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18650 lityum-iyon ve 6HR61 nikel-metal hidrit tekrar şarj edilebilir pillerinin elektrokimyasal empedans analizi

Bu çalışmada ikincil piller arasında yaygın olarak kullanılan ticari 18650 lityum-iyon ve 6HR61 nikel-metal hidrit pillerinin aynı hücre potansiyeli, sabit sıcaklık ve frekans aralığındaki elektrokimyasal empedans analizi gerçekleştirilmiştir. Bu iki tekrar şarj edilebilir pilin empedans cevapları ve geliştirilen eşdeğer devre modeli ile pillerin önemli fiziksel parametreleri saptanmıştır. Elde edilen parametreler ile pillerin enerji depolama sistemlerinde tercih edilebilirliğini önemli ölçüde belirleyen performans ve kapasite özellikleri kıyaslanmıştır. Bunun sonucunda, lityum-iyon pilinin nikel-metal hidrit piline göre birçok üstün özelliğe sahip olduğu belirlenmiştir. Ayrıca, kullanılan elektrokimyasal empedans spektroskopi tekniği ile geliştirilen modelin, enerji ihtiyacının karşılanması ve gelecekte üretilecek pillerin tasarımı için etkili olabileceği ve büyük bir potansiyele sahip olduğu ortaya konmuştur.

Anahtar Kelimeler:

empedans spektroskopisi, tekrar şarj edilebilir pil, eşdeğer devre, pil performansı, gözenekli elektrot

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