Solid Electrolyte Using Lithium Ion Conductive Glass-Ceramics
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Solution Overview
Problem
Lithium ion secondary batteries with polymer solid electrolytes face issues of reduced mechanical strength, lithium ion conductivity, and poor heat resistance, leading to short-circuits and limited temperature range usability.
Innovation Solution
Incorporating lithium ion conductive glass-ceramics with specific compositions into the solid electrolyte and electrodes to enhance mechanical strength, ion conductivity, and thermal stability, eliminating organic substances and electrolytic solutions for improved safety and broad temperature range functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the polymer electrolyte is reduced to improve lithium ion conductivity, then the lithium ion conductivity is improved, but the mechanical strength is reduced causing the electrolyte to break or form holes
Solution Approach 1:
The patent uses a composite structure consisting of a porous polymer matrix combined with inorganic oxide particles (alumina, silica, lithium aluminate). This composite approach allows the electrolyte to maintain adequate thickness for mechanical strength while the porous structure and inorganic additives preserve lithium ion conductivity pathways.
Solution Approach 2:
The patent employs a porous polymer electrolyte structure where the porous matrix provides mechanical integrity and structural stability, while the pores serve as pathways for lithium ion transport. This porous architecture enables the electrolyte to maintain both mechanical strength and high lithium ion conductivity without requiring extreme thinning.
2Strength
If inorganic oxide such as alumina is added to increase mechanical strength, then the mechanical strength is improved, but lithium ion conductivity is significantly reduced
Solution Approach 1:
The patent uses a porous polymer matrix that provides continuous pathways for lithium ion transport. The porosity ensures that even with inorganic oxide particles present, lithium ions can move through the electrolyte effectively, maintaining conductivity while the inorganic particles provide mechanical reinforcement.
Solution Approach 2:
The inorganic oxide particles are distributed within the porous polymer matrix rather than forming a continuous dense phase. This local distribution allows regions of the electrolyte to maintain high lithium ion conductivity while other regions provide mechanical strength, achieving both properties simultaneously through spatial differentiation of functions.
3Strength
If inorganic oxide is added to the electrolyte to improve mechanical strength, then the mechanical strength is improved, but the charging-discharging characteristic deteriorates due to electrolyte reaction with inorganic oxide
Solution Approach 1:
The porous polymer matrix acts as an intermediary between the lithium ions and the inorganic oxide particles. The polymer structure provides a stable chemical environment that prevents direct harmful reactions between the electrolyte components and inorganic oxide, while still allowing lithium ion transport. This intermediary role of the polymer matrix protects against degradation and maintains stable charging-discharging characteristics.
4Ease of manufacture
If polymer electrolyte is used to simplify battery configuration, then the ease of manufacture is improved, but heat resistance is poor and the battery cannot be used over a broad temperature range
Solution Approach 1:
The patent creates a composite electrolyte system combining polymer and inorganic oxide components. The inorganic oxide particles (alumina, silica, lithium aluminate) provide thermal stability and heat resistance to the polymer matrix, enabling the battery to operate over a broader temperature range while maintaining the manufacturing advantages of polymer-based electrolytes.
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 solution results in a high-capacity, stable, and heat-resistant all-solid-state lithium ion secondary battery with excellent charging-discharging characteristics, capable of long-term use across a wide temperature range.
Implementation Method 1
comprising an inorganic substance comprising a lithium ion conductive crystalline... lithium ion conductivity... ion conduction
Data Source
AI summary
An all solid type lithium ion secondary battery which has high heat resistance and can be used over a broad temperature range, has a high battery capacity and an excellent charging-discharging characteristic, and can be used stably for a long period of time includes an inorganic substance including a lithium ion conductive crystalline and is substantially free of an organic substance and an electrolytic solution. The inorganic substance comprising a lithium ion conductive crystalline preferably is lithium ion conductive glass-ceramics.