The investigation on degeneration mechanism and thermal stability of graphite negative electrode in lithium ion batterie
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ORIGINAL PAPER
The investigation on degeneration mechanism and thermal stability of graphite negative electrode in lithium ion batteries from electric logistics vehicles Zhen Wang 1 & Kangkang Wang 2 & Fei Gao 2 & Jianling Li 1 Received: 17 May 2020 / Revised: 19 July 2020 / Accepted: 5 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In the new energy vehicle field, the lithium ion batteries (LIBs) are widely used as energy storage devices. In this paper, the decay characteristics and thermal stability of LIBs’ negative electrode with capacity retention rate (CRR) 60–100% were studied. The lithium content and polarization impedance of the negative electrode were analyzed by constant current charge/discharge test, the inductively coupled plasma–optical emission spectrometer test and impedance test. The result reveals that the capacity loss caused by the active lithium loss mainly occurs before 80% CRR, and the deterioration of kinetic performance is the main reason for capacity loss of negative electrode with 80–60% CRR. Surface composition, structure changes, and thermal stability of the negative electrode were analyzed by scanning electron microscope, X-ray photoelectron spectroscopy, X-ray diffraction, and differential scanning calorimetry. The results show that the SEI film becomes more inorganic and its conductivity of lithium ions decreases as the capacity retention rate declines, which have an important effect on the kinetic performance of negative electrode. The thermal stability of the negative electrode also decreased significantly because of the loose secondary SEI film formation at elevated temperature. Keywords Electric logistics vehicles . Lithium ion battery . Negative electrode . Degeneration mechanism . Thermal stability
Introduction Lithium ion batteries (LIBs) have the characteristics of high power density, large capacity, and environmental friendliness, which are widely used in new energy vehicles such as the electric bus, the electric car, and the electric logistics vehicle (ELV) [1–3]. However, the mismatch between the service life of the application devices and the battery life limits the development of electric vehicles, which is a challenge for the use of Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11581-020-03804-1) contains supplementary material, which is available to authorized users. * Jianling Li [email protected] 1
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, No. 30 College, Road, Haidian District, Beijing 100083, China
2
State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems, China Electric Power Research Institute, Beijing 100192, China
batteries [4, 5]. In addition, the batteries, which suffer the calendar aging and the cycle aging, affect the power performance and safety of vehicles. As a result, it becomes necessary to investigate the degeneration mechanism and improve the lifetime of batteries At prese
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