Pressed Lithium Titanate Reference Electrode for Li-Ion Cell Aging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional lithium-ion cells with reference electrodes made of lithium metal have poor long-term stability and are not suitable for reliable impedance spectroscopic measurements, while alternative materials like lithium iron phosphate and lithium titanium oxide present manufacturing complexities.
Innovation Solution
A lithium-ion cell with a reference electrode made from lithium titanate powder, pressed onto the separator using a press stamp, ensuring robustness and ease of integration for long-term impedance spectroscopy and aging state determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lithium iron phosphate or lithium titanium oxide is used for reference electrode, then stability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent selects lithium titanate as the reference electrode material, optimizing the material parameters to achieve both stability and manufacturing feasibility, resolving the contradiction between material performance and manufacturing complexity
Solution Approach 2:
The patent employs a cost-effective approach by using lithium titanate powder that can be processed through relatively simple manufacturing methods, balancing material performance with manufacturing simplicity and cost-effectiveness
2Ease of manufacture
If reference electrode is pressed from lithium titanate powder, then manufacturing simplicity is improved, but electrode density may deteriorate
Solution Approach 1:
The patent optimizes the compression parameters and powder characteristics of lithium titanate to achieve appropriate electrode density through the pressing process, balancing manufacturing simplicity with sufficient electrode performance
Solution Approach 2:
The patent uses a simple pressing process from powder form, which is cost-effective and easy to manufacture, accepting that the electrode may not achieve maximum theoretical density but is sufficient for the reference electrode function
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 lithium titanate reference electrode provides a long service life and reliable impedance spectroscopic measurements, enhancing the cell's overall performance and cost-effectiveness.
Implementation Method 1
the separator positioned between the anode and cathode allows lithium ions to migrate freely through the electrolyte between the two electrodes
Implementation Method 2
the reference electrode is pressed from lithium titanate powder
Data Source
Figure 1A~3
AI summary
The invention relates to a lithium-ion cell (1) for an energy storage unit of a motor vehicle, having at least one anode (3), at least one cathode (4), an electrolyte and a separator (7) arranged between the cathode (4) and the anode (3) in the electrolyte, and having a reference electrode (8) for determining a voltage potential of the lithium-ion cell (1). The reference electrode (8) is produced from lithium titanate.