Polymer Solid Electrolyte Electrode with Solvent Annealing Contact Gain
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Solution Overview
Problem
Lithium secondary batteries using solid electrolytes face challenges with lower ion conductivity, degradation of output characteristics at low temperatures, poor contact between active materials and electrolytes, and limited capacity due to lower active material content, which restricts the development of wide-voltage batteries.
Innovation Solution
An electrode for all solid-state batteries is developed with a polymeric solid electrolyte that undergoes volumetric swelling through solvent infiltration, incorporating oxidation- and reduction-improving additives, and a solvent annealing process to increase porosity and contact area between active material particles and electrolytes, enhancing electrochemical stability and energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If severe compression is carried out to increase contact area between active material particles and polymer electrolyte, then contact area is improved, but active material particles are cracked
Solution Approach 1:
The patent changes the physical state of the polymer electrolyte from solid to solvated state by introducing a solvent. This parameter change allows the electrolyte to become fluid and infiltrate between particles without requiring severe compression, thus maintaining particle integrity while achieving good contact area.
Solution Approach 2:
The solvent acts as an intermediary substance that facilitates contact between the active material particles and the polymer electrolyte. The solvent infiltrates the electrolyte and creates a solvated state that enables the electrolyte to reach and contact particles without direct mechanical compression.
2Reliability
If a solid electrolyte is used to ensure safety, then safety is improved, but ion conductivity decreases
Solution Approach 1:
The patent changes the physical state parameter of the electrolyte from solid to solvated by introducing a solvent. This parameter change increases ion conductivity while maintaining the safety benefits of a solid electrolyte structure, as the solvent-enhanced electrolyte remains contained within the solid matrix.
Solution Approach 2:
The patent creates a composite system combining solid polymer electrolyte with solvent and oxidation-/reduction-improving additives. This composite structure maintains the safety advantages of solid electrolytes while the solvent and additives enhance ion conductivity and electrochemical stability.
3Reliability
If a solid electrolyte is used to prevent leakage, then reliability is improved, but contact with active material deteriorates
Solution Approach 1:
The solvent acts as an intermediary that enables the solid electrolyte to achieve good contact with active material. The solvent infiltrates the electrolyte and facilitates its penetration between particles, improving contact area without compromising the solid electrolyte's leakage prevention capability.
Solution Approach 2:
The patent changes the electrolyte from a rigid solid state to a solvated state with improved flow characteristics. This parameter change allows the electrolyte to conform to and contact active material surfaces more effectively while remaining part of a solid-state battery structure.
4Quantity of substance
If active material content is increased to achieve high energy density, then energy density is improved, but contact with electrolyte becomes insufficient
Solution Approach 1:
The solvent serves as an intermediary that enables high active material content while maintaining sufficient electrolyte contact. The solvent-enhanced electrolyte can infiltrate and reach between densely packed particles, ensuring adequate contact area even with high active material loading for high energy density.
Solution Approach 2:
The patent changes the electrolyte's physical properties through solvent addition, transforming it from a rigid solid to a more compliant solvated state. This parameter change allows the electrolyte to adapt to high active material content configurations and maintain adequate contact area throughout the electrode structure.
5Stability of the object's composition
If a solid electrolyte is used to fix position, then stability is improved, but oxidation/reduction stability decreases
Solution Approach 1:
The patent creates a composite electrolyte system combining solid polymer matrix with solvent and oxidation-/reduction-improving additives. This composite structure maintains the position stability of the solid electrolyte while the solvent and additives enhance electrochemical stability by reducing oxidation and reduction reactions.
Solution Approach 2:
The patent changes the chemical composition parameters of the electrolyte by introducing solvent and oxidation-/reduction-improving additives. These parameter changes enhance electrochemical stability while the solid matrix structure maintains position 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 approach improves the capacity, output characteristics, and energy density of the battery by increasing the contact area and stability of the electrolyte with active materials, preventing deterioration and enhancing lithium ion transportability, thus overcoming limitations in existing solid electrolyte batteries.
Implementation Method 1
the polymeric solid electrolyte which undergoes volumetric swelling through solvent infiltration
Implementation Method 2
a solvent annealing process to increase porosity and contact area between active material particles and electrolytes
Data Source
AI summary
The present disclosure relates to an electrode for an all solid-state battery and a method for manufacturing the same. The electrode comprises an electrode active material layer, wherein the gaps between the electrode active material particles forming the electrode active material layer are filled with a mixture of a polymeric solid electrolyte, oxidation-/reduction-improving additive and a conductive material. The method for manufacturing the electrode comprises a solvent annealing process, and the dissociation degree and transportability of the oxidation-/reduction-improving additive are increased through the solvent annealing process, thereby improving the life characteristics of a battery.