All-solid-state battery segmentation for power density
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Solution Overview
Problem
Existing all-solid-state batteries face challenges in increasing power density while maintaining a constant fastening force, as increasing electrode area leads to higher fastening force, which is problematic for battery performance.
Innovation Solution
The battery design involves stacking laminated bodies with facing anode or cathode layers in contact, using a base material that maintains a solid state and allows ion permeation, and employing a manufacturing method that includes forming insulating, electrolyte, and electrode layers, followed by folding to create a structure that extends electrode area without increasing fastening force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electrode area is extended to raise power density, then the power density is improved, but the fastening force increases
Solution Approach 1:
The battery is divided into multiple laminated bodies, each containing a subset of electrodes. By segmenting the battery structure, the electrode area is extended across multiple layers while the fastening force is distributed and maintained at constant levels through the stacking configuration
Solution Approach 2:
The battery transitions from a two-dimensional electrode arrangement to a three-dimensional stacked structure. Multiple laminated bodies are stacked in the vertical dimension, allowing electrode area extension without proportionally increasing the horizontal fastening force requirement
2Reliability
If a solid electrolyte layer is used instead of electrolytic solution, then safety is improved, but interface area between cathode active material and electrolyte decreases
Solution Approach 1:
The cathode mixture layer is formed as a composite material containing both cathode active material powder and solid electrolyte powder. This composite structure increases the interfacial contact area between the cathode active material and solid electrolyte, compensating for the reduced permeability characteristic of solid electrolytes while maintaining safety benefits
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 allows for enhanced power density without increasing fastening force, enabling efficient lithium ion travel and electron collection while maintaining structural integrity.
Implementation Method 1
a solid electrolyte layer (3) arranged between the cathode layer (1) and the anode layer (2)
Implementation Method 2
a base material that maintains a solid state and allows ion permeation
Data Source
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AI summary
The present invention provides an all-solid-state battery which is capable of raising power density of the battery and capable of inhibiting increase of fastening force, and also provides the manufacturing method thereof. The all-solid-state battery comprises a plurality of laminated bodies each of which comprises: a cathode layer; an anode layer; and a solid electrolyte layer sandwiched therebetween, when neighboring two laminated bodies optionally selected from the plurality of laminated bodies are defined as a first laminated body and a second laminated body, the plurality of laminated bodies being laminated such that the cathode layer of the first laminated body and the cathode layer of the second laminated body are in contact with each other, or such that the anode layer of the first laminated body and the anode layer of the second laminated body are in contact with each other, the solid electrolyte layer of the first laminated body and the solid electrolyte layer of the second laminated body being connected through an insulating layer, to a pair of side surface of laminated plurality of the laminated bodies, a first current collector which is connected with the cathode layer but not connected with the anode layer and a second current collector which is connected with the anode layer but not connected with the cathode layer being arranged respectively, a plurality of insulating layers connected to the solid electrolyte layers being arranged between the cathode layer and the second current collector and between the anode layer and the first current collector.