High speed remote laser cutting of electrodes for lithium-ion batteries: Anode

Lee, Dongkyoung; Patwa, Rahul; Herfurth, Hans; Mazumder, J.

doi:10.1016/j.jpowsour.2012.10.096

Cited by 62 publications

(31 citation statements)

References 29 publications

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“…Figure 9 shows this phenomenon more clearly. Clearance width was observed previously by Lee et al [10]. The clearance width ( ) can be derived from the measured top and kerf widths as follows (3) To see the effect of material properties on the clearance width, this model ignores the liquid and vapor phases.…”

Section: Resultsmentioning

confidence: 99%

“…Especially, the partial penetration and re-solidified dross may be created in this cross-sectional geometry. The Clearance width was observed previously by Lee et al [10]. The clearance width (w c ) can be derived from the measured top and kerf widths as follows…”

Section: Appl Scimentioning

confidence: 96%

“…Lee et al [2,10,11] proposed a mathematical model to understand multi-physical phenomena during the laser cutting of electrodes using a single mode fiber laser. This mathematical model is used to investigate the laser cutting on current collectors such as copper and aluminum [2], and composite laser cutting such as anode and cathode [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…This mathematical model is used to investigate the laser cutting on current collectors such as copper and aluminum [2], and composite laser cutting such as anode and cathode [10,11]. Furthermore, laser parameters are experimentally optimized for high speed remote laser cutting [12].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Laser Cutting Width of LiCoO2 Coated Aluminum for Lithium-Ion Batteries

Lee

Ahn

2017

Applied Sciences

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Lithium-ion batteries are widely used for many applications such as portable electronic devices and Electric Vehicles, because they have lighter weight, higher energy density, higher power density, and a higher energy-to-weight ratio than other types of batteries. Conventional contact-based cutting technology may be inefficient whenever cell design is changed since lithium-ion battery cells are not standardized. Furthermore, the conventional cutting may result in process instability and a poor cut quality due to the tool wear so that it leads to short circuits and local heat generation. These process instability and inefficiency may be solved by laser cutting due to advantages such as clean cutting edge, less deformation, applicability to almost all materials, possibility of precision processing, and easy modification of cutting path. Despite the importance of the laser cutting research, no clear definition of cutting widths has been presented, and there is lack of knowledge to understand the effect of laser parameters on cutting widths. Therefore, this research examines the surface of cathode cut by a laser and defines cutting widths such as top width, melting width, and kerf width. The relationship between the laser parameters and cutting characteristics with defined widths are studied. When the volume energy is less than 6.0172 × 10 10 J/m 3 , no active electrode material is removed. When the laser power is greater or equal to 100 W, both the top and melting widths are clearly observed. The laser power of 50 W can selectively ablate the active electrode material with the material removal rate of 32.14-55.71 mm 3 /min. The threshold volume energy to fully penetrate the 50 µm-thick current collector is between 9.6275 × 10 10 -8.0229 × 10 10 J/m 3 . All clearance width is less than 20 µm, while the clearance width interestingly exceeds 20 µm when the laser power is 200 W. The effect of material properties on heat transfer using the one dimensional transient semi-infinite conduction model is investigated. In addition, five types of physical characteristics are defined and discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Appl Scimentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of Laser Cutting Width of LiCoO2 Coated Aluminum for Lithium-Ion Batteries

Lee

Ahn

2017

Applied Sciences

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“…Laser intensity distribution can be expressed by a combination of a Gaussian beam profile and a Laguerre polynomial [15]. This expression can be written as…”

Section: Laser Power Input ( )mentioning

confidence: 99%

Investigation of Physical Phenomena and Cutting Efficiency for Laser Cutting on Anode for Li-Ion Batteries

