Reduced Graphene Oxide Polymer Composite Electrode Binder
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Solution Overview
Problem
Conventional lithium secondary batteries face a reduction in capacity per unit volume due to the increased proportion of binders and conductive additives, which decreases the amount of active material in the positive electrode active material layer, thereby reducing the battery's overall performance.
Innovation Solution
The use of a reaction mixture where reduced graphene oxide and a polymer with a functional group are bonded, serving as both a conductive additive and binder, increases the proportion of active material in the positive electrode active material layer, enhancing its strength and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the mixing proportions of binder and conductive additive are increased to improve electrode strength and conductivity, then the electrode strength and conductivity are improved, but the proportion of positive electrode active material decreases, leading to reduced capacity per unit volume
Solution Approach 1:
The patent combines the functions of binder and conductive additive into a single integrated component: reduced graphene oxide. This material simultaneously provides mechanical bonding between particles and electrical conductivity pathways, eliminating the need for separate binder and conductive additive components. The merged structure allows the electrode to maintain both strength and conductivity while maximizing active material content.
Solution Approach 2:
Reduced graphene oxide serves multiple functions simultaneously: it acts as a structural binder holding particles together, provides conductive pathways for electron transport, and maintains electrode integrity during charge-discharge cycles. This multi-functional approach replaces the conventional multi-component system with a single versatile material that performs all necessary roles.
2Reliability
If the mixing proportions of binder and conductive additive are increased to improve electrode strength and conductivity, then the electrode strength and conductivity are improved, but the proportion of positive electrode active material decreases, leading to reduced capacity per unit volume
Solution Approach 1:
The patent combines the functions of binder and conductive additive into a single integrated component: reduced graphene oxide. This material simultaneously provides mechanical bonding between particles and electrical conductivity pathways, eliminating the need for separate binder and conductive additive components. The merged structure allows the electrode to maintain both strength and conductivity while maximizing active material content.
Solution Approach 2:
The use of reduced graphene oxide creates a composite structure where the carbon-based material forms a conductive network throughout the electrode. This composite approach integrates structural and conductive properties in a single material system, allowing simultaneous optimization of both mechanical integrity and electrical performance.
3Stability of the object's composition
If conventional binders and conductive additives are used separately, then the electrode structure is stable, but the capacity per unit volume of the secondary battery is reduced
Solution Approach 1:
The patent combines the functions of binder and conductive additive into a single integrated component: reduced graphene oxide. This material simultaneously provides mechanical bonding between particles and electrical conductivity pathways, eliminating the need for separate binder and conductive additive components. The merged structure allows the electrode to maintain both strength and conductivity while maximizing active 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
This approach increases the capacity per unit volume of the secondary battery by optimizing the composition of the positive electrode active material layer, leading to improved charge-discharge characteristics and increased energy density.
Implementation Method 1
a reaction mixture where reduced graphene oxide and a polymer having a functional group as a side chain are bonded to each other
Implementation Method 2
the graphene oxide and the polymer are bonded to each other. After that, the graphene oxide is reduced
Data Source
AI summary
The positive electrode active material layer includes a plurality of particles of a positive electrode active material and a reaction mixture where reduced graphene oxide is bonded to a polymer having a functional group as a side chain. The reduced graphene oxide has a sheet-like shape and high conductivity and thus functions as a conductive additive by being in contact with the plurality of particles of the positive electrode active material. The reaction mixture serves as an excellent binder since the reduced graphene oxide is bonded to the polymer. Therefore, even a small amount of the reaction mixture where the reduced graphene oxide is covalently bonded to the polymer excellently serves as a conductive additive and a binder.