The LiV3O8 Superlattice Cathode with Optimized Zinc Ion Insertion Chemistry for High Mass‐Loading Aqueous Zinc‐Ion Batteries

Author:

Wu Menghua1,Shi Chuan2,Yang Junwei3,Zong Yu1,Chen Yu1,Ren Zhiguo4,Zhao Yuanxin4,Li Zhao4,Zhang Wei4,Wang Liyu1,Huang Xinliang1,Wen Wen4,Li Xiaolong4,Ning Xin1,Ren Xiaochuan1,Zhu Daming4ORCID

Affiliation:

1. Industrial Research Institute of Nonwovens & Technical Textiles, College of Textiles & Clothing, Shandong Center for Engineered Nonwovens Qingdao University Qingdao 266071 China

2. College of Physics Qingdao University Qingdao 266071 China

3. School of Arts and Sciences Shanghai Dianji University Shanghai 201306 China

4. Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201204 China

Abstract

AbstractResolving the sluggish transport kinetics of divalent Zn2+ in the cathode lattice and improving mass‐loading performance are crucial for advancing the zinc‐ion batteries (AZIBs) application. Herein, PEO‐LiV3O8 superlattice nanosheets (PEO‐LVO) with expanded interlayer spacing (1.16 nm) are fabricated to provide a high‐rate, stable lifetime, and large mass‐loading cathode. The steady in‐plane expansion without shrinkage after the first cycle, but reversible H+/Zn2+ co‐insertion in PEO‐LVO are demonstrated by operando synchrotron X‐ray diffraction and ex situ characterizations. Moreover, the large capacity of PEO‐LVO is traced back to the optimized Zn2+ insertion chemistry with increased Zn2+ storage ratio, which is facilitated by the interlayer PEO in lowering the Zn2+ diffusion barrier and increased number of active sites from additional interfaces, as anticipated by density functional theory. Due to the optimized ion insertion resulting in stalled interfacial byproducts and rapid kinetics, PEO‐LVO achieves excellent high mass‐loading performance (areal capacity up to 6.18 mAh cm−2 for freestanding electrode with 24 mg cm−2 mass‐loading and 2.8 mAh cm−2 at 130 mA cm−2 for conventional electrode with 27 mg cm−2 mass‐loading). As a proof‐of‐concept, the flexible all‐solid‐state fiber‐shaped AZIBs with high mass‐loading woven into a fabric can power an electronic watch, highlighting the application potential of PEO‐LVO cathode.

Funder

National Natural Science Foundation of China

Qingdao University

Publisher

Wiley

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