Ion‐Molecule Co‐Confining Ammonium Vanadate Cathode for High‐Performance Aqueous Zinc‐Ion Batteries

Author:

Qiu Yu1,Sun Zhihao1,Guo Zihao1,Du Benli1,Ding Han1,Wang Peng1,Tian Shaoyao1,Qian Lei1ORCID

Affiliation:

1. Key Laboratory for Liquid‐Solid Structural Evolution and Processing of Materials (Ministry of Education) Shandong University 17923 Jingshi Road Jinan 250061 China

Abstract

AbstractVanadium‐based cathode materials have attracted great attention in aqueous zinc‐ion batteries (AZIBs). However, the inferior ion transport and cyclic stability due to the strong Coulomb interaction between Zn2+ and the lattice limit their further application. In this work, CO2 molecules are in situ embedded in the interlayer structure of NH4V4O10 by decomposing excess H2C2O4·2H2O in the main framework, obtaining an ion‐molecule co‐confining NH4V4O10 for AZIB cathode material. The introduced CO2 molecules expanded the interlayer spacing of NH4V4O10, broadened the diffusion channel of Zn2+, and stabilized the structure of NH4V4O10 as the interlayer pillars together with , which effectively improved the Zn2+ diffusion kinetics and cycle stability of the electrode. In addition, the binding between and the host framework is stabilized via hydrogen bonds with CO2 molecules. NVO‐CO2‐0.8 exhibited excellent specific capacity (451.1 mAh g−1 at 2 A g−1), cycle stability (214.0 mAh g−1 at 10 A g−1 after 1000 cycles) and rate performance. This work provides new ideas and approaches for optimizing vanadium‐based materials with high‐performance AZIBs.

Funder

Natural Science Foundation of Shandong Province

Publisher

Wiley

Subject

Biomaterials,Biotechnology,General Materials Science,General Chemistry

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