Impregnated Electrode Active Substance for All-Solid Battery Ion Paths
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Solution Overview
Problem
Lithium ion batteries face challenges in improving ion conductivity and battery capacity due to voids in the electrode active substance, which inhibit ion conduction and affect overall battery performance.
Innovation Solution
The introduction of a polymer solid electrolyte impregnated into secondary particles within the electrode active substance, using a method involving supercritical fluids to enhance ion conductivity by creating an ion conduction path within the voids, thereby improving the electrode's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymer solid electrolyte is introduced into secondary particles to improve ion conductivity, then ion conduction is enhanced, but the structural complexity of the electrode active substance increases
Solution Approach 1:
The polymer solid electrolyte is impregnated inside the secondary particles, creating a nested structure where the electrolyte occupies the internal void spaces. This nested configuration enhances ion conductivity within the particle structure without significantly increasing external dimensional complexity
Solution Approach 2:
The secondary particles are designed with controlled porosity to accommodate the polymer solid electrolyte. The porous structure allows efficient impregnation of the electrolyte while maintaining a relatively simple overall particle morphology, resolving the contradiction between internal complexity for ion conduction and external simplicity
2Reliability
If supercritical fluid is used to impregnate polymer solid electrolyte into secondary particles, then ion conductivity is improved, but the manufacturing process complexity increases
Solution Approach 1:
The supercritical fluid process utilizes phase transition of the fluid (from supercritical to gaseous state upon depressurization) to achieve impregnation. This phase change mechanism enables automatic removal of the fluid after electrolyte delivery, simplifying the overall manufacturing process compared to methods requiring separate drying and purification steps
Solution Approach 2:
The supercritical fluid acts as an intermediary carrier that delivers the polymer solid electrolyte into the secondary particles. This intermediary approach allows controlled impregnation without direct contact between the electrolyte and processing equipment, simplifying manufacturing while achieving uniform distribution
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 results in an all-solid battery with enhanced ion conductivity, leading to higher battery capacity and improved charge/discharge characteristics, while preventing aggregation issues that could decrease ion conductivity.
Implementation Method 1
dissolving or dispersing the polymer solid electrolyte in a supercritical fluid to form a supercritical fluid mixture
Implementation Method 2
cooling and depressurizing the supercritical fluid mixture
Data Source
AI summary
A negative electrode active substance is used for a negative electrode layer of an all-solid battery and contains a plurality of secondary particles. The plurality of secondary particles contain impregnated particles which are secondary particles having a polymer solid electrolyte region impregnated with the polymer solid electrolyte therein and an active material region.