Aqueous Ni-rich-cathode dispersions processed with phosphoric acid for lithium-ion batteries with ultra-thick electrodes

Kukay, Alexander; Sahore, Ritu; Parejiya, Anand; Hawley, W. Blake; Li, Jianlin; Wood, David L.

doi:10.1016/j.jcis.2020.07.144

Cited by 44 publications

(45 citation statements)

References 28 publications

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“…题，如 NMP 在后续干燥和溶剂回收中耗时长、能耗占比高(~46.8%) [5] 。相比油性浆料，水性浆料具有低成本、无需溶剂回收、环境友好等优势 [32,33] ，并广泛应用于石墨、硅基等负极浆料的制备 [34] 。但水性溶剂规模化应用仍存在巨大挑战，包括浆料与集流体间润湿性和黏附性能差、二次粒子团聚、锂离子从正极析出导致活性颗粒破坏和集流体腐蚀，以及更严格的干燥过程(水含量 <400 ppm) [35,36]…”

Section: 定科技专项，包括我国《新能源汽车产业发展规划(2021-2035 年)》，美国能源部的 Battery 500，unclassified

Microstructure evolutions in lithium ion battery electrode manufacturing

Li¹,

Zhang²,

Wang³

et al. 2021

Chin. Sci. Bull.

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Since its commercialization in the 1990s, the lithium-ion battery has been a huge success in the energy industry owing to its high energy density and long cycle life. They have been used in national strategic fields, such as satellites and unmanned aircraft, to promote a remarkable leap forward in new energy, new energy vehicles, and other emerging industries. Therefore, the development of lithium-ion batteries is a strategic high ground for competition among countries worldwide.The development and widespread use of lithium-ion batteries is driven by their high energy/power density, long cycle life, and low cost, which requires battery material innovation as well as advancements in manufacturing processes and equipment technology. Particularly, the power and energy storage applications require numbers of battery cells connected in series or parallel. High precision is required to ensure the consistency of the battery cell, to avoid module capacity loss and cycle life attenuation owing to the "shortboard effect," and to ensure battery safety. Electrode manufacturing, which is the first critical process of lithium-ion battery production, consists of three critical steps: mixing, coating, and rolling. The positive and negative electrode active materials, conductive agents, binders and solvents are mixed into slurry and coated on copper or aluminum foil. The positive/negative electrodes, which constitute the electrochemical reaction carrier and the battery's core, are obtained after drying and roller compaction. The porous and multi-component electrode microstructure evolves and is constructed in a complex way during electrode manufacturing. The proportion of electrode slurry, mixing order, coating method, drying strategy, and rolling process can considerably affect the evolution of electrode microstructure, such as pore structure, active particle distribution and, conductive/bonding network. It also influences the lithium-ion battery's electrochemical performance. Despite tremendous advances in high-energy-density materials, research on lithium-ion battery manufacturing lags, resulting a large gap between laboratory and production scales.This requires an in-depth understanding of the manufacturing and the relationship between electrode microstructure evolution and battery performance.The advancement and application of cutting-edge slurry mixing, coating, and calendering technologies in electrode manufacturing are thoroughly reviewed in this paper. The evolution of electrode microstructure during manufacturing, in particular, and its impact on the battery's electrochemical performance, are discussed in detail. Then, various novel electrode manufacturing techniques are summarized in terms of their significance and challenges, covering the innovations based on the current process (aqueous processing, simultaneous double-sided slot coating, multilayer co-coating and, multistage drying), dry processing (electron beam and ultraviolet curing forming, electrostatic dry-powder coating), threedimensional printing, template-ba...

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Section: 定科技专项，包括我国《新能源汽车产业发展规划(2021-2035 年)》，美国能源部的 Battery 500，unclassified

Microstructure evolutions in lithium ion battery electrode manufacturing

Li¹,

Zhang²,

Wang³

et al. 2021

Chin. Sci. Bull.

