Polymeric Solid Electrolyte Swelling for All-Solid-State Battery Contact
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Solution Overview
Problem
Lithium secondary batteries using solid electrolytes face challenges with low ion conductivity, degradation of output characteristics at low temperatures, and increased interfacial resistance due to insufficient contact between electrode active material particles and polymeric solid electrolytes, resulting in lower capacity and energy density compared to liquid electrolyte batteries.
Innovation Solution
An all solid-state battery design with a polymeric solid electrolyte that undergoes volumetric swelling through solvent annealing, increasing the contact area between electrode active material particles and the electrolyte, and reducing porosity to enhance lithium ion transportability and capacity realization.
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 polymeric solid electrolyte, then contact area increases, but active material particles may be cracked to generate defects
Solution Approach 1:
The invention changes the physical state of the polymeric solid electrolyte from a rigid solid to a swollen gel-like state by introducing a swelling agent. This parameter change allows the electrolyte to expand and fill gaps between particles, increasing contact area without applying severe compression that would crack the active material particles.
Solution Approach 2:
The swelling agent acts as an intermediary substance that facilitates contact between the active material particles and polymeric solid electrolyte. It swells the electrolyte matrix, enabling it to penetrate and fill gaps between particles, thereby increasing interfacial contact area without mechanical compression.
2Reliability
If polymeric solid electrolyte is used to ensure safety, then safety improves, but ion conductivity decreases compared to liquid electrolyte
Solution Approach 1:
The invention creates a composite material system combining polymeric solid electrolyte with a swelling agent. This composite structure maintains the safety advantages of solid electrolytes while the swelling agent creates a more open, liquid-like environment that enhances ion conductivity, effectively combining benefits of both solid and liquid electrolytes.
Solution Approach 2:
The invention changes the physical parameters of the polymeric solid electrolyte by introducing a swelling agent that increases free volume and creates a more flexible, gel-like matrix. This parameter change enables faster ion transport while maintaining the solid-state safety profile.
3Ease of manufacture
If polymeric solid electrolyte is distributed without contact with electrode active material, then manufacturing is simplified, but interfacial resistance increases
Solution Approach 1:
The swelling agent serves as an intermediary that actively promotes contact between the polymeric solid electrolyte and electrode active material. As the swelling agent expands the electrolyte matrix, it drives the electrolyte into contact with active material particles, reducing interfacial resistance while maintaining manufacturing simplicity.
Solution Approach 2:
The invention introduces dynamic behavior to the electrolyte distribution process. The swelling agent creates a time-dependent swelling process that progressively increases contact between electrolyte and active material, transforming a static distribution problem into a dynamic self-organizing process.
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 increased contact area and reduced porosity improve ion conductivity and capacity, leading to enhanced battery performance by increasing reaction sites and reducing interfacial resistance during charge/discharge cycles.
Implementation Method 1
a polymeric solid electrolyte which undergoes volumetric swelling
Implementation Method 2
through solvent annealing
Implementation Method 3
enhance lithium ion transportability
Data Source
AI summary
The present disclosure relates to an all solid-state battery cell and a method for manufacturing the same. The gaps between the electrode active material particles forming the electrode active material layer are filled with a mixture of a polymeric solid electrolyte with a conductive material, and an organic solid electrolyte membrane is interposed between the positive electrode and the negative electrode. The method comprises a solvent annealing process to improve the contact between the electrode active material particles and the conductive material and to improve the contact between the electrode active material layer and the organic solid electrolyte membrane, thereby providing an all solid-state battery cell with improved ion conductivity and capacity realization.