Resin-Remaining Partially Exfoliated Graphite Electrode Material
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Solution Overview
Problem
Conventional capacitor electrode materials require conductive aids, which reduce the active material volume and result in insufficient capacitance in electrochemical capacitors.
Innovation Solution
A capacitor electrode material comprising resin-remaining partially exfoliated graphite, obtained by pyrolyzing a resin fixed to graphite, which eliminates the need for conductive aids and enhances capacitance, using a binder resin and specific surface area characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If doped carbon material is used as active material, then capacitance is increased, but conductive aid must be added which reduces active material volume
Solution Approach 1:
The invention merges the functions of the active material and conductive aid into a single material system. The doped carbon material serves both as the active material for capacitance and as the conductive network, eliminating the need for separate conductive aids like carbon black or acetylene black that would otherwise occupy volume.
Solution Approach 2:
The doped carbon material performs multiple functions simultaneously: it provides the active material function for ion adsorption and capacitance, while also providing the conductive function through its doped structure. This multi-functionality eliminates the need for additional conductive additives, maximizing the volume available for active material.
2Reliability
If conductive aid is added to doped carbon material, then conductivity is improved, but electrode volume increases and active material proportion decreases
Solution Approach 1:
The invention extracts the conductive aid component from the electrode composition, relying solely on the doped carbon material to provide both active material and conductive functions. This removal of unnecessary components reduces electrode volume while maintaining conductivity through the intrinsic properties of the doped carbon structure.
3Area of stationary object
If graphite is fully exfoliated, then specific surface area is increased, but structural stability decreases and production difficulty increases
Solution Approach 1:
The invention applies local quality by creating partially exfoliated graphite where only certain regions undergo exfoliation while other regions maintain the intact graphite structure. This results in a heterogeneous structure with both high-surface-area exfoliated regions and stable intact regions, balancing surface area and structural stability.
Solution Approach 2:
The invention applies partial action by performing exfoliation to a controlled extent rather than complete exfoliation. The graphite is exfoliated sufficiently to increase specific surface area for capacitance, but not so much that structural stability is compromised or production becomes excessively difficult.
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 solution allows for a significant increase in capacitance without the need for conductive aids, improving the performance of electric double layer capacitors by utilizing the increased specific surface area and dispersibility of the resin-remaining partially exfoliated graphite.
Implementation Method 1
a composition in which the resin is fixed to graphite or primary exfoliated graphite by grafting or adsorption
Implementation Method 2
a composition in which the resin is fixed to graphite or primary exfoliated graphite by grafting or adsorption
Implementation Method 3
pyrolyzing a resin in a composition in which the resin is fixed to graphite or primary exfoliated graphite by grafting or adsorption to obtain resin-remaining partially exfoliated graphite
Implementation Method 4
an amount of methylene blue adsorbed per g of the resin-remaining partially exfoliated graphite
Data Source
AI summary
There is provided a capacitor electrode material that does not require the use of a conductive aid and can increase the capacitance of an electric double layer capacitor. A capacitor electrode material comprising resin-remaining partially exfoliated graphite obtained by pyrolyzing a resin in a composition in which the resin is fixed to graphite or primary exfoliated graphite by grafting or adsorption, the resin-remaining partially exfoliated graphite having a structure in which graphite is partially exfoliated, with part of the resin remaining; and a binder resin.