Determination of the Differential Capacity of Lithium-Ion Batteries by the Deconvolution of Electrochemical Impedance Spectra

Dongxu Guo, Geng Yang, Guangjin Zhao, Mengchao Yi, Xuning Feng, Xuebing Han, Languang Lu and Minggao Ouyang
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Dongxu Guo: Department of Automation, Tsinghua University, Beijing 100084, China
Geng Yang: Department of Automation, Tsinghua University, Beijing 100084, China
Guangjin Zhao: State Grid Henan Electric Power Research Institute, Zhengzhou 450052, China
Mengchao Yi: College of Engineering, China Agricultural University, Beijing 100083, China
Xuning Feng: State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
Xuebing Han: State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
Languang Lu: State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
Minggao Ouyang: State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China

Energies, 2020, vol. 13, issue 4, 1-14

Abstract: Electrochemical impedance spectroscopy (EIS) is a powerful tool for investigating electrochemical systems, such as lithium-ion batteries or fuel cells, given its high frequency resolution. The distribution of relaxation times (DRT) method offers a model-free approach for a deeper understanding of EIS data. However, in lithium-ion batteries, the differential capacity caused by diffusion processes is non-negligible and cannot be decomposed by the DRT method, which limits the applicability of the DRT method to lithium-ion batteries. In this study, a joint estimation method with Tikhonov regularization is proposed to estimate the differential capacity and the DRT simultaneously. Moreover, the equivalence of the differential capacity and the incremental capacity is proven. Different types of commercial lithium-ion batteries are tested to validate the joint estimation method and to verify the equivalence. The differential capacity is shown to be a promising approach to the evaluation of the state-of-health (SOH) of lithium-ion batteries based on its equivalence with the incremental capacity.

Keywords: lithium-ion battery; electrochemical impedance spectroscopy; distribution of relaxation times; differential capacity; joint estimation; state-of-health evaluation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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