Nā mea noiʻi mai kaKe Kulanui ʻenehana o Munich(TUM) a meKe Kulanui ʻo RWTH Aachenma Kelemania ua hoʻohālikelike i ka hana uila o nā pila sodium-ion ikehu kiʻekiʻe (SIB) me kahi pila lithium-ion ikehu kiʻekiʻe (LIB) o ka pae kiʻekiʻe me kahi cathode lithium-iron-phosphate (LFP).

Ua ʻike ka hui he ʻoi aku ka mana o ke kūlana o ka uku a me ka mahana i ke kū'ē ʻana o ka pulse a me ka impedance o nā SIB ma mua o nā LIB, hiki ke hoʻololi i nā koho hoʻolālā a hōʻike e pono paha i nā SIB nā ʻōnaehana hoʻokele mahana a me ka uku ʻoi aku ka maʻalahi e hoʻonui i ka hana, ʻoiai ma nā pae uku haʻahaʻa.

• No ka wehewehe hou aku i ke kū'ē ʻana o ka pulse: pili ka huaʻōlelo i ka nui o ka hāʻule ʻana o ke volta o ka pila ke hoʻopili ʻia kahi koi mana koke. No laila, hōʻike ka noiʻi ua ʻoi aku ka hopena o nā pila sodium-ion e ka pae hoʻouku a me ka mahana ma mua o nā pila lithium-ion.

Noiʻi:

"ʻIke pinepine ʻia nā pila sodium-ion [SIB] he pani hāʻule no nā LIB," wahi a nā kānaka ʻepekema. "Eia naʻe, ʻo nā ʻokoʻa o ke ʻano electrochemical o ka sodium a me ka lithium e pono ai nā hoʻololi ma ka anode a me ka cathode. ʻOiai no nā pila lithium-ion [LIB] hoʻohana pinepine ʻia ka graphite ma ke ʻano he mea anode, no nā SIB, ʻike ʻia ke kalapona paʻakikī i kēia manawa ʻo ia ka mea hoʻohiki nui loa no nā SIB."

Ua wehewehe pū lākou ua manaʻo ʻia kā lākou hana e hoʻopiha i kahi hakahaka i ka noiʻi, ʻoiai ʻaʻohe ʻike e pili ana i ke ʻano uila o nā SIB e pili ana i nā mahana like ʻole a me ke kūlana o nā uku (SOC).

Ua hana ke kime noiʻi, ma ke ʻano kūikawā, i nā ana hana uila ma nā mahana mai 10 degere C a i 45 degere C a me nā ana uila kaapuni hāmama o ke kelepona piha ma nā mahana like ʻole a me nā ana hapalua kelepona o nā kelepona pili ma 25 C.

"Eia kekahi, ua noiʻi mākou i ka mana o ka mahana a me ka SOC ma ke kū'ē pololei o kēia manawa (R DC) a me ka galvanostatic electrochemical impedance spectroscopy (GEIS)," wahi a ia. "No ka nānā ʻana i ka hiki ke hoʻohana ʻia, ka ikehu hiki ke hoʻohana ʻia, a me ka pono o ka ikehu ma lalo o nā kūlana loli, ua hana mākou i nā hoʻokolohua hiki ke hoʻololi ma ka hoʻopili ʻana i nā ʻano ukana like ʻole ma nā mahana like ʻole."

Ua ana nā kānaka noiʻi i kahi pākahi lithium-ion, kahi pākahi sodium-ion me kahi cathode nickel-manganese-hao, a me kahi pākahi lithium-ion me kahi cathode LFP. Ua hōʻike nā mea ʻekolu i ka hysteresis voltage, ʻo ia hoʻi, ua ʻokoʻa ko lākou voltage open-circuit ma waena o ka hoʻouka ʻana a me ka hoʻokuʻu ʻana.

"He mea hoihoi, no nā SIB, ʻo ka hysteresis ke hana nui ʻia ma nā SOC haʻahaʻa, ʻo ia hoʻi, e like me nā ana o ka hapalua cell, ma muli paha o ka anode kalapona paʻakikī," i hoʻokūpaʻa ai nā loea. "Hōʻike ka R DC a me ka impedance o ka LIB i ka hilinaʻi iki ʻana i ka SOC. I ka hoʻohālikelike ʻana, no nā SIB, piʻi nui ka R DC a me ka impedance ma nā SOC ma lalo o 30%, ʻoiai ʻo nā SOC kiʻekiʻe aʻe ka hopena ʻē aʻe a alakaʻi i nā waiwai R DC a me ka impedance haʻahaʻa."

Eia kekahi, ua hoʻomaopopo lākou ʻoi aku ka kiʻekiʻe o ka hilinaʻi ʻana o ka R_DC a me ka impedance no nā SIB ma mua o nā LIB. "ʻAʻole hōʻike nā hoʻāʻo LIB i kahi hopena koʻikoʻi o ka SOC ma ka pono o ka huakaʻi hele a hoʻi. I ka hoʻohālikelike ʻana, hiki i ka hoʻokele paikikala ʻana i nā SIB mai 50% a 100% SOC ke hōʻemi i nā pohō pono ma mua o ka hapalua i hoʻohālikelike ʻia me ka hoʻokele paikikala ʻana mai 0% a 50%," wahi hou a lākou, me ka ʻike ʻana e ulu nui ana ka pono o nā SIB i ka wā e hoʻokele paikikala ai i nā cell ma kahi pae SOC kiʻekiʻe aʻe i hoʻohālikelike ʻia me kahi pae SOC haʻahaʻa.