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Three-dimensionalization via control of laser-structuring parameters for high energy and high power lithium-ion battery under various operating con ditions

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Journal of Energy Chemistry 2022年第1期31卷 93-102,I0004页

作者： Junsu Park Hyeongi Song Inseok Jang Jaepil Lee jeongwook Um Seong-guk Bae Jihun Kim sungho jeong Hyeong-Jin Kim Ground Technology Research Insutitute Agency for Defense Development.P.O.Box 35Yuseong-guDaejeon 34186Republic of Korea Graduate School of Energy Convergence Gwangju Institute of Science and Technology123 Cheomdangwagi-ro.Buk-guGwangju 61005Republic of Korea School of Mechanical Engineering Gwangju Institute of Science and Technology123 Cheomdangwagi-ro.Buk-gu.Gwangju 61005Republic of Korea

Laser-structuring is an effective method to promote ion diffusion and improve the performance of lithium-ion battery(LIB)*** this work,the effects of laser structuring parameters(groove pitch and depth)on the fundamental characteristics of LIB electrode,such as interfacial area,internal resistances,material loss and electrochemical performance,are investigated,LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2) cathodes were structured by a femtosecond laser by varying groove depth and pitch,which resulted in a material loss of 5%-14%and an increase of 140%-260%in the in terfacial area between electrode surface and *** is shown that the importance of groove depth and pitch on the electrochemical performance(specific capacity and areal discharge capacity)of laser-structured electrode varies with current *** pitch is more im porta nt at low current rate but groove depth is at high curre nt *** the mapping of lithium concentration within the electrodes of varying groove depth and pitch by laser-induced breakdown spectroscopy,it is verified that the groove functions as a diffusion path for lithium *** ionic,electronic,and charge transfer resistances measured with symmetric and half cells showed that these internal resistances are differently affected by laser structuring parameters and the changes in porosity,ionic diffusion and electronic *** is demonstrated that the laser structuring parameters for maximum electrode performance and minimum capacity loss should be determined in consideration of the main operating conditions of LIBs.

关键词： Lithium-ion battery Laser structuring Energy density Power density Laser induced breakdown spectroscopy Lithium-ion diffusion

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Improvement in classification accuracy of stainless steel alloys by laser-induced breakdown spectroscopy based on elemental intensity ratio analysis

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Plasma Science and Technology 2020年第7期22卷 83-91页

作者： sungho SHIN Youngmin MOON Jaepil LE Eunsung KWON Kyihwan PARK sungho jeong School of Mechanical Engineering Gwangju Institute of Science and Technology1 Oryong-dong Buk-gu Gwangju 500-712Republic of Korea Engineering Solution Research Group Research Institute of Industrial Science and Technology67 Cheongam-ro Nam-gu Pohang-si Gyeongsangbuk-doRepublic of Korea

Laser-induced breakdown spectroscopy(LIBS) is a useful technique for accurate sorting of metal scrap by chemical composition *** this work,a method for intensity-ratiobased LIBS classification of stainless steel applicable to highly fluctuating LIBS signal conditions is *** spectral line pairs for intensity ratio calculation are selected according to elemental concentration and upper levels of emission *** is demonstrated that the classification accuracy can be significantly improved from that of full-spectra principal component analysis or intensity-based *** proposed method is considered to be suited to an industrial scrap sorting system that requires minimal maintenance and low system price.

