Solid State Battery SIDE Coating for Ion Diffusion
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Solution Overview
Problem
Thin film solid state batteries face issues with mechanical deformation and ion accessibility due to rigid structures and limited ion diffusion, leading to delamination and reduced performance, especially in 3D configurations.
Innovation Solution
The implementation of a surface-ion diffusion enhancement (SIDE) coating on both the anode and cathode, comprising dielectric, conductive, or solid electrolyte materials, enhances ion mobility by increasing the interfacial ion conduction, and using porous materials for electrodes and electrolytes to improve mechanical deformation tolerance and ion accessibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid structure is used in thin film solid state batteries, then mechanical strength is improved, but ion accessibility and ion diffusion are limited
Solution Approach 1:
The patent applies porous materials to the electrode and electrolyte structures, creating a 3D porous architecture that provides both mechanical integrity and enhanced ion diffusion pathways. The porous structure increases surface area and allows ions to access active materials more effectively while maintaining structural strength.
Solution Approach 2:
The patent transitions from planar 2D structures to 3D porous structures, adding a dimensional aspect that enables simultaneous achievement of mechanical strength and ion accessibility. The 3D architecture provides multiple diffusion pathways and increases the effective surface area for ion transport.
2Reliability
If a solid electrolyte matrix is used, then thermal safety is improved, but ion diffusion rates are limited compared to liquid electrolytes
Solution Approach 1:
The solid electrolyte is designed with a porous structure that creates additional ion diffusion pathways. The porosity allows ions to move through the solid electrolyte more efficiently by providing shortcuts and reducing diffusion distances, while maintaining the thermal safety benefits of solid electrolyte material.
Solution Approach 2:
The patent employs composite material structures combining solid electrolyte with porous frameworks, creating a hybrid architecture that leverages the thermal stability of solids while achieving enhanced ion diffusion characteristics through the porous network.
3Quantity of substance
If 3D configurations are used, then energy density is improved, but mechanical deformation and delamination issues worsen
Solution Approach 1:
The 3D porous configuration increases energy density by utilizing vertical space more effectively while the porous structure inherently accommodates mechanical deformation. The porous architecture flexes and expands with volume changes during charging/discharging, preventing delamination and maintaining mechanical integrity.
Solution Approach 2:
The patent creates a dynamic structure where the porous framework can adapt and flex in response to mechanical stresses and volume changes during battery operation. This dynamic capability allows the 3D structure to maintain integrity while accommodating the energy-dense configuration.
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 significantly boosts ion conductivity and battery performance by increasing accessible capacity, power, and lifespan while maintaining mechanical integrity, particularly in 3D structures.
Implementation Method 1
surface ion-diffusion enhancement coating... enhances ion mobility by increasing the interfacial ion conduction
Data Source
Figure 1~2
Figure 3
Figure 4a~4b
AI summary
A solid state battery cell comprising an anode, a cathode and a solid electrolyte matrix, wherein at least the anode or the cathode comprises a functional battery material (10) having pores and wherein an inner surface of the pores is coated with a first surface-ion diffusion enhancement (SIDE) coating (20) and wherein the solid electrolyte matrix comprises an electronically insulating matrix (30) for a solid electrolyte, the electronically insulating matrix having pores or passages and wherein an inner surface of the pores or the passages is coated with a second SIDE coating (40).