Composite Electrode Particles With Outer Electrolyte Distribution
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Solution Overview
Problem
Conventional methods for producing composite particles for all-solid-state secondary battery electrodes face challenges in improving output characteristics due to degradation of inorganic solid electrolytes caused by moisture during granulation.
Innovation Solution
The method involves externally adding an inorganic solid electrolyte to base particles obtained through granulation of a slurry composition containing an electrode active material and a binder, ensuring the inorganic solid electrolyte is distributed more in the outer part of the composite particles, and setting the volume-average particle diameter within a specific range to prevent moisture-induced degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic solid electrolyte is included in slurry composition during granulation, then electrode mixed material layer can be formed, but inorganic solid electrolyte degrades due to moisture
Solution Approach 1:
The inorganic solid electrolyte is extracted from the slurry composition and added externally after granulation. This separates the electrolyte from the moisture-containing slurry environment, preventing degradation while still allowing it to be incorporated into the electrode mixed material layer in the desired amount.
Solution Approach 2:
The granulation of electrode active material and binder is performed first to create base particles before adding the inorganic solid electrolyte. This preliminary action ensures the structure is established before introducing the moisture-sensitive electrolyte, preventing its degradation.
2Productivity
If inorganic solid electrolyte is uniformly distributed throughout composite particles, then electrode performance may be compromised, but outer part distribution improves output characteristics
Solution Approach 1:
The inorganic solid electrolyte is specifically distributed to the outer part of the composite particles rather than uniformly throughout. This local concentration in the outer region optimizes output characteristics while maintaining acceptable overall performance.
Solution Approach 2:
The electrolyte distribution transitions from a uniform three-dimensional distribution to a concentrated two-dimensional outer layer distribution. This dimensional change in distribution pattern enables improved output characteristics through enhanced surface contact and ion transport pathways.
Data Source
AI summary
Provided are composite particles for an all-solid-state secondary battery electrode with which it is possible to form an electrode for an all-solid-state secondary battery that can cause an all-solid-state secondary battery to display excellent output characteristics, and a method of producing these composite particles. The composite particles for an all-solid-state secondary battery electrode contain an electrode active material, a binder, and an inorganic solid electrolyte that is distributed more in an outer part than in an inner part, and have a volume-average particle diameter of not less than 5 µm and not more than 90 µm. The method of producing the composite particles for an all-solid-state secondary battery electrode includes granulating a slurry composition containing an electrode active material and a binder to obtain base particles and externally adding an inorganic solid electrolyte to the base particles.