journal article·2022-11-08Open access

A Nearly Zero-Strain Li-Rich Rock-Salt Oxide with Multielectron Redox Reactions as a Cathode for Li-Ion Batteries

Ke Zhou, Yining Li, Yang Ha, Maojie Zhang, Walid Dachraoui, Haodong Liu, Chunyang Zhang, Xiangsi Liu, Fengchen Liu, Corsin Battaglia, Wanli Yang, Jianjun Liu, Yong Yang

Chemistry of Materials· Volume 34· Issue 21

Abstract

Li-rich oxide cathodes are drawing increasing attention as next-generation cathode materials for the development of high-energy-density Li-ion batteries due to their strikingly high capacities. However, transition-metal migration, irreversible structural phase transformations, and the irreversible release of oxygen are responsible for rapid capacity and voltage decay. This study reports a Li-rich cation-ordered rock-salt oxide LixV0.4Ti0.4O2 (LVTO, x = 0.97/1.2) with space group Fd3̅m that delivers a high capacity of over 250 mAh g–1 and capacity retention up to 89% after 50 cycles. A comprehensive experimental analysis confirms that the capacity can be attributed to the reversible V3+/V5+ multielectron cationic redox reactions and a minor contribution from reversible anionic redox reactions. Importantly, LVTO exhibits nearly zero-strain behavior upon (dis)charge cycling cycles, which is associated with reversible V migration from octahedral to tetrahedral sites. Our results demonstrate that Li-rich rock-salt oxide LVTO could be a promising cobalt-free cathode material for Li-ion batteries.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Advancements in Battery Materials · Transition Metal Oxide Nanomaterials · Supercapacitor Materials and Fabrication

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China

Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland

State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Center for Memory and Recording Research, University of California, San Diego, La Jolla, California 92093, United States

Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Ecole Polytechnique Federale de Lausanne, Lausanne 1015, Switzerland

Information Technology Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Funding

Ministry of Science and Technology of the People's Republic of China · Vehicle Technologies Program · Science and Technology Commission of Shanghai Municipality · China Scholarship Council · National Natural Science Foundation of China · Metrohm Foundation

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