期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 28, 页码 33075-33082出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c07932
关键词
lithium-ion battery; NCM811; online dissolution monitoring; transition-metal dissolution; ICP-MS; flow cell
The dissolution and deposition of transition metals from cathode materials impede the increase of cell voltage in lithium-ion batteries, contributing to capacity loss. By coupling an electroanalytical flow cell with inductively coupled plasma mass spectrometry, this study successfully demonstrated a fast performance assessment of new cathode materials and provided insights into the underlying mechanisms of the processes.
The dissolution of transition metals (TMs) from cathode materials and their deposition on the anode represents a serious degradation process and, with that, a shortcoming of lithium-ion batteries. It occurs particularly at high charge voltages (>4.3 V), contributing to severe capacity loss and thus impeding the increase of cell voltage as a simple measure to increase energy density. We present here for the first time the online detection of dissolved TMs from a Ni-rich layered oxide cathode material with unprecedented potential and time resolution in potentiodynamic scans. To this aid, we used the coupling of an electroanalytical flow cell (EFC) with inductively coupled plasma mass spectrometry (ICP-MS), which is demonstrated to be an ideal tool for a fast performance assessment of new cathode materials from initial cycles. The simultaneous analysis of electrochemical and dissolution data allows hitherto hidden insights into the processes' characteristics and underlying mechanisms.
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