Flame-Retardant Inactive Member for All-Solid Battery Layer Contact
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Solution Overview
Problem
All-solid secondary batteries with sulfide-based solid electrolytes face challenges in maintaining uniform contact between layers, leading to increased resistance and the risk of short circuits due to micro-defects and non-uniformity during manufacturing and charging/discharging processes.
Innovation Solution
Incorporation of a flame-retardant inactive member with a specific rectangular enclosure shape surrounding the cathode active material layer, which provides uniform compression and prevents cracking of the solid electrolyte layer, thereby reducing the likelihood of short circuits and improving energy density and cell stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte layer is used instead of liquid electrolyte, then safety is improved by eliminating flammable organic solvents, but manufacturing precision deteriorates due to micro-defects and non-uniformity during manufacturing and charging/discharging processes
Solution Approach 1:
The flame-retardant inactive member is designed with a rectangular enclosure shape that preliminarily defines and maintains the spatial relationship between the cathode active material layer and anode active material layer. This pre-structured framework ensures uniform contact between layers before charging/discharging processes begin, preventing micro-defects from forming during operation.
Solution Approach 2:
The inactive member's rectangular enclosure structure changes the physical parameters of the battery assembly by providing uniform compression force distribution. This parameter change maintains consistent pressure and contact between the solid electrolyte layer and electrode layers throughout charging/discharging cycles, eliminating non-uniformity issues.
2Manufacturing precision
If the flame-retardant inactive member with rectangular enclosure shape is added, then manufacturing precision is improved by maintaining uniform contact between layers, but device complexity increases
Solution Approach 1:
The flame-retardant inactive member serves multiple functions simultaneously: it provides structural support for uniform layer contact, acts as a flame-retardant safety component, and maintains spatial positioning of electrodes. This multi-functionality reduces the need for separate components, thereby not increasing overall device complexity despite the added rectangular enclosure structure.
Solution Approach 2:
The inactive member combines flame-retardant properties with structural functionality in a single composite component. This integration of multiple functions into one element achieves uniform layer contact without proportionally increasing device complexity, as the rectangular enclosure serves both structural and safety purposes.
3Reliability
If uniform compression is applied to maintain contact between layers, then reliability is improved by preventing short circuits, but device complexity increases due to additional structural components
Solution Approach 1:
The rectangular enclosure-shaped inactive member simultaneously provides uniform compression for reliable layer contact and serves as a flame-retardant protective component. This multi-functionality achieves short circuit prevention without requiring separate compression mechanisms, thereby not increasing device complexity.
Solution Approach 2:
The patent merges the compression function and flame-retardant protection function into a single rectangular enclosure-shaped inactive member. This consolidation achieves reliable short circuit prevention while minimizing the number of components, as one element performs multiple critical functions.
Data Source
AI summary
An all-solid secondary battery includes a cathode layer, an anode layer, and a solid electrolyte layer disposed between the cathode layer and the anode layer. The cathode layer includes a cathode active material layer and a flame-retardant inactive member located on and in contact with the solid electrolyte layer and has a rectangular enclosure shape surrounding side surfaces of the cathode active material layer, wherein the flame-retardant inactive member includes a pair of first side portions and a pair of second side portions connected to the first side portions, the first side portions having uncoated portion corresponding portions corresponding to a cathode uncoated portion of a cathode current collector and an anode uncoated portion of an anode current collector, respectively, and wherein a width of the uncoated portion corresponding portion of the first side portion is greater than a width of the remaining portion of the first side portion.