Stacked Solid-State Battery Laminate for Higher Capacity Density
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Solution Overview
Problem
Existing all-solid-state batteries face challenges in increasing capacity while maintaining a constant volume, which is crucial for enhancing energy density and safety.
Innovation Solution
The design includes a laminate structure with alternating solid electrolyte, anode, and cathode layers, surrounded by insulating margin members, and external electrodes that extend to cover these margins, reducing the overall volume of the insulating material to maximize capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery volume is kept constant, then safety and energy density are improved, but the capacity cannot be increased sufficiently
Solution Approach 1:
The patent transitions from conventional planar electrode arrangements to a three-dimensional stacked laminate structure with alternating anode, solid electrolyte, and cathode layers. This vertical stacking in the third dimension maximizes the utilization of battery volume, allowing capacity increase without proportional volume increase, thus improving energy density while maintaining safety.
Solution Approach 2:
The patent employs composite material structures including alternating layers of different electrode materials and solid electrolytes, combining materials with complementary properties to achieve both high capacity and high safety. The solid electrolyte layers provide safety by eliminating flammable liquids while enabling high ionic conductivity for enhanced capacity.
2Reliability
If solid electrolyte layers are used instead of liquid electrolytes, then safety is improved by reducing fire risk, but energy density and capacity are reduced
Solution Approach 1:
The patent optimizes parameters of the solid electrolyte layers including thickness, composition, and density to achieve high ionic conductivity comparable to or exceeding liquid electrolytes. By controlling these parameters, the solid electrolyte enables high capacity while maintaining the safety advantages of non-flammable materials.
Solution Approach 2:
The patent creates local optimization at the interface between solid electrolyte and electrode layers, ensuring intimate contact and minimized interfacial resistance. This local quality enhancement at critical interfaces compensates for the generally lower ionic conductivity of solids, enabling high overall capacity while maintaining safety throughout the battery structure.
Data Source
AI summary
A disclosed all-solid-state battery may include a laminate that has a first surface and a second surface facing each other in a first direction, a third surface and a fourth surface face each other in a second direction and coupling the first surface and the second surface, and a fifth surface and a sixth surface facing each other in a third direction and coupling the first surface and the second surface, and includes solid electrolyte layers, and anode layers and cathode layers that are alternately stacked in the third direction with the solid electrolyte layers interposed therebetween, and a margin member that is disposed on the third surface, the fourth surface, the fifth surface, and the sixth surface of the laminate.