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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Improving the High-Voltage Li2FeMn3O8 Cathode by Chlorine Doping.

Jiaqi Dai1, Lihui Zhou1, Xiaogang Han1

  • 1Department of Materials Science and Engineering, University of Maryland , College Park, Maryland 20742, United States.

ACS Applied Materials & Interfaces
|April 6, 2016
PubMed
Summary

Chlorine doping enhances lithium ion battery performance by increasing the capacity and working voltage of Li2FeMn3O8 cathode materials. This low-cost method improves electrochemical properties for better energy density.

Keywords:
Li2FeMn3O8chlorine dopinghigh-voltage cathodelithium ion batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • High-energy-density lithium ion batteries require high-capacity, high-voltage cathode materials.
  • Li2FeMn3O8 offers high working voltage, low toxicity, and low cost but suffers from intrinsic defects limiting performance.
  • Theoretical voltage (4.9 V) and capacity (148 mAh/g) of Li2FeMn3O8 are difficult to achieve.

Purpose of the Study:

  • To investigate the effect of chlorine (Cl) doping on the electrochemical properties of Li2FeMn3O8 cathode materials.
  • To enhance the capacity and working voltage of Li2FeMn3O8 for improved lithium ion battery performance.

Main Methods:

  • Synthesis and characterization of Cl-doped Li2FeMn3O8.
  • X-ray photoelectron spectroscopy (XPS) to analyze cation valence states and electron binding energies.
  • Electrochemical testing to evaluate capacity and working voltage.

Main Results:

  • Cl doping effectively increased the capacity and working voltage of the Li2FeMn3O8 cathode.
  • XPS analysis indicated that Cl doping reduced cation valence states and increased electron binding energies.
  • The enhanced electrochemical performance demonstrates the potential of Cl doping.

Conclusions:

  • Cl doping is a promising and low-cost strategy to improve the electrochemical performance of Li2FeMn3O8 cathode materials.
  • This method can potentially be applied to other oxide cathode materials like LiCoO2 and LiMn2O4.
  • Cl doping offers a viable route to achieve higher energy density in lithium ion batteries.