Volume 20, Issue 43 2403275
Research Article

Interacted Ternary Component Ensuring High-Security Eutectic Electrolyte for High Performance Sodium-Metal Batteries

Fan Feng

Fan Feng

School of Material Science and Engineering, China University of Petroleum Huadong-Qingdao Campus, Qingdao, 266580 China

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Zheng Liu

Corresponding Author

Zheng Liu

School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu, 225009 China

E-mail: [email protected]; [email protected]; [email protected]

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Yingchun Yan

Yingchun Yan

School of Material Science and Engineering, China University of Petroleum Huadong-Qingdao Campus, Qingdao, 266580 China

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Min Gong

Min Gong

School of Material Science and Engineering, China University of Petroleum Huadong-Qingdao Campus, Qingdao, 266580 China

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Guanwen Wang

Guanwen Wang

School of Material Science and Engineering, China University of Petroleum Huadong-Qingdao Campus, Qingdao, 266580 China

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Chunlei Chi

Chunlei Chi

School of Material Science and Engineering, China University of Petroleum Huadong-Qingdao Campus, Qingdao, 266580 China

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Bin Qi

Bin Qi

School of Material Science and Engineering, China University of Petroleum Huadong-Qingdao Campus, Qingdao, 266580 China

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Chao Huangfu

Chao Huangfu

School of Material Science and Engineering, China University of Petroleum Huadong-Qingdao Campus, Qingdao, 266580 China

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Xinhou Yang

Xinhou Yang

School of Material Science and Engineering, China University of Petroleum Huadong-Qingdao Campus, Qingdao, 266580 China

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Ke Cao

Ke Cao

School of Material Science and Engineering, China University of Petroleum Huadong-Qingdao Campus, Qingdao, 266580 China

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Fanshuai Meng

Fanshuai Meng

School of Material Science and Engineering, China University of Petroleum Huadong-Qingdao Campus, Qingdao, 266580 China

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Tong Wei

Corresponding Author

Tong Wei

School of Material Science and Engineering, China University of Petroleum Huadong-Qingdao Campus, Qingdao, 266580 China

Institute of Energy, Hefei Comprehensive National Science Center, Hefei, Anhui, 230031 China

E-mail: [email protected]; [email protected]; [email protected]

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Zhuangjun Fan

Corresponding Author

Zhuangjun Fan

School of Material Science and Engineering, China University of Petroleum Huadong-Qingdao Campus, Qingdao, 266580 China

Institute of Energy, Hefei Comprehensive National Science Center, Hefei, Anhui, 230031 China

E-mail: [email protected]; [email protected]; [email protected]

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First published: 27 June 2024
Citations: 8

Abstract

Due to the intrinsic flame-retardant, eutectic electrolytes are considered a promising candidate for sodium-metal batteries (SMBs). However, the high viscosity and ruinous side reaction with Na metal anode greatly hinder their further development. Herein, based on the Lewis acid-base theory, a new eutectic electrolyte (EE) composed of sodium bis(trifluoromethanesulfonyl)imide (NaTFSI), succinonitrile (SN), and fluoroethylene carbonate (FEC) is reported. As a strong Lewis base, the ─C≡N group of SN can effectively weaken the interaction between Na+ and TFSI, achieving the dynamic equilibrium and reducing the viscosity of EE. Moreover, the FEC additive shows a low energy level to construct thicker and denser solid electrolyte interphase (SEI) on the Na metal surface, which can effectively eliminate the side reaction between EE and Na metal anode. Therefore, EE-1:6 + 5% FEC shows high ionic conductivity (2.62 mS cm−1) and ultra-high transference number of Na+ (0.96). The Na||Na symmetric cell achieves stable Na plating/stripping for 1100 h and Na||Na3V2(PO4)3/C cell shows superior long-term cycling stability over 2000 cycles (99.1% retention) at 5 C. More importantly, the Na||NVP/C pouch cell demonstrates good cycling performance of 102.1 mAh g−1 after 135 cycles at 0.5 C with an average coulombic efficiency of 99.63%.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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