SEBUAH REVIEW: SPEKTROSKOPI IMPEDANSI ELEKTROKIMIA DAN APLIKASINYA DALAM BATERAI LITHIUM-ION

Keywords: Electrochemical Impedance Spectroscopy (EIS), Nyquist Plot, Lithium Ion Battery, State of Charge

Abstract

Abstrak

Dengan meningkatnya kebutuhan bahan penyimpan energi, baterai rechargeable lithium ion menjadi obyek yang banyak dipelajari. Banyak metoda yang digunakan untuk menyelidiki karakteristik elektrokimia dari baterai, salah satunya adalah Electrochemical Impedance Spectroscopy (EIS). Dengan EIS, informasi dari hubungan state of charge pada siklus tertentu baterai dengan resistansi elektrolit, resistansi film permukaan dan resistansi transfer muatan didapatkan dengan menggunakan rangkaian ekivalen yang sesuai dengan plot Nyquist. Pada artikel ini, perbandingan antara hasil karakterisasi EIS katoda LiCoO₂ dan LiNi_1/3Co_1/3Mn_1/3O₂ dalam baterai lithium ion juga dipaparkan berdasarkan laporan dari penelitian yang pernah dilakukan para peneliti sebelumnya. Telah dilaporkan bahwa nilai D_Li+ dari LiCoO₂ lebih besar daripada LiNi_1/3Co_1/3Mn_1/3O₂, dan nilai j₀ dari LiNi_1/3Co_1/3Mn_1/3O₂ lebih besar dari pada LiCoO₂.

 Kata Kunci: Electrochemical Impedance Spectroscopy (EIS), Plot Nyquist, Baterai Lithium Ion, State of Charge

Abstract

With increasing need for energy storage materials, rechargeable lithium ion battery become an object that is much studied. There are many methods that used to investigate electrochemical characteristic of battery, one of them is Electrochemical Impedance Spectroscopy (EIS). With the EIS, informations about relation between state of charge at some certain cycle of battery with electrolyte resistance, surface film resistance, and charge transfer resistance are obtained with modeling equivalent circuit according to the Nyquist plots. In tis article, a comparison between the results of EIS characterization of cathode LiCoO₂ and LiNi_1/3Co_1/3Mn_1/3O₂ in lithium ion battery is presented based on report studies that have been conducted by previous researcher. It has been reported that D_Li+ value of cathode LiCoO₂ is greater than D_Li+ value of cathode LiNi_1/3Co_1/3Mn_1/3O₂, and j₀ value of cathode LiNi_1/3Co_1/3Mn_1/3O₂ is greater than j₀ value of cathode LiCoO₂.  

 Keywords: Electrochemical Impedance Spectroscopy (EIS), Nyquist Plot, Lithium Ion Battery, State of Charge