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| 1 | Critical role of corrosion inhibitors modified by silyl ether functional groups on electrochemical performances of lithium manganese oxides显示文摘Lithium manganese oxides(Li Mn2 O4, LMO) have attracted significant attention as important cathode materials for lithium-ion batteries(LIBs), which require fast charging based on their intrinsic electrochemical properties. However, these properties are limited by the rapid fading of cycling retention, particularly at high temperatures, because of the severe Mn corrosion triggered by the chemical reaction with fluoride(F-) species existing in the cell. To alleviate this issue, three types of silyl ether(Si–O)-functionalized task-specific additives are proposed, namely methoxytrimethylsilane, dimethoxydimethylsilane, and trimethoxymethylsilane. Ex-situ NMR analyses demonstrated that the Si-additives selectively scavenged the F-species as Si forms new chemical bonds with F via a nucleophilic substitution reaction due to the high binding affinity of Si with F-, thereby leading to a decrease in the F concentration in the cell. Furthermore, the addition of Si-additives in the electrolyte did not significantly affect the ionic conductivity or electrochemical stability of the electrolyte, indicating that these additives are compatible with conventional electrolytes. In addition, the cells cycled with Si-additives exhibited improved cycling retention at room temperature and 45 °C. Among these candidates, a combination of MTSi and the LMO cathode was found to be the most suitable choice in terms of cycling retention(71.0%), whereas the cell cycled with the standard electrolyte suffered from the fading of cycling retention triggered by Mn dissolution(64.4%). Additional ex-situ analyses of the cycled electrodes using SEM, TEM, EIS, XPS, and ICP-MS demonstrated that the use of Si-additives not only improved the surface stability of the LMO cathode but also that of the graphite anode, as the Si-additives prevent Mn corrosion. This inhibits the formation of cracks on the surface of the LMO cathode, facilitating the formation of a stable solid electrolyte interphase layer on the surface of the graphite anode. Therefore, Si-additives modified by Si–O functional groups can be effectively used to increase the overall electrochemical performance of the LMO cathode material. | Min Ji Seong Taeeun Yim | 2020 | Journal of Energy Chemistry2020，29，12： | 3 |
| 2 | Calcium-and sulfate-functionalized artificial cathode–electrolyte interphases of Ni-rich cathode materials显示文摘Ni-rich lithium nickel–cobalt-manganese oxides(NCM) are considered the most promising cathode materials for lithium-ion batteries(LIBs);however, relatively poor cycling performance is a bottleneck preventing their widespread use in energy systems. In this work, we propose the use of a dually functionalized surface modifier, calcium sulfate(CaSO_(4), CSO), in an efficient one step method to increase the cycling performance of Ni-rich NCM cathode materials. Thermal treatment of LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811) cathode materials with a CSO precursor allows the formation of an artificial Ca-and SO_(x)-functionalized cathode–electrolyte interphase(CEI) layer on the surface of Ni-rich NCM cathode materials. The CEI layer then inhibits electrolyte decomposition at the interface