Coated Carbon Nanotube Electrode for Stable Battery Resistance
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Solution Overview
Problem
Conventional secondary batteries, such as lithium ion batteries, face challenges in achieving optimal resistance characteristics, with existing carbon nanotube-based solutions providing only a limited reduction in resistance and susceptibility to increased resistance after high-temperature storage.
Innovation Solution
The electrode configuration includes a collector with an active material layer containing carbon nanotubes, where at least a part of the carbon nanotube surface is coated with an element of lower electronegativity than carbon, such as Ti, P, B, Si, Al, or W, to enhance electron conductivity and durability, with specific dimensions and coating ratios optimizing resistance characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbon nanotubes are used as conductive material in the active material layer, then electron conductivity is improved, but resistance characteristics are insufficient and resistance increases after high-temperature storage
Solution Approach 1:
The patent uses a composite material structure where carbon nanotubes are coated with a material containing elements of lower electronegativity (such as Li, Na, K, Ca, Sr, Ba, or their oxides). This composite structure combines the high electron conductivity of carbon nanotubes with the protective and stabilizing properties of the coating material, achieving both improved initial resistance characteristics and enhanced stability after high-temperature storage.
Solution Approach 2:
The patent changes the chemical composition parameter of the carbon nanotube surface by coating it with materials containing elements of lower electronegativity. This parameter change modifies the surface properties of the carbon nanotubes, improving their compatibility with the active material and electrolyte, thereby stabilizing resistance characteristics after high-temperature storage while maintaining electron conductivity.
2Reliability
If the surface of carbon nanotube is coated with material including element of lower electronegativity, then initial resistance is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent modifies the surface composition of carbon nanotubes by coating with materials containing elements of lower electronegativity, which changes the electrical and chemical properties of the nanotube surface. This parameter change reduces initial resistance by improving electron transport at the interface between conductive material and active material, while the coating process can be integrated into existing manufacturing workflows.
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
This configuration results in an electrode with significantly reduced initial resistance and minimal increase in resistance after high-temperature storage, leading to improved durability and performance in secondary batteries.
Implementation Method 1
at least a part of a surface of the carbon nanotube is coated with a material including an element with a lower electronegativity than that of carbon
Implementation Method 2
suppressed in an increase in resistance after high-temperature storage
Data Source
AI summary
An electrode using a carbon nanotube as a conductive material, and excellent in resistance characteristics is provided. An electrode for a secondary battery herein disclosed has a collector, and an active material layer formed on the collector. The active material layer includes an active material and a carbon nanotube. At least a part of the surface of the carbon nanotube is coated with a material including an element with a lower electronegativity than that of carbon.