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Constructing Robust Cathode/Electrolyte Interphase for Ultrastable 4.6 V LiCoO2 under -25 °C.

Bin Ye1,2, Mingzhi Cai3, Miao Xie1,2

  • 1State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China.

ACS Applied Materials & Interfaces
|April 20, 2022
PubMed
Summary
This summary is machine-generated.

Amorphous zirconium phosphate surface engineering enhances lithium cobalt oxide cathodes for stable high-voltage operation at -25°C. This improves battery performance in cold conditions.

Keywords:
LiCoO2cathode-electrolyte interphaseexcellent cyclabilityhigh voltagelow interface resistancelow temperature

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Low-temperature performance is critical for lithium-ion batteries.
  • Cathode material degradation at low temperatures limits battery capacity and stability.
  • High-voltage operation in lithium cobalt oxide (LiCoO2) is desirable but challenging at low temperatures.

Purpose of the Study:

  • To improve the low-temperature durability and cycling stability of high-voltage LiCoO2 cathode materials.
  • To investigate the effect of amorphous zirconium phosphate (Zr3(PO4)4) surface engineering on LiCoO2 performance.
  • To enable stable LiCoO2 operation at -25°C.

Main Methods:

  • Surface engineering of LiCoO2 using amorphous Zr3(PO4)4.
  • Electrochemical testing of surface-modified and bare LiCoO2 at low temperatures (-25°C).
  • Analysis of cathode-electrolyte interphase (CEI) formation and interface resistance.

Main Results:

  • Surface-engineered LiCoO2 achieved stable high-voltage (4.6 V) operation at -25°C.
  • The amorphous Zr3(PO4)4 layer facilitated a stable, low-resistance CEI.
  • The modified LiCoO2 exhibited a capacity of 179.2 mAh g⁻¹ at 0.2C with 91% retention after 300 cycles at 1C.
  • Bare LiCoO2 showed significantly lower capacity (161.6 mAh g⁻¹) and poor retention (1%) under identical conditions.

Conclusions:

  • Amorphous Zr3(PO4)4 surface engineering is an effective strategy to enhance the low-temperature and high-voltage performance of LiCoO2 cathodes.
  • Surface modification improves CEI stability and reduces interface resistance, crucial for cold-weather battery operation.
  • This approach offers a viable pathway for developing durable lithium-ion batteries for demanding low-temperature applications.