Volume 9, Issue 9 2100190
Research Article

Selection of Sodium Salt Electrolyte Compatible with Na0.67Ni0.15Fe0.2Mn0.65O2 Cathode for Sodium-Ion Batteries

Shimin Wang

Shimin Wang

College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, Gansu Province, 730050 China

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Chunlei Li

Chunlei Li

College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, Gansu Province, 730050 China

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Xiaoqi Fan

Xiaoqi Fan

College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, Gansu Province, 730050 China

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Shuxiang Wen

Shuxiang Wen

College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, Gansu Province, 730050 China

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Hongli Lu

Hongli Lu

College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, Gansu Province, 730050 China

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Hong Dong

Hong Dong

College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, Gansu Province, 730050 China

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Jie Wang

Jie Wang

College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, Gansu Province, 730050 China

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Yin Quan

Yin Quan

College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, Gansu Province, 730050 China

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Shiyou Li

Corresponding Author

Shiyou Li

College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, Gansu Province, 730050 China

Qinghai Research Center of Low-temperature Lithium-ion Battery Technology Engineering, Qinghai Green Grass New Energy Technology Co. Ltd, Xining, 810008 China

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First published: 01 July 2021
Citations: 7
The data that support the findings of this study are available from the corresponding author upon reasonable request.

Abstract

The construction of an optimized electrolyte system compatible with layered transition metal (TM) oxides is of great importance to advanced sodium-ion batteries (SIBs). Herein, a low-cost iron-containing manganese-based layered cathode material of Na0.67Ni0.15Fe0.2Mn0.65O2 (N-NFM) is prepared through an improved coprecipitation method. Then, the chemical properties of interfaces between the N-NFM cathode and organic liquid electrolytes based on NaClO4 and NaPF6 are investigated, respectively. Results show that the cathode electrolyte interphase (CEI) film formed in the NaPF6-based electrolyte is dense and uniform, which inhibits the dissolution of TM ions effectively and provides a low energy barrier for the transport of Na+. Apart from that the CEI film formed in the NaClO4-based electrolyte contains more organic but less inorganic compounds, resulting in an increase in impedance. In addition, it is believed that the stability of the CEI film is susceptible to the perchlorate with strong oxidizing property. In this role, a small part of the CEI film falls from the cathode surface, accelerating the dissolution of TM ions and leading to the reactivation of electrolyte decomposition.

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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