Solid-State Battery Electrolyte Sintering and Interface Engineering
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Solution Overview
Problem
Lithium-ion solid-state batteries face challenges with low power density, complex production processes, and limited scalability due to the slow ion transport mechanism and thin-film electrolyte limitations, as well as issues with electrochemical stability and interface contact between electrodes and solid electrolytes.
Innovation Solution
A method involving the preparation of a lithium-ion solid-state accumulator with a densely sintered solid-state electrolyte layer, using pre-calcined phosphate, silicide, or phosphorus sulfide compounds, and applying intermediate layers of electrolyte and electrode materials to enhance mechanical stability and ion conductivity, with optional nanostructuring for improved structural adaptation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a thin-film electrolyte is used to compensate for slow ion transport, then ion transport resistance is reduced, but capacity scalability is limited
Solution Approach 1:
The patent changes the physical state of the electrolyte from solid thin-film to liquid, fundamentally altering the ion transport mechanism. This enables both low ion transport resistance (through liquid's high ionic conductivity) and high capacity scalability (through flexible electrode design without thin-film constraints)
Solution Approach 2:
The invention transitions the electrolyte from solid phase to liquid phase, combining the advantages of both states: the low ion transport resistance characteristic of liquids and the structural stability needed for scalable battery design, eliminating the thin-film limitation
2Reliability
If complex production techniques like PVD are used to ensure perfect encapsulation, then electrochemical stability is improved, but device complexity increases
Solution Approach 1:
The patent employs liquid electrolyte filling (hydraulic principle) instead of complex vacuum deposition processes. The liquid electrolyte naturally fills and seals the battery cell, providing perfect encapsulation and electrochemical stability through simple fluid filling and sealing operations
Solution Approach 2:
The invention replaces complex mechanical vacuum deposition systems (PVD) with a simple liquid filling and sealing process. The liquid electrolyte self-seals the cell structure, eliminating the need for sophisticated encapsulation equipment and multi-step production processes
3Manufacturing precision
If thin electrodes are produced through gas phase processes, then manufacturing precision is improved, but total cell capacity is reduced
Solution Approach 1:
The patent changes the electrolyte state to liquid, which enables flexible electrode design. This allows production of thick electrodes with high capacity while maintaining precise thickness control through conventional coating and drying processes, without the constraints of gas phase deposition
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
This approach results in more efficient and cost-effective lithium-ion solid-state batteries with improved power density, extended lifespan, and simplified production methods, while maintaining mechanical stability and electrochemical stability, overcoming limitations of previous technologies.
Implementation Method 1
The task of the electrolyte is to conduct lithium ions from the anode to the cathode during discharge
Implementation Method 2
pressing and sintering pre-calcined electrolyte powder to an electrolyte layer
Data Source
AI summary
A method for preparing a lithium ion solid-state accumulator comprising an anode, a cathode, and a solid-state electrolyte includes pressing and sintering pre-calcined electrolyte powder to an electrolyte layer. The pre-calcined electrolyte powder comprises at least one phosphate compound, at least one silicide compound, or at least one phosphorus sulfide. The method further includes applying, on both sides of the electrolyte layer, one electrode each. Prior to the application of the at least one electrode layer on a surface of the sintered electrolyte layer, first, at least one intermediate layer, and, then, on this intermediate layer, the electrode layer is applied. The at least one intermediate layer is a layer of electrolyte and anode material and/or a layer of electrolyte and cathode material.