Na3V(PO4)2: A New Layered-Type Cathode Material with High Water Stability and Power Capability for Na-Ion Batteries

Jongsoon Kim; Gabin Yoon; Hyungsub Kim; Young Uk Park; Kisuk Kang

doi:10.1021/acs.chemmater.8b00458

Na₃V(PO₄)₂: A New Layered-Type Cathode Material with High Water Stability and Power Capability for Na-Ion Batteries

Jongsoon Kim, Gabin Yoon, Hyungsub Kim, Young Uk Park, Kisuk Kang

Research output: Contribution to journal › Article › peer-review

42 Scopus citations

Abstract

We introduce Na₃V(PO₄)₂ as a new cathode material for Na-ion batteries for the first time. The structure of Na₃V(PO₄)₂ was determined using X-ray diffraction and Rietveld refinement, and its high water stability was clearly demonstrated. The redox potential of Na₃V(PO₄)₂ (∼3.5 V vs Na/Na⁺) was shown to be sufficiently high to prevent the side reaction with water (Na extraction and water insertion), ensuring its water stability in ambient air. Na₃V(PO₄)₂ also exhibited outstanding power capability, with ∼79% of the theoretical capacity being delivered at 15C. First-principles calculation combined with electrochemical experiments linked this high power capability to the low activation barrier (∼433 meV) for the well-interconnected two-dimensional Na diffusion pathway. Moreover, outstanding cyclability of Na₃V(PO₄)₂ (∼70% retention of the initial capacity after 200 cycles) was achieved at a reasonably fast current rate of 1C.

Original language	English
Pages (from-to)	3683-3689
Number of pages	7
Journal	Chemistry of Materials
Volume	30
Issue number	11
DOIs	https://doi.org/10.1021/acs.chemmater.8b00458
State	Published - 12 Jun 2018
Externally published	Yes

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title = "Na3V(PO4)2: A New Layered-Type Cathode Material with High Water Stability and Power Capability for Na-Ion Batteries",

abstract = "We introduce Na3V(PO4)2 as a new cathode material for Na-ion batteries for the first time. The structure of Na3V(PO4)2 was determined using X-ray diffraction and Rietveld refinement, and its high water stability was clearly demonstrated. The redox potential of Na3V(PO4)2 (∼3.5 V vs Na/Na+) was shown to be sufficiently high to prevent the side reaction with water (Na extraction and water insertion), ensuring its water stability in ambient air. Na3V(PO4)2 also exhibited outstanding power capability, with ∼79\% of the theoretical capacity being delivered at 15C. First-principles calculation combined with electrochemical experiments linked this high power capability to the low activation barrier (∼433 meV) for the well-interconnected two-dimensional Na diffusion pathway. Moreover, outstanding cyclability of Na3V(PO4)2 (∼70\% retention of the initial capacity after 200 cycles) was achieved at a reasonably fast current rate of 1C.",

author = "Jongsoon Kim and Gabin Yoon and Hyungsub Kim and Park, \{Young Uk\} and Kisuk Kang",

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T2 - A New Layered-Type Cathode Material with High Water Stability and Power Capability for Na-Ion Batteries

AU - Kim, Jongsoon

AU - Yoon, Gabin

AU - Kim, Hyungsub

AU - Park, Young Uk

AU - Kang, Kisuk

PY - 2018/6/12

Y1 - 2018/6/12

N2 - We introduce Na3V(PO4)2 as a new cathode material for Na-ion batteries for the first time. The structure of Na3V(PO4)2 was determined using X-ray diffraction and Rietveld refinement, and its high water stability was clearly demonstrated. The redox potential of Na3V(PO4)2 (∼3.5 V vs Na/Na+) was shown to be sufficiently high to prevent the side reaction with water (Na extraction and water insertion), ensuring its water stability in ambient air. Na3V(PO4)2 also exhibited outstanding power capability, with ∼79% of the theoretical capacity being delivered at 15C. First-principles calculation combined with electrochemical experiments linked this high power capability to the low activation barrier (∼433 meV) for the well-interconnected two-dimensional Na diffusion pathway. Moreover, outstanding cyclability of Na3V(PO4)2 (∼70% retention of the initial capacity after 200 cycles) was achieved at a reasonably fast current rate of 1C.

AB - We introduce Na3V(PO4)2 as a new cathode material for Na-ion batteries for the first time. The structure of Na3V(PO4)2 was determined using X-ray diffraction and Rietveld refinement, and its high water stability was clearly demonstrated. The redox potential of Na3V(PO4)2 (∼3.5 V vs Na/Na+) was shown to be sufficiently high to prevent the side reaction with water (Na extraction and water insertion), ensuring its water stability in ambient air. Na3V(PO4)2 also exhibited outstanding power capability, with ∼79% of the theoretical capacity being delivered at 15C. First-principles calculation combined with electrochemical experiments linked this high power capability to the low activation barrier (∼433 meV) for the well-interconnected two-dimensional Na diffusion pathway. Moreover, outstanding cyclability of Na3V(PO4)2 (∼70% retention of the initial capacity after 200 cycles) was achieved at a reasonably fast current rate of 1C.

UR - https://www.scopus.com/pages/publications/85047057869

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DO - 10.1021/acs.chemmater.8b00458

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SN - 0897-4756

VL - 30

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JO - Chemistry of Materials

JF - Chemistry of Materials

IS - 11

ER -

Na₃V(PO₄)₂: A New Layered-Type Cathode Material with High Water Stability and Power Capability for Na-Ion Batteries

Abstract

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