Structural and electrochemical characterization of layered 0.3Li 2MnO3·0.7LiMn0.35-x /3Ni0.5-x/3Co0.15- x/3CrxO2 cathode synthesized by spray drying

Zhenjiang He, Zhixing Wang, Lei Cheng, Zhenguo Zhu, Tao Li, Xinhai Li, Huajun Guo

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Cr doped 0.3Li2MnO3·0.7LiMn 0.35-x/3Ni0.5-x /3Co0.15-x/3CrxO 2 (x = 0, 0.02, 0.04, 0.06) as a cathode material for Li-ion battery has been successfully synthesized by spray drying and subsequent calcination. The effects of Cr dopant on the structural and electrochemical properties of this material have been investigated by XRD, SEM, EDS, charge-discharge measurements, Ac impedance spectroscopy as well as cyclic voltammetry. These results demonstrated that the element Cr distributed uniformly in these materials. With the Cr content increasing, lattice parameters a and c decrease and less Li ion locates in transition metal site. Among the synthesized Cr-doped materials, when x = 0.04, this material shows the best electrochemical properties. Between 2.5 and 4.8 V (vs. Li/Li+), the initial discharge capacities of the materials increased from 143 to 168 mA h g-1 at a constant current density of 250 mA g-1. After 50 cycles, the capacity retention of the materials raised from 83% to 93%.

Original languageEnglish
Pages (from-to)647-653
Number of pages7
JournalAdvanced Powder Technology
Volume25
Issue number2
DOIs
StatePublished - Mar 2014
Externally publishedYes

Keywords

  • Cathode material
  • Elements doping
  • Lithium ion batteries
  • Spray drying

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