Energy Storage Science and Technology ›› 2020, Vol. 9 ›› Issue (5): 1402-1409.doi: 10.19799/j.cnki.2095-4239.2020.0080

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Using spent lithium manganate to prepare Li0.25Na0.6MnO2 as cathode material in sodium-ion batteries

Xuejiao NIE1(), Jinzhi GUO2, Meiyi WANG1, Zhenyi GU2, Xinxin ZHAO1, Xu YANG1, Haojie LIANG2, Xinglong WU1,2()   

  1. 1.Faculty of Chemistry, Northeast Normal University, Changchun 130024, Jilin, China
    2.Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun 130024, Jilin, China
  • Received:2020-02-23 Revised:2020-03-04 Online:2020-09-05 Published:2020-09-08
  • Contact: Xinglong WU E-mail:niexj320@nenu.edu.cn;xinglong@nenu.edu.cn

Abstract:

With the widespread application of lithium-ion batteries (LIBs) in many energy storage fields, spent LIBs are being produced in large quantities. Discarding LIBs without any treatment causes great harm to the natural environment on which human beings rely for survival and is a waste of resources. In this paper, we collect lithium manganate cathodes from spent LIBs as the main raw materials. Via a combination of ball milling and high temperature sintering, the sodium-ion battery (SIB) cathode material Li0.25Na0.6MnO2 (LNMO) is successfully synthesized; its electrochemical performance, kinetic characteristics, and the phase transition process caused by ion de-insertion are then studied. The results show that LNMO has a high specific capacity (131.5 mA·h/g) and an excellent rate performance (97.9% capacity retention). The apparent ion diffusion coefficient of the electrode is on the order of 10-12 cm2/s, showing a fast ion de-insertion ability and kinetic process, which is one of the main reasons for its excellent rate performance. Recycling spent lithium manganate materials and applying them to the next generation of low cost SIBs has the dual significance of simultaneously achieving the effective recycling of spent LIBs and finding a source of raw SIBs materials.

Key words: spent lithium ion batteries, lithium manganite cathode, recycling and reuse, sodium ion batteries, Li0.25Na0.6MnO2

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