All-Solid-State Battery Electrode Coating for Resistance Stability
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Solution Overview
Problem
All-solid state batteries experience an increase in resistance over long-term use due to the aggregation of active material particles, which disrupts ion conduction paths, leading to potential breaks and accelerated resistance growth.
Innovation Solution
The use of imidazoline-based compounds as dispersing agents for fluoride solid electrolytes in composite particles, which enhances dispersibility and reduces the likelihood of particle aggregation, combined with sulfide solid electrolytes for high ion conductivity, while maintaining a controlled amount of imidazoline-based compounds to avoid insulating effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dispersing agent is added to improve the dispersibility of active material particles, then particle aggregation is reduced and ion conduction paths are maintained, but the resistance increase rate may increase due to the insulating properties of the dispersing agent
Solution Approach 1:
The patent optimizes the content of the imidazoline-based compound within a specific range (0.01-0.5 parts by mass per 100 parts by mass of composite particles). This parameter control ensures sufficient dispersing effect to prevent particle aggregation while limiting the insulating effect that would increase resistance. The precise quantification of the dispersing agent content resolves the contradiction between maintaining dispersibility and minimizing resistance increase.
Solution Approach 2:
The imidazoline-based compound acts as an intermediary substance that mediates between the composite particles and the solid electrolyte. It provides a balanced effect: strong enough to prevent particle aggregation and maintain ion conduction paths, but controlled in amount to avoid excessive insulating properties. This intermediary role allows the system to achieve both good dispersibility and acceptable resistance stability.
2Stability of the object's composition
If the content of imidazoline-based compound is increased to enhance dispersing effect, then particle aggregation is further suppressed, but resistance increase rate increases due to insulating properties
Solution Approach 1:
The patent establishes an optimal parameter range for the imidazoline-based compound content (0.01-0.5 parts by mass per 100 parts by mass of composite particles). Within this range, the dispersing effect is sufficient to maintain particle dispersion stability while the insulating effect remains controlled. This parameter optimization directly resolves the contradiction between enhancing dispersibility and maintaining resistance 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
This approach effectively reduces the rate of resistance increase in all-solid state batteries by maintaining high dispersibility and ion conductivity, thereby extending battery performance and lifespan.
Implementation Method 1
the IM compound can act as a dispersing agent for SE. According to the novel findings of the present disclosure, the IM compound can impart high dispersibility, in particular, to the fluoride SE
Implementation Method 2
The coating layer contains a fluoride solid electrolyte. the fluoride SE tends to have a small increase in reaction resistance associated with long-term use
Implementation Method 3
The sulfide SE can form an ion conduction path in the electrode. The sulfide SE can exhibit high ion conductivity
Data Source
Figure 1
AI summary
An electrode for an all-solid state battery contains composite particles of 100 parts by mass and an imidazoline-based compound of more than 0 parts by mass and 0.3 parts by mass or less. The composite particle includes a core particle and a coating layer. The coating layer covers at least a part of a surface of the core particle. The core particle contains an active material. The coating layer contains a fluoride solid electrolyte.