溶解
阴极
阳极
材料科学
电解质
降级(电信)
电感耦合等离子体质谱法
过渡金属
金属
化学工程
感应耦合等离子体
下降(电信)
离子
分析化学(期刊)
化学物理
等离子体
质谱法
电极
冶金
化学
环境化学
物理化学
色谱法
工程类
物理
催化作用
电信
有机化学
量子力学
生物化学
计算机科学
作者
Egy Adhitama,Feleke Demelash,Tobias Brake,Anindityo Arifiadi,Marc Vahnstiege,Atif Javed,Martin Winter,Simon Wiemers‐Meyer,Tobias Placke
标识
DOI:10.1002/aenm.202303468
摘要
Abstract Combining LiNi x Co y Mn 1−x−y O 2 (NCM) as cathode with bare Cu as anode will potentially lead to next‐generation batteries that are smaller, lighter, and can run for longer periods on a single charge. However, maintaining high performance and a long lifespan of NCM || Cu cells is challenging as it can be affected by various factors from both the cathode and the anode. From the cathode, it is well‐known that transition metal (TM) dissolution accelerates cell degradation. From the anode, one of the main challenges is the formation of high surface area Li deposits which later transform into “inactive Li” or “dead Li”. In this study, a comprehensive assessment regarding these competing factors (i.e., TM deposits and “dead Li”) is discussed. Accelerated TM dissolution is accomplished by introducing TM‐containing additives into the electrolyte. The effects of these competing factors and their degradation mechanism are studied quantitatively and qualitatively through inductively coupled plasma, i.e., optical emission spectroscopy and mass spectrometry. The “dead Li” influence is analyzed quantitatively using gas chromatography. The results demonstrate the obvious deleterious impact of dissolved TM ions on cell performance. At the same time, “dead Li” has also become a notable factor for a sudden capacity drop.
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