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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Core-Shell Structured o-LiMnO2@Li2CO3 Nanosheet Array Cathode for High-Performance, Wide-Temperature-Tolerance

Junling Guo1, Yingjun Cai2, Suojiang Zhang2

  • 1State Key Laboratory of Fine Chemicals, School of Petroleum and Chemical Engineering, Dalian University of Technology , 2 Dagong Road, Liaodongwan New District, Panjin 124221, People's Republic of China.

ACS Applied Materials & Interfaces
|June 9, 2016
PubMed
Summary

Researchers developed a new lithium-ion battery cathode material, orthorhombic-LiMnO2 coated with Li2CO3, that shows improved stability and capacity retention, even at high temperatures, for advanced energy storage applications.

Keywords:
Li2CO3lithium-ion batteriesnanosheet arrayorthorhombic-LiMnO2synergistic effect

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Developing high-capacity, stable cathode materials is crucial for lithium-ion batteries (LIBs).
  • Orthorhombic-LiMnO2 (o-LMO) offers high discharge capacity but suffers from poor cycle stability, especially at high temperatures.
  • Existing solutions often compromise rate performance or low-temperature effectiveness.

Purpose of the Study:

  • To engineer a novel cathode material with enhanced cycle stability, high capacity, and excellent rate performance for LIBs.
  • To address the limitations of o-LMO, particularly its degradation at elevated temperatures.
  • To investigate the synergistic effects of a core-shell structure and nanoarray architecture.

Main Methods:

  • Fabrication of a core-shell structured o-LiMnO2@Li2CO3 (o-LMO@Li2CO3) nanosheet array.
  • Electrochemical characterization including capacity, rate performance, and cycle stability testing at elevated temperatures.
  • Analysis of the protective role of the Li2CO3 shell against electrolyte dissolution.

Main Results:

  • The o-LMO@Li2CO3 cathode demonstrated excellent cycle performance with 79% capacity retention after 400 cycles at 60 °C.
  • High specific capacity of 207 mAh g⁻¹ at 0.5C and good rate capability (128 mAh g⁻¹ at 5C) were achieved.
  • The Li2CO3 shell effectively suppressed o-LMO dissolution, enhancing stability at high temperatures.
  • Full cells exhibited remarkable performance with ~67% capacity retention over 400 cycles at ~2C and 60 °C.

Conclusions:

  • The synergistic combination of the o-LMO core, Li2CO3 coating, and nanoarray structure provides a highly effective strategy for LIB cathode development.
  • This novel material offers a promising solution for high-energy density, high-power density, and high-stability LIB applications.
  • The o-LMO@Li2CO3 nanosheet array represents a significant advancement in cathode material design for demanding energy storage needs.