电化学
电极
电池(电)
材料科学
石墨
化学工程
骨料(复合)
衍射
分析化学(期刊)
复合材料
化学
物理
物理化学
色谱法
热力学
工程类
功率(物理)
光学
作者
Xingqin Wang,Yaqin Song,Hao Cui,Jianhong Liu,Hua Huo,Li Wang,Yunzhi Gao,Xiangming He
出处
期刊:Energy & environmental materials
日期:2023-02-19
卷期号:6 (5)
被引量:5
摘要
LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) | SiOx‐graphite (SiO‐Gr.) battery chemistry is of intensive attention because its achievable practical energy density is approaching impressively 300 Wh Kg −1 . However, it still suffers rapid capacity fades during repeated cycles, both chemical, electrochemical and mechanical irreversibility contribute. A comprehensive understanding behind the fading behavior of the cell chemistry is required before fully realize the benefits of this chemistry. Herein, the in‐situ thickness variation is introduced as a diagnostic technique and is performed on 5–55 Ah NCM811|SiO‐Gr cells. With the help of Li reference electrode and in‐situ X‐ray diffraction device, the correspondence between thickness variation and the electrode potential is carefully investigated. Firstly, the NCM811|SiO‐Gr cell is characterized with the maximum cell thickness at around 80% state‐of‐charge (SOC) in the discharge process, rather than at 100% SOC. Secondly, the electrochemical behaviors during rate charge/discharge are diagnosed, and a Li platting signal is resolved from thickness variation profile at 2C. This work confirms that the thickness monitoring is a nondestructive and informative complement to conventional diagnostic techniques for failure analysis of pouch cells.
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