Ultrastable and High Energy Calcium Rechargeable Batteries Enabled by Calcium Intercalation in a NASICON Cathode

Chunhong Chen, Fangyi Shi, Shishi Zhang, Yaqiong Su, Zheng Long Xu (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)

Abstract

Ca-ion batteries (CIBs) have been considered a promising candidate for the next-generation energy storage technology owing to the abundant calcium element and the low reduction potential of Ca2+/Ca. However, the large size and divalent nature of Ca2+ induce significant volume change and sluggish ion mobility in intercalation cathodes, leading to poor reversibly and low energy/power densities for CIBs. Herein, a polyanionic Na superionic conduction (NASICON)-typed Na-vacant Na1V2(PO4)2F3 (N1PVF3) with sufficient interstitial spaces is reported as ultra-stable and high-energy Ca ion cathodes. The N1PVF3 delivers exceptionally high Ca storage capacities of 110 and 65 mAh g-1 at 10 and 500 mA g–1, respectively, and a record-long cyclability of 2000 cycles. More interestingly, by tailoring the fluorine content in N1PVFx (1 ≤ x ≤ 3), the high working potential of 3.5 V versus Ca2+/Ca is achievable. In conjunction with Ca metal anode and a compatible electrolyte, Ca metal batteries with N1VPF3 cathodes are constructed, which deliver an initial energy density of 342 W h kg-1, representing one of the highest values thus far reported for CIBs. Origins of the uncommonly stable and high-power capabilities for N1PVF3 are elucidated as the small volume changes and low cation diffusion barriers among the cathodes.

Original languageEnglish
Article number2107853
JournalSmall
Volume18
Issue number14
DOIs
Publication statusPublished - 19 Feb 2022

Keywords

  • Ca ion batteries
  • cathode materials
  • full cells
  • NASICON structure

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

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