In situ high-energy X-ray diffraction to study overcharge abuse of 18650-size lithium-ion battery
In situ high-energy X-ray diffraction to study overcharge abuse of 18650-size lithium-ion battery
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DOI：
10.1016/j.jpowsour.2012.12.032
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发表时间：
2013-05-15
影响因子：
9.2
通讯作者：
Chen, Zonghai
中科院分区：
文献类型：
--
作者：
Lin, Chi-Kai;Ren, Yang;Chen, Zonghai
过度充电是一种严重的滥用情况，可能导致锂离子电池热失控。了解过度充电导致的失效机制对于设计更安全的锂离子化学物质至关重要。借助原位高能X射线衍射（XRD），我们能够检测18650电池在过度充电过程中阴极和阳极之间的温差。在本文中，通过拟合 XRD 图来计算电极集流体（阴极为 Al，阳极为 Cu）的晶格常数，并通过 Al 和 Cu 箔的热膨胀来量化阴极和阳极的温度变化。基于这些结果，我们发现，在使用石墨作为阳极、LiNi0.8Co0.15Al0.05O2作为阴极的18650尺寸电池的过度充电过程中，当电压达到4.16 V时，阴极温度升高，这对应于阴极材料中H2到H3相变的发生。 (C) 2012 Elsevier B.V. 保留所有权利。
Overcharge is an aggressive abuse condition that can lead to thermal runaway of a lithium-ion cell. Understanding the failure mechanism due to overcharge is critical for designing safer lithium-ion chemistries. With the help of in situ high-energy X-ray diffraction (XRD), we are able to detect the temperature difference between the cathode and the anode during the overcharge abuse of 18650 cells. In this paper, the lattice constants of electrode current collectors (Al for the cathode and Cu for the anode) are calculated by fitting the XRD patterns, and the temperature variations of the cathode and anode are quantified by the thermal expansion of the Al and Cu foils. Based on these results, we report that during the overcharge abuse of an 18650-size cell, using graphite as the anode and LiNi0.8Co0.15Al0.05O2 as the cathode, the temperature of cathode increases as the voltage reaches 4.16 V, corresponding to the occurrence of the H2-to-H3 phase transition in the cathode material. (C) 2012 Elsevier B.V. All rights reserved.