Kejie Jin , Liaoliao Li , Hao Tian , Mengxing Su , Yang Yang , Zhijun Wu , Shengnan He , Yanxia Liu , Chao Zheng , Jiantuo Gan , Wubin Du , Liaona She , Yaxiong Yang , Mingchang Zhang , Hongge Pan
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引用次数: 0
Abstract
Energy storage through additional anionic redox can deliver ultrahigh specific capacities of Lithium-rich manganese-based oxides cathode materials (LRMO). The commercial application of LRMO is hampered by several drawbacks, including structure degradation, continuous capacity and voltage decay, sluggish kinetics and severe irreversible oxygen release, stemming from generation of O2n− (0 ≤ n < 2) species during deep oxidation. Notably, relying solely on a single modification strategy only partially address the problems of LRMO materials. Herein, one-step phosphatizing-assisted interface engineering strategy was successfully implemented, simultaneously fabricating oxygen vacancies, spinel-like structure and an ionic conductor Li3PO4 capping layer on the surface. Among them, the formation of oxygen vacancies is accompanied by the production of a spinel phase buffer layer, which inhibits the generation of O–O dimers and oxygen loss, contributing to the stability and reversibility of anionic redox reactions. The lithium ions conductive protective layer of Li3PO4 accelerates Li+ diffusion rate while suppressing harmful interfacial side-reactions between the electrode and electrolyte. More importantly, the incorporation of P into the subsurface lattice regulates the local electron configuration and activates oxygen redox. As a result, the modification LRMO demonstrates an impressive reversible capacity of 312.9 mAh g−1, with excellent capacity retention of 91.87 % at 1 C and 82.43 % at 2 C after 500 cycles, respectively. The mult-ianionic redox mechanism provides an effective and straightforward method to stabilizing LRMO for next-generation high-energy lithium-ion batteries.
期刊介绍:
Energy Storage Materials is a global interdisciplinary journal dedicated to sharing scientific and technological advancements in materials and devices for advanced energy storage and related energy conversion, such as in metal-O2 batteries. The journal features comprehensive research articles, including full papers and short communications, as well as authoritative feature articles and reviews by leading experts in the field.
Energy Storage Materials covers a wide range of topics, including the synthesis, fabrication, structure, properties, performance, and technological applications of energy storage materials. Additionally, the journal explores strategies, policies, and developments in the field of energy storage materials and devices for sustainable energy.
Published papers are selected based on their scientific and technological significance, their ability to provide valuable new knowledge, and their relevance to the international research community.