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Temperature-Responsive Formation Cycling Enabling LiF-Rich Cathode-Electrolyte Interphase.

Luxi Hong1, Yi Zhang1, Pan Mei1

  • 1Innovation Center for Chemical Science, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China.

Angewandte Chemie (International Ed. in English)
|July 15, 2024
PubMed
Summary
This summary is machine-generated.

An additive-free strategy using low-temperature formation cycling creates a LiF-rich cathode electrolyte interphase (CEI) for advanced wide-temperature batteries. This method enhances high-temperature cyclability and low-temperature performance without side reactions.

Keywords:
LiF-rich CEIexothermic reactionformation cyclinglow temperature

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Wide-temperature battery performance is crucial for applications requiring operation across diverse thermal conditions.
  • Formation of a LiF-rich cathode-electrolyte interphase (CEI) is desirable for stable wide-temperature battery operation.
  • Conventional methods using fluorinated additives to form LiF-rich CEI often lead to unwanted side reactions.

Purpose of the Study:

  • To develop an additive-free strategy for creating a LiF-rich CEI.
  • To investigate the mechanism of LiF-rich CEI formation via low-temperature cycling.
  • To evaluate the impact of this CEI on battery performance across a wide temperature range.

Main Methods:

  • Low-temperature formation cycling at -5°C using LiNi0.33Mn0.33Co0.33O2 as a model cathode.
  • Characterization of the CEI composition using techniques to determine LiF content.
  • Electrochemical testing at various temperatures (-20°C to 60°C) to assess battery performance.
  • Theoretical simulations to understand the underlying chemical mechanisms.

Main Results:

  • Low-temperature cycling at -5°C significantly enhanced LiF content in the CEI (~17.7%) compared to 25°C formation (2.7%).
  • The mechanism involves the spontaneous and exothermic decomposition of LiPF6 on the positively charged cathode surface at low temperatures.
  • Batteries exhibited improved high-temperature (60°C) cyclability and a 100% capacity enhancement at -20°C (3C rate).
  • The strategy was successfully extended to other cathode materials (LiNi0.8Mn0.1Co0.1O2, LiCoO2, LiMn2O4).

Conclusions:

  • Additive-free, low-temperature formation cycling is an effective strategy for creating LiF-rich CEI.
  • This approach overcomes limitations of conventional methods, avoiding side reactions and improving battery stability.
  • The developed method offers a versatile pathway to enhance the performance of wide-temperature batteries.