Newly developed γ-NaTiOPO4 by simple solid-state synthesis for anode material of Na-ion batteries in both nonaqueous and aqueous electrolytes

Kim, D; Park, H; Avdeev, M; Kim, M; Kang, B

Newly developed γ-NaTiOPO4 by simple solid-state synthesis for anode material of Na-ion batteries in both nonaqueous and aqueous electrolytes

Date

2022-09

Authors

Publisher

Elsevier

Abstract

Sodium-ion batteries (SIBs) are a promising next-generation energy storage system in terms of cost due to the abundance of sodium. However, obtaining good anode materials for SIBs remains a challenge. NaTiOPO4 has been investigated as an anode not only for SIBs but also for aqueous SIBs. Despite the various NaTiOPO4 polymorphs, only the β-NaTiOPO4 phase has been investigated as an anode for SIBs due to the limited synthesis process. In this study, we successfully stabilized γ-NaTiOPO4 via our newly developed solid-state synthesis process. In addition, its electrochemical properties as an anode for SIBs were investigated in this study. The synthesized material demonstrates a high voltage of 1.7 and ∼1.5 V vs Na/Na+ with 120 mAh/g and good capacity retention of 64% for up to 500 cycles at 0.5C in a nonaqueous electrolyte. In an aqueous electrolyte, Na0·44MnO2//γ-NaTiOPO4 full cell achieves excellent stable capacity retention with a high Coulombic efficiency for 175 cycles. It shows high cycling stability with a three-dimensional framework despite the relatively high redox potential. Thus, it demonstrates that γ-NaTiOPO4 is a promising anode material for both nonaqueous and aqueous rechargeable SIBs. © 2022 Elsevier B.V. All rights reserved.

Description

This work was supported by the National Research Foundation of Korea Grant funded by the Korean Government NRF-2019R1A2C2007933, NRF-2021R1A4A1032162 and NRF-2022R1C1C1011543. This study was supported by Brain Korea 21 FOUR project for Education and research center for future materials. The present research has been conducted by the Research Grant of Kwangwoon University in 2022.

Keywords

Electrolytes, Synthesis, Anodes, Sodium, Titanium, Aqueous solutions, Energy storage systems

Citation

Kim, D., Park, H., Avdeev, M., Kim, M., & Kang, B. (2022). Newly developed γ-NaTiOPO4 by simple solid-state synthesis for anode material of Na-ion batteries in both nonaqueous and aqueous electrolytes. Journal of Power Sources, 541, 231692. doi.org/10.1016/j.jpowsour.2022.231692