Positive Electrode Mixture Sequencing for All-Solid-State Batteries
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Solution Overview
Problem
The existing methods for manufacturing positive electrodes for all-solid-state batteries face challenges in achieving uniform distribution of materials, leading to increased electrical resistance and reduced lithium ion conductivity, which in turn affects the battery's capacity and efficiency.
Innovation Solution
A method involving the sequential mixing of a positive electrode active material and a solid electrolyte in a dry state, followed by the addition of an additional solid electrolyte in a wet state, and finally incorporating a conductive agent in a wet state to enhance the contact interface and uniform distribution of materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid electrolyte is mixed with active material and conductive agent in a conventional slurry process, then the battery can be manufactured, but the interface formation between solid electrolyte and active material is difficult leading to increased electrical resistance
Solution Approach 1:
The mixing process is segmented into distinct stages: first mixing solid electrolyte with active material in a dry state to ensure good contact, then adding conductive agent in a separate wet mixing stage. This segmentation allows each component to be properly incorporated without interfering with interface formation between solid electrolyte and active material.
Solution Approach 2:
The solid electrolyte is preliminarily mixed with the active material in a dry state before adding the conductive agent and binder in wet state. This preliminary dry mixing ensures that the solid electrolyte and active material are in close contact from the beginning, facilitating better interface formation before the conductive agent is introduced.
2Reliability
If solid electrolyte is mixed in conventional slurry process, then the battery can be manufactured, but uniform distribution of materials is not achieved leading to reduced lithium ion conductivity
Solution Approach 1:
The mixing process is divided into two distinct stages: dry mixing of solid electrolyte with active material, followed by wet mixing with conductive agent and binder. This segmentation prevents premature aggregation and ensures uniform distribution of all components throughout the electrode mixture.
Solution Approach 2:
The mixing conditions are changed from a single wet slurry process to a two-stage process involving dry mixing followed by wet mixing. This parameter change in the mixing process enables better control over material distribution and achieves more uniform electrode composition.
3Quantity of substance
If conventional single-stage mixing is used, then the manufacturing process is simple, but contact interface between solid electrolyte, active material, and conductive agent is insufficient reducing battery capacity
Solution Approach 1:
The mixing process is segmented into two stages: dry mixing of solid electrolyte with active material, then wet mixing with conductive agent. This segmentation creates sufficient contact interface between all three components (solid electrolyte, active material, and conductive agent) which is necessary for achieving high battery capacity.
Solution Approach 2:
The solid electrolyte and active material are preliminarily mixed in dry state to establish good contact interface before adding conductive agent. This preliminary action ensures that the essential electrode material interface is formed first, maximizing the potential for high capacity.
Data Source
AI summary
Disclosed are a method of manufacturing a positive electrode mixture for all-solid-state batteries and a positive electrode mixture for all-solid-state batteries manufactured using the same, and more particularly a method of manufacturing a positive electrode mixture for all-solid-state batteries including mixing a positive electrode active material and a solid electrolyte with each other in a dry state, mixing the mixture with an additional solid electrolyte in a wet state, and adding a conductive agent and performing mixing in a wet state at the time of manufacturing the positive electrode mixture for all-solid-state batteries and a positive electrode mixture for all-solid-state batteries manufactured using the same.