JP2015032572A5

JP2015032572A5 -

Info

Publication number: JP2015032572A5
Application number: JP2013164010A
Authority: JP
Filing date: 2013-08-07
Publication date: 2016-09-29

Description

本発明の一実施形態にかかる電池の劣化分析方法が適用されるための正極極板および負極極板を含んだラミネート型リチウムイオン二次電池の概略構成を示す外観図および断面図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external view and a cross-sectional view illustrating a schematic configuration of a laminated lithium ion secondary battery including a positive electrode plate and a negative electrode plate to which a battery deterioration analysis method according to an embodiment of the present invention is applied. 図１に示す構成の電池を高温放置試験した際の放置期間と電池容量劣化率の関係を示す図である。It is a figure which shows the relationship between the leaving period at the time of carrying out the high temperature leaving test of the battery of the structure shown in FIG. 1, and a battery capacity deterioration rate. 図２に示す電池Ａについて高温放置試験前後の内部インピーダンス測定結果である。It is an internal impedance measurement result before and after a high temperature leaving test about the battery A shown in FIG. 本発明の一実施形態にかかる電池の劣化分析方法が適用される対称型電池の概略構成を示す図である。It is a figure which shows schematic structure of the symmetrical battery to which the deterioration analysis method of the battery concerning one Embodiment of this invention is applied. 図２に示す電池Ａについて高温放置試験前後の電池から負極極板を取り出し、図４に示すコイン型対称型電池を組立てて内部インピーダンスを測定した結果である。FIG. 5 is a result of taking out the negative electrode plate from the battery before and after the high temperature storage test for the battery A shown in FIG. 2 and assembling the coin-type symmetrical battery shown in FIG. 4 and measuring the internal impedance. 図２に示す高温放置試験による電池容量劣化率と図５に示す物質移動抵抗の増加量の関係を示す図である。It is a figure which shows the relationship between the battery capacity deterioration rate by the high temperature leaving test shown in FIG. 2, and the increase amount of the mass transfer resistance shown in FIG.

１．ラミネート型電池の構成
図１は、本発明の一実施形態にかかる電池の劣化分析方法が適用されるための正極極板１（正極集電体７と正極活物質層８とからなる）および負極極板２（負極集電体９と負極活物質層１０とからなる）を含んだラミネート型リチウムイオン二次電池の概略構成を示す図であり正極極板１および負極極板２はセパレータ３を介して積層体を形成し、リチウム塩を含んだ非水溶媒電解液とともにラミネートフィルム４からなる外装材に収納されている。正極端子５は正極集電体７と、また負極端子６は負極集電体９とそれぞれラミネートフィルム４の内部で電気的に接続されている。また、積層体は正極極板および負極極板が一枚ずつであるいわゆる単層型であってもよく、前記極板が複数枚ずつのいわゆる積層型であってもよい。 1. Configuration of Laminated Battery FIG. 1 shows a positive electrode plate 1 (consisting of a positive electrode current collector 7 and a positive electrode active material layer 8) and a negative electrode for applying a battery deterioration analysis method according to an embodiment of the present invention. FIG. 2 is a diagram showing a schematic configuration of a laminated lithium ion secondary battery including an electrode plate 2 (consisting of a negative electrode current collector 9 and a negative electrode active material layer 10) . A laminated body is formed, and is housed in an exterior material made of a laminate film 4 together with a non-aqueous solvent electrolyte containing a lithium salt. The positive electrode terminal 5 is electrically connected to the positive electrode current collector 7, and the negative electrode terminal 6 is electrically connected to the negative electrode current collector 9 inside the laminate film 4. The laminated body may be a so-called single layer type in which one positive electrode plate and one negative electrode plate are provided, or may be a so-called laminated type in which a plurality of the electrode plates are provided.

Claims

Taking out either the positive electrode plate or the negative electrode plate from the lithium ion secondary battery, producing a symmetrical battery using the extracted electrode plate , and measuring the internal impedance, the charge of the extracted electrode plate A battery deterioration analysis method for calculating a sum of a transfer resistance and a mass transfer resistance.

The battery degradation analysis method according to claim 1, wherein the symmetrical battery is subjected to a standing test at a predetermined temperature, and an amount of increase in mass transfer resistance of the extracted electrode plate before and after the standing test is calculated .

The battery degradation analysis method according to claim 1 or 2 , wherein the internal impedance is measured at a temperature of -10 to 10 ° C.

The battery degradation analysis method according to claim 1, wherein a frequency range for measuring the internal impedance is in a range of 500 kHz to 1 mHz.