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首页> 外文期刊>Chemical Engineering Science >A sandwich-structured double-battery device for direct evaluation of lithium diffusion coefficients and phase transition in electrodes of lithium ion batteries
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A sandwich-structured double-battery device for direct evaluation of lithium diffusion coefficients and phase transition in electrodes of lithium ion batteries

机译：用于直接评估锂离子电池电极电极锂扩散系数和相变的三明治结构的双电池装置

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摘要

Li diffusion efficiency reflects the kinetics of Li intercalation/de-intercalation in solid electrode materials and determines the rate performances of Li ion batteries. Traditional techniques including the electrochemical impedance spectroscopy, potential intermittent titration technique, potential relaxation technique, galvanostatic intermittent titration technique, and cyclic voltammetry, could lead to significant disagreement on Li chemical diffusion coefficients due to the limited reliability of the parameters required for calculating Li diffusion coefficients. Based on the Nernst-Einstein equation, a double-battery system is proposed for the direct measurement of chemical diffusion coefficients of Li in solid electrodes. With the double-battery system, Li diffusion coefficients in the intercalation/deintercalation of graphite electrodes featured with phase-transition and double-phase regions, are measured efficiently, with consistent values in the range of 10(-10)-10(-9) cm(2)/s. The direct measurement then allows for the evaluation of the diffusion barrier associated with Li intercalation/de-intercalation in the electrodes. (C) 2019 Elsevier Ltd. All rights reserved.
机译：LI扩散效率反映了固体材料中Li离子电池的Li Intercalation / De-intercalation的动力学，并确定Li离子电池的速率性能。包括电化学阻抗光谱，电位间歇性滴定技术，潜在的弛豫技术，电流间歇性间歇滴定技术和循环伏安法的传统技术可能导致Li化学扩散系数的显着分歧，因为计算LI扩散系数所需的参数的有限可靠性。基于NERNST-EINSTEI方程，提出了一种双电池系统，用于直接测量固体电极中LI的化学扩散系数。利用双电池系统，有效地测量了相位转移和双相电极的嵌入/脱嵌的LI扩散系数，有效地测量，在10（-10）-10（-9）的范围内具有一致的值）cm（2）/ s。然后，直接测量允许评估与电极中的Li插入/去嵌段相关的扩散屏障。 （c）2019年elestvier有限公司保留所有权利。

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  • 来源
    《Chemical Engineering Science》 |2019年第2019期|共7页
  • 作者

    Wen Kechun; Xia Mingfu; Deng Pan; Lv Weiqiang; He Weidong;

  • 作者单位

    Harbin Inst Technol Ctr Composite Mat &

    Struct Natl Key Lab Sci &

    Technol Adv Composites Special Harbin 150080 Heilongjiang Peoples R China;

    Harbin Inst Technol Ctr Composite Mat &

    Struct Natl Key Lab Sci &

    Technol Adv Composites Special Harbin 150080 Heilongjiang Peoples R China;

    Harbin Inst Technol Ctr Composite Mat &

    Struct Natl Key Lab Sci &

    Technol Adv Composites Special Harbin 150080 Heilongjiang Peoples R China;

    Harbin Inst Technol Ctr Composite Mat &

    Struct Natl Key Lab Sci &

    Technol Adv Composites Special Harbin 150080 Heilongjiang Peoples R China;

    Harbin Inst Technol Ctr Composite Mat &

    Struct Natl Key Lab Sci &

    Technol Adv Composites Special Harbin 150080 Heilongjiang Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学工业;
  • 关键词

    Li ion batteries; Diffusion coefficient; Double-battery device; Graphite electrode;

    机译：Li离子电池;扩散系数;双电池装置;石墨电极;

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