CNT Electrode Powder Composition for Low-Resistivity Dispersion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing carbon nanotube (CNT) dispersions for electrodes in power storage devices suffer from aggregation, poor dispersibility, and low electrical conductivity due to insufficient dispersant content and water content, leading to instability and high transportation and storage costs.
Innovation Solution
A CNT-containing powder with a specific dispersant content (100 to 200 parts by weight) and water content (10 to 20 wt%) is formulated, ensuring excellent dispersibility and electrical conductivity, reducing volume resistivity to 61% or less, and avoiding aggregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a CNT dispersion is prepared with a dispersant and water to improve CNT dispersibility, then the CNT can be sufficiently dispersed in the electrode active material, but the dispersion requires water content control and increases transportation and storage costs
Solution Approach 1:
The patent optimizes the water content parameter to a specific range (10-20 wt%) and dispersant content ratio (100-200 parts by weight per 100 parts of CNT) to achieve the best balance between dispersibility and stability. This parameter optimization allows the CNT dispersion to maintain excellent dispersibility while minimizing water content requirements and associated transportation costs
2Stability of the object's composition
If the dispersant content is increased to prevent CNT aggregation, then the dispersibility improves, but the cost of the electrode mixture increases
Solution Approach 1:
The patent determines the optimal dispersant content ratio (100-200 parts by weight per 100 parts of CNT) through systematic parameter optimization. This optimized ratio achieves effective CNT dispersion and aggregation prevention while controlling the dispersant quantity to minimize cost increases in the electrode mixture
3Quantity of substance
If water content is reduced to lower transportation and storage costs, then the product life increases, but the CNT dispersibility deteriorates
Solution Approach 1:
The patent identifies and optimizes the water content parameter to a specific range (10-20 wt%) that achieves the optimal balance between product stability, dispersibility, and transportation cost reduction. This optimized water content level prevents CNT aggregation while minimizing the amount of water that increases transportation and storage costs
4Reliability
If a CNT-containing powder with optimized dispersant and water content is formulated, then the electrical conductivity and dispersibility improve, but the manufacturing process complexity increases
Solution Approach 1:
The patent formulates a pre-mixed CNT-containing powder with optimized dispersant (100-200 parts by weight per 100 parts of CNT) and water content (10-20 wt%) before electrode production. This preliminary formulation of the CNT dispersion with optimized parameters simplifies the overall manufacturing process by providing a ready-to-use material that ensures excellent electrical conductivity and dispersibility without requiring complex in-process adjustments
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 CNT-containing powder enhances electrode conductivity, improving discharge capacity and stability, reducing costs through longer product life and lower transportation and storage requirements.
Implementation Method 1
a CNT-containing powder for an electrode including a carbon nanotube (CNT), a dispersant, and water
Data Source
Figure 1
AI summary
To provide a CNT-containing powder for an electrode, which has an excellent action of improving electrical conductivity when used as an electrically conductive aid for an electrode of a power storage device, a composite for an electrode and an electrode mixture paste capable of obtaining an electrode having excellent electrical conductivity by using the CNT-containing powder for an electrode, and an electrode for a power storage device and a power storage device using the electrode mixture paste. A CNT-containing powder for an electrode including a carbon nanotube (CNT), a dispersant, and water, in which 100 to 200 parts by weight of the dispersant is contained with respect to 100 parts by weight of the CNT, a water content is 10 to 20 wt%, and an index value of volume resistivity is 61% or less. (Index value of volume resistivity = 100 × (volume resistivity of electrode X prepared using CNT-containing powder for electrode)/(volume resistivity of electrode Y prepared using powder obtained by drying CNT-containing powder for electrode to water content of less than 1 wt%))