Positive Electrode CNT Composition for Battery Fusing Reliability
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Solution Overview
Problem
The use of carbon nanotubes (CNTs) as conductive materials in positive electrodes of batteries improves output and high-rate properties but reduces electrode fusing/disconnection properties due to decreased composite material layer resistance, necessitating a balance between conductivity and structural integrity.
Innovation Solution
A positive electrode composite material layer with a CNT content of 0.45 wt% or less and a composite material layer area resistivity of 0.10 Ω·cm² or more, combined with a high packing density and specific active material particle sizes, enhances charging/discharging efficiency and fusing/disconnection properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If CNT content is increased in the positive electrode composite material layer, then output property and high-rate property are improved, but electrode fusing/disconnection property is decreased
Solution Approach 1:
The patent applies parameter changes by precisely controlling the CNT content within 0.01-0.45 wt% and the composite material layer area resistivity within 0.03-0.10 Ω·cm². By adjusting these parameters to specific ranges, the patent achieves optimal balance between output property (improved by higher CNT content) and electrode fusing/disconnection property (maintained by limiting CNT content), thereby resolving the technical contradiction.
2Productivity
If CNT content is increased to reduce composite material layer resistance, then charging/discharging efficiency is improved, but electrode structural integrity is compromised
Solution Approach 1:
The patent resolves this contradiction by establishing specific parameter ranges: CNT content of 0.01-0.45 wt% and composite material layer area resistivity of 0.03-0.10 Ω·cm². These parameter changes enable sufficient electrical conductivity for high charging/discharging efficiency while preventing excessive CNT content that would compromise electrode structural integrity and fusing/disconnection properties.
3Quantity of substance
If content of positive electrode active material is increased, then energy density is improved, but conductive material content is reduced
Solution Approach 1:
The patent applies parameter changes by precisely defining the CNT content range (0.01-0.45 wt%) and composite material layer area resistivity (0.03-0.10 Ω·cm²). This allows maximizing active material content for high energy density while ensuring sufficient conductive material content is maintained within the specified ranges, thereby resolving the contradiction between energy density and conductive material content.
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 described configuration achieves excellent charging/discharging efficiency, high initial capacity, and improved fusing/disconnection properties by optimizing CNT content and resistivity within the positive electrode composite material layer.
Implementation Method 1
an output property and a high-rate property can be improved due to high conductivity of the CNT
Data Source
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AI summary
The present disclosure provides a positive electrode (100) including a positive electrode composite material layer (20), wherein the positive electrode composite material layer (20) includes an active material particle (21) and a carbon nanotube (22), a content of the carbon nanotube (22) is 0.45 wt% or less based on 100 wt% of a total solid content of the positive electrode composite material layer (20) as a reference, and a composite material layer area resistivity of the positive electrode composite material layer (20) is 0.10 Ω·cm2 or more. According to the present disclosure, there are provided: the positive electrode (100) that is excellent in charging/discharging efficiency and that can exhibit a high capacity and a high fusing/disconnection property; and a battery (200) including the positive electrode (100).