关键词： laser-induced breakdown spectroscopy(LIBS) stainless steel classification intensity ratio

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Way-out for laser-induced breakdown spectroscopy

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Plasma Science and Technology 2020年第7期22卷 1-3页

作者：侯宗余 sungho jeong 出口祥啓王哲 State Key Lab of Power Systems International Joint Laboratory on Low Carbon Clean Energy InnovationDepartment of Energy and Power EngineeringTsinghua UniversityBeijing 100084People’s Republic o f China School of Mechanical Engineering Gwangju Institute of Science and TechnologyGwangju 61005Republic of Korea Graduate School of Technology Industrial and Social SciencesTokushima UniversityTokushima 770-8501Japan

Ever since its creation in 1963 [1], laser-induced breakdown spectroscopy(LIBS)has gained considerable attention due to its unique capability for real-time, in situ or online analysis [2, 3]. The future world is headi... 详细信息

关键词： breakdown laser spectroscopy

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Weighted-averaging-based classification of laser-induced breakdown spectroscopy measurements using most informative spectral lines

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Plasma Science and Technology 2020年第1期22卷 58-73页

作者： Ekta SRIVASTAVA Hyemin JANG sungho SHIN Janghee CHOI sungho jeong Euiseok HWANG School of Mechanical Engineering Gwangju Institute of Science and Technology(GIST)123 Cheomdangwagi-roBuk-guGwangju 61005Republic of Korea LGCNS LG Sciencepark El371Magokjungang 8-roGangseo-guSeoul 07795Republic of Korea Smart Manufacturing Technology Group Korea Institute of Industrial Technology89 Yangdaegiro-gilSeobuk-guCheonan-siChungcheongnam-do 31056Republic of Korea

In this study,efficient spectral line selection and wcightcd-avcraging-bascd processing schemes are proposed for the classification of laser-induced breakdown spectroscopy(UBS)*** fast on-line classification,a set of representative spectral lines arc selected ami processed relying on the information metric,instead of the time consuming full spectrum based analysis.I he most informative spectral line sets arc investigated by the joint mutual information estimation(MIR)evaluated with the Gaussian kernel density,where dominant intensity peaks associated with the concentrated components arc not necessarily most valuable for *** order to further distinguish the characteristic patterns of die LIBS measured spectrum,two-dimensional spectral images are synthesized through column-wise concatenation of the peaks along with their *** fast classification while preserv ing die effect of distinctive peak patterns,column-wise Gaussian weighted averaging is applied to die synthesized images,yielding a favorable trade off between classification performance and computational *** explore the applicability of the proposed schemes,two applications of alloy classification and skin cancer detection arc investigated with the multi-class and binary support vector machines classifiers,*** MIE measures associated with selected spectral lines in bodi applications show a strong correlation to the actual classification or detection accuracy,which enables to find out meaningful combinations of spectral *** addition,the peak patterns of the selected lines and their Gaussian weighted averaging with nciehbors of the selected peaks efficiently distineuish different classes of LIBS measured spectrum.

关键词： laser-induced breakdown spectroscopy mutual information weighted averaging alloy classification skin cancer detection

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Signal processing for real-time identification of similar metals by laser-induced breakdown spectroscopy

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Plasma Science and Technology 2019年第3期21卷 84-91页

作者： sungho SHIN Youngmin MOON Jaepil LEE Hyemin JANG Euiseok HWANG sungho jeong School of Mechanical Engineering Gwangju Institute of Science and Technology

Laser-induced breakdown spectroscopy(LIBS) is regarded as a promising technique for realtime sorting of scrap metals due to its capability of fast multi-elemental and in-air analysis. This work reports a method for signal processing which ensures high accuracy and high speed during similar metal sorting by LIBS. Similar metals such as aluminum alloys or stainless steel are characterized by nearly the same constituent elements with slight variations in elemental concentration depending on metal type. In the proposed method, the original data matrix is substantially reduced for fast processing by selecting new input variables(spectral lines) using the information for the constituent elements of similar metals. Specifically, principal component analysis(PCA) of full-spectra LIBS data was performed and then, based on the loading plots, the input variables of greater significance were selected in the order of higher weights for each constituent element. The results for the classification test with aluminum alloy, copper alloy,stainless steel and cast steel showed that the classification accuracy of the proposed method was nearly the same as that of full-spectra PCA, but the computation time was reduced by a factor of 20 or more. The results demonstrated that incorporating the information for constituent elements can significantly accelerate classification speed without loss of accuracy.

