Solid Electrolyte Composition with Alicyclic Dispersion Medium
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Solution Overview
Problem
Existing lithium ion secondary batteries using organic electrolytic solutions face issues with liquid leakage, short circuits, and safety concerns due to overcharging or overdischarging, necessitating improved reliability and safety, which all-solid state batteries with inorganic solid electrolytes aim to address by enhancing safety and energy density.
Innovation Solution
A solid electrolyte composition comprising an inorganic solid electrolyte, a binder, and a dispersion medium with a specific alicyclic compound that improves dispersion stability and viscosity, leading to uniform layer thickness and increased battery voltage, while preventing short circuits in all-solid state secondary batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an organic electrolytic solution is used in lithium ion secondary batteries, then the battery can operate with good ion conductivity, but liquid leakage and safety issues occur due to overcharging or overdischarging
Solution Approach 1:
The patent transitions the electrolyte from liquid phase (organic electrolytic solution) to solid phase (inorganic solid electrolyte). This phase transition eliminates liquid leakage while maintaining ion conductivity, directly resolving the safety and harmful factor issues associated with organic electrolytes
2Reliability
If an inorganic solid electrolyte is used to improve safety and reliability, then liquid leakage is prevented, but manufacturing complexity increases due to the need for precise dispersion and layer formation
Solution Approach 1:
The patent introduces a dispersion medium as an intermediary substance to facilitate the uniform dispersion of inorganic solid electrolyte particles. This mediator enables simplified manufacturing by allowing straightforward slurry preparation and layer formation processes, reducing the complexity that would otherwise result from handling pure solid electrolyte materials
Solution Approach 2:
The patent controls particle size parameters of the inorganic solid electrolyte (1 μm to 100 μm range) and dispersion medium properties to optimize both safety performance and manufacturing ease. By adjusting these physical parameters, the patent achieves a balance between reliability improvement and manufacturing simplicity
3Reliability
If a solid electrolyte layer is formed with uniform thickness to improve battery performance, then ion conductivity increases, but the manufacturing precision requirements become more stringent
Solution Approach 1:
The dispersion medium acts as a processing aid that enables uniform layer formation through simple coating processes. By controlling the viscosity and evaporation characteristics of the dispersion medium, the patent achieves uniform layer thickness without requiring complex precision manufacturing equipment or processes
Solution Approach 2:
The patent applies a slightly excessive amount of dispersion medium during layer formation, then allows controlled evaporation to achieve the desired uniform thickness. This approach simplifies manufacturing by using a forgiving process margin rather than requiring precise single-pass coating
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 proposed solution results in a solid electrolyte composition that enhances ion conductivity and achieves a higher battery voltage with improved layer uniformity, effectively addressing safety and reliability concerns in all-solid state secondary batteries.
Implementation Method 1
a solid electrolyte composition comprising an inorganic solid electrolyte, a binder, and a dispersion medium, wherein the dispersion medium includes an alicyclic compound
Implementation Method 2
all-solid state secondary batteries in which an inorganic solid electrolyte is used instead of the organic electrolytic solution
Data Source
Figure 1~3
AI summary
Provided are a solid electrolyte composition containing an inorganic solid electrolyte having conductivity of ions of metals belonging to Group I or II of the periodic table, a binder, and a dispersion medium, in which the dispersion medium includes an alicyclic compound composed of a carbon atom, a hydrogen atom, and/or a halogen atom, and a boiling point of the alicyclic compound at 760 mmHg is 100°C or higher and 180°C or lower, a solid electrolyte-containing sheet, an all-solid state secondary battery, and methods for manufacturing a solid electrolyte-containing sheet and an all-solid state secondary battery.