Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (8): 20230158.doi: 10.7503/cjcu20230158

• Physical Chemistry • Previous Articles     Next Articles

Preparation of Disodium Hydroquinone as Cathode Material for Sodium-ion Batteries

MENG Zhicheng, LU Yong, YAN Zhenhua, CHEN Jun()   

  1. College of Chemistry,Key Laboratory of Advanced Energy Materials Chemistry,Ministry of Education,Nankai University,Tianjin 300071,China
  • Received:2023-04-01 Online:2023-08-10 Published:2023-05-31
  • Contact: CHEN Jun E-mail:chenabc@nankai.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22121005)

Abstract:

Organic electrode materials are very promising for sodium-ion batteries because they have the advantages of abundant resources, environmental friendliness, recyclability, and high specific capacity against inorganic electrode materials. Among them, the organic electrode materials at reduced states can be matched with anode such as hard carbon, which makes them more promising for practical applications. However, the synthesis and application of organic cathode materials at reduced states for sodium-ion batteries are still challenging. Here we reported the successful synthesis of disodium hydroquinone and its application as cathode material for sodium-ion batteries. The synthesis was conducted by the reaction between sodium hydroxide and excess hydroquinone to generate monosodium hydroquinone, followed by heating to produce disodium hydroquinone and removing excess hydroquinone. This method is free of organic solvent, and exhibits the features of high utilization of raw materials and promises for large-scale production. When used as cathode material in sodium-ion batteries, disodium hydroquinone shows a discharge specific capacity of 182 mA·h/g at 0.1C in the first cycle. To mitigate the dissolution of disodium hydroquinone during charge/discharge processes, 6 mol/kg NaTFSI/DME was used as electrolyte, resulting in an improved capacity retention of 62% after 30 cycles. In contrast, the capacity retention is only 35% after 10 cycles in common 1 mol/L NaPF6/G2 electrolyte. This work provides new insights into the preparation and sodium-ion battery application of sodiated organic cathode materials at reduced states.

Key words: Sodium-ion battery, Cathode material, Organic electrode material, Disodium hydroquinone

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