity uila, a ʻoi aku ka nui o ka hiki ke hoʻohana ʻia i nā haʻahaʻa haʻahaʻa. ʻOi aku ka nui o nā paʻakai lithium i ka electrolyte, ʻoi aku ka nui o ka neʻe ʻana, ʻoi aku ka kiʻekiʻe o ka conductivity. Kiʻekiʻe uila conductivity, ʻoi aku ka wikiwiki o ka ion conductivity, ʻoi aku ka liʻiliʻi o ka polarization, ʻoi aku ka maikaʻi o ka hana o ka pākaukau ma ka wela haʻahaʻa.

No laila, ʻo ka conductivity kiʻekiʻe kahi kūlana kūpono no ka hoʻokō ʻana i ka hana haʻahaʻa haʻahaʻa maikaʻi o nā pā lithium ion. ʻO ka conductivity uila o ka electrolyte e pili ana i ke ʻano o ka electrolyte, a ʻo ka viscosity o ka solvent e hoʻomaikaʻi i ke ala o ka conductivity uila electrolyte. ʻO ka fluidity o ka solvent maikaʻi ma kahi haʻahaʻa haʻahaʻa o ka solvent ka mea e hōʻoiaʻiʻo ai i ka lawe ʻana i ka ion, a ʻo ka membrane electrolyte paʻa i hana ʻia e ka electrolyte i ka haʻahaʻa haʻahaʻa he kī hoʻi ia e hoʻopili ai i ka conductance lithium ion, a ʻo RSEI kahi impedance paʻa o kahi pākaukau lithium ion i kahi haʻahaʻa haʻahaʻa haʻahaʻa.

Manaʻo 2: ʻO nā mea ʻono e kaupalena i ka haʻahaʻa haʻahaʻa haʻahaʻa haʻahaʻa haʻahaʻa haʻahaʻa haʻahaʻa haʻahaʻa haʻahaʻa haʻahaʻa, Li + diffusion impedance, akā ʻaʻole SEI kiʻiʻoniʻoni. Loaʻa i ka ʻōnaehana papa ʻelua kahi kaila lithium-ion diffusion hoʻokahi-dimensional, nona kahi ʻano paʻa o ke kahawai ʻekolu-dimensional, a ʻo ia ka mea kūʻai mua loa i ka pākaukau lithium ion. ʻO kona mau mea i hōʻike ʻia ʻo LiCoO2, Li (CO1-XNIX) O2 a me Li (Ni, Co, Mn) O2, e.