Effect of the N,S-Codoped Carbon Layer on the Rate Performance of Air-Stable Lithium Iron Oxide Prelithiation Additives

Bin Zhu; Wei Zhang; Zheng Li; Qiyu Wang; Naifeng Wen; Zhian Zhang

doi:10.1021/acsami.3c09490

Effect of the N,S-Codoped Carbon Layer on the Rate Performance of Air-Stable Lithium Iron Oxide Prelithiation Additives

ACS Appl Mater Interfaces. 2023 Sep 27;15(38):45290-45299. doi: 10.1021/acsami.3c09490. Epub 2023 Sep 12.

Authors

Bin Zhu¹, Wei Zhang², Zheng Li¹, Qiyu Wang¹, Naifeng Wen¹, Zhian Zhang¹

Affiliations

¹ School of Metallurgy and Environment, Engineering Research Center of the Ministry of Education for Advanced Battery Materials, Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy, Central South University, Changsha 410083, P. R. China.
² Christopher Ingold Laboratory, Department of Chemistry, University College London, London WC1H 0AJ, U.K.

PMID: 37699051
DOI: 10.1021/acsami.3c09490

Abstract

Lithium iron oxide (Li₅FeO₄, LFO) holds great promise in cathode prelithiation additives for lithium-ion batteries. However, it is hard to make full use of the power under high current rates due to its poor air stability and electronic conductivity. The carbon protective layer is an effective approach, and introducing heteroatoms would be beneficial to further improving Li⁺ kinetics. However, the interplay between the dopants and Li⁺ is always ignored. Herein, we aim to reveal the interaction among Li⁺ ions and the defects of carbon layers from nitrogen/sulfur dopants and the corresponding influence on delithiation performances of LFO. It is found that the codoping of nitrogen and sulfur on carbon layers contributes to the boosted capacity and rate capability. The modified SNC@LFO presents a large irreversible capacity (779.3 mAh g^-1 at 0.1 C) and excellent rate performance (537.1 mAh g^-1 at 1 C), which is up to 16.6 and 64.0%, respectively, compared to LFO.

Keywords: Li5FeO4; air stability; doping; lithium-ion batteries; prelithiation; rate performance.