Measurement of Parasitic Reactions in Li Ion Cells by Electrochemical Calorimetry

被引：95

作者：

Krause, L. J. ^{[1
]}

Jensen, L. D. ^{[1
]}

Dahn, J. R. ^{[2
]}

机构：

[1] 3M Co, Corp Mat Res Lab, St Paul, MN 55144 USA

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

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2012年 / 159卷 / 07期

基金：

加拿大自然科学与工程研究理事会;

关键词：

HIGH-PRECISION COULOMETRY; COULOMBIC EFFICIENCY; BATTERIES; ELECTROLYTES; MECHANISMS; ADDITIVES; HEAT;

D O I：

10.1149/2.021207jes

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 method for measuring the energy produced from parasitic cell reactions in lithium ion cells by electrochemical calorimetry is described. Negative electrode symmetric cells were charged and discharged by high precision current sources in an isothermal heat flow calorimeter while the cell voltage was accurately measured. Two sources of graphite of different BET surface areas were investigated. Symmetric cells of Li4Ti5O12 and lithium/graphite half cells were also measured by this method. The measured parasitic energy was well correlated to the loss of active Li, or coulombic efficiency, confirming the source of the parasitic energy as the heat of reaction occurring between the lithiated electrodes and the electrolyte. The effect of electrode formulation was also explored. Electrochemical calorimetry of symmetric cells is an excellent method to study new material sets to determine which will lead to extended cell lifetime. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.021207jes] All rights reserved.

引用

收藏

页码：A937 / A943

页数：7

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