Electrode Base Material Layout for Stable Solid-State Ion Conduction
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Solution Overview
Problem
All-solid-state batteries face issues with disconnected conduction paths due to volume variation of active material particles during ion insertion and extraction, leading to deterioration and reduced cycle characteristics, and existing mitigation methods hinder ionic conductivity.
Innovation Solution
A configuration is provided where specific electrolyte particles are predominantly distributed in the electrode base material to form uniform dense regions on one side and void regions on the other, ensuring sufficient contact between active material and electrolyte, maintaining ionic conductivity while mitigating volume variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If agglomerates of carbon particles having voids are formed at the interfaces between ceramic crystal particles to mitigate volume variation, then the mitigation of volume variation influence is improved, but ionic conduction is hindered resulting in reduction of output
Solution Approach 1:
The patent utilizes porous carbon particles with controlled void ratios (5-50%) to create mitigation units that accommodate volume variation of active material particles. The porous structure provides buffering capacity while maintaining sufficient contact for ionic conduction, resolving the contradiction between volume variation mitigation and ionic conduction performance.
Solution Approach 2:
The patent changes the key parameter of carbon particle void ratio to an optimal range (5-50%) and controls the ratio of mitigation units to active material particles (1:1 to 1:10). This parameter optimization ensures that the carbon particles can buffer volume variation while maintaining adequate contact for ion transport, thus improving cycle characteristics without significantly reducing output.
2Stability of the object's composition
If the ratio of agglomerates to ceramic crystal particles is increased to provide uniform mitigation portions, then the uniformity of mitigation is improved, but ionic conduction is hindered resulting in reduction of output
Solution Approach 1:
The patent optimizes the ratio of mitigation units to active material particles within a specific range (1:1 to 1:10) to achieve uniform distribution of mitigation portions throughout the electrode. This controlled ratio ensures uniform volume variation compensation while maintaining sufficient active material content for high output performance.
3Reliability
If carbon particles with voids are used to mitigate volume variation, then cycle characteristics are improved, but the conduction paths between electrodes and collector become disconnected
Solution Approach 1:
The patent employs porous carbon particles that maintain structural connectivity while providing internal void space for volume variation buffering. The porous structure allows continuous conduction paths to be maintained between electrodes and collector, preventing disconnection while still achieving improved cycle characteristics through volume variation mitigation.
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
This configuration enhances ionic conductivity and suppresses output reduction in secondary batteries by facilitating uniform ion conduction despite volume variation, improving cycle characteristics.
Implementation Method 1
conduction paths within the electrodes, especially between the electrodes and the collector, and between the electrodes and the electrolyte are likely to be disconnected
Data Source
AI summary
Provided is a material sheet comprising a resin base material and a particle layer comprising an active material particle and a solid electrolyte particle, an average circle-equivalent diameters of the active material particles and the solid electrolyte particles satisfy specific relationship, when, among the solid electrolyte particles, particles exceeding a specific size are defined as the first solid electrolyte particles, and particles equal to or less than a specific size are defined as the second solid electrolyte particles, the active material particles and the first solid electrolyte particles are arranged adjacently, and in cross-section observation of the particle layer, at least 80 number % of the second solid electrolyte particle is predominantly distributed on a side of the particle layer in contact with the resin base material or on a side opposite to the resin base material relative to a reference line.