SWCNT Cathode Composition for High-Drain Alkaline Cells

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Solution Overview

Problem

Existing alkaline electrochemical cells face challenges in achieving high drain discharge performance without compromising the overall capacity due to the trade-off between using conductive carbon to enhance conductivity and reducing the amount of active material like manganese dioxide.

Innovation Solution

Incorporating single-walled carbon nanotubes (SWCNTs) and graphene as conductive carbons in the cathode of alkaline electrochemical cells, blended with manganese dioxide, to maintain or increase conductivity while minimizing the carbon content, thereby optimizing the oxide-to-carbon ratio (O:C) for improved performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If conductive carbon is added to increase cathode conductivity, then high drain discharge performance is improved, but the amount of active material (manganese dioxide) is reduced, decreasing overall battery capacity

Engineering Contradiction:

Improvehigh drain discharge performanceVSAvoidbattery capacity

Core Design Contradiction:

PowerVSQuantity of substance

Solution Approach 1:

The patent changes the form and structure of conductive carbon from conventional particles to single-walled carbon nanotubes (SWCNTs), which have superior electrical conductivity and surface area-to-volume ratio. This parameter change allows for more efficient conductivity enhancement with less carbon material, thereby preserving more active material for capacity.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite cathode structure combining manganese dioxide (active material) with single-walled carbon nanotubes (conductive material). The composite leverages the high conductivity of SWCNTs and the electrochemical activity of MnO2, achieving both improved power and maintained capacity through synergistic material combination.

Inventive Principle:

Principle #40Composite materials

2Quantity of substance

If the oxide-to-carbon ratio (O:C) is increased to maintain capacity, then battery capacity is preserved, but cathode conductivity is reduced, decreasing high drain discharge performance

Engineering Contradiction:

Improvebattery capacityVSAvoidhigh drain discharge performance

Core Design Contradiction:

Quantity of substanceVSPower

Solution Approach 1:

The patent changes the physical and chemical parameters of the carbon material by using SWCNTs instead of conventional carbon particles. The unique one-dimensional structure, high aspect ratio, and excellent electrical conductivity of SWCNTs allow for superior cathode performance at lower carbon concentrations, effectively resolving the trade-off between O:C ratio and conductivity.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If conventional carbon materials are used to enhance conductivity, then manufacturing simplicity is maintained, but the efficiency of conductivity enhancement is low, requiring more carbon and reducing capacity

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidcarbon content

Core Design Contradiction:

Ease of manufactureVSQuantity of substance

Solution Approach 1:

The patent utilizes the unique parameters of SWCNTs including their high aspect ratio, large surface area, and excellent electrical conductivity. These intrinsic parameters enable more efficient conductivity enhancement per unit mass of carbon, reducing the total carbon content needed while maintaining or improving manufacturing feasibility through established nanotube incorporation methods.

Inventive Principle:

Principle #35Parameter changes

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 use of SWCNTs and graphene in the cathode reduces cathode resistivity by up to 35% and allows for higher oxide-to-carbon ratios, enhancing the cells' high drain discharge capabilities and maintaining or increasing the cell's capacity.

Implementation Method 1

Incorporating single-walled carbon nanotubes (SWCNTs) and graphene as conductive carbons in the cathode of alkaline electrochemical cells to maintain or increase conductivity

Methodology Applied

Scientific EffectElectrical Conduction: Conduction (electrical)

Implementation Method 2

An electrochemical cell comprising such an electrode

Methodology Applied

Scientific EffectRedox Reactions: Redox Reactions

Data Source

PatentUS12531248B2Single-walled carbon nanotubes in alkaline electrochemical cell electrodes

Publication Date: 2026.01.20 ENERGIZER BRANDS LLC

AI summary

Alkaline electrochemical cells are provided, wherein a conductive carbon is included in the cell's cathode in order to decrease resistivity of the cathode, so as to improve the discharge of the cell, particularly in high drain applications. The conductive carbon may comprise carbon nanotubes and/or graphene. Methods for preparing such cells are also provided.