Solid-State Battery Electrode Composite Design
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Solution Overview
Problem
Solid-state lithium-ion batteries face challenges in increasing lithium-ion transport and conductivity to enhance energy density and rate capacity, particularly due to restricted mobility of lithium ions and limitations in cathode loading and particle size distribution.
Innovation Solution
The method involves forming an electrode-electrolyte composite using a cathode active material, a lithiated ionomer, and an electrically conductive additive, with an electrolyte composition of lithiated perfluorosulfonic acid and solvent, applied to form an overlayer, optimizing the interface and improving durability and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If cathode loading is increased to enhance energy density, then energy density is improved, but lithium-ion transport and conductivity deteriorate
Solution Approach 1:
The patent applies local quality by creating distinct regions within the cathode electrode with different properties. The electrode includes a first region with larger active material particles and a second region with smaller active material particles. This spatial differentiation of particle sizes optimizes both lithium-ion transport (in the second region with smaller particles) and capacity (in the first region with larger particles), resolving the contradiction between cathode loading and lithium-ion transport.
2Reliability
If particle size of active material is reduced to improve lithium-ion transport, then conductivity is improved, but energy density deteriorates
Solution Approach 1:
The patent segments the cathode electrode into multiple regions with different particle size distributions. The first region contains larger particles (5-10 micrometers) that provide high capacity, while the second region contains smaller particles (1-3 micrometers) that facilitate lithium-ion transport. This segmentation allows the electrode to simultaneously achieve good conductivity and high energy density by distributing different particle sizes in different spatial locations.
3Reliability
If interface between electrode and electrolyte is minimized to reduce resistance, then lithium-ion transport is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-forming the electrode structure with optimized particle size distribution and regional differentiation before assembly into the battery. The cathode electrode is manufactured with the desired multi-region structure and particle size distribution already in place, which simplifies the overall manufacturing process while ensuring optimal lithium-ion transport properties at the electrode-electrolyte interface.
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 increases lithium-ion transport and conductivity, enhancing the rate capacity and operational integrity of solid-state batteries while maintaining stability and durability.
Implementation Method 1
increases lithium-ion transport and conductivity
Implementation Method 2
the electrode composition includes a cathode active material, a lithiated ionomer
Data Source
AI summary
Methods of making an electrolyte for a solid-state battery can include dissolving a lithiated perfluorosulfonic acid in a solvent to form a mixture, stirring the mixture using shear mixing, and heating the mixture to form an electrolyte gel. Methods of making a cathode electrode for a solid-state battery include forming an electrode composition including active materials, stirring the mixture using sheer mixing to reduce particle size and to form an ink, coating the ink on aluminum foil using one of doctor blade, micro gravure, and slot-die, and drying. The electrolyte is applied as an overlayer on the electrode.