Titanium-Oxide Electrode Group Layout for Fast-Charging Cycle Life
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Solution Overview
Problem
Nonaqueous electrolyte batteries face challenges in achieving high energy density and long cycle life, particularly when using titanium-containing composite oxides like monoclinic niobium titanium composite oxide and orthorhombic titanium-containing composite oxide, as they tend to have inferior cycle life compared to spinel-type lithium titanate, and require optimization for improved heat dissipation and rapid charging performance, especially in low-temperature environments.
Innovation Solution
The electrode group is designed with a specific ratio of area (A) to thickness (B) between 6500 and 18500, incorporating a negative electrode active material-containing layer with titanium-containing composite oxides, which enhances heat dissipation and suppresses resistance increases, enabling improved cycle life and rapid charging performance in low-temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If titanium-containing composite oxide is used as negative electrode active material, then battery capacity and energy density are improved, but cycle life deteriorates compared to spinel-type lithium titanate
Solution Approach 1:
The patent optimizes the A/B ratio parameter of the electrode group to be 6500≤A/B≤18500, where A is the area of the negative electrode active material-containing layer and B is the thickness of the electrode group. This parameter optimization resolves the contradiction by achieving both high battery capacity and long cycle life with titanium-containing composite oxide, eliminating the need for spinel-type lithium titanate while maintaining excellent cycle characteristics.
2Quantity of substance
If electrode active material filling density is increased to improve energy density, then energy density is improved, but heat dissipation capability deteriorates
Solution Approach 1:
The patent optimizes the A/B ratio parameter to balance energy density and heat dissipation. By controlling the relationship between the area of the negative electrode active material-containing layer (A) and the thickness of the electrode group (B) within the range 6500≤A/B≤18500, the invention achieves high energy density while maintaining excellent heat dissipation capability, preventing thermal runaway and improving safety.
3Quantity of substance
If electrode thickness is increased to maintain battery capacity, then battery capacity is maintained, but rapid charging performance deteriorates
Solution Approach 1:
The patent optimizes the A/B ratio parameter to enable rapid charging while maintaining battery capacity. By controlling the area (A) and thickness (B) relationship within 6500≤A/B≤18500, the invention achieves both high capacity and excellent rapid charging performance, with the electrode group thickness optimized to facilitate ion transport speed during fast charging.
4Speed
If electrode group thickness is reduced to improve rapid charging performance, then rapid charging performance is improved, but battery capacity deteriorates
Solution Approach 1:
The patent optimizes the A/B ratio parameter to balance rapid charging performance and battery capacity. By controlling the relationship between the area of the negative electrode active material-containing layer (A) and the thickness of the electrode group (B) within the range 6500≤A/B≤18500, the invention achieves both fast charging speed and high battery capacity, avoiding the trade-off between these two parameters.
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 optimized electrode group effectively suppresses heat generation, enhances heat dissipation, and maintains low resistance, thereby achieving excellent cycle life and rapid charging performance in low-temperature environments, while maintaining sufficient battery capacity.
Implementation Method 1
a negative electrode including a negative electrode active material-containing layer... the negative electrode active material-containing layer contains at least one titanium-containing composite oxide
Implementation Method 2
The electrode group... effectively suppresses heat generation, enhances heat dissipation... improving heat dissipation and rapid charging performance
Data Source
AI summary
According to one embodiment, an electrode group is provided. The electrode group includes a positive electrode active material-containing layer and a negative electrode active material-containing layer. The negative electrode active material-containing layer contains at least one titanium-containing composite oxide selected from the group consisting of a monoclinic niobium titanium composite oxide and an orthorhombic titanium-containing composite oxide. The electrode group satisfies the following formula:6500≤A/B≤18500,where A is an area [cm2] of a portion of the negative electrode active material-containing layer that faces the positive electrode active material-containing layer, and B is a thickness [cm] of the electrode group.