Review—Knowledge-Based Process Design for High Quality Production of NCM811 Cathodes

Heck, Carina Amata; Horstig, Max-Wolfram von; Huttner, Fabienne; Mayer, Julian K.; Haselrieder, Wolfgang; Kwade, Arno

doi:10.1149/1945-7111/abcd11

Cited by 43 publications

(44 citation statements)

References 104 publications

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“…Cell safety is affected by increased internal cell pressure, caused by to the formation of gaseous hydrogen fluoride, as high internal cell pressure can lead to cell bursting. In addition, the acidic hydrogen fluoride can promote decomposition and corrosion of the active materials [12–14] . The compounds resulting from high residual moisture contents can impede the formation of a stable solid electrolyte interface (SEI), which protects the anode against the electrolyte, or affect an already existing SEI.…”

Section: Introductionmentioning

confidence: 99%

Design of Vacuum Post‐Drying Procedures for Electrodes of Lithium‐Ion Batteries

Huttner

Marth

Eser

et al. 2021

Batteries & Supercaps

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In order to reduce the residual moisture in lithium‐ion batteries, electrodes and separators need to be post‐dried prior to cell assembly. On an industrial scale, this is often conducted batch‐wise in vacuum ovens for larger electrode and separator coils. Especially for electrodes, the corresponding post‐drying parameters have to be carefully chosen to sufficiently reduce the moisture without damaging the sensitive microstructure. This requires a fundamental understanding of structural limitations as well as heat transfer and water mass transport in coils. The aim of this study is to establish a general understanding of the vacuum post‐drying process of coils. Moreover, the targeted design of efficient, well‐adjusted and application‐oriented vacuum post‐drying procedures for electrode coils on the basis of modelling is employed, while keeping the post‐drying intensity as low as possible, in order to maintain the sensitive microstructure and to save time and costs. In this way, a comparatively short and moderate 2‐phase vacuum post‐drying procedure is successfully designed and practically applied. The results show that the designed procedure is able to significantly reduce the residual moisture of anode and cathode coils, even with greater electrode lengths and coating widths, without deteriorating the sensitive microstructure of the electrodes.

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Section: Introductionmentioning

confidence: 99%

Design of Vacuum Post‐Drying Procedures for Electrodes of Lithium‐Ion Batteries

Huttner

Marth

Eser

et al. 2021

Batteries & Supercaps

Self Cite

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“…Studies have shown that nickel-rich materials such as LiNi 0,8 Mn 0,1 Co 0,1 O 2 (NMC 811) are sensitive to moisture and environmental conditions. [38,[60][61][62] To be able to track the possible influence of the production environment on the quality of the produced electrodes, parameters such as the type of the production environment, including a clean room or dry room with a specific dew point, the temperature of the room, and atmospheric humidity and pressure should be taken into account. [63]…”

Section: Raw Materials and Production Environmentmentioning

confidence: 99%

Tailored Digitalization in Electrode Manufacturing: The Backbone of Smart Lithium‐Ion Battery Cell Production

et al. 2022

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Following the introduction of Industry 4.0 and the development of information technologies, manufacturing companies have been undergoing a profound transformation. This transformation envisions the realization of the smart factory as a fully connected, flexible production system regulated by data. Digitalization and collection of the critical parameters are the vital prerequisites for this vision. Electrode manufacturing is regarded as the core phase in the battery cell production, having most of the properties determining the electrochemical performance of the battery cell established in this phase. There are a high number of parameters involved in electrode manufacturing. The digitalization of these parameters is associated with a considerable amount of effort and costs. Introducing a tailored digitalization concept provides the first step toward smart battery cell production. The tailored digitalization concept is based on the importance of the parameters from the quality management perspective and their complexity with regard to digitalization. The prioritization of parameters enables a successive quality‐oriented digitalization strategy. The concept is built on a two‐step literature‐based and expert‐based approach. The results include a comprehensive list of parameters and their prioritization for digitalization and integration in a tracking and tracing concept.

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“…4,5 As a determining factor for electrochemical performance of LIBs, the cathode side has attracted great research interest over the years. [6][7][8][9] So far, a large variety of promising high-energy cathode materials have been developed for LIBs, which could be roughly divided into three categories according to their crystal structures, including layered oxides (such as LiCoO 2 , 10,11 LiNi 0.8 Co 0.1 Mn 0.1 O 2 , 12,13 ), and olivine phosphates (such as LiFePO 4 22,23 ). However, the climbing of the energy density of cathode materials usually implies high capacity or high working voltage, which makes the cathode materials harmfully unstable, aggravating the capacity fading of LIBs.…”

Section: Introductionmentioning

confidence: 99%