Electrode Protection Member for Solid-State Battery Step Insulation
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Solution Overview
Problem
Existing lithium all-solid-state batteries face challenges with internal short circuits and side reactions due to differences in electrode areas and the use of flammable liquid electrolytes, which can lead to safety issues and reduced performance.
Innovation Solution
An electrode protection member is developed, comprising a carbon-based tubular body functionalized with hydroxy groups and a composite resin layer made of a thermoset resin and an ultraviolet curing resin, which is applied to prevent resin penetration and enhance bonding with the electrodes and solid electrolyte layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glass or ceramics based on composite oxides are used as internal short-circuit protection materials, then internal short circuit prevention is improved, but cracks occur under pressurized conditions due to incomplete protection of the step formed by area difference between electrodes
Solution Approach 1:
The patent uses a composite material consisting of a lower structure (carbon-based body with hydroxy groups) and a composite resin part (thermoset resin + ultraviolet curing resin). This composite structure provides both protection against internal short circuits and resistance to cracking under pressure, resolving the contradiction between short circuit prevention and crack resistance.
2Reliability
If thermoset resin or ultraviolet curing resin is applied to the solid electrolyte layer, then electrode protection is improved, but the resin penetrates into the solid electrolyte layer causing side reactions or penetrates into the contact surface with the positive electrode
Solution Approach 1:
The lower structure with hydroxy groups acts as an intermediary layer between the composite resin part and the solid electrolyte layer. This intermediary structure prevents direct contact and penetration of the resin into the electrolyte, thereby preventing side reactions while maintaining electrode protection functionality.
3Use of energy by moving object
If the area of the negative electrode coated with solid electrolyte is made larger than the positive electrode area, then energy density is improved, but the risk of internal short circuit increases under high temperature and high pressure conditions
Solution Approach 1:
The patent segments the electrode structure by introducing a lower structure and composite resin part that divide the electrode assembly into distinct functional zones. This segmentation allows the negative electrode to have larger area for energy density while the protection structures prevent internal short circuits in the step region under high temperature and pressure.
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 electrode protection member effectively prevents resin penetration into the electrodes and solid electrolyte, suppresses side reactions, and ensures a firm bond, thereby enhancing the safety and performance of all-solid-state batteries by preventing internal short circuits and maintaining a high stack structure.
Implementation Method 1
a lower structure including a carbon-based tubular body whose surface is functionalized with a hydroxy group; and a composite resin part including a thermoset resin and an ultraviolet curing resin disposed on the lower structure
Implementation Method 2
a composite resin part including a thermoset resin and an ultraviolet curing resin disposed on the lower structure
Data Source
AI summary
Provided is an electrode protection member comprising a lower structure including a carbon-based tubular body whose surface is functionalized with a hydroxy group; and a composite resin part including a thermoset resin and an ultraviolet curing resin disposed on the lower structure, a manufacturing method of the electrode protection membrane, and an all-solid-state battery including the electrode protection member.