Energy Storage Science and Technology ›› 2021, Vol. 10 ›› Issue (4): 1330-1337.doi: 10.19799/j.cnki.2095-4239.2021.0080

• Energy Storage Materials and Devices • Previous Articles     Next Articles

High electrochemical stability of Al-doped spinel LiMn2O4 cathode material for aqueous lithium-ion batteries

Al-jawfi IBRAHIM(), Jiaqi ZHAO, Meng SHI, Xiaohong KANG()   

  1. Beijing Jiaotong University, Beijing 100044, China
  • Received:2021-03-05 Revised:2021-03-23 Online:2021-07-05 Published:2021-06-25
  • Contact: Xiaohong KANG E-mail:18129131@bjtu.edu.cn;xhkang@bjtu.edu.cn

Abstract:

Aqueous Li ion batteries have been extensively studied for their safety and high ionic conductivity. As an important cathode material, LiMn2O4 is limited because of its poor cyclic stability in aqueous Li ion batteries. Al-doped LiMn2O4 cathode materials were synthesized by a simple high-temperature solid phase method, using acetylene black as the template, and applied to aqueous Li ion batteries. The discharge specific capacity of LiMn2O4 (125.5 mA·h·g-1) at 0.1A·g-1 is slightly higher than that of LiMn1.9Al0.1O4(121.6 mA·h·g-1). The capacity retention of LiMn1.9Al0.1O4 cathode materials at 0.1 A·g-1 is 90% after 200 cycles, which is higher than that of LiMn2O4 (78%). At a high current density of 1 A·g-1, the LiMn1.9Al0.1O4 sample displays 88% capacity retention after 500 cycles, which is considerably higher than the LiMn2O4 sample (57%). These results confirm that Al-doped LiMn2O4 cathodes can alleviate the dissolution of Mn, inhibit the Jahn-Teller effect, and improve the cycling performance.

Key words: Al-doping, LiMn2O4, aqueous lithium-ion battery, cycling stability

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