Stable Rooted Solid Electrolyte Interphase for Lithium-Ion Batteries

Hui Jiang; Jie Liu; Minmin Wang; Jin Wang; Tongming Sun; Lanping Hu; Jinli Zhu; Yanfeng Tang; Jiacheng Wang

doi:10.1021/acs.jpclett.1c02969

Stable Rooted Solid Electrolyte Interphase for Lithium-Ion Batteries

J Phys Chem Lett. 2021 Nov 4;12(43):10521-10531. doi: 10.1021/acs.jpclett.1c02969. Epub 2021 Oct 22.

Authors

Hui Jiang¹, Jie Liu¹, Minmin Wang², Jin Wang², Tongming Sun², Lanping Hu², Jinli Zhu², Yanfeng Tang², Jiacheng Wang^{1

3}

Affiliations

¹ State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
² College of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, China.
³ Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, 100049 Beijing, China.

PMID: 34677983
DOI: 10.1021/acs.jpclett.1c02969

Abstract

Metal oxide-based materials are attractive anode candidates for lithium-ion batteries (LIBs) because of their high theoretical capacity. However, these materials suffer from large volume expansion and poor stability of solid electrolyte interphase (SEI) during the charge-discharge process, casusing rapid capacity degradation. Herein, we report that Li₃PO₄-rooted and intact SEI in situ formed on the phosphate-modified SnO₂/CNFs during cycling. The phosphate anions in the anode, could serve as the root to form Li₃PO₄ by bonding with Li ions and participate in the formation of the SEI, thus firmly anchoring and stabilizing the SEI layer. The rooted Li₃PO₄ and enriched LiF in the SEI could synergistically enhance the Li-ion diffusion, significantly reduce the volume expansion, and lead to ultrastable cycling performance over 1100 charge-discharge cycles at 1 A g^-1. This work provides a new avenue for forming stable SEI rooted into the anode and inspires the development of interface engineering toward electrochemical energy storage.