关键词： laser-induced breakdown spectroscopy classification similar metal reduced number of spectral lines

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Consistency of intensity ratio between spectral lines with similar self-absorption characteristics during ungated laser induced breakdown spectroscopy measurements

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Plasma Science and Technology 2019年第3期21卷 77-83页

作者： Jung-Hwan IN Youngmin MOON Jang-Hee CHOI sungho jeong Optical Lens Research Center Korea Photonics Technology Institute School of Mechanical Engineering Gwangju Institute of Science and Technology

This work reports that the intensity ratio of spectral lines having similar self-absorption characteristics during laser induced breakdown spectroscopy(LIBS) analysis can become nearly constant over a wide range of irradiation conditions if the intensities are integrated over a sufficiently long time. It is shown that the plasma temperature and intensity ratio of these spectral lines have temporal similarity. The spectral lines with similar self-absorption properties may be selected to improve the accuracy and consistency of LIBS analysis results under an environment with fluctuating measurement conditions.

关键词： laser induced breakdown spectroscopy intensity ratio self-absorption characteristics CIGS solar cell

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Real-time electrical detection of epidermal skin MoS2 biosensor for point-of-care diagnostics

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Nano Research 2017年第3期10卷 767-775页

作者： Geonwook Yoo Heekyeong Park Minjung Kim Won Geun Song Seokhwan jeong Min Hyung Kim Hyungbeen Lee Sang Woo Lee Young KiHong Min Goo Lee sungho Lee Sunkook Kim School of Electronic Engineering Soongsil University Seou106978 Republic of Korea Multi-Functional Nano/Bio Electronics Lab. Kyung Hee University Gyeonggi 17104 Republic of Korea Department of Biomedical Engineering Yonsei University Wonju 26493 Republic of Korea Korea Electronics Technology Institute Gyeonggi 13488 Republic of Korea

Various approaches have been proposed for point-of-care diagnostics, and in particular, optical detection is preferred because it is relatively simple and fast. At the same time, field-effect transistor （FET）-based biosensors have attracted great attention because they can provide highly sensitive and label-free detection. In this work we present highly sensitive, epidermal skin-type point-of-care devices with system-level integration of flexible MOS2 FET biosensors, read-out circuits, and light-emitting diode （LEDs） that enable real-time detection of prostate cancer antigens （PSA）. Regardless of the physical forms or mechanical stress conditions, our proposed high-performance MoS2 biosensors can detect a PSA concentration of 1 ***-1 without specific surface treatment for anti-PSA immobilization on the MoS2 surface on which we characterize and confirm physisorption of anti-PSA using Kelvin probe force microscopy （KPFM） and tapping-mode atomic force microscopy （tm-AFM）. Furthermore, current modulation induced by the binding process was stably maintained for longer than 2-3 min. The results indicate that flexible MoS2-based FET biosensors have great potential for point-of-care diagnostics for prostate cancer as well as other biomarkers.

关键词： epidermal skin biomarker MoS2 biosensor real-time point-of-care diagnostics

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Erratum to： Real-time electrical detection of epidermal skin MoS2 biosensor for point-of-care diagnostics

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Nano Research 2017年第3期10卷 I0002-I0002页

作者： Geonwook Yoo Heekyeong Park Minjung Kim Won Geun Song Seokhwan jeong Min Hyung Kim Hyungbeen Lee Sang Woo Lee Young Ki Hong Min Goo Lee sungho Lee Sunkook Kim School of Electronic Engineering Soongsil University Seou106978 Republic of Korea School of Advanced Materials Science & Engineering Sungkyunkwan University Suwon 16419 Republic of Korea Department of Biomedical Engineering Yonsei University Wonju 26493 Republic of Korea Korea Electronics Technology Institute Gyeonggi 13488 Republic of Korea

The second affiliation of the authors in the original version of this article was unfortunately wrongly written on the first page, instead of Multi-Functional Nano/Bio Electronics Lab., Kyung Hee University, Gyeonggi ...

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