Drying and moisture resorption behaviour of various electrode materials and separators for lithium-ion batteries

Stich, Michael; Pandey, Nisrit; Bund, Andreas

doi:10.1016/j.jpowsour.2017.08.009

Cited by 58 publications

(69 citation statements)

References 21 publications

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“…The water, in turn, gets into the electrodes through various paths. Partially, it is already brought into the electrode structures by the initial materials, which store water from their surrounding atmosphere . In addition, water can be added during the liquid processing of the coatings .…”

Section: Introductionsupporting

confidence: 85%

“…Nevertheless, the process chain of the manufacturing of LIBs is very long and complex, and is subjected to various internal and external influences. Therefore, to meet the increasing demands on battery lifetime, safety, reliability, cycling capability, and specific energy and power, a highly reproducible manufacturing process of LIBs and stringent quality control are essential …”

Section: Introductionmentioning

confidence: 99%

“…In this regard, one of the quite critical pollutants in LIBs is water . There are several ways for water to get inside the battery cells.…”

Section: Introductionmentioning

confidence: 99%

“…Partially, it is already brought into the electrode structures by the initial materials, which store water from their surrounding atmosphere . In addition, water can be added during the liquid processing of the coatings . At industrial scales, electrodes for LIBs are produced by coating a slurry with organic solvents as N ‐methyl‐2‐pyrrolidone (NMP) or water onto a current collector.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Different Post‐Drying Procedures on Remaining Water Content and Physical and Electrochemical Properties of Lithium‐Ion Batteries

2019

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The post‐drying of electrodes and separators for lithium‐ion batteries just before cell assembly aims at reducing the water content in the cells below a critical value. This is important as the remaining water can lead to cell degradation and thus cause a safety risk. In addition, it can impede the formation of an effective solid electrolyte interface. Nevertheless, the post‐drying of lithium‐ion battery electrodes and separators is still poorly investigated. Considering this, three different post‐drying procedures are investigated on pouch cells and compared with the non‐post‐dried state. The remaining water contents are measured via coulometric Karl Fischer Titration and correlated to the resulting electrochemical performance. Surprisingly, the most intensely post‐dried cells show the worst electrochemical performance despite reaching the lowest water content. In contrast, the mildest post‐dried cells, which show the highest water content, achieve the best electrochemical performance. Further analyses show that extreme post‐drying can cause irreparable damages within the electrode structures. Therefore, a good electrochemical performance is not only guaranteed by low remaining water content but also, in particular, by gentle post‐drying.

show abstract

Section: Introductionsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

“…In this regard, one of the quite critical pollutants in LIBs is water . There are several ways for water to get inside the battery cells.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Influence of Different Post‐Drying Procedures on Remaining Water Content and Physical and Electrochemical Properties of Lithium‐Ion Batteries

2019

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“…This method is based on a technique developed by Karl Fischer to determine the water content in sulfur dioxide . Recent studies use this measurement technique to derive values for the moisture uptake of various electrodes …”

Section: Introductionmentioning

confidence: 99%

Moisture Adsorption Behavior in Anodes for Li‐Ion Batteries

et al. 2019

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Excessive moisture adsorbed in electrodes and separators of a Li‐ion battery hampers its performance and is, therefore, removed to a certain amount in a post‐drying process. An insufficient understanding of the process results thereby in high process costs. Cost reductions can only be achieved efficiently with an improved process understanding by modeling this post‐drying process. As process modeling requires knowledge of sorption equilibria of water in the components of the battery, the sorption equilibria of water in different anodes are determined by means of a magnetic suspension balance and compared with different experimental setups. The measured data of the adsorption isotherms are described mathematically and give an impression of the amount of moisture, which is going to adjust at an equilibrium starting from a dry anode. Moreover, the materials of the anode are evaluated for their moisture sorption behavior. It is shown that mass‐weighted sorption equilibria of water in the materials yield a good approximation of equivalent equilibria in the anode. In the investigated anodes, the binder and rheology additive carboxymethyl cellulose (CMC) accounts for the most water uptake.

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Assessment of “Inverse” Cross‐Talk (Anode to Cathode) in High‐Voltage Li/Mn‐Rich Layered Oxide || Li Cells

Arifiadi,

Demelash,

Abke

et al. 2024

Adv Funct Materials

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Li/Mn‐rich layered oxide (LMR) offers high practical discharge capacity originating from both cationic and anionic redox, but its operation is practically challenging as full capacity utilization at high cathode potentials (> 4.6 V vs Li|Li+) is intertwined with phase transformation, oxygen release, and transition metal dissolution. Dissolved TMs in particular, can deposit and damage the anode via a process known as electrode cross‐talk that decreases Li inventory due to Li plating. Given the excess in active lithium, Li‐metal anode (LMA) is frequently paired with LMR for a systematic cathode R&D, though is believed to cause inverse cross‐talk, i.e., diffusion of LMA degradation products from the solid electrolyte interphase (SEI) toward the cathode, triggering bulid‐up of resistive cathode electrolyte interphase (CEI). Indeed, a thicker, more organic‐based, and slightly resistive CEI is proven in Li‐ compared to “SEI‐poor” Li4Ti5O12 (LTO)‐based cells via X‐ray photoelectron spectroscopy, time‐of‐flight secondary ion mass spectrometry, and electrochemical techniques, which likely even decreases metal dissolution from LMR, though their practical impact on overpotential is shown to be less relevant. The capacity recovery after transferring cycled (“old”) LMR from Li cells to fresh Li cells rather points to other meaningful contributions to capacity fading than the inverse crosstalk.

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Drying and moisture resorption behaviour of various electrode materials and separators for lithium-ion batteries

Cited by 58 publications

References 21 publications

The Influence of Different Post‐Drying Procedures on Remaining Water Content and Physical and Electrochemical Properties of Lithium‐Ion Batteries

The Influence of Different Post‐Drying Procedures on Remaining Water Content and Physical and Electrochemical Properties of Lithium‐Ion Batteries

Moisture Adsorption Behavior in Anodes for Li‐Ion Batteries

Assessment of “Inverse” Cross‐Talk (Anode to Cathode) in High‐Voltage Li/Mn‐Rich Layered Oxide || Li Cells

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