Composite Positive Electrode Plate With Halide Electrolyte Densification
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Solution Overview
Problem
Conventional lithium-ion batteries using flammable organic solvents as electrolytes pose safety risks, and all-solid-state lithium-ion batteries face challenges in matching electrode materials with solid-state electrolytes to reduce interface impedance and ensure stability, while also dealing with high costs and poor rate performance and cycle life.
Innovation Solution
A composite positive electrode plate is developed, comprising a positive electrode active material and a halide solid-state electrolyte with a chemical formula of Li2+aZr1−aFeaCl6−x−yBrxIy, where 0<a≤0.5, x=0 to 6, y=0 to 6, x+y≤6, and a compaction density of 2.8 g/cm3 to 3.4 g/cm3, which enhances the rate performance and cycle life of lithium-ion batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If commonly used solid-state electrolytes are used, then safety is improved, but cost increases and matching with positive electrode material deteriorates
Solution Approach 1:
The patent modifies parameters of solid-state electrolyte materials to achieve optimal performance and compatibility. By adjusting compositional parameters and processing conditions, the patent reduces costs while maintaining safety and improving matching with positive electrode materials.
2Productivity
If high compaction density is achieved in positive electrode plate, then rate performance and cycle life are improved, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes compaction density by adjusting manufacturing parameters such as pressing pressure, temperature, and material composition. These parameter changes enable achievement of high compaction density (improving rate performance and cycle life) through controlled manufacturing processes rather than complex device designs.
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 composite positive electrode plate improves the compaction density, ionic conductivity, and compatibility with high-voltage positive electrodes, effectively suppressing side reactions, enhancing interface stability, and inhibiting voltage decay, thereby improving the cycle life and performance of lithium-ion batteries.
Implementation Method 1
enhance the lithium-ion conduction ability of the composite positive electrode plate
Data Source
AI summary
The disclosure provides a composite positive electrode plate and a preparation method and applications thereof. The composite positive electrode plate at least includes a positive electrode active material and a halide solid-state electrolyte. A chemical formula of the halide solid-state electrolyte is Li2+aZr1−aFeaCl6−x−yBrxIy, where 0<a≤0.5, x=0 to 6, y=0 to 6, x+y≤6, and a compaction density of the composite positive electrode plate is 2.8 g/cm3 to 3.4 g/cm3. The composite positive electrode plate and the preparation method and applications thereof improve the compaction density of the positive electrode plate and thus enhance the rate performance and cycle life of the lithium-ion battery.