Porous Oriented Cathode Structure for Low-Resistance Solid-State Batteries
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Solution Overview
Problem
All-solid lithium batteries with low-angle oriented positive electrode plates and specific solid electrolytes face issues of high battery resistance and poor high-rate performance, leading to reduced production yield.
Innovation Solution
Adjusting the porosity of the low-angle oriented positive electrode plates to 10-50% and filling 30% or more of the pores with a solid electrolyte having a melting point lower than the positive or negative electrode plates, ensuring strong interfacial contact and improved lithium ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low-angle oriented positive electrode plates are used, then stress at the interface with solid electrolyte is reduced, but battery resistance increases and high-rate performance deteriorates
Solution Approach 1:
The patent applies porous materials by controlling the porosity of the positive electrode plate to be 10-50%. The pores are filled with solid electrolyte to create efficient lithium ion conduction pathways, reducing battery resistance while maintaining the low-angle orientation structure for interface stability.
Solution Approach 2:
The patent changes the porosity parameter of the positive electrode plate from conventional low values to 10-50%, and controls the filling rate of solid electrolyte in pores to be 30% or more. These parameter changes optimize both interface stability and high-rate performance.
2Power
If porosity of positive electrode plate is increased to fill with solid electrolyte, then lithium ion conductivity improves, but packing density of active material decreases
Solution Approach 1:
The patent applies local quality by creating pores specifically within the positive electrode plate structure to be filled with solid electrolyte, while maintaining high packing density of active material in the remaining regions. The porosity is controlled at 10-50% to balance electrolyte filling with active material density.
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 configuration significantly reduces battery resistance, enhances high-rate performance, and increases production yield by ensuring effective penetration and contact of the solid electrolyte within the electrode plates.
Implementation Method 1
filling 30% or more of the pores with a solid electrolyte having a melting point lower than the positive or negative electrode plates, ensuring strong interfacial contact
Implementation Method 2
a solid electrolyte having a melting point lower than the melting point or pyrolytic temperature of the oriented positive electrode plate or the negative electrode plate
Data Source
AI summary
Provided is an all-solid lithium battery including: a low-angle oriented positive electrode plate that is a lithium complex oxide sintered plate having a porosity of 10 to 50%; a negative electrode plate containing Ti and capable of intercalating and deintercalating lithium ions at 0.4 V or higher (vs. Li/Li+); and a solid electrolyte having a melting point lower than the melting point or pyrolytic temperature of the oriented positive electrode plate or the negative electrode plate, wherein at least 30% of pores in the oriented positive electrode plate is filled with the solid electrolyte in an observation of a cross-section perpendicular to a main face of the oriented positive electrode plate.