Effect of pressure on capacitor electrodes formed with oxide nanoparticles

D. Giaume; X. Petrissans; P. Barboux

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Effect of pressure on capacitor electrodes formed with oxide nanoparticles

机译：压力对由氧化物纳米粒子形成的电容器电极的影响

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The effect of compactness and pressure on the conductivity of supercapacitor electrodes and their resulting electrochemical properties is studied. Mixtures of cobalt oxides M_xCoO_2 (M = H or Na) with carbon and polymer additives are studied under pressures up to 20 MPa. A power function links the compactness and the resistivity of the powder formulations in this pressure range, coherent with powder rearrangement and grain packing. Although the cobalt oxide grains have a metallic character, the powders remain quite resistive because of weak connections between the grains. Carbon additives enhance the intergranular conductivity in dry formulations and the resistivity mainly depends on the carbon volume content Electrochemical measurements on a symmetric cell using formulated electrodes in a Na_2SO_4 electrolyte clearly show a large positive effect of the pressure on the electrochemical performances of the cell: After release of the pressure, the electrode retains a part of its optimum performance.

机译：研究了紧密度和压力对超级电容器电极的电导率及其产生的电化学性能的影响。在高达20 MPa的压力下研究了氧化钴M_xCoO_2（M = H或Na）与碳和聚合物添加剂的混合物。幂函数将粉末配方在该压力范围内的致密性和电阻率联系在一起，与粉末重排和颗粒堆积相关。尽管氧化钴晶粒具有金属特性，但由于晶粒之间的连接较弱，粉末仍具有很高的电阻性。碳添加剂可增强干配方中的晶间导电性，而电阻率主要取决于碳的体积含量。在对称电池上使用Na_2SO_4电解质中的配制电极进行电化学测量，清楚地表明压力对电池的电化学性能有很大的积极影响：释放压力后，电极保留了其最佳性能的一部分。

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来源
《Journal of power sources》 |2014年第25期|100-106|共7页
作者
D. Giaume; X. Petrissans; P. Barboux;
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作者单位

Institut de Recherche de Chimie Paris, CNRS - Chimie ParisTech, 11 rue Pierre et Marie Curie, 75005 Paris, France, CNRS, FR 3459, Reseau Stockage Electrique de l'Energie RS2E, France;

Institut de Recherche de Chimie Paris, CNRS - Chimie ParisTech, 11 rue Pierre et Marie Curie, 75005 Paris, France, CNRS, FR 3459, Reseau Stockage Electrique de l'Energie RS2E, France;

Institut de Recherche de Chimie Paris, CNRS - Chimie ParisTech, 11 rue Pierre et Marie Curie, 75005 Paris, France, CNRS, FR 3459, Reseau Stockage Electrique de l'Energie RS2E, France;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种 eng
中图分类
关键词
Supercapacitor; Pressure; Composite electrode; Electronic conductivity; Impedance spectroscopy; Electrochemical properties;

机译：超级电容器压力;复合电极电子电导率;阻抗谱;电化学性质;

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Effect of pressure on capacitor electrodes formed with oxide nanoparticles

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