Composite Cathode Preparation With Alcohol for Moisture-Sensitive Electrodes
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Solution Overview
Problem
High-nickel cathode materials and halide solid electrolytes in solid-state batteries are sensitive to moisture, which adversely affects the electrochemical performance of composite cathodes when traditional wet mixing methods are used with water as a solvent.
Innovation Solution
A composite cathode preparation method involving mixing a cathode material, solid electrolyte, and alcohol solvent to form a slurry, followed by heat treatment, which eliminates moisture sensitivity and enhances electrochemical performance by forming a uniform core-shell structure with minimal impurities, using alcohol as a solvent to prevent moisture-related issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If wet mixing with water as a solvent is used, then the composite cathode has high uniformity and is cost-effective, but the moisture adversely affects the halide solid electrolyte and high-nickel cathode material, reducing electrochemical performance
Solution Approach 1:
The patent changes the solvent parameter from water to alcohol (such as ethanol or isopropanol), which maintains the wet mixing advantages of cost-effectiveness and uniformity while eliminating the harmful moisture effects on the halide solid electrolyte and high-nickel cathode material, thereby improving electrochemical performance
Solution Approach 2:
The patent converts the potentially harmful effect of moisture sensitivity into a benefit by selecting an alcohol solvent that evaporates completely during heat treatment, leaving no residual moisture to degrade the materials, thus turning the constraint into an advantage for achieving both uniformity and high electrochemical performance
2Reliability
If traditional dry mixing is used, then moisture sensitivity is avoided, but the uniformity of solid and ease of control are reduced
Solution Approach 1:
The patent introduces an alcohol solvent as an intermediary medium that enables wet mixing benefits (uniformity, ease of control) while being compatible with moisture-sensitive materials, as the alcohol evaporates during heat treatment without leaving harmful residues, thus mediating between the conflicting requirements of mixing quality and moisture avoidance
3Ease of manufacture
If wet mixing with water is used, then cost-effectiveness is improved, but harmful moisture effects increase
Solution Approach 1:
The patent changes the solvent parameter from water to alcohol, maintaining the cost-effectiveness and ease of manufacture of wet mixing while eliminating the harmful moisture effects, as alcohol solvents like ethanol and isopropanol are volatile and do not leave residual moisture that would degrade the halide solid electrolyte and high-nickel cathode material
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 method results in a composite cathode with improved electrochemical performance, energy efficiency, cost-effectiveness, and environmental friendliness by reducing moisture sensitivity and impurities, while maintaining high uniformity and stability.
Implementation Method 1
a cathode material, a solid electrolyte, and an alcohol solvent are mixed to form a slurry
Implementation Method 2
the slurry is heat treated to form the composite cathode
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A composite cathode preparation method is provided. The composite cathode preparation method includes steps of: (a) providing a cathode material, a solid electrolyte, a conductive carbon, and an alcohol solvent, wherein the cathode material includes a plurality of first particles and has a composition of Li[NiaCobMncAld]O2, a+b+c+d=1, 0.8<a≤1, 0≤b<1, 0≤c<1, and 0≤d<1, wherein the solid electrolyte has a composition of Li3InClxFy, x+y≤6, 0≤x≤6, and 0≤y≤3; (b) mixing the cathode material, the solid electrolyte, the conductive carbon, and the alcohol solvent to form a first slurry; (c) mixing the first slurry and a binder to form a second slurry; and (d) subjecting the second slurry to a heat treatment and remove the alcohol solvent to form the composite cathode, wherein the composite cathode includes a plurality of second particles, each of the second particles includes one of the plurality of first particles and the solid electrolyte coated on the first particles.