Lithium Battery Anode Pore Resistance for Fast Charging Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lithium secondary batteries face reduced initial charge/discharge efficiency, high-rate characteristics, and life-span characteristics due to increased pore resistance and decreased pore structure in the anode electrode slurry.
Innovation Solution
An anode for lithium secondary batteries is designed with an anode current collector and an anode active material layer that satisfies specific pore resistance to density ratios, optimizing the pore structure for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the density of the anode electrode slurry is increased to increase energy density, then the energy density is improved, but the pore structure becomes complicated and the number of pores for lithium ion movement decreases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the density of the anode electrode slurry within a specific range (2.8-3.2 g/mL) and the content of porous particles (5-20 wt%). By optimizing these parameters, the invention achieves a balance between energy density and pore structure, ensuring sufficient pores for lithium ion movement while maintaining high energy density.
Solution Approach 2:
The patent utilizes porous materials by incorporating porous particles (such as porous carbon or metal oxides) into the anode electrode slurry. These porous particles create additional pathways for lithium ion movement, maintaining good ion transport properties even when the overall slurry density is increased, thus resolving the contradiction between energy density and charge/discharge efficiency.
2Quantity of substance
If the density of the anode electrode slurry is increased, then the energy density is improved, but the high rate characteristics and life-span characteristics are reduced
Solution Approach 1:
The patent applies parameter changes by optimizing the slurry density (2.8-3.2 g/mL) and porous particle content (5-20 wt%) to achieve a balanced electrode structure. This optimized structure ensures sufficient孔隙度 for long-term lithium ion diffusion, improving life-span characteristics while maintaining high energy density.
Solution Approach 2:
The inclusion of porous particles creates a hierarchical pore structure that facilitates lithium ion transport over extended periods. The porous network provides multiple diffusion pathways, reducing ion transport resistance during long-term cycling and thereby improving life-span characteristics without sacrificing energy density.
3Quantity of substance
If the pore structure becomes complicated due to increased slurry density, then the energy density is improved, but the number of pores for lithium ion movement decreases
Solution Approach 1:
The patent introduces porous particles with controlled pore sizes and distributions into the electrode slurry. These porous materials create additional, well-defined pathways for lithium ion movement, ensuring that even at high slurry densities, sufficient open pores remain for efficient ion transport, thus maintaining high lithium ion movement speed.
Solution Approach 2:
The patent optimizes the pore structure by controlling the size distribution, shape, and content of porous particles. By adjusting these parameters, the invention creates an optimized pore network that facilitates rapid lithium ion diffusion while maintaining high energy density, resolving the contradiction between pore complexity and ion movement speed.
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 anode active material layer enhances the life-span characteristics and electrical properties of lithium secondary batteries, ensuring high-capacity characteristics and stability during high-speed charging.
Implementation Method 1
an anode made of a carbon material etc. capable of intercalating and deintercalating lithium ions
Data Source
AI summary
An anode for a lithium secondary battery according to exemplary embodiments may include an anode current collector and an active material layer formed on at least one surface of the anode current collector and having a value of pore resistance to density within a predetermined range. Accordingly, it is possible to secure both high-capacity characteristics and high speed charging stability, thus to further improve capacity and efficiency of the lithium secondary battery.