All-Solid-State Battery Electrolyte for Stable Interface Conductivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current all-solid-state batteries face issues of low efficiency due to poor contact between electrode layers and solid electrolyte layers, low conductivity, and adverse reactions during charging and discharging, primarily due to the use of incompatible materials and low chemical stability.
Innovation Solution
The use of phosphates with a NASICON type structure in the positive, negative, and solid electrolyte layers, along with conductive materials like carbon black, enhances contact and reduces resistance, ensuring stable and efficient charging and discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid electrolytes are used to replace organic flammable electrolytes, then safety and environmental protection are improved, but contact between electrode layers and solid electrolyte layer deteriorates leading to low efficiency
Solution Approach 1:
The patent applies local quality by creating a dual-phase structure within the solid electrolyte layer, where crystalline regions provide stable ionic conductivity while amorphous regions enhance interfacial contact. This localized differentiation of material properties within the solid electrolyte resolves the contradiction between maintaining safety and improving charging/discharging efficiency.
Solution Approach 2:
The patent employs composite materials by combining crystalline and amorphous phases in the solid electrolyte layer. This composite structure leverages the advantages of both phases: crystalline regions ensure chemical stability and ionic conductivity, while amorphous regions improve contact with electrode layers, thereby resolving the efficiency problem while maintaining safety.
2Reliability
If solid electrolytes are used to replace organic flammable electrolytes, then safety is improved, but conductivity of electrodes deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the thermal processing conditions to achieve a specific crystalline phase composition and amorphous content in the solid electrolyte. By adjusting parameters such as heating temperature, holding time, and cooling rate, the patent optimizes the balance between ionic conductivity and interfacial contact, resolving the contradiction between safety and conductivity.
3Ease of manufacture
If conventional solid electrolyte materials are used, then manufacturing is simplified, but chemical stability during charging and discharging deteriorates leading to adverse reactions
Solution Approach 1:
The patent employs composite materials by combining crystalline and amorphous phases in the solid electrolyte layer. This composite structure leverages the advantages of both phases: crystalline regions ensure chemical stability and ionic conductivity, while amorphous regions improve contact with electrode layers, thereby resolving the efficiency problem while maintaining safety.
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 significantly improves battery performance by strengthening interfacial contacts, reducing resistance, and preventing adverse reactions, resulting in safer, more stable, and higher capacity batteries.
Implementation Method 1
a solid electrolyte layer containing phosphates having a NASICON type structure... significantly lower the resistance between interfaces in the battery
Data Source
AI summary
One embodiment of the present invention provides a secondary battery which is stable in a high-potential state and/or a high-temperature state. The secondary battery includes a positive electrode and a negative electrode, and either or both of the positive electrode and the negative electrode contains an active material and a composite compound having a crystal structure. The composite compound is used as an adhesive. In addition, the composite compound may be used as an electrolyte. The composite compound having a crystalline structure typically comprises a molecular crystal. In addition, the composite compound having a crystal structure can be obtained by mixing the first compound and the second compound while being heated at a temperature equal to or higher than the temperature at which the mixture melts.