Revealing the Intrinsic Uneven Electrochemical Reactions of Li Metal Anode in Ah‐Level Laminated Pouch Cells

Revealing the Intrinsic Uneven Electrochemical Reactions of Li Metal Anode in Ah‐Level Laminated Pouch Cells

Advanced Functional Materials

10.1002/adfm.202210669

http://dx.doi.org/10.1002/adfm.202210669

Xiangrui Duan, Lingyue Wang, Guocheng Li, Xueting Liu, Mintao Wan, Junmou Du, Renming Zhan, Wenyu Wang, Yuanjian Li, Shuibin Tu, Yue Shen, Zhi Wei Seh, Li Wang, Yongming Sun

Biomaterials, Electrochemistry, Electronic, Optical and Magnetic Materials, Condensed Matter Physics

28 November 2022

Duan, X., Wang, L., Li, G., Liu, X., Wan, M., Du, J., Zhan, R., Wang, W., Li, Y., Tu, S., Shen, Y., Seh, Z. W., Wang, L., & Sun, Y. (2022). Revealing the Intrinsic Uneven Electrochemical Reactions of Li Metal Anode in Ah‐Level Laminated Pouch Cells. Advanced Functional Materials, 33(6), 2210669. Portico. https://doi.org/10.1002/adfm.202210669

The uneven electrochemical reactions of lithium (Li) metal anode is one of the main reasons that hinder its application in rechargeable high energy density batteries. Great progress has been achieved in homogenizing electrochemical reactions of Li metal anode in lab-scale coin cells, however, it cannot be directly applied to pouch cells, where undesirable defects or side reactions are significantly aggravated. With carbonate electrolyte, multi-layered negative and positive electrodes (8 × 11 cm), 1.2 Ah sulfurized polyacrylonitrile (SPAN)||Li pouch cell lost all its capacity after 40 cycles under a current of 600 mA, although its counterpart with coin cell configuration showed much higher capacity retention of 94% under the same test condition. Severe corrosion with uneven, porous, dendritic Li deposits is observed for pristine Li electrode in a pouch cell, especially in the near-tap and the central regions with close connection with the current collector due to the locally amplified current densities. In contrast, Li/Li–Sn alloy composite electrode displays uniform and dense Li plating behavior over the entire test area with significantly suppressed parasitic reactions and gas evolution. As such, a 1.2 Ah SPAN||Li/Li–Sn cell displays much higher capacity retention than SPAN||Li cell (87% for 100 cycles vs. 0 for 40 cycles).

Publisher Copyright

This research is supported by core funding from: SERC
Grant Reference no. : NA

This is the peer reviewed version of the following article: Duan, X., Wang, L., Li, G., Liu, X., Wan, M., Du, J., Zhan, R., Wang, W., Li, Y., Tu, S., Shen, Y., Seh, Z. W., Wang, L., & Sun, Y. (2022). Revealing the Intrinsic Uneven Electrochemical Reactions of Li Metal Anode in Ah‐Level Laminated Pouch Cells. Advanced Functional Materials, 33(6), 2210669. Portico. https://doi.org/10.1002/adfm.202210669 , which has been published in final form at doi.org/10.1002/adfm.202210669. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.

https://oar.a-star.edu.sg/communities-collections/articles/19160

1616-3028
1616-301X

Institute of Materials Research and Engineering