English

Influence of NaOH Concentration on Sodium Storage Performance of Na_0.44MnO₂

• Li Hui ^1, ,
• Liu Shuangyu ^1, ,
• Yuan Tianci ^2, ,
• Wang Bo ^1, ,
• Sheng Peng ^1, ,
• Xu Li ^1, ,
• Zhao Guangyao ^1, ,
• Bai Huitao ^1, ,
• Chen Xin ^1, ,
• Chen Zhongxue ^{3, ,} ,
• Cao Yuliang ^{2, ,}

• 1.

  State Key Laboratory of Advanced Power Transmission Technology, Global Energy Interconnection Research Institute Co. Ltd., Beijing 102211, China

• 2.

  Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China

• 3.

  Key Laboratory of Hydraulic Machinery Transients, Ministry of Education, School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China

Corresponding author: Chen Zhongxue, zxchen_pmc@whu.edu.cn Cao Yuliang, ylcao@whu.edu.cn

• Received Date: 16 July 2019
  Accepted Date: 30 August 2019
  Revised Date: 22 August 2019
  Available Online: 15 March 2021
• Fund Project:

  The project was supported by the Science and Technology Project of State Grid, China (SGRIDGKJ[2017]841), the National Key Basic Research Program of China (2016YFB0901500) and the National Natural Science Foundation of China (21875171, 21673165)

Abstract: Aqueous sodium ion batteries (ASIBs) have attracted considerable attention for large-scale energy storage because of their prominent advantages of low cost, high safety, and environment-friendliness. Among the reported cathode materials for ASIBs, Na_0.44MnO₂ exhibits outstanding structural and hydrochemical stability, and hence is of much interest to research scholars. However, the reversible capacity of Na_0.44MnO₂ in most of the reported ASIBs was only 40 mAh·g^-1 due to the restriction of stable working windows, although the in spite of theoretical capacity is121 mAh·g^-1. Recently, we reported a Zn/Na_0.44MnO₂ dual-ion battery (AZMDIB) based on a Na_0.44MnO₂ positive electrode, Zn negative electrode, and 6 molL^-1 NaOH electrolyte. The alkaline solution lowered the proton insertion potential and expanded the stable working window of the Na_0.44MnO₂ electrode, thus enhancing the reversible capacity to 80 mAh·g^-1. Previous studies have demonstrated that the composition, concentration, and pH of the electrolytes have significant effects on the stable electrochemical window, rate performance, cycling performance, and other electrochemical properties of aqueous batteries. In addition, it has been reported that the co-intercalation of hydrogen ions can be inhibited by increasing the pH of the electrolyte in order to improve the cyclic stability of the electrode. Therefore, exploring the effect of electrolyte concentration and pH on the electrochemical performance of Na_0.44MnO₂ can provide insight into the design and optimization of high-performance Zn/Na_0.44MnO₂ aqueous batteries. Hence, in this work, rod-like Na_0.44MnO₂ was synthesized by ball milling and subsequent high-temperature calcination, and the influence of NaOH concentration on the electrochemical performance of the Na_0.44MnO₂ electrode was investigated by adopting five different concentrated electrolytes, 1, 3, 6, 8, and 10 mol·L^-1 NaOH. The results showed that an increase in NaOH concentration is beneficial for preventing the insertion of protons and improving the cycling performance and the rate performance of the electrode; however, it also leads to premature triggering of the oxygen evolution reaction. Moreover, the rate performance would decrease at high NaOH concentration. The Na_0.44MnO₂ electrode showed optimal electrochemical performance in 8 mol·L^-1 NaOH. At a current density of 0.5C (1C = 121 mA·g^-1), a reversible specific capacity of 79.2 mAh·g^-1 was obtained, and a capacity of 35.3 mAh·g^-1 was maintained even at a high current density of 50C. In the potential window of 0.2–1.2 V (vs. NHE), the capacity retention after 500 weeks was 64.3%, which increased to 78.2% when the potential window was reduced to 0.25–1.15 V, because of the fewer side reactions. In addition, Na_0.44MnO₂ showed an exceptional ability to sustain overcharging up to 30% in a concentrated alkaline electrolyte (based on the reversible capacity of 79.2 mAh·g^-1), and the discharge capacity within 80 cycles was almost steady. The above mentioned results form the basis for possible technical directions toward the development of low-cost cathode materials to be used in ASIBs.

Key words:
• Sodium ion battery
•  /  Na_0.44MnO₂
•  /  Electrochemical performance
•  /  Concentration
•  /  Overcharging

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