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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Ionics

Background:

  • Stable interphases on electrodes are critical for rechargeable lithium (Li) battery performance.
  • High-energy batteries struggle with interphase control due to electrode reactivity and structural changes, causing degradation and slow ion transport.

Purpose of the Study:

  • To develop a method for controlling interphase formation in high-energy batteries.
  • To enhance ion transport and electrode passivation for prolonged battery lifespan.

Main Methods:

  • Introduction of a multicomponent, grain-boundary-rich interphase.
  • Application of solid-state ionics principles and geological crystallization differentiation theory.
  • Optimization of solvation chemistry and use of cost-effective electrolytes with multiple Li salts.

Main Results:

  • The novel interphase significantly improved Li-ion transport and electrode-electrolyte compatibility.
  • Microstructures rich in inorganic grain boundaries and nanosized grains were observed, enhancing Li-ion conductivity.
  • Remarkable electrochemical stability was achieved over extended cycling by inhibiting electrode corrosion.

Conclusions:

  • The developed interphase strategy offers a pathway to customize protective layers on high-capacity electrodes.
  • This approach promises to advance the development of high-energy-density batteries using cost-effective electrolytes.
  • The findings hold potential for applications including thin-Li-metal, Si-based anodes, and Li-free anodes with oxide cathodes.