Fluorine-Substituted Titanium Oxide for Battery Stability
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Solution Overview
Problem
Titanium oxides with a monoclinic β-type structure for batteries face issues with hydroxyl groups causing decomposition of electrolytic solutions, leading to high-resistance coatings and reduced performance, particularly in high-current and charge/discharge cycles due to incomplete removal at low temperatures which alters the crystal structure.
Innovation Solution
Incorporating fluorine into the monoclinic β-type titanium composite oxide to substitute hydroxyl groups, thereby reducing reactivity with electrolytic solutions and improving high-current properties and charge/discharge cycle performance by forming a surface layer with high fluorine content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If low temperature treatment is applied to remove hydroxyl groups, then the crystal structure is preserved, but hydroxyl groups are not completely removed leading to electrolyte decomposition
Solution Approach 1:
The patent changes the chemical composition parameter by incorporating fluorine into the titanium oxide structure. This substitution of hydroxyl groups with fluorine atoms fundamentally alters the surface chemistry, preventing electrolyte decomposition while preserving the monoclinic β-type crystal structure. The fluorine content is controlled within specific ranges (0.1-10 wt%) to optimize both structural stability and electrochemical performance.
2Reliability
If fluorine is incorporated to substitute hydroxyl groups, then reactivity with electrolytic solution is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent merges the crystal structure formation and hydroxyl group removal steps into a single synthesis process. By using fluorine-containing starting materials and controlling the sintering atmosphere, the fluorine substitution occurs simultaneously with crystal structure development, eliminating the need for separate treatment steps and simplifying the overall manufacturing process.
Solution Approach 2:
The patent optimizes synthesis parameters including sintering temperature (900-1100°C), fluorine content (0.1-10 wt%), and atmosphere control to achieve complete hydroxyl group substitution. These parameter specifications provide clear manufacturing guidelines that balance product quality with process simplicity, making the synthesis route industrially viable.
3Power
If high current is applied to achieve high power output, then battery performance improves, but decomposition of electrolytic solution occurs due to hydroxyl groups
Solution Approach 1:
The patent applies preliminary anti-action by pre-substituting hydroxyl groups with fluorine before the battery enters service. This preventive measure eliminates the source of electrolyte decomposition before high-current operation begins, allowing the battery to safely deliver high power without suffering from hydroxyl-induced electrolyte breakdown. The fluorine substitution creates a stable surface that resists electrochemical degradation under high current stress.
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 substitution of hydroxyl groups with fluorine enhances the battery's high-current performance and charge/discharge cycle efficiency by preventing the formation of high-resistance coatings and maintaining electrical capacity.
Implementation Method 1
Incorporating fluorine into the monoclinic β-type titanium composite oxide to substitute hydroxyl groups
Implementation Method 2
reducing reactivity with electrolytic solutions and improving high-current properties and charge/discharge cycle performance by forming a surface layer with high fluorine content
Data Source
AI summary
According to one embodiment, there is provided an active material for a battery. The active material comprises a monoclinic β-type titanium composite oxide which contains fluorine.