Al-Mg-Ti Phosphate Solid Electrolyte for Lithium Battery Ion Conductivity
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Solution Overview
Problem
Current all-solid-state lithium batteries face challenges in achieving high conductivity and controlling interfacial reactions with electrodes, which limits their performance and safety.
Innovation Solution
A lithium ion conductor with the composition Li1+x+2yAlxMgyM2−x−y(PO4)3, where M includes titanium, germanium, zirconium, hafnium, or tin, is developed, and integrated into the battery's solid electrolyte and electrode structures to enhance ion conductivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If solid electrolyte is used to prevent dendrite growth, then battery safety is improved, but the interfacial reaction with electrode is difficult to control
Solution Approach 1:
The patent applies local quality by creating a solid electrolyte with specific regional functionality through its compositional design. The Al-Mg-Ti phosphate structure provides localized regions with different properties: some areas optimized for dendrite suppression while others facilitate controlled interfacial reactions, allowing both functions to coexist within the same material.
Solution Approach 2:
The solid electrolyte composition Li1+xAlxMg1-2x(PO4)3 acts as an intermediary layer between the electrode and the bulk battery system. The specific inclusion of Ti and the optimized Al-Mg ratio create an interface that mediates between dendrite prevention requirements and controlled reaction needs, allowing ion transport while maintaining safety and reaction control.
2Stability of the object's composition
If conventional solid electrolyte composition is used to maintain stability, then structural integrity is preserved, but the energy efficiency is reduced
Solution Approach 1:
The patent changes the compositional parameters from conventional solid electrolytes by incorporating Ti and optimizing the Al-Mg ratio. This parameter modification maintains the structural stability of the phosphate framework while creating pathways for more efficient ion transport, thereby reducing energy loss without sacrificing structural integrity.
Solution Approach 2:
The solid electrolyte composition serves multiple functions simultaneously: the Li-Al-Mg-PO4 framework provides structural stability, while the Ti incorporation and optimized ratios enable efficient ion conduction. This multi-functionality allows the single material to maintain stability while improving energy efficiency, eliminating the need for separate structural and conductive components.
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 lithium ion conductor improves the battery's ion conductivity, reduces interfacial resistance, and enhances energy efficiency, leading to a more stable and efficient lithium battery.
Implementation Method 1
a lithium ion conductor having a new composition, and an electrolyte, an active material, and a lithium battery each including the lithium ion conductor
Data Source
AI summary
A lithium ion conductor represented by Formula 1:Li1+x+2yAlxMgyM2−x−y(PO4)3 Formula 1wherein, in Formula 1, M includes at least one of titanium (Ti), germanium (Ge), zirconium (Zr), hafnium (Hf), and tin (Sn), 0<x<0.6, and 0<y<0.2.