Issue 31, 2024

Essence of electrochemical prelithiation of the silicon anode: from the interface to the bulk phase

Abstract

When Si anode is implemented in lithium-ion cells, prelithiation is a prerequisite for improving the Si anode's electrochemical performance. In this situation, there is a great need to deeply understand the mechanisms related to prelithiation. Herein, the essence of electrochemical prelithiation of Si anode is revealed through combined studies of full cells against a NCM523 cathode. After 100 cycles against the NCM523 cathode, SEI formation makes up for 924.2 mA h g−1 of the capacity loss for the Si anode without prelithiation. After prelithiation, the lithium consumption from SEI growth is significantly reduced by 61.4%. More importantly, prelithiation plays a significant role in stabilizing the bulk phase of the Si anode, which is realized by the mitigated volume change with the prestored Li and the construction of a stable mosaic nanostructure by LiF and lithium silicate doping. For the full cell after 100 electrochemical cycles, the 858.5 mA h g−1 theoretical specific capacity of the trapped Li within the Si particles without prelithiation was reduced down to 414.9 mA h g−1 after prelithiation. These results shed new light on the prominent roles of prelithiation on the interface and the bulk Si phase, which is of key importance for optimizing Si-based anodes.

Graphical abstract: Essence of electrochemical prelithiation of the silicon anode: from the interface to the bulk phase

Supplementary files

Article information

Article type
Paper
Submitted
27 Apr 2024
Accepted
01 Jul 2024
First published
02 Jul 2024

J. Mater. Chem. A, 2024,12, 20045-20055

Essence of electrochemical prelithiation of the silicon anode: from the interface to the bulk phase

Y. Li, L. Lv, R. Liang, L. Wang, Y. Wang, Q. Qu, M. Shen and H. Zheng, J. Mater. Chem. A, 2024, 12, 20045 DOI: 10.1039/D4TA02913E

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