{"title":"Erratum: Excellent Rate Capability of MgO-Templated Mesoporous Carbon as an Na-Ion Energy Storage Material [ECS Electrochem. Lett., 4, A22 (2015)]","authors":"Y. Kado, Y. Soneda, N. Yoshizawa","doi":"10.1149/2.0041503EEL","DOIUrl":"https://doi.org/10.1149/2.0041503EEL","url":null,"abstract":"","PeriodicalId":11470,"journal":{"name":"ECS Electrochemistry Letters","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1149/2.0041503EEL","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64316154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aishuak Konarov, D. Gosselink, Yongguang Zhang, Ye Tian, Diana Askhatova, Pu Chen
Self-discharge refers to the loss in stored charge of a battery without connection between its electrodes as a consequence of internal chemical reactions. Self-discharge processes can be tested in a loadfree state for a fixed time. Two self-discharge reactions are possible in a Li-ion cell: one is chemical and the other electrochemical. Because of their reactivity, charged cells can undergo side reactions, and factors such as purity of the active material or electrolyte, the specific surface area of the electrodes, conductors, binders or separators can have effect on the self-discharge performance. These reactions are mostly irreversible while electrochemical reactions can be reversible. For example, lithium re-intercalation can lead to self-discharge of Li-ion batteries, as has been demonstrated by many researchers who have studied the different factors that could affect self-discharge of
{"title":"Self-Discharge of Rechargeable Hybrid Aqueous Battery","authors":"Aishuak Konarov, D. Gosselink, Yongguang Zhang, Ye Tian, Diana Askhatova, Pu Chen","doi":"10.1149/2.0111512EEL","DOIUrl":"https://doi.org/10.1149/2.0111512EEL","url":null,"abstract":"Self-discharge refers to the loss in stored charge of a battery without connection between its electrodes as a consequence of internal chemical reactions. Self-discharge processes can be tested in a loadfree state for a fixed time. Two self-discharge reactions are possible in a Li-ion cell: one is chemical and the other electrochemical. Because of their reactivity, charged cells can undergo side reactions, and factors such as purity of the active material or electrolyte, the specific surface area of the electrodes, conductors, binders or separators can have effect on the self-discharge performance. These reactions are mostly irreversible while electrochemical reactions can be reversible. For example, lithium re-intercalation can lead to self-discharge of Li-ion batteries, as has been demonstrated by many researchers who have studied the different factors that could affect self-discharge of","PeriodicalId":11470,"journal":{"name":"ECS Electrochemistry Letters","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1149/2.0111512EEL","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64344483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jonathan Højberg, Kristian B. Knudsen, J. Hjelm, T. Vegge
Reactions and SEI Formation during Charging of Li-O2 Cells In this letter we combine detailed electrochemical impedance measurements with quantitative measurements of O2 evolution and Li2O2 oxidation to describe the charge mechanisms during charge of Li-O2 batteries with porous carbon electrodes. We identify Li2O2 oxidation at 3.05 V and an apparent chemical formation of a solid electrolyte interface (SEI) layer as the first monolayer of Li2O2 is oxidized, leading to a voltage increase. The first electrochemical degradation reaction is identified between 3.3 V and 3.5 V, and the chemical degradation is limited above 3.5 V, suggesting that a chemically stable SEI layer has been formed.
在这篇文章中，我们将详细的电化学阻抗测量与O2演化和Li2O2氧化的定量测量相结合，描述了多孔碳电极Li-O2电池充电过程中的充电机制。我们发现Li2O2在3.05 V时氧化，并且随着第一层Li2O2被氧化，导致电压升高，固体电解质界面(SEI)层的明显化学形成。在3.3 V ~ 3.5 V之间发生了第一次电化学降解反应，在3.5 V以上发生的化学降解受到限制，表明已经形成了化学稳定的SEI层。
{"title":"Reactions and SEI Formation during Charging of Li-O2 Cells","authors":"Jonathan Højberg, Kristian B. Knudsen, J. Hjelm, T. Vegge","doi":"10.1149/2.0051507EEL","DOIUrl":"https://doi.org/10.1149/2.0051507EEL","url":null,"abstract":"Reactions and SEI Formation during Charging of Li-O2 Cells In this letter we combine detailed electrochemical impedance measurements with quantitative measurements of O2 evolution and Li2O2 oxidation to describe the charge mechanisms during charge of Li-O2 batteries with porous carbon electrodes. We identify Li2O2 oxidation at 3.05 V and an apparent chemical formation of a solid electrolyte interface (SEI) layer as the first monolayer of Li2O2 is oxidized, leading to a voltage increase. The first electrochemical degradation reaction is identified between 3.3 V and 3.5 V, and the chemical degradation is limited above 3.5 V, suggesting that a chemically stable SEI layer has been formed.","PeriodicalId":11470,"journal":{"name":"ECS Electrochemistry Letters","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1149/2.0051507EEL","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64320430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sanchit Khurana, Derek M. Hall, Rich S. Schatz, S. Lvov
A significance performance limitation for a CuCl(aq)/HCl(aq) electrolytic cell is the ohmic losses associated with the contact resistance. The contact resistance between the flow field channels of the end plate and the carbon cloth electrodes plays a significant part in ensuring good electrical connection. The contact resistance is heavily dependent on the clamping pressure, and despite the link between compressionandelectrochemicalperformance,therearenopublished results related to optimum amount of pressure needed to assemble a CuCl(aq)/HCl(aq) electrolytic cell. While insufficient clamping pressuremayresultinhighelectricalresistanceattheelectrodes/flow-field channel interface, a high clamping pressure could lead to mechanical deformation of the MEA and uneven pressure distribution. An excessive compression pressure also increases the mass transport problems with a reduction in cell performance at high current densities. 9,10 In this study, an optimum value of the compression pressure resulting from torque on the bolts that clamp the cell was observed to be 20 Nm. Also, this study highlights the increase in performance of a CuCl(aq)/HCl(aq) electrolyzer by increasing the temperature from 40 to 80 ◦ C.
{"title":"Effect of Clamping Pressure and Temperature on the Performance of a CuCl(aq)/HCl(aq) Electrolyzer","authors":"Sanchit Khurana, Derek M. Hall, Rich S. Schatz, S. Lvov","doi":"10.1149/2.0011504EEL","DOIUrl":"https://doi.org/10.1149/2.0011504EEL","url":null,"abstract":"A significance performance limitation for a CuCl(aq)/HCl(aq) electrolytic cell is the ohmic losses associated with the contact resistance. The contact resistance between the flow field channels of the end plate and the carbon cloth electrodes plays a significant part in ensuring good electrical connection. The contact resistance is heavily dependent on the clamping pressure, and despite the link between compressionandelectrochemicalperformance,therearenopublished results related to optimum amount of pressure needed to assemble a CuCl(aq)/HCl(aq) electrolytic cell. While insufficient clamping pressuremayresultinhighelectricalresistanceattheelectrodes/flow-field channel interface, a high clamping pressure could lead to mechanical deformation of the MEA and uneven pressure distribution. An excessive compression pressure also increases the mass transport problems with a reduction in cell performance at high current densities. 9,10 In this study, an optimum value of the compression pressure resulting from torque on the bolts that clamp the cell was observed to be 20 Nm. Also, this study highlights the increase in performance of a CuCl(aq)/HCl(aq) electrolyzer by increasing the temperature from 40 to 80 ◦ C.","PeriodicalId":11470,"journal":{"name":"ECS Electrochemistry Letters","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1149/2.0011504EEL","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64303338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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