All-solid Battery Inactive Member for Contact Stability
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Solution Overview
Problem
All-solid secondary batteries face challenges in maintaining sufficient contact between the cathode and solid electrolyte layers, leading to increased resistance and the risk of short-circuits due to cracks in the solid electrolyte layer during charging and discharging, which affects their cycle characteristics.
Innovation Solution
Incorporating an inactive multilayer structure with an adhesive and support layer on the cathode side to enhance the contact between the cathode and solid electrolyte layers, reducing the likelihood of cracks and improving the battery's cycle characteristics by providing uniform pressure and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an all-solid secondary battery uses a solid electrolyte layer without additional support structures, then the device complexity is reduced, but the reliability deteriorates due to cracks and short-circuits in the solid electrolyte layer during charging and discharging
Solution Approach 1:
The patent applies composite materials by creating a multilayer structure consisting of a solid electrolyte layer and a support layer. The support layer is formed from the same solid electrolyte material but with different physical properties (porosity, density, or crystal structure) to provide mechanical strength while maintaining ionic conductivity. This composite approach prevents cracks in the solid electrolyte layer during battery operation, thereby improving reliability and cycle characteristics without significantly increasing device complexity
Solution Approach 2:
The patent segments the solid electrolyte functionality into two distinct layers: a functional solid electrolyte layer for ionic conduction and a separate support layer for mechanical strength. This segmentation allows each layer to be optimized independently - the solid electrolyte layer for electrochemical performance and the support layer for structural integrity - resolving the contradiction between simplicity and reliability
2Volume of stationary object
If the solid electrolyte layer is made thinner to reduce battery size, then the volume is reduced, but the harmful factors increase due to higher risk of cracks and short-circuits
Solution Approach 1:
By using a composite structure with a thin solid electrolyte layer combined with a support layer, the patent achieves reduced battery volume while maintaining safety. The support layer compensates for the reduced thickness of the solid electrolyte layer, preventing cracks and short-circuits even when the overall electrolyte thickness is minimized, thus allowing volume reduction without increasing harmful factors
3Reliability
If uniform pressure is applied to maintain contact between cathode and solid electrolyte, then the electrical conductivity is improved, but the stress on the solid electrolyte layer increases, potentially causing cracks
Solution Approach 1:
The composite structure with the support layer provides a solution where uniform pressure can be applied to maintain good contact between the cathode and solid electrolyte interface without causing cracks. The support layer acts as a stress-distributing element that prevents stress concentration in the solid electrolyte layer, allowing the battery to operate under optimal contact conditions while maintaining solid electrolyte integrity
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
The solution effectively reduces the occurrence of short-circuits and enhances the cycle characteristics of the all-solid secondary battery by maintaining stable contact and reducing interfacial resistance between the cathode and solid electrolyte layers.
Implementation Method 1
the multilayer structure includes an adhesive layer and a support layer
Implementation Method 2
an all-solid secondary battery utilizing a solid electrolyte instead of an electrolyte solution
Data Source
AI summary
An all-solid secondary battery includes: a cathode layer; an anode layer; a solid electrolyte layer disposed between the cathode layer and the anode layer; and an inactive member disposed on a thickness side of the cathode layer, wherein the cathode layer includes a cathode current collector and a cathode active material layer disposed on the cathode current collector, the anode layer includes an anode current collector and a first anode active material layer disposed on the anode current collector, the inactive member includes a multilayer structure, and the multilayer structure includes an adhesive layer and a support layer.