Lee

2018

Applied Sciences

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Lithium-ion batteries have a higher energy density than other secondary batteries. Among the lithium-ion battery manufacturing process, electrode cutting is one of the most important processes since poor cut quality leads to performance degradation, separator protrusion, and local electric stress concentration. This may, eventually, lead to malfunction of lithium-ion batteries or explosion. The current mechanical cutting technology uses a contact process and this may lead to process instability. Furthermore, there are additional costs if the tools and cell design are changed. To solve these issues, laser cutting has been used. Conventional dependent parameters have limitations in investigating and explaining many physical phenomena during the laser cutting of electrodes. Therefore, this study proposes specific widths such as melting, top, and kerf width. Moreover, the relationship between laser parameters and multiphysical phenomena with the proposed widths are investigated. Five types of classification with regard to physical phenomena are presented and explained with SEM images. Cutting efficiency is estimated with the proposed widths. The proposed specific cutting widths, five types of geometrical classification, and cutting efficiency can be used as standardized parameters to evaluate the cutting quality.

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Next‐Generation Activated Carbon Supercapacitors: A Simple Step in Electrode Processing Leads to Remarkable Gains in Energy Density

Hwang

El‐Kady

et al. 2017

Adv Funct Materials

242

134

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as the active material, and aluminum current collectors and tetraethylammonium tetrafluoroborate in acetonitrile (ACN) as the electrolyte. [2] While these carbon supercapacitors demonstrate excellent electrochemical performance, the high cost per kWh has limited the widespread adoption of this technology. Compared to lithium-ion batteries, supercapacitors provide energy at ten times higher cost per kWh. [3] This not only is a major concern for capacitive energy storage, but also it prevents supercapacitors from replacing batteries in many applications. Here, we suggest two strategies for solving this problem. The first involves increasing the capacitance of carbon electrodes through a simple yet effective step in the electrode processing currently used in the manufacture of supercapacitors. The second strategy focuses on the use of redox-active electrolytes (RE), increasing capacitance and reducing cost of fabrication relative to the currently used more expensive organic electrolytes. Increasing the capacitance of carbon electrodes will reduce the cost of storing energy in supercapacitors.Although other forms of carbon such as carbon aerogels, carbon nanotubes, and graphene have been developed, activated carbon is still attractive because of its low cost and well-established electrochemical properties. In addition, activated carbons can be solution processed and thus provide an effective means for the manufacture of supercapacitors using standard industrial processes from slurry preparation, coating and drying, calendaring, slitting, welding, electrolyte filling, and packaging. Here, we discovered that laser irradiation of the carbon-coated electrodes results in the formation of microscale trenches that provide better means for storing electrolyte for effective charging and discharging. Laser scribed activated carbon (LSAC) can also reduce the distance over which the ions will have to move during charge and discharge processes. As a result, laser scribed carbon electrodes demonstrate both higher capacitance and lower internal resistance. This method provides an effective strategy for the design and fabrication of high-energy carbon electrodes with only one simple additive to the electrode processing techniques that are currently utilized for the industrial production of supercapacitors.Another way for reducing the cost of carbon supercapacitors is to replace the expensive components in the current technology with inexpensive alternatives without compromising the The global supercapacitor market has been growing rapidly during the past decade. Today, virtually all commercial devices use activated carbon. In this work, it is shown that laser treatment of activated carbon electrodes results in the formation of microchannels that can connect the internal pores of activated carbon with the surrounding electrolyte. These microchannels serve as electrolyte reservoirs that in turn shorten the ion diffusion distance and enable better interaction between the electrode surfaces and electrolyte ions. The capacitance can be f...

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High speed remote laser cutting of electrodes for lithium-ion batteries: Anode

Cited by 62 publications

References 29 publications

Investigation of Laser Cutting Width of LiCoO2 Coated Aluminum for Lithium-Ion Batteries

Investigation of Laser Cutting Width of LiCoO2 Coated Aluminum for Lithium-Ion Batteries

Investigation of Physical Phenomena and Cutting Efficiency for Laser Cutting on Anode for Li-Ion Batteries

Next‐Generation Activated Carbon Supercapacitors: A Simple Step in Electrode Processing Leads to Remarkable Gains in Energy Density

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