Ceramic-Coated Battery Diaphragm for Transition Metal Ion Trapping
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Solution Overview
Problem
In high-voltage lithium-ion batteries, metal particles or transition metal ions precipitate on the negative electrode, leading to metal dendrites, internal short circuits, and impaired lithium ion insertion, affecting safety and performance.
Innovation Solution
A ceramic particle with a core-shell structure is coated with a modification layer, using substituted siloxane or nitrogen-containing heterocyclic compounds, to adsorb transition metal ions and prevent their precipitation on the negative electrode, improving safety and performance without increasing internal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If porous ceramic particles are used to adsorb transition metal ions, then metal ion adsorption is improved, but moisture content increases which adversely affects electrical performance
Solution Approach 1:
The patent applies local quality by coating only the surface of ceramic particles with a hydrophobic layer, rather than making the entire particle porous or hydrophilic. This localized modification allows the core ceramic particle to maintain its metal ion adsorption capability while the surface coating specifically addresses the moisture absorption issue, creating a functionally differentiated structure that resolves the contradiction between ion adsorption and moisture control.
Solution Approach 2:
The patent employs composite materials by combining ceramic particles with a hydrophobic coating layer. This composite structure integrates the metal ion adsorption properties of the ceramic core with the moisture-repellent characteristics of the hydrophobic coating, creating a material that simultaneously achieves both desired functions and eliminates the adverse effect of high moisture content on electrical performance.
2Ease of manufacture
If metal particles precipitate on the negative electrode, then battery assembly is simplified, but internal short circuit risk increases
Solution Approach 1:
The patent applies preliminary action by incorporating metal ion adsorption functionality into the diaphragm structure before battery assembly. The hydrophobic coating on ceramic particles is pre-applied to create metal ion-trapping sites within the diaphragm, which proactively capture metal ions as they migrate through the electrolyte, preventing their subsequent precipitation on the negative electrode and eliminating the need for additional protective layers or complex assembly procedures.
Solution Approach 2:
The patent uses an intermediary approach by introducing the hydrophobic-coated ceramic particles as a mediating element between the electrolyte and the negative electrode. These particles act as intermediate traps that capture metal ions in the electrolyte before they can reach and precipitate on the negative electrode surface, thereby preventing internal short circuits while maintaining the simplicity of the overall battery structure and assembly process.
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 modification layer effectively adsorbs transition metal ions, enhancing safety, rate, and cycle performance of the battery while maintaining low internal resistance, and also adsorbs trace HF, stabilizing the positive electrode and improving safety.
Implementation Method 1
the modification layer can adsorb metal ions existing in a battery system (such as transition metal ions precipitated from a positive electrode material, metal ions or metal particles incorporated in the battery system)
Implementation Method 2
a compound for forming a substituent is selected from a carboxyl-containing amine compound or a nitrogen-containing heterocyclic compound
Data Source
AI summary
A diaphragm and a high-voltage battery including the diaphragm. A modification layer is coated on a surface of an inorganic ceramic particle, the modification layer can adsorb transition metal ions precipitated from an electrode material, thereby preventing the transition metal ions from forming transition metal precipitates on a surface of a negative electrode and improving safety, rate performance and cycle performance of the battery. At the same time, since the modification layer is coated on the surface of the inorganic ceramic particle, thus it will not have a significant impact on an internal resistance of the battery, and thereby not reducing the rate, low temperature, and cycle performances of the battery.