User-Friendly Differential Voltage Analysis Freeware for the Analysis of Degradation Mechanisms in Li-Ion Batteries

被引：213

作者：

Dahn, Hannah M. ^{[1
]}

Smith, A. J. ^{[1
]}

Burns, J. C. ^{[1
]}

Stevens, D. A. ^{[1
]}

Dahn, J. R. ^{[1
]}

机构：

[1] Dalhousie Univ, Dept Phys & Atmospher Sci, Halifax, NS B3H 4R2, Canada

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2012年 / 159卷 / 09期

基金：

加拿大自然科学与工程研究理事会;

关键词：

HIGH-POWER; CELLS;

D O I：

10.1149/2.013209jes

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

070208 [无线电物理];

摘要：

A user-friendly differential voltage analysis software has been developed and is described here. High-precision reference potential-specific capacity data for Li/negative electrode and Li/positive electrodes, as well as the cycled full cell potential-specific capacity, must be supplied by the user. From these, the differential voltage versus capacity, dV/dQ vs. Q, of a full Li-ion cell is calculated and compared to experiment. The calculated dV/dQ vs. Q curve has four adjustable parameters which are optimized manually with slider bars or automatically by least squares fitting of the calculation to experiment. The parameters are the positive electrode mass, the negative electrode mass, the positive electrode slippage and the negative electrode slippage. Examples of the use of the program are given for graphite/LiCoO2 wound cells cycled for hundreds of cycles. The variation of the four parameters with cycle number give insights into the mechanisms of cell failure equivalent to that which could be obtained with a Li reference electrode inserted within the cell. The software is available free of charge by contacting the authors. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.013209jes] All rights reserved.

引用

页码：A1405 / A1409

页数：5

共 6 条

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