View full text Add to dashboard Cite

show abstract

“…To prevent the development of defects during and after the coating process, several strategies exist to regulate pH values during slurry mixing. The usage of different acids, such as phosphoric acid [6][7][8], hydrochloric acid [9,10], poly acrylic acid [11] or acetic acid [12] is the most common method for maintaining the pH of the slurry within an adequate range between 4 and 8.6. The utilization of certain acids has another positive effect on the Li + leaching mechanism.…”

Section: Introductionmentioning

confidence: 99%

Aqueous Manufacturing of Defect-Free Thick Multi-Layer NMC811 Electrodes

et al. 2022

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Manufacturing thick electrodes for Li-ion batteries is a challenging task to fulfill, but leads to higher energy densities inside the cell. Water-based processing even adds an extra level of complexity to the procedure. The focus of this work is to implement a multi-layered coating in an industrially relevant process, to overcome issues in electrode integrity and to enable high electrochemical performance. LiNi0.8Mn0.1Co0.1O2 (NMC811) was used as the active material to fabricate single- and multi-layered cathodes with areal capacities of 8.6 mA h cm−2. A detailed description of the manufacturing process is given to establish thick defect-free aqueous electrodes. Good inter-layer cohesion and adhesion to the current collector foil are achieved by multi-layering, as confirmed by optical analysis and peel testing. Furthermore, full cells were assembled and rate capability tests were performed. These tests show that by multi-layering, an increase in specific discharge capacity (e.g., 20.7% increase for C/10) can be established for all tested C-rates.

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“…The rich Li‐related residues cause high alkalinity in the prepared slurries. When those slurries are processed through the eco‐friendly water‐based course, the equilibrium pH would exceed 11, which can cause severe corrosion of the Al current collector during slurry casting and drying 13‐17 . Additionally, most NCM powders exhibit poor electronic and ionic conductivity 18,19 .…”

Section: Introductionmentioning

confidence: 99%

“…When those slurries are processed through the ecofriendly water-based course, the equilibrium pH would exceed 11, which can cause severe corrosion of the Al current collector during slurry casting and drying. [13][14][15][16][17] Additionally, most NCM powders exhibit poor electronic and ionic conductivity. 18,19 Based on the above considerations, we propose using carbon fabric (CF) woven from carbon fiber bundles with accessible pores to replace Al foil as the conductive matrix (ie, current collector) for Nirich NCM cathodes.…”

Section: Introductionmentioning

confidence: 99%

Using conductive carbon fabric to fabricate binder‐free Ni‐rich cathodes for Li‐ion batteries

Sireesha

2021

Intl J of Energy Research

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Summary Carbon fabric is proposed as an alternative current collector for fabricating water‐processed LiNi0.8Co0.1Mn0.1O2 (NCM811) cathodes in order to prevent electrode corrosion problems from the use of conventional Al foil. The interlaced fiber bundles in carbon fabric feature plenty of voids and a large surface area to accommodate electrode materials without requiring an insulating binder. Further, the connected network structure of carbon fabric serves as a three‐dimensional pathway for electron transport. However, our experiments also reveal the necessity to adopt a conductive agent, although a very high content of it reduces the uniform distribution of cathode materials. When increasing the content of conductive agent from 3% to 15%, capacity retention of the corresponding NCM811 cell rises from 76% to 93% after charge/discharge at 0.5 C for 300 cycles. The causes of this increase are discussed.

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Aqueous Ni-rich-cathode dispersions processed with phosphoric acid for lithium-ion batteries with ultra-thick electrodes

Cited by 44 publications

References 28 publications

Microstructure evolutions in lithium ion battery electrode manufacturing

Microstructure evolutions in lithium ion battery electrode manufacturing

Aqueous Manufacturing of Defect-Free Thick Multi-Layer NMC811 Electrodes

Using conductive carbon fabric to fabricate binder‐free Ni‐rich cathodes for Li‐ion batteries

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