Journal of Materials Science

, Volume 54, Issue 7, pp 5584–5594 | Cite as

Improved electrochemical performance of P2-type Na0.67Lix(Mn0.5Fe0.25Co0.25)1−xO2 cathode materials from Li ion substitution of the transition metal ions

  • Tingjian Lv
  • Li Guan
  • Peng Xiao
  • Dongyun ZhangEmail author
  • Chengkang ChangEmail author
Electronic materials


In this work, we report the preparation and the enhanced electrochemical performance of P2-type Na0.67Lix(Mn0.5Fe0.25Co0.25)1−xO2 layered cathode materials with different Li substitutions via a nanomilling-assisted solid-state method. The experimental results show that the introduced lithium ions can greatly improve the performance of the material after entering the transition metal layer. Among these synthesized samples, the Na0.67Li0.03(Mn0.5Fe0.25Co0.25)0.97O2 electrode exhibits an exceptionally high specific capacity of 190.6 mAh g−1 at 0.1 C rate and a capacity retention of 89.5% after 30 cycles. Obviously, the specific capacity retention is improved by 15.3% compared with the pristine Na0.67(Mn0.5Fe0.25Co0.25)O2 without Li incorporation (the specific capacity retention is only 74.2% after 30 cycles). Simultaneously, the sample also shows a large increase in rate performance compared to the pristine material. All of the enhancement can be explained by the fact that the introduced Li ions suppress the phase transition during the charge–discharge process and avoid the volume expansion of the electrode, which significantly reduce the occurrence of micro-cracks within the electrode. The reduced polarization, the decreased internal resistance of the prepared electrodes and the increased sodium ion diffusion coefficient, as confirmed from the CV and EIS measurements, can be regarded as the three major reasons for the enhanced electrochemical performance of the Li ion-substituted materials.



The research was supported by Science and Technology Commission of Shanghai Municipality (14520503100, 13PJ1407400 and 201310-JD-B2-009) and National Natural Science Foundation of China (21306113) and Shanghai Municipal Education Commission (15ZZ095).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.


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Authors and Affiliations

  1. 1.School of Materials Science and EngineeringShanghai Institute of TechnologyShanghaiPeople’s Republic of China
  2. 2.Shanghai Innovation Institute for MaterialsShanghai UniversityShanghaiPeople’s Republic of China

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