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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
Publication Date
Apr 04, 2022
Source
[email protected]
Keywords
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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. / 1 / 1 / N / scie / scopus

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