Issue 10, 2023

Understanding the lithiation mechanism of Li2O-doped spinel high-entropy oxides as anode materials for Li-ion batteries

Abstract

High-entropy oxides (HEOs) have started to attract widespread interest as anode materials for lithium-ion batteries (LIBs), because of their high theoretical discharge capacities, fast ionic conductivity, and stable structure caused by the unique entropy stabilization effect and the “cocktail” effect. However, the lithiation mechanism of HEO anode is still conversional, which prevents its further development. Herein, we propose an Li2O-doping strategy for improving the lithium storage ability of HEO anodes. Li2O is successfully introduced into the spinel high-entropy oxide to obtain a (FeMgNiCrMnLi)3O4 anode (Li-SHEO) via a solution combustion synthesis and ball milling method. Experimental results show Li doping would induce the growth of oxygen vacancies and regulate the conversion reactions during the discharge process, leading to improved electrochemical performance. As a result, the lithiation process of an Li-SHEO anode includes an enhanced Li+ ion intercalation process and a typical conversion reaction. Compared with the (FeMgNiCrMnLi)3O4 (SHEO) anode, the Li-SHEO anode shows a high reversible discharge capacity of 850.7 mA h g−1 after 200 cycles under a large current density of 2.0 A g−1.

Graphical abstract: Understanding the lithiation mechanism of Li2O-doped spinel high-entropy oxides as anode materials for Li-ion batteries

Associated articles

Article information

Article type
Paper
Submitted
11 Jūl. 2023
Accepted
21 Aug. 2023
First published
22 Aug. 2023
This article is Open Access
Creative Commons BY-NC license

Energy Adv., 2023,2, 1685-1692

Understanding the lithiation mechanism of Li2O-doped spinel high-entropy oxides as anode materials for Li-ion batteries

G. Ma, Y. Zheng, F. Meng and R. Hu, Energy Adv., 2023, 2, 1685 DOI: 10.1039/D3YA00326D

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