Lattice Water for the Enhanced Performance of Amorphous Iron Phosphate in Sodium-Ion Batteries

Soo Yeon Lim; Ji Hoon Lee; Sangryun Kim; Jaeho Shin; Wonchang Choi; Kyung Yoon Chung; Dae Soo Jung; Jang Wook Choi

doi:10.1021/acsenergylett.7b00120

Lattice Water for the Enhanced Performance of Amorphous Iron Phosphate in Sodium-Ion Batteries

Soo Yeon Lim
, Ji Hoon Lee
, Sangryun Kim
, Jaeho Shin
, Wonchang Choi
, Kyung Yoon Chung
, Dae Soo Jung
, Jang Wook Choi

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

54 Scopus citations

Abstract

We report amorphous iron phosphate with lattice water, namely FePO₄·xH₂O (x ∼ 2.39), as a promising sodium-ion battery (SIB) cathode. After carbon coating, micrometer-sized FePO₄·xH₂O exhibits a reversible capacity that is higher than that of its counterpart without lattice water (130.0 vs 50.6 mAh g^-1 at 0.15C rate) along with clearly enhanced rate capability and cyclability. The superior electrochemical performance of FePO₄·xH₂O is attributed to the lattice water that facilitates sodium-ion diffusion via enlarged channel dimensions and the screening of the electrostatic interactions between sodium ions and host anions. The amorphous phase is also advantageous in accommodating the stress created in the host framework during sodium-ion (de)intercalation. The presence of lattice water also protects the oxidation state of Fe from reductive surface carbon coating and slightly lowers the operation voltage via reduced inductive effect. The current study provides a useful insight into how to design SIB electrode materials particularly focusing on facile sodium-ion diffusion.

Original language	English
Pages (from-to)	998-1004
Number of pages	7
Journal	ACS Energy Letters
Volume	2
Issue number	5
DOIs	https://doi.org/10.1021/acsenergylett.7b00120
State	Published - 12 May 2017

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title = "Lattice Water for the Enhanced Performance of Amorphous Iron Phosphate in Sodium-Ion Batteries",

abstract = "We report amorphous iron phosphate with lattice water, namely FePO4·xH2O (x ∼ 2.39), as a promising sodium-ion battery (SIB) cathode. After carbon coating, micrometer-sized FePO4·xH2O exhibits a reversible capacity that is higher than that of its counterpart without lattice water (130.0 vs 50.6 mAh g-1 at 0.15C rate) along with clearly enhanced rate capability and cyclability. The superior electrochemical performance of FePO4·xH2O is attributed to the lattice water that facilitates sodium-ion diffusion via enlarged channel dimensions and the screening of the electrostatic interactions between sodium ions and host anions. The amorphous phase is also advantageous in accommodating the stress created in the host framework during sodium-ion (de)intercalation. The presence of lattice water also protects the oxidation state of Fe from reductive surface carbon coating and slightly lowers the operation voltage via reduced inductive effect. The current study provides a useful insight into how to design SIB electrode materials particularly focusing on facile sodium-ion diffusion.",

author = "Lim, \{Soo Yeon\} and Lee, \{Ji Hoon\} and Sangryun Kim and Jaeho Shin and Wonchang Choi and Chung, \{Kyung Yoon\} and Jung, \{Dae Soo\} and Choi, \{Jang Wook\}",

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doi = "10.1021/acsenergylett.7b00120",

language = "English",

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T1 - Lattice Water for the Enhanced Performance of Amorphous Iron Phosphate in Sodium-Ion Batteries

AU - Lim, Soo Yeon

AU - Lee, Ji Hoon

AU - Kim, Sangryun

AU - Shin, Jaeho

AU - Choi, Wonchang

AU - Chung, Kyung Yoon

AU - Jung, Dae Soo

AU - Choi, Jang Wook

PY - 2017/5/12

Y1 - 2017/5/12

N2 - We report amorphous iron phosphate with lattice water, namely FePO4·xH2O (x ∼ 2.39), as a promising sodium-ion battery (SIB) cathode. After carbon coating, micrometer-sized FePO4·xH2O exhibits a reversible capacity that is higher than that of its counterpart without lattice water (130.0 vs 50.6 mAh g-1 at 0.15C rate) along with clearly enhanced rate capability and cyclability. The superior electrochemical performance of FePO4·xH2O is attributed to the lattice water that facilitates sodium-ion diffusion via enlarged channel dimensions and the screening of the electrostatic interactions between sodium ions and host anions. The amorphous phase is also advantageous in accommodating the stress created in the host framework during sodium-ion (de)intercalation. The presence of lattice water also protects the oxidation state of Fe from reductive surface carbon coating and slightly lowers the operation voltage via reduced inductive effect. The current study provides a useful insight into how to design SIB electrode materials particularly focusing on facile sodium-ion diffusion.

AB - We report amorphous iron phosphate with lattice water, namely FePO4·xH2O (x ∼ 2.39), as a promising sodium-ion battery (SIB) cathode. After carbon coating, micrometer-sized FePO4·xH2O exhibits a reversible capacity that is higher than that of its counterpart without lattice water (130.0 vs 50.6 mAh g-1 at 0.15C rate) along with clearly enhanced rate capability and cyclability. The superior electrochemical performance of FePO4·xH2O is attributed to the lattice water that facilitates sodium-ion diffusion via enlarged channel dimensions and the screening of the electrostatic interactions between sodium ions and host anions. The amorphous phase is also advantageous in accommodating the stress created in the host framework during sodium-ion (de)intercalation. The presence of lattice water also protects the oxidation state of Fe from reductive surface carbon coating and slightly lowers the operation voltage via reduced inductive effect. The current study provides a useful insight into how to design SIB electrode materials particularly focusing on facile sodium-ion diffusion.

UR - https://www.scopus.com/pages/publications/85033672664

U2 - 10.1021/acsenergylett.7b00120

DO - 10.1021/acsenergylett.7b00120

M3 - Article

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SN - 2380-8195

VL - 2

SP - 998

EP - 1004

JO - ACS Energy Letters

JF - ACS Energy Letters

IS - 5

ER -

Lattice Water for the Enhanced Performance of Amorphous Iron Phosphate in Sodium-Ion Batteries

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