between the Ni-rich NCM cathode and the electrolyte. Successful formation of the CSO-modified CEI layer is confirmed by scanning electron microscopy(SEM) and Fourier transform infrared(FTIR) spectroscopy analyses, and the process does not affect the bulk structure of the Ni-rich NCM cathode material. During cycling, the CSO-modified CEI layer remarkably decreases electrolyte decomposition upon cycling at both room temperature and 45 ℃, leading to a substantial increase in cycling retention of the cells. A cell cycled with a 0.1 CSO-modified(modified with 0.1% CSO)NCM811 cathode exhibits a specific capacity retention of90.0%, while the cell cycled with non-modified NCM811 cathode suffers from continuous fading of cycling retention(74.0%) after 100 cycles. SEM, electrochemical impedance spectroscopy(EIS), X-ray photoelectron spectroscopy(XPS), and inductively coupled plasma mass spectrometry(ICP-MS) results of the recovered electrodes demonstrate that undesired surface reactions such as electrolyte decomposition and metal dissolution are well controlled in the cell because of the artificial CSO-modified CEI layer present on the surface of Ni-rich NCM811 cathodes. | Kwangeun Jung Taeeun Yim | 2021 | Rare Metals2021，40，10： | 2 |
| 3 | Effect of binder properties on electrochemical performance for silicon-graphite anode: Method and application of binder screening显示文摘 | Taeeun Yim Soo Jung Choi Yong Nam Jo Tae-Hyun Kim Ki Jae Kim Goojin Jeong Young-Jun Kim | 2014 | Electrochimica Acta2014，，： | 1 |
| 4 | Electron-beam-irradiated polyethylene membrane with improved electrochemical and thermal properties for lithium-ion batteries显示文摘 | Ki Jae Kim Min-Sik Park Taeeun Yim Ji-Sang Yu Young-Jun Kim | 2014 | Journal of Applied Electrochemistry2014，，3： | 1 |
| 5 | Effect of chemical reactivity of polysulfide toward carbonate-based electrolyte on the electrochemical performance of Li–S batteries显示文摘 | Taeeun Yim Min-Sik Park Ji-Sang Yu Ki Jae Kim Keun Yung Im Jae-Hun Kim Goojin Jeong Yong Nam Jo Sang-Gil Woo Kyoung Seok Kang Ingurl Lee Young-Jun Kim | 2013 | Electrochimica Acta2013，，： | 1 |
| 6 | Synthesis and properties of acyclie ammonium-based ionic liquids with allyl substituents as electrolytes显示文摘 | Taeeun Y Chang Y C Junyoung M | 2009 | Molecules2009，14，： | 1 |
| 7 | Dually-functionalized Ni-rich layered oxides for high-capacity lithium-ion batteries显示文摘Layered lithium nickel-cobalt-manganese oxides(NCM)have been highlighted as advanced cathode materials for lithium-ion batteries(LIBs);however,their low interfacial stability must be overcome to ensure stable cycling performance of the cell.In this work,we propose a one-step surface modification method that uses a task-specific precursor,N,N,N,N-tetraethylsulfamide(NTESA),to improve interfacial stability of Ni-rich NCM cathode materials.The unstable surface properties of Ni-rich NCM cathode material are improved by embedding an artificial cathode-electrolyte interphase(CEI)layer on the cathode surface by heat treatment of the Ni-rich NCM cathode material with an NTESA precursor at low temperature.Our material analyses indicate that this approach allows the formation of amine-and sulfone-functionalized CEI layers on the surface of Ni-rich NCM cathode material without changing the layered structure of the cathode material.NTESA-functionalized Ni-rich NCM cathode materials exhibit improved cycling retention after 100 cycles:for example,a cell cycled with a 3.0 NTESA-modified NCM811 cathode presents the highest retention ratio of 88.3%,whereas a cell cycled with a non-functionalized NCM811 cathode suffers from rapid fading of the cycling performance(68.4%).Our additional SEM,XPS,and EIS analyses indicate that electrolyte decomposition is suppressed during electrochemical cycling,thereby leading to smaller increases in the internal resistances.ICP-MS analyses of the cycled anodes also indicate that the NTESA-based artificial CEI layer inhibits the dissolution of transition metal components from the Ni-rich NCM cathode materials,thereby contributing to an improved overall electrochemical performance of the cell. | Ji Won Kim Kwangeun Jung Taeeun Yim | 2021 | Journal of Materials Science & Technology2021，，27： | 0 |
| 8 | CO_(2)-adsorbent spongy electrode for non-aqueous Li–O_(2) batteries显示文摘Regulation of the Li_(2)CO_(3) byproduct is the most critical challenge in the field of non-aqueous Li–O_(2) batteries.Although considerable efforts have been devoted to preventing Li_(2)CO_(3) formation,no approaches have suggested the ultimate solution of utilizing the clean Li_(2)O_(2) reaction instead of that of Li_(2)CO_(3).Even if extremely pure O_(2) is used in a Li–O_(2) cell,its complete elimination is impossible,eventually generating CO_(2) gas during charge.In this paper,we present the new concept of a CO_(2)-adsorbent spongy electrode(CASE),which is designed to trap the evolved CO_(2) using adsorption materials.Various candidates composed of amine functional groups(–NH2)for capturing CO_(2) were screened,with quadrapurebenzylamine(QPBZA)exhibiting superior CO_(2)-adsorbing ability among the proposed candidates.Accordingly,we fabricated the CASE by sandwiching QPBZA between porous carbon layers,which facilitated the transport of gaseous products.The new electrode was demonstrated to effectively capture the evolved CO_(2) during charge,therefore altering the reaction pathways to the ideal case.It is highly advantageous to mitigate the undesirable CO_(2) incorporation in the next discharge,resulting in improved cyclability.This novel concept of a CO_(2)-sponging electrode provides an alternative route to the realization of practically meaningful Li–O_(2) batteries. | Yiseul Yoo Giseung Lee Min-Gi Jeong Hun-Gi Jung Sunghee Shin Dongjin Byun Taeeun Yim Hee-Dae Lim | 2022 | Journal of Energy Chemistry2022，31，2： | 0 |
| 9 | 基于rs-fMRI探讨杨氏絮刺火罐对湿疹瘙痒的影响显示文摘目的:采用静息态功能磁共振成像(rs-f MRI)技术探究杨氏絮刺火罐治疗湿疹瘙痒的临床疗效和中枢机制。方法:50例湿疹瘙痒患者纳入观察组,50名健康受试者纳入对照组。对照组不行任何干预;观察组于大椎及双侧曲池、血海、三阴交行杨氏絮刺火罐治疗,每周1次,共治疗6周。比较观察组治疗前后12项瘙痒严重程度评估量表(12-PSS)、湿疹面积及严重程度(EASI)、皮肤病生活质量指数(DLQI)、匹兹堡睡眠质量指数(PSQI)和焦虑自评量表(SAS)评分。观察组治疗前后及对照组入组时均接受rs-fMRI扫描并进行局部一致性(ReHo)分析,将差异脑区ReHo值与上述量表评分进行相关性分析。结果:与治疗前比较,观察组治疗后12-PSS、EASI、DLQI、PSQI、SAS评分均降低(P<0.01,P<0.05)。与对照组比较,观察组治疗前右侧尾状核、右侧颞中回、右侧眶部额上回、右侧丘脑、左侧角回ReHo值增高(P<0.001);与治疗前比较,观察组治疗后上述脑区ReHo值下降(P<0.001)。与对照组比较,观察组治疗前左侧颞中回、左侧顶上小叶、左侧补充运动区ReHo值下降(P<0.001);与治疗前比较,观察组治疗后上述脑区ReHo值增高(P<0.001)。治疗前,观察组左侧补充运动区ReHo值与12-PSS评分呈正相关(r=0.432,P=0.004);右侧眶部额上回ReHo值与PSQI评分呈负相关(r=-0.318, P=0.04)。治疗后,观察组左侧顶上小叶ReHo值与12-PSS评分呈正相关(r=0.384,P=0.012)。结论:湿疹瘙痒患者多个参与刺激反应、情绪调节、行为控制、注意力等功能的脑区存在活动异常。杨氏絮刺火罐能有效改善湿疹患者瘙痒症状和皮肤损害,其作用机制可能和逆转瘙痒所导致的脑区功能活动异常有关。 | 魏翔宇 于立新 Taeeun Kim Larissa Tao 沈嫱 徐慧慧 王辉 沈卫东 | 2024 | 中国针灸2024，44，1： | 0 |
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