Combined dilatometry and voltage analysis for a reliable detection of lithium deposition on graphitic anodes

“…When the deposited lithium loses electrical contact with the anode, the lithium becomes electrically isolated and inactive, which is then referred to as dead lithium [64]. Deposition onto the graphite surface also results in higher volume expansion than intercalation into the active material, imposing additional mechanical stress on the components of the cell [65].…”

Section: Relaxation Measurementmentioning

confidence: 99%

Aging Determination of Series-Connected Lithium-Ion Cells Independent of Module Design

et al. 2023

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In this work, a battery consisting of eight commercial NMC/graphite cells connected in series was cycled to 60% of its initial capacity. During the test, special care was taken to ensure that the results were not influenced by either the module assembly or the module design. For this purpose, the cells were virtually connected in a laboratory environment with the help of the test device as if they were operated together in a battery. Extrinsic influences that affect cell aging were thus reduced to a minimum. Differential Voltage Analysis (DVA), Electrochemical Impedance Spectrum (EIS), and relaxation measurements were performed to analyze the aging behavior of each cell. The results show that despite a theoretically perfect module design, Cell-to-Cell Variations (CtCV) occurred during aging. The shifting Depth of Discharge (DoD) values among the cells further amplify CtCV. Lithium plating was also observed in the faster aging cells after cyclic aging, suggesting that this aging effect contributes significantly to the development of CtCV. After the aging test, the battery was equipped with an active balancing system that maximizes capacity utilization. More important, the balancing charges which are calculated iteratively within the used balancing algorithm show a strong correlation to the pure capacity losses and thus provide a new way to determine the capacity values of each cell individually without disassembling the battery.

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Section: Theoretical and Experimental Research Techniquesmentioning

confidence: 99%

“…Based on this, Katzer's group [71] developed a new detection algorithm that can achieve automatic detection with high sensitivity. This group [72] proposed a Bayes algorithm using a combination of voltage and dilation data to detect Li deposition with sensitivity and specificity. They [73] also proposed a sensitive, reliable, and automated operand detection method based on impedance relaxation properties.…”

Section: Theoretical and Experimental Research Techniquesmentioning

confidence: 99%

Fast‐Charging Strategies for Lithium‐Ion Batteries: Advances and Perspectives

Zhao

Song

2022

ChemPlusChem

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Rapid development of high-energy-density lithium-ion batteries (LIBs) enables the sufficient driving range of electric vehicles (EVs). However, the slow charging speed restricts the popularization of EVs. Commitment to fast-charging research is considered to be the key to advance the EVs strategy. This Review discusses the kinetic factors limiting the fast-charging capability at the material aspects, and summarizes the recent research strategies to achieve fast-charging performance of high-energy-density LIBs through electrode engineering, electrolyte design, and interface optimization. The increasingly important role of computational tools and advanced characterization techniques in fundamentally understanding the failure mechanism of LIBs is emphasized, and the analysis of the thermal runaway problem in the fast-charging process and the corresponding thermal optimization scheme is also involved to give the guidance for the more rational battery design. In view of these factors and strategies, some future perspectives for realizing high-performance fast-charging LIBs are proposed, which are expected to facilitate the large-scale application of fast-charging LIBs in EVs.

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Combined dilatometry and voltage analysis for a reliable detection of lithium deposition on graphitic anodes

Cited by 12 publications

References 31 publications

Revealing the onset condition of Li plating on graphite electrodes under fast-charging

Revealing the onset condition of Li plating on graphite electrodes under fast-charging

Aging Determination of Series-Connected Lithium-Ion Cells Independent of Module Design

Fast‐Charging Strategies for Lithium‐Ion Batteries: Advances and Perspectives

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