Issue 39, 2023

A thermally etched N-doped porous layered silicon anode for improved cycling stability of lithium-ion batteries

Abstract

The development of advanced porous silicon-based materials for lithium-ion battery anodes, which can accommodate the expansion of electrodes during cycling, is necessary to enhance cyclability. In this study, a metal oxide-based thermal etching method, to fabricate N-doped porous layered silicon nanoflakes (P-Si NFs), is proposed. It is carried out by in situ growth of metal oxide (Fe) precursors on siloxene (Si NFs), followed by thermal etching and acid treatment. It is noteworthy that P-Si NFs retain the 2D lamellar structure of Si NFs, and the N-doped porous surface structure can effectively alleviate volume expansion during cycling and improve the efficiency of lithium-ion transport and diffusion. As a result, 89.6% (∼581 mA h g−1) of the maximum capacity (648 mA h g−1) was maintained after 500 cycles at 2 A g−1. The coulombic efficiency remained close to 100%, indicating good cycling stability of the P-Si NF anode. This work provides important insights into the design of silicon-based anodes for high-performance lithium-ion batteries.

Graphical abstract: A thermally etched N-doped porous layered silicon anode for improved cycling stability of lithium-ion batteries

  • This article is part of the themed collection: #MyFirstJMCC

Supplementary files

Article information

Article type
Paper
Submitted
25 Qas 2023
Accepted
04 Way 2023
First published
04 Way 2023

J. Mater. Chem. C, 2023,11, 13466-13475

A thermally etched N-doped porous layered silicon anode for improved cycling stability of lithium-ion batteries

B. Bai, L. Qiu, Y. Liu, Z. Su, L. Song and P. Du, J. Mater. Chem. C, 2023, 11, 13466 DOI: 10.1039/D3TC02218H

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