New stepwise potentiostatic charge protocol for preventing dendrite formations in Li metal batteries
SCIE
SCOPUS
- Title
- New stepwise potentiostatic charge protocol for preventing dendrite formations in Li metal batteries
- Authors
- KIM, MIN KYU; SHIN, YONG HOON; Ahn, Kyungho; Lee, Chul Haeng; KANG, BYOUNG WOO
- Date Issued
- 2022-06
- Publisher
- Elsevier BV
- Abstract
- Here, we report a new charge protocol for dendrite-free Li-metal battery based on the understanding the effects of over-potential on Li dendritic growth. We demonstrate that when a large over-potential is applied, the deposited Li metal shows a needle-like morphology even though a current density of a cell does not reach the limiting current density. This clearly indicates over-potential leads to the early formation of space charge region near a negative electrode, and thereby the Li dendritic growth can be easily triggered. As a result, control of the over-potential is very important for dendrite-free Li metal batteries. Through this understanding, we propose a new stepwise potentiostatic charge protocol that can keep the over-potential below a certain critical value. By applying new charge protocol, we clearly demonstrate that Ni-rich layered materials can be fully utilized without triggering the Li dendritic growth. The understanding and finding provide a novel guideline and stimulate further research to develop ways to safely operate high energy density Li metal battery. © 2022 Elsevier B.V.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/112443
- DOI
- 10.1016/j.jpowsour.2022.231348
- ISSN
- 0378-7753
- Article Type
- Article
- Citation
- Journal of Power Sources, vol. 532, page. 231348, 2022-06
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