Controlled phase stability of highly Na-active triclinic structure in nanoscale high-voltage Na2-2xCo1+xP2O7 cathode for Na-ion batteries

Hee Jo Song; Jae Chan Kim; Mushtaq Ahmad Dar; Dong Wan Kim

doi:10.1016/j.jpowsour.2017.12.007

Controlled phase stability of highly Na-active triclinic structure in nanoscale high-voltage Na_2-2xCo_1+xP₂O₇ cathode for Na-ion batteries

Hee Jo Song
, Jae Chan Kim
, Mushtaq Ahmad Dar
, Dong Wan Kim^*

^*Corresponding author for this work

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

10 Citations (Scopus)

Abstract

With the increasing demand for high energy density in energy-storage systems, a high-voltage cathode is essential in rechargeable Li-ion and Na-ion batteries. The operating voltage of a triclinic-polymorph Na₂CoP₂O₇, also known as the rose form, is above 4.0 V (vs. Na/Na⁺), which is relatively high compared to that of other cathode materials. Thus, it can be employed as a potential high-voltage cathode material in Na-ion batteries. However, it is difficult to synthesize a pure rose phase because of its low phase stability, thus limiting its use in high-voltage applications. Herein, compositional-engineered, rose-phase Na_2-2xCo_1+xP₂O₇/C (x = 0, 0.1 and 0.2) nanopowder are prepared using a wet-chemical method. The Na_2-2xCo_1+xP₂O₇/C cathode shows high electrochemical reactivity with Na ions at 4.0 V, delivering high capacity and high energy density.

Original language	English
Pages (from-to)	121-127
Number of pages	7
Journal	Journal of Power Sources
Volume	377
DOIs	https://doi.org/10.1016/j.jpowsour.2017.12.007
Publication status	Published - 2018 Feb 15

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science, ICT, and Future Planning (No. 2016R1A2B2012728 ). This study was also supported by the R&D Center for Valuable Recycling (Global‐Top R&BD Program) of the Ministry of Environment (project no. R2 ‐17_2016002250005 ). The authors extend their appreciation to the International Scientific Partnership Program ISPP at King Saud University for funding this research work through (ISPP# 0076 ).

Publisher Copyright:
© 2017 Elsevier B.V.

Keywords

Cathode
High voltage
Na-ion battery
NaCoPO
Rose
Triclinic

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Energy Engineering and Power Technology
Physical and Theoretical Chemistry
Electrical and Electronic Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.jpowsour.2017.12.007

Cite this

@article{8f9cb8cca08c4887baa3fd7baf348998,

title = "Controlled phase stability of highly Na-active triclinic structure in nanoscale high-voltage Na2-2xCo1+xP2O7 cathode for Na-ion batteries",

abstract = "With the increasing demand for high energy density in energy-storage systems, a high-voltage cathode is essential in rechargeable Li-ion and Na-ion batteries. The operating voltage of a triclinic-polymorph Na2CoP2O7, also known as the rose form, is above 4.0 V (vs. Na/Na+), which is relatively high compared to that of other cathode materials. Thus, it can be employed as a potential high-voltage cathode material in Na-ion batteries. However, it is difficult to synthesize a pure rose phase because of its low phase stability, thus limiting its use in high-voltage applications. Herein, compositional-engineered, rose-phase Na2-2xCo1+xP2O7/C (x = 0, 0.1 and 0.2) nanopowder are prepared using a wet-chemical method. The Na2-2xCo1+xP2O7/C cathode shows high electrochemical reactivity with Na ions at 4.0 V, delivering high capacity and high energy density.",

keywords = "Cathode, High voltage, Na-ion battery, NaCoPO, Rose, Triclinic",

author = "Song, \{Hee Jo\} and Kim, \{Jae Chan\} and Dar, \{Mushtaq Ahmad\} and Kim, \{Dong Wan\}",

note = "Funding Information: This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science, ICT, and Future Planning (No. 2016R1A2B2012728 ). This study was also supported by the R\&D Center for Valuable Recycling (Global‐Top R\&BD Program) of the Ministry of Environment (project no. R2 ‐17\_2016002250005 ). The authors extend their appreciation to the International Scientific Partnership Program ISPP at King Saud University for funding this research work through (ISPP\# 0076 ). Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

year = "2018",

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doi = "10.1016/j.jpowsour.2017.12.007",

language = "English",

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journal = "Journal of Power Sources",

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T1 - Controlled phase stability of highly Na-active triclinic structure in nanoscale high-voltage Na2-2xCo1+xP2O7 cathode for Na-ion batteries

AU - Song, Hee Jo

AU - Kim, Jae Chan

AU - Dar, Mushtaq Ahmad

AU - Kim, Dong Wan

N1 - Funding Information: This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science, ICT, and Future Planning (No. 2016R1A2B2012728 ). This study was also supported by the R&D Center for Valuable Recycling (Global‐Top R&BD Program) of the Ministry of Environment (project no. R2 ‐17_2016002250005 ). The authors extend their appreciation to the International Scientific Partnership Program ISPP at King Saud University for funding this research work through (ISPP# 0076 ). Publisher Copyright: © 2017 Elsevier B.V.

PY - 2018/2/15

Y1 - 2018/2/15

N2 - With the increasing demand for high energy density in energy-storage systems, a high-voltage cathode is essential in rechargeable Li-ion and Na-ion batteries. The operating voltage of a triclinic-polymorph Na2CoP2O7, also known as the rose form, is above 4.0 V (vs. Na/Na+), which is relatively high compared to that of other cathode materials. Thus, it can be employed as a potential high-voltage cathode material in Na-ion batteries. However, it is difficult to synthesize a pure rose phase because of its low phase stability, thus limiting its use in high-voltage applications. Herein, compositional-engineered, rose-phase Na2-2xCo1+xP2O7/C (x = 0, 0.1 and 0.2) nanopowder are prepared using a wet-chemical method. The Na2-2xCo1+xP2O7/C cathode shows high electrochemical reactivity with Na ions at 4.0 V, delivering high capacity and high energy density.

AB - With the increasing demand for high energy density in energy-storage systems, a high-voltage cathode is essential in rechargeable Li-ion and Na-ion batteries. The operating voltage of a triclinic-polymorph Na2CoP2O7, also known as the rose form, is above 4.0 V (vs. Na/Na+), which is relatively high compared to that of other cathode materials. Thus, it can be employed as a potential high-voltage cathode material in Na-ion batteries. However, it is difficult to synthesize a pure rose phase because of its low phase stability, thus limiting its use in high-voltage applications. Herein, compositional-engineered, rose-phase Na2-2xCo1+xP2O7/C (x = 0, 0.1 and 0.2) nanopowder are prepared using a wet-chemical method. The Na2-2xCo1+xP2O7/C cathode shows high electrochemical reactivity with Na ions at 4.0 V, delivering high capacity and high energy density.

KW - Cathode

KW - High voltage

KW - Na-ion battery

KW - NaCoPO

KW - Rose

KW - Triclinic

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