Lithium Ion Conductive Solid Electrolyte Porous Hollow Microspheres
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing solid electrolytes for lithium batteries face challenges with low lithium ion conductivity, mechanical strength, and interface resistance, limiting their practical application and battery performance.
Innovation Solution
Sintering lithium ion conductive glass or crystalline ceramics into a thin, high-area greensheet form, followed by sintering and electrode attachment, to create a solid electrolyte with enhanced ion conductivity and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of polymer electrolyte is reduced to improve lithium ion conductivity, then lithium ion conductivity is improved, but mechanical strength is reduced causing the electrolyte to break or form holes
Solution Approach 1:
The patent uses a composite structure consisting of a polymer electrolyte layer and a porous hollow microsphere layer. The hollow microspheres serve as spacers to maintain the thickness and mechanical strength of the electrolyte while allowing lithium ion conduction through the porous structure, thus resolving the contradiction between thinning for conductivity and maintaining strength.
2Strength
If inorganic oxide such as alumina is added to increase mechanical strength, then mechanical strength is improved, but lithium ion conductivity is significantly reduced
Solution Approach 1:
The patent employs porous hollow microspheres instead of dense inorganic oxide particles. The porous structure of the microspheres allows lithium ions to pass through while the hollow structure provides mechanical support and spacing, avoiding the conductivity reduction caused by dense inorganic oxide additions.
3Reliability
If all solid components are used to improve safety by eliminating liquid electrolyte, then safety is improved, but interface resistance increases making high output difficult to achieve
Solution Approach 1:
The porous hollow microsphere structure provides pathways for lithium ion transport, reducing interface resistance between solid components. The porous structure facilitates ion movement while maintaining the all-solid configuration for safety, thus resolving the contradiction between safety and power output.
4Duration of action of stationary object
If repeated charging and discharging is performed to test battery durability, then long-term stability is improved, but the electrolyte reacts with inorganic oxide causing deterioration in charging-discharging characteristics
Solution Approach 1:
The porous hollow microspheres are chemically inert and structurally stable, preventing reactions with the electrolyte during repeated charging-discharging cycles. The porous structure maintains ion conductivity while the hollow spheres provide long-term structural stability, avoiding the deterioration caused by inorganic oxide reactions.
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 resulting solid electrolyte achieves higher battery output, capacity, and stable charging-discharging characteristics, with improved ion conductivity and mechanical strength, facilitating long-term use and industrial-scale production.
Implementation Method 1
sintering powder of lithium ion conductive glass or crystalline (ceramics or glass-ceramics) having a specific composition
Data Source
AI summary
A solid electrolyte suitable for use in all solid type lithium ion secondary battery is made by sintering a form, particularly a greensheet, comprising at least lithium ion conductive inorganic substance powder. The solid electrolyte has porosity of 20 vol % or over.