Calendar and cycle life study of Li(NiMnCo)O2-based 18650 lithiumion batteries
Calendar and cycle life study of Li(NiMnCo)O2-based 18650 lithiumion batteries
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DOI：
10.1016/j.jpowsour.2013.09.143
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发表时间：
2014-02-15
影响因子：
9.2
通讯作者：
Sauer, Dirk Uwe
中科院分区：
文献类型：
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作者：
Ecker, Madeleine;Nieto, Nerea;Sauer, Dirk Uwe
采用锂离子高能18650系统（2.05 Ah），负极：碳，正极：Li（NiMnCo）O-2）进行了一系列广泛的加速老化试验。它由Sanyo制造，标记为UR 18650 E，是一种商业现货产品。测试包括在不同环境温度和恒定电池电压下的日历寿命测试以及使用标准测试曲线在几个电压范围和水平内操作电池的循环寿命测试。总共测试了73个电池。日历寿命测试矩阵特别详细地研究了SOC对老化的影响，而循环寿命矩阵则侧重于详细分析循环深度的影响。研究表明，碳电极的分级行为对循环寿命有显著影响。此外，已经检测到碳势对日历老化的强烈影响。老化和不同的影响因素之间的关系，以及可能的降解机制进行了讨论。C/4放电电压曲线分析表明，与日历老化相比，循环老化会导致不同的老化过程和材料性能变化。循环，特别是循环跨越碳电极的电压平台之间的转变，似乎会破坏碳结构。(C)2013 Elsevier B. V.保留所有权利。
An extensive set of accelerated aging tests has been carried out employing a Li-ion high energy 18650 system (2.05 Ah), negative electrode: carbon, positive electrode: Li(NiMnCo)O-2). It is manufactured by Sanyo, labeled UR18650E, and is a commercial off-the-shelf product. The tests comprise both calendar life tests at different ambient temperatures and constant cell voltages and cycle life tests operating the cells within several voltage ranges and levels using standard test profiles. In total, 73 cells have been tested. The calendar life test matrix especially investigates the influence of SOC on aging in detail, whereas the cycle life matrix focuses on a detailed analysis of the influence of cycle depth. The study shows significant impact of the staging behavior of the carbon electrode on cycle life. Furthermore a strong influence of the carbon potential on calendar aging has been detected. Observed relations between aging and the different influence factors as well as possible degradation mechanisms are discussed. Analysis of C/4 discharge voltage curves suggests that cycle aging results in different aging processes and changes in material properties compared to calendar aging. Cycling, especially with cycles crossing transitions between voltage plateaus of the carbon electrode seems to destroy the carbon structure. (C) 2013 Elsevier B.V. All rights reserved.