Solid-State Battery Cathode Laminate for Crack-Resistant Ion Conduction
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Solution Overview
Problem
Conventional positive electrodes in batteries, particularly those containing solid electrolytes, are prone to microcracks, which affect their performance.
Innovation Solution
A battery design incorporating a laminate structure with a positive electrode layer and a solid electrolyte layer, where the solid electrolyte material contains an alkali metal element, a metal or metalloid element, and a halogen element, with specific compositional ratios and properties to minimize microcracks and enhance conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional positive electrode including a solid electrolyte is used, then ion conductivity is improved, but microcracks are likely to generate in the positive electrode
Solution Approach 1:
The invention changes the chemical composition parameters of the solid electrolyte material by incorporating specific halogen elements (F, Cl, Br, I) along with alkali metals and metal elements. This compositional parameter change achieves high ion conductivity while preventing microcrack formation, as evidenced by the resistance values of 1000 Ω or less and the structural integrity maintained in the laminates.
Solution Approach 2:
The invention creates a composite solid electrolyte material combining multiple element types (alkali metal, metal element, halogen element) in specific ratios. This composite approach, represented by the general formula AαMβZγDζOη, achieves both high ion conductivity and structural stability, resolving the contradiction between conductivity improvement and crack prevention.
2Reliability
If the solid electrolyte material contains specific compositional ratios, then resistance is reduced to 1000 Ω or less, but the compositional complexity increases
Solution Approach 1:
The invention establishes specific parameter ranges for compositional ratios (1.6 ≤ α ≤ 3.5, 0.5 ≤ β ≤ 2.0, 3.0 ≤ γ ≤ 5.5, 0.005 ≤ ζ ≤ 0.5) that simultaneously achieve low resistance (1000 Ω or less) and simplify the formulation process. These defined parameters provide a clear guidance for material preparation while ensuring optimal performance.
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 battery design achieves reduced resistance and improved ion conductivity, minimizing microcracks and ensuring effective charge and discharge performance.
Implementation Method 1
a solid electrolyte material contains an alkali metal element, a metal element or metalloid element except the alkali metal element, and a halogen element... a resistance value is 1000 Ω or less
Data Source
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AI summary
A battery including a laminate composed of a positive electrode layer and a solid electrolyte layer, in which the positive electrode layer contains a positive electrode active material and a solid electrolyte material, the solid electrolyte material contains an alkali metal element, a metal element or metalloid element except the alkali metal element, and a halogen element, and when the laminate is punched into a cylindrical shape having a diameter of 10 mm to prepare a test piece and the test piece is sandwiched between two SUS plates and subjected to impedance measurement, a resistance value is 1000 Ω or less.