DataVXAdvanced Energy MaterialsPaper
journal article·2021-01Open access

Counter‐Intuitive Structural Instability Aroused by Transition Metal Migration in Polyanionic Sodium Ion Host

Rui Liu, Shiyao Zheng, Yifei Yuan, Pengfei Yu, Ziteng Liang, Weimin Zhao, Reza Shahbazian‐Yassar, Jianxu Ding, Jun Lu, Yong Yang

Advanced Energy Materials· Volume 11· Issue 3
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Abstract

Abstract The structure of polyanionic materials is conventionally known to be free of transition metal migration and structurally stable when storing/releasing sodium ions. Herein, the observation of enhanced cycling stability of a typical polyanionic cathode, Na3VCr(PO4)3 (NVCP) at lower temperature (−15 °C vs 30 °C), triggers the exploration of its structural origins with a surprising finding that the migratable nature of vanadium in NVCP leads to detrimental structural degradation of the polyanionic host upon cycling. The correlation between long range and short range structural change associated with this atomic migration is established via a strong combination of various in situ/ex situ characterization tools, revealing the essential V–to–Na1 site migration. Such transition metal migration is effectively suppressed when V atoms are pinned to their original position in the lattice by lowering the temperature. More importantly and practically, a room temperature‐based deep sodiation strategy is further developed to recover the structure. This work challenges the long‐standing assumption of the stability of the polyanionic framework structure and calls for urgent attention to the structural understanding of the NVCP system as well as strategy development for property enhancement.
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Research context

Energy storage

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Conducting polymers and applications

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

Affiliations

Collaborative Innovation Center of Chemistry for Energy Materials State Key Laboratory for Physical Chemistry of Solid Surface Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China

School of Materials Science and Engineering Shandong University of Science and Technology Qingdao 266590 China

Chemical Sciences and Engineering Division Argonne National Laboratory 9700 South Cass Avenue Lemont IL 60439 USA

Department of Mechanical and Industrial Engineering The University of Illinois at Chicago Chicago IL 60607 USA

Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China

School of Energy Research Xiamen University Xiamen 361005 China

Funding

National Basic Research Program of China · National Natural Science Foundation of China · National Science Foundation · Argonne National Laboratory · U.S. Department of Energy · Office of Energy Efficiency and Renewable Energy · Vehicle Technologies Office · University of Chicago

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