Nitrogen-Rich Amorphous Lithium Electrolyte for Stable Battery Interfaces
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Solution Overview
Problem
Current solid-state lithium battery materials face challenges such as high production costs, mechanical degradation of the solid electrolyte-positive electrode interface, and limited stoichiometry leading to impurity phases.
Innovation Solution
Development of an amorphous nitrogen-rich lithium-ion conductor with a compound formula of Li7−a*α−(b−4)*β−xMaαLa3Zr2−βMbβO12−x−δXxNδ, which is cost-effectively manufactured using a method involving a nitrogen precursor, lithium precursor, lanthanum precursor, aluminum precursor, zirconium precursor, and a solvent, deposited at a low temperature to prevent undesirable reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid-state lithium battery materials are used, then ionic conductivity is achieved, but mechanical degradation of the solid electrolyte-positive electrode interface occurs and production costs are high
Solution Approach 1:
The patent modifies the chemical composition parameters of the solid electrolyte by incorporating nitrogen-rich compounds and adjusting the stoichiometry of Li-La-Zr-O system. This changes the material properties to achieve both improved stability at the interface and reduced production costs through alternative synthesis pathways
Solution Approach 2:
The patent creates a composite solid electrolyte material combining lithium lanthanum zirconium oxide (LLZO) with nitrogen-rich compounds. This composite structure provides mechanical stability to prevent interface degradation while using cost-effective precursors and synthesis methods
2Reliability
If conventional solid-state lithium battery materials are used, then ionic conductivity is achieved, but mechanical degradation of the solid electrolyte-positive electrode interface occurs
Solution Approach 1:
The patent adjusts compositional parameters by incorporating nitrogen-rich compounds into the LLZO matrix, which modifies the mechanical properties of the solid electrolyte. This enhances the mechanical strength and stability of the solid electrolyte-positive electrode interface, preventing degradation during battery operation
Solution Approach 2:
The nitrogen-rich compound acts as an intermediary layer or modifier at the solid electrolyte-positive electrode interface. This intermediary substance improves the interfacial bonding and mechanical strength, preventing direct contact and degradation between the solid electrolyte and electrode materials
3Manufacturing precision
If high temperature processing is used to manufacture solid-state lithium battery materials, then ionic conductivity is improved, but undesirable reactions occur
Solution Approach 1:
The patent changes the processing temperature parameter from high temperature to low temperature synthesis. By using nitrogen-rich precursors and alternative synthesis pathways, the material achieves the desired ionic conductivity without undergoing undesirable high-temperature reactions, maintaining material purity and stability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The amorphous nitrogen-rich lithium-ion conductor enhances stability and ionic conductivity, preventing mechanical degradation of the solid electrolyte-positive electrode interface while being significantly less expensive to produce than conventional materials.
Implementation Method 1
amorphous nitrogen-rich lithium-ion conductor having improved stability and improved ionic conductivity
Implementation Method 2
deposited at a low temperature to prevent undesirable reactions
Data Source
AI summary
A lithium ion conductor includes a compound of Formula 1:Li7−a*α−(b−4)*β−xMaαLa3Zr2−βMbβO12−x−δXxNδ Formula 1wherein in Formula 1,Ma is a cationic element having a valence of a,Mb is a cationic element having a valence of b, andX is an anion having a valence of −1,wherein, when Ma comprises H, 0≤α≤5, otherwise 0≤α≤0.75, andwherein 0≤β≤1.5, 0≤x≤1.5, (a*α+(b−4)β+x)>0, and 0<δ≤6.