Al-Doped Sheet LLZO Composite Electrolyte for Continuous Li-Ion Conduction
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Solution Overview
Problem
Existing composite solid-state electrolytes have insufficient effects in inhibiting lithium dendrites and improving ionic conductivity, as the granular doped electrolytes fail to provide a continuous lithium ion conduction channel.
Innovation Solution
An Al-doped sheet LLZO composite solid-state electrolyte is developed, where the Al-doped LLZO is formed into a sheet structure and dispersed in a polymer substrate, providing a continuous conduction channel for lithium ions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If granular inorganic powder is incorporated into PEO polymer matrix, then mechanical strength and electrochemical stability are improved, but continuous lithium ion conduction channel is not provided
Solution Approach 1:
The patent changes the morphological parameter of the inorganic filler from granular to sheet structure. This parameter change enables the filler to form continuous conduction channels while maintaining mechanical strength, as the sheet structure can stack and connect to form pathways for lithium ion transport throughout the polymer matrix.
Solution Approach 2:
The patent creates a composite material system combining PEO polymer matrix with sheet-structured inorganic fillers (such as Li2SiO3, Al2O3, or TiO2). This composite structure leverages the mechanical strength of the inorganic sheets while their layered morphology provides continuous conduction channels, simultaneously addressing both requirements.
2Reliability
If granular LLZO is doped into PEO-based composite solid-state electrolyte, then electrochemical stability is enhanced, but lithium dendrite inhibition and ionic conductivity are insufficient
Solution Approach 1:
The patent transforms the morphological parameter of LLZO from granular to sheet structure. The sheet structure provides extended planar surfaces that can effectively block lithium dendrite growth paths while maintaining electrochemical stability. The increased surface area to volume ratio of sheets also enhances ionic conductivity compared to granular structures.
Solution Approach 2:
The patent transitions from zero-dimensional granular LLZO to two-dimensional sheet-structured LLZO. This dimensional change creates continuous pathways for lithium ion conduction and provides broader surfaces for dendrite inhibition, simultaneously improving ionic conductivity and dendrite resistance while preserving electrochemical 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 Al-doped sheet LLZO composite solid-state electrolyte exhibits higher ionic conductivity and effective inhibition of lithium dendrites due to the continuous ceramic plane provided by the sheet LLZO, enhancing both mechanical properties and lithium ion conduction.
Implementation Method 1
the sheet LLZO provides a fast conduction channel for lithium ions
Data Source
AI summary
A preparation of solid-state electrolytes, in particular to an Al-doped sheet LLZO composite solid-state electrolyte and a preparation method and application thereof. The composite solid-state electrolyte includes Al ions, an LLZO solid-state electrolyte and a polymer substrate. The Al is doped in the LLZO solid-state electrolyte in a sheet structure, and the LLZO solid-state electrolyte is dispersed in the polymer substrate. The composite solid-state electrolyte has good flexibility, and has higher ionic conductivity than the granular doped composite solid-state electrolyte since the sheet LLZO provides a fast conduction channel for lithium ions. In addition, the preparation method is simple, suitable for large-scale production, and environmentally friendly since no toxic solvent is used in the preparation process.