Metal Oxynitride Interface Layer for Solid-State Battery Anodes
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Solution Overview
Problem
Lithium-ion batteries face issues with dendrite formation during charging and discharging, leading to decreased efficiency and shortened lifespan, particularly in next-generation batteries using lithium metal anodes.
Innovation Solution
Incorporating an anode layer with an interface layer made of metal oxynitride (MxNyOz) and optional buffer layers, where M is silicon, aluminum, or hafnium, to enhance interfacial adhesion and prevent dendrite growth, along with a solid electrolyte layer and cathode layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium metal is used as anode material to improve energy density, then energy density is improved, but dendrite formation occurs leading to decreased charging and discharging efficiency and shortened lifespan
Solution Approach 1:
A buffer layer comprising silver-carbon composite (AgC), germanium telluride (GeTe) oxide, hafnium (Hf) oxide, zirconium (Zr) oxide, germanium (Ge) oxide, selenium (Se) oxide, or telluride (Te) oxide is introduced between the lithium metal anode and the solid electrolyte. This intermediary buffer layer prevents direct contact and dendrite formation while maintaining ionic conductivity, thus preserving high energy density without sacrificing reliability.
2Reliability
If interface layer made of metal oxynitride is introduced to prevent dendrite growth, then reliability is improved, but device complexity increases
Solution Approach 1:
The interface layer is constructed using composite materials, specifically a buffer layer comprising silver-carbon composite (AgC) or other metal oxides, combined with a metal oxynitride layer (MxNyOz where M is Si, Al, or Hf). This composite structure provides synergistic effects: the buffer layer offers mechanical stability and ionic conductivity, while the metal oxynitride layer provides chemical stability and dendrite suppression, achieving reliable dendrite prevention without excessive structural complexity.
Data Source
AI summary
Provided is an anode for an all-solid-state battery including an anode layer, and an interface layer on the anode layer, wherein the anode layer includes an anode active material, and wherein the interface layer includes a metal oxynitride satisfying MxNyOz, where, Mis one or more of silicon (Si), aluminum (Al), and hafnium (Hf), 0<x<1, 0<y<1, 0<z<1, and x+y+z=1.