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Interfacial study and modulation of high-voltage layered cathode based all-solid-state batteries.

Xiaojin Wang1, Haiqi Huang1, Jiawei Hu1

  • 1School of Chemistry, Guangdong Provincial International Joint Research Center for Energy Storage Materials, Base of Production, Education & Research on Energy Storage and Power Battery of Guangdong Higher Education Institute, Engineering Research Center of MTEES (Ministry of Education), South China Normal University, Guangzhou 510006, China.

Journal of Colloid and Interface Science
|August 11, 2024
PubMed
Summary
This summary is machine-generated.

Researchers improved solid-state battery (SSB) performance by addressing cathode-electrolyte incompatibility. An interlayer on LiCoO2 cathodes prevents detrimental surface reactions, significantly boosting cycling stability and energy density for advanced batteries.

Keywords:
Cathode-electrolyte interfaceHigh energy densityInterfacial modulationLayered cathodeSolid-state batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Layered cathodes are crucial for enhancing solid-state battery (SSB) energy density.
  • Incompatibility between layered cathodes and modified electrolytes (ME) hinders SSB performance.
  • Specific issues include TFSI- anion adsorption by Co ions and detrimental pre-formed interfaces.

Purpose of the Study:

  • To investigate the fundamental reasons for poor compatibility between layered cathodes (e.g., LiCoO2) and MEs.
  • To develop a strategy to improve the interfacial compatibility and electrochemical performance of SSBs.

Main Methods:

  • Investigated electrochemical performance and interfacial properties of SSBs with various cathodes.
  • Employed an electrostatic adsorption method to pre-add an interlayer on LiCoO2 cathode surfaces.
  • Analyzed the impact of the interlayer on energy level offsets and surface ion interactions.

Main Results:

  • Identified surface Co ion adsorption of TFSI- and detrimental pre-formed interfaces as key incompatibility issues.
  • The pre-added interlayer effectively adjusted energy level offsets and prevented direct contact between Co ions and TFSI-.
  • SSBs with the modified LiCoO2 cathode showed significantly enhanced cycling properties, achieving 68.72% capacity retention after 100 cycles (vs. 8.28% previously).

Conclusions:

  • The study elucidates the fundamental reasons for poor compatibility between layered cathodes and MEs in SSBs.
  • The proposed interlayer modification strategy is effective in enhancing SSB performance and stability.
  • Findings provide insights for designing advanced SSBs with high energy density and improved interfacial